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2305 lines
57 KiB
C
2305 lines
57 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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/*
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* This file contains support for the POSIX 1003.1B AIO/LIO facility.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/eventhandler.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/kthread.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/unistd.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/signalvar.h>
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#include <sys/protosw.h>
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#include <sys/socketvar.h>
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#include <sys/syscall.h>
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#include <sys/sysent.h>
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#include <sys/sysctl.h>
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#include <sys/sx.h>
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#include <sys/vnode.h>
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#include <sys/conf.h>
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#include <sys/event.h>
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#include <posix4/posix4.h>
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#include <vm/vm.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 <vm/uma.h>
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#include <sys/aio.h>
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#include "opt_vfs_aio.h"
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/*
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* Counter for allocating reference ids to new jobs. Wrapped to 1 on
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* overflow.
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*/
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static long jobrefid;
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#define JOBST_NULL 0x0
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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 JOBST_JOBQBUF 0x5
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#define JOBST_JOBBFINISHED 0x6
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#ifndef MAX_AIO_PER_PROC
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#define MAX_AIO_PER_PROC 32
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#endif
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#ifndef MAX_AIO_QUEUE_PER_PROC
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#define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */
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#endif
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#ifndef MAX_AIO_PROCS
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#define MAX_AIO_PROCS 32
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#endif
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#ifndef MAX_AIO_QUEUE
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#define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */
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#endif
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#ifndef TARGET_AIO_PROCS
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#define TARGET_AIO_PROCS 4
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#endif
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#ifndef MAX_BUF_AIO
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#define MAX_BUF_AIO 16
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#endif
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#ifndef AIOD_TIMEOUT_DEFAULT
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#define AIOD_TIMEOUT_DEFAULT (10 * hz)
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#endif
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#ifndef AIOD_LIFETIME_DEFAULT
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#define AIOD_LIFETIME_DEFAULT (30 * hz)
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#endif
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SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management");
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static int max_aio_procs = MAX_AIO_PROCS;
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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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"Maximum number of kernel threads to use for handling async IO ");
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static int num_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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"Number of presently active kernel threads for async IO");
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/*
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* The code will adjust the actual number of AIO processes towards this
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* number when it gets a chance.
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*/
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static int target_aio_procs = TARGET_AIO_PROCS;
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SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs,
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0, "Preferred number of ready kernel threads for async IO");
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static int max_queue_count = MAX_AIO_QUEUE;
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SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0,
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"Maximum number of aio requests to queue, globally");
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static int num_queue_count = 0;
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SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0,
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"Number of queued aio requests");
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static int num_buf_aio = 0;
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SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
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"Number of aio requests presently handled by the buf subsystem");
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/* Number of async I/O thread in the process of being started */
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/* XXX This should be local to _aio_aqueue() */
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static int num_aio_resv_start = 0;
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static int aiod_timeout;
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SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0,
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"Timeout value for synchronous aio operations");
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static int aiod_lifetime;
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SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0,
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"Maximum lifetime for idle aiod");
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static int unloadable = 0;
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SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0,
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"Allow unload of aio (not recommended)");
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static int max_aio_per_proc = MAX_AIO_PER_PROC;
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SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
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0, "Maximum active aio requests per process (stored in the process)");
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static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
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SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
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&max_aio_queue_per_proc, 0,
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"Maximum queued aio requests per process (stored in the process)");
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static int max_buf_aio = MAX_BUF_AIO;
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SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
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"Maximum buf aio requests per process (stored in the process)");
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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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int inputcharge;
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int outputcharge;
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struct callout_handle timeouthandle;
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struct buf *bp; /* Buffer pointer */
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struct proc *userproc; /* User process */ /* Not td! */
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struct ucred *cred; /* Active credential when created */
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struct file *fd_file; /* Pointer to file structure */
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struct aio_liojob *lio; /* Optional lio job */
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struct aiocb *uuaiocb; /* Pointer in userspace of aiocb */
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struct klist klist; /* list of knotes */
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struct aiocb uaiocb; /* Kernel I/O control block */
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};
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/* jobflags */
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#define AIOCBLIST_RUNDOWN 0x4
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#define AIOCBLIST_DONE 0x10
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/*
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* AIO process info
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*/
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#define AIOP_FREE 0x1 /* proc on free queue */
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#define AIOP_SCHED 0x2 /* proc explicitly scheduled */
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struct aiothreadlist {
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int aiothreadflags; /* AIO proc flags */
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TAILQ_ENTRY(aiothreadlist) list; /* List of processes */
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struct thread *aiothread; /* The AIO thread */
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};
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/*
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* data-structure for lio signal management
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*/
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struct aio_liojob {
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int lioj_flags;
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int lioj_buffer_count;
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int lioj_buffer_finished_count;
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int lioj_queue_count;
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int lioj_queue_finished_count;
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struct sigevent lioj_signal; /* signal on all I/O done */
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TAILQ_ENTRY(aio_liojob) lioj_list;
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struct kaioinfo *lioj_ki;
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};
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#define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */
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#define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */
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/*
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* per process aio data structure
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*/
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struct kaioinfo {
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int kaio_flags; /* per process kaio flags */
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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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int kaio_ballowed_count; /* maximum number of buffers */
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int kaio_queue_finished_count; /* number of daemon jobs finished */
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int kaio_buffer_count; /* number of physio buffers */
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int kaio_buffer_finished_count; /* count of I/O done */
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struct proc *kaio_p; /* process that uses this kaio block */
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TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */
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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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TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */
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TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */
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TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */
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};
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#define KAIO_RUNDOWN 0x1 /* process is being run down */
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#define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */
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static TAILQ_HEAD(,aiothreadlist) aio_activeproc; /* Active daemons */
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static TAILQ_HEAD(,aiothreadlist) aio_freeproc; /* Idle daemons */
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static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */
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static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */
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static void aio_init_aioinfo(struct proc *p);
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static void aio_onceonly(void);
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static int aio_free_entry(struct aiocblist *aiocbe);
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static void aio_process(struct aiocblist *aiocbe);
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static int aio_newproc(void);
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static int aio_aqueue(struct thread *td, struct aiocb *job, int type);
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static void aio_physwakeup(struct buf *bp);
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static void aio_proc_rundown(void *arg, struct proc *p);
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static int aio_fphysio(struct aiocblist *aiocbe);
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static int aio_qphysio(struct proc *p, struct aiocblist *iocb);
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static void aio_daemon(void *uproc);
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static void aio_swake_cb(struct socket *, struct sockbuf *);
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static int aio_unload(void);
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static void process_signal(void *aioj);
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static int filt_aioattach(struct knote *kn);
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static void filt_aiodetach(struct knote *kn);
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static int filt_aio(struct knote *kn, long hint);
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/*
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* Zones for:
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* kaio Per process async io info
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* aiop async io thread data
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* aiocb async io jobs
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* aiol list io job pointer - internal to aio_suspend XXX
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* aiolio list io jobs
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*/
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static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone;
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/* kqueue filters for aio */
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static struct filterops aio_filtops =
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{ 0, filt_aioattach, filt_aiodetach, filt_aio };
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static eventhandler_tag exit_tag, exec_tag;
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/*
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* Main operations function for use as a kernel module.
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*/
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static int
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aio_modload(struct module *module, int cmd, void *arg)
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{
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int error = 0;
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switch (cmd) {
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case MOD_LOAD:
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aio_onceonly();
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break;
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case MOD_UNLOAD:
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error = aio_unload();
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break;
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case MOD_SHUTDOWN:
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break;
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default:
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error = EINVAL;
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break;
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}
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return (error);
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}
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static moduledata_t aio_mod = {
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"aio",
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&aio_modload,
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NULL
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};
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SYSCALL_MODULE_HELPER(aio_return);
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SYSCALL_MODULE_HELPER(aio_suspend);
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SYSCALL_MODULE_HELPER(aio_cancel);
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SYSCALL_MODULE_HELPER(aio_error);
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SYSCALL_MODULE_HELPER(aio_read);
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SYSCALL_MODULE_HELPER(aio_write);
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SYSCALL_MODULE_HELPER(aio_waitcomplete);
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SYSCALL_MODULE_HELPER(lio_listio);
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DECLARE_MODULE(aio, aio_mod,
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SI_SUB_VFS, SI_ORDER_ANY);
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MODULE_VERSION(aio, 1);
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/*
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* Startup initialization
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*/
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static void
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aio_onceonly(void)
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{
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/* XXX: should probably just use so->callback */
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aio_swake = &aio_swake_cb;
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exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL,
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EVENTHANDLER_PRI_ANY);
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exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown, NULL,
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EVENTHANDLER_PRI_ANY);
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kqueue_add_filteropts(EVFILT_AIO, &aio_filtops);
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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_bufjobs);
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kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL,
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NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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aiop_zone = uma_zcreate("AIOP", sizeof(struct aiothreadlist), NULL,
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NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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aiocb_zone = uma_zcreate("AIOCB", sizeof(struct aiocblist), NULL, NULL,
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NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL,
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NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aio_liojob), NULL,
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NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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aiod_timeout = AIOD_TIMEOUT_DEFAULT;
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aiod_lifetime = AIOD_LIFETIME_DEFAULT;
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jobrefid = 1;
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async_io_version = _POSIX_VERSION;
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p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX);
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p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE);
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p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0);
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}
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/*
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* Callback for unload of AIO when used as a module.
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*/
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static int
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aio_unload(void)
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{
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/*
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* XXX: no unloads by default, it's too dangerous.
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* perhaps we could do it if locked out callers and then
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* did an aio_proc_rundown() on each process.
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*/
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if (!unloadable)
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return (EOPNOTSUPP);
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async_io_version = 0;
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aio_swake = NULL;
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EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
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EVENTHANDLER_DEREGISTER(process_exec, exec_tag);
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kqueue_del_filteropts(EVFILT_AIO);
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p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, -1);
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p31b_setcfg(CTL_P1003_1B_AIO_MAX, -1);
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p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, -1);
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return (0);
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}
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/*
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* Init the per-process aioinfo structure. The aioinfo limits are set
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* per-process for user limit (resource) management.
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*/
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static void
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aio_init_aioinfo(struct proc *p)
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{
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struct kaioinfo *ki;
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if (p->p_aioinfo == NULL) {
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ki = uma_zalloc(kaio_zone, M_WAITOK);
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p->p_aioinfo = ki;
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ki->kaio_flags = 0;
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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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ki->kaio_ballowed_count = max_buf_aio;
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ki->kaio_buffer_count = 0;
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ki->kaio_buffer_finished_count = 0;
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ki->kaio_p = p;
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TAILQ_INIT(&ki->kaio_jobdone);
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TAILQ_INIT(&ki->kaio_jobqueue);
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TAILQ_INIT(&ki->kaio_bufdone);
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TAILQ_INIT(&ki->kaio_bufqueue);
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TAILQ_INIT(&ki->kaio_liojoblist);
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TAILQ_INIT(&ki->kaio_sockqueue);
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}
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while (num_aio_procs < target_aio_procs)
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aio_newproc();
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}
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/*
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* Free a job entry. Wait for completion if it is currently active, but don't
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* delay forever. If we delay, we return a flag that says that we have to
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* restart the queue scan.
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*/
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static int
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aio_free_entry(struct aiocblist *aiocbe)
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{
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struct kaioinfo *ki;
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struct aio_liojob *lj;
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struct proc *p;
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int error;
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int s;
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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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lj = aiocbe->lio;
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if (ki == NULL)
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panic("aio_free_entry: missing p->p_aioinfo");
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|
|
while (aiocbe->jobstate == JOBST_JOBRUNNING) {
|
|
aiocbe->jobflags |= AIOCBLIST_RUNDOWN;
|
|
tsleep(aiocbe, PRIBIO, "jobwai", 0);
|
|
}
|
|
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--;
|
|
}
|
|
|
|
/* aiocbe is going away, we need to destroy any knotes */
|
|
/* XXXKSE Note the thread here is used to eventually find the
|
|
* owning process again, but it is also used to do a fo_close
|
|
* and that requires the thread. (but does it require the
|
|
* OWNING thread? (or maybe the running thread?)
|
|
* There is a semantic problem here...
|
|
*/
|
|
knote_remove(FIRST_THREAD_IN_PROC(p), &aiocbe->klist); /* XXXKSE */
|
|
|
|
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(aiocbe)) != 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_JOBQGLOBAL) {
|
|
s = splnet();
|
|
TAILQ_REMOVE(&aio_jobs, aiocbe, list);
|
|
TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
|
|
splx(s);
|
|
} 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);
|
|
uma_zfree(aiolio_zone, lj);
|
|
}
|
|
aiocbe->jobstate = JOBST_NULL;
|
|
untimeout(process_signal, aiocbe, aiocbe->timeouthandle);
|
|
fdrop(aiocbe->fd_file, curthread);
|
|
crfree(aiocbe->cred);
|
|
uma_zfree(aiocb_zone, aiocbe);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Rundown the jobs for a given process.
|
|
*/
|
|
static void
|
|
aio_proc_rundown(void *arg, struct proc *p)
|
|
{
|
|
int s;
|
|
struct kaioinfo *ki;
|
|
struct aio_liojob *lj, *ljn;
|
|
struct aiocblist *aiocbe, *aiocbn;
|
|
struct file *fp;
|
|
struct socket *so;
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Move any aio ops that are waiting on socket I/O to the normal job
|
|
* queues so they are cleaned up with any others.
|
|
*/
|
|
s = splnet();
|
|
for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe =
|
|
aiocbn) {
|
|
aiocbn = TAILQ_NEXT(aiocbe, plist);
|
|
fp = aiocbe->fd_file;
|
|
if (fp != NULL) {
|
|
so = fp->f_data;
|
|
TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list);
|
|
if (TAILQ_EMPTY(&so->so_aiojobq)) {
|
|
so->so_snd.sb_flags &= ~SB_AIO;
|
|
so->so_rcv.sb_flags &= ~SB_AIO;
|
|
}
|
|
}
|
|
TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist);
|
|
TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list);
|
|
TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist);
|
|
}
|
|
splx(s);
|
|
|
|
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);
|
|
|
|
/*
|
|
* If we've slept, jobs might have moved from one queue to another.
|
|
* Retry rundown if we didn't manage to empty the queues.
|
|
*/
|
|
if (TAILQ_FIRST(&ki->kaio_jobdone) != NULL ||
|
|
TAILQ_FIRST(&ki->kaio_jobqueue) != NULL ||
|
|
TAILQ_FIRST(&ki->kaio_bufqueue) != NULL ||
|
|
TAILQ_FIRST(&ki->kaio_bufdone) != NULL)
|
|
goto restart1;
|
|
|
|
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);
|
|
uma_zfree(aiolio_zone, lj);
|
|
} else {
|
|
#ifdef 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
|
|
}
|
|
}
|
|
|
|
uma_zfree(kaio_zone, ki);
|
|
p->p_aioinfo = NULL;
|
|
}
|
|
|
|
/*
|
|
* Select a job to run (called by an AIO daemon).
|
|
*/
|
|
static struct aiocblist *
|
|
aio_selectjob(struct aiothreadlist *aiop)
|
|
{
|
|
int s;
|
|
struct aiocblist *aiocbe;
|
|
struct kaioinfo *ki;
|
|
struct proc *userp;
|
|
|
|
s = splnet();
|
|
for (aiocbe = TAILQ_FIRST(&aio_jobs); aiocbe; aiocbe =
|
|
TAILQ_NEXT(aiocbe, list)) {
|
|
userp = aiocbe->userproc;
|
|
ki = userp->p_aioinfo;
|
|
|
|
if (ki->kaio_active_count < ki->kaio_maxactive_count) {
|
|
TAILQ_REMOVE(&aio_jobs, aiocbe, list);
|
|
splx(s);
|
|
return (aiocbe);
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
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.
|
|
*/
|
|
static void
|
|
aio_process(struct aiocblist *aiocbe)
|
|
{
|
|
struct ucred *td_savedcred;
|
|
struct thread *td;
|
|
struct proc *mycp;
|
|
struct aiocb *cb;
|
|
struct file *fp;
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
int cnt;
|
|
int error;
|
|
int oublock_st, oublock_end;
|
|
int inblock_st, inblock_end;
|
|
|
|
td = curthread;
|
|
td_savedcred = td->td_ucred;
|
|
td->td_ucred = aiocbe->cred;
|
|
mycp = td->td_proc;
|
|
cb = &aiocbe->uaiocb;
|
|
fp = aiocbe->fd_file;
|
|
|
|
aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
|
|
aiov.iov_len = cb->aio_nbytes;
|
|
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_offset = cb->aio_offset;
|
|
auio.uio_resid = cb->aio_nbytes;
|
|
cnt = cb->aio_nbytes;
|
|
auio.uio_segflg = UIO_USERSPACE;
|
|
auio.uio_td = td;
|
|
|
|
inblock_st = mycp->p_stats->p_ru.ru_inblock;
|
|
oublock_st = mycp->p_stats->p_ru.ru_oublock;
|
|
/*
|
|
* _aio_aqueue() acquires a reference to the file that is
|
|
* released in aio_free_entry().
|
|
*/
|
|
if (cb->aio_lio_opcode == LIO_READ) {
|
|
auio.uio_rw = UIO_READ;
|
|
error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td);
|
|
} else {
|
|
auio.uio_rw = UIO_WRITE;
|
|
error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td);
|
|
}
|
|
inblock_end = mycp->p_stats->p_ru.ru_inblock;
|
|
oublock_end = mycp->p_stats->p_ru.ru_oublock;
|
|
|
|
aiocbe->inputcharge = inblock_end - inblock_st;
|
|
aiocbe->outputcharge = oublock_end - oublock_st;
|
|
|
|
if ((error) && (auio.uio_resid != cnt)) {
|
|
if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
|
|
error = 0;
|
|
if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) {
|
|
PROC_LOCK(aiocbe->userproc);
|
|
psignal(aiocbe->userproc, SIGPIPE);
|
|
PROC_UNLOCK(aiocbe->userproc);
|
|
}
|
|
}
|
|
|
|
cnt -= auio.uio_resid;
|
|
cb->_aiocb_private.error = error;
|
|
cb->_aiocb_private.status = cnt;
|
|
td->td_ucred = td_savedcred;
|
|
}
|
|
|
|
/*
|
|
* 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 aio_liojob *lj;
|
|
struct aiocb *cb;
|
|
struct aiocblist *aiocbe;
|
|
struct aiothreadlist *aiop;
|
|
struct kaioinfo *ki;
|
|
struct proc *curcp, *mycp, *userp;
|
|
struct vmspace *myvm, *tmpvm;
|
|
struct thread *td = curthread;
|
|
struct pgrp *newpgrp;
|
|
struct session *newsess;
|
|
|
|
mtx_lock(&Giant);
|
|
/*
|
|
* Local copies of curproc (cp) and vmspace (myvm)
|
|
*/
|
|
mycp = td->td_proc;
|
|
myvm = mycp->p_vmspace;
|
|
|
|
KASSERT(mycp->p_textvp == NULL, ("kthread has a textvp"));
|
|
|
|
/*
|
|
* Allocate and ready the aio control info. There is one aiop structure
|
|
* per daemon.
|
|
*/
|
|
aiop = uma_zalloc(aiop_zone, M_WAITOK);
|
|
aiop->aiothread = td;
|
|
aiop->aiothreadflags |= AIOP_FREE;
|
|
|
|
s = splnet();
|
|
|
|
/*
|
|
* 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);
|
|
|
|
splx(s);
|
|
|
|
/*
|
|
* Get rid of our current filedescriptors. AIOD's don't need any
|
|
* filedescriptors, except as temporarily inherited from the client.
|
|
*/
|
|
fdfree(td);
|
|
|
|
mtx_unlock(&Giant);
|
|
/* The daemon resides in its own pgrp. */
|
|
MALLOC(newpgrp, struct pgrp *, sizeof(struct pgrp), M_PGRP,
|
|
M_WAITOK | M_ZERO);
|
|
MALLOC(newsess, struct session *, sizeof(struct session), M_SESSION,
|
|
M_WAITOK | M_ZERO);
|
|
|
|
sx_xlock(&proctree_lock);
|
|
enterpgrp(mycp, mycp->p_pid, newpgrp, newsess);
|
|
sx_xunlock(&proctree_lock);
|
|
mtx_lock(&Giant);
|
|
|
|
/*
|
|
* Wakeup parent process. (Parent sleeps to keep from blasting away
|
|
* and creating too many daemons.)
|
|
*/
|
|
wakeup(mycp);
|
|
|
|
for (;;) {
|
|
/*
|
|
* curcp is the current daemon process context.
|
|
* userp is the current user process context.
|
|
*/
|
|
curcp = mycp;
|
|
|
|
/*
|
|
* Take daemon off of free queue
|
|
*/
|
|
if (aiop->aiothreadflags & AIOP_FREE) {
|
|
s = splnet();
|
|
TAILQ_REMOVE(&aio_freeproc, aiop, list);
|
|
TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
|
|
aiop->aiothreadflags &= ~AIOP_FREE;
|
|
splx(s);
|
|
}
|
|
aiop->aiothreadflags &= ~AIOP_SCHED;
|
|
|
|
/*
|
|
* Check for jobs.
|
|
*/
|
|
while ((aiocbe = aio_selectjob(aiop)) != NULL) {
|
|
cb = &aiocbe->uaiocb;
|
|
userp = aiocbe->userproc;
|
|
|
|
aiocbe->jobstate = JOBST_JOBRUNNING;
|
|
|
|
/*
|
|
* Connect to process address space for user program.
|
|
*/
|
|
if (userp != curcp) {
|
|
/*
|
|
* Save the current address space that we are
|
|
* connected to.
|
|
*/
|
|
tmpvm = mycp->p_vmspace;
|
|
|
|
/*
|
|
* Point to the new user address space, and
|
|
* refer to it.
|
|
*/
|
|
mycp->p_vmspace = userp->p_vmspace;
|
|
mycp->p_vmspace->vm_refcnt++;
|
|
|
|
/* Activate the new mapping. */
|
|
pmap_activate(FIRST_THREAD_IN_PROC(mycp));
|
|
|
|
/*
|
|
* If the old address space wasn't the daemons
|
|
* own address space, then we need to remove the
|
|
* daemon's reference from the other process
|
|
* that it was acting on behalf of.
|
|
*/
|
|
if (tmpvm != myvm) {
|
|
vmspace_free(tmpvm);
|
|
}
|
|
curcp = userp;
|
|
}
|
|
|
|
ki = userp->p_aioinfo;
|
|
lj = aiocbe->lio;
|
|
|
|
/* Account for currently active jobs. */
|
|
ki->kaio_active_count++;
|
|
|
|
/* Do the I/O function. */
|
|
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)) {
|
|
PROC_LOCK(userp);
|
|
psignal(userp,
|
|
lj->lioj_signal.sigev_signo);
|
|
PROC_UNLOCK(userp);
|
|
lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
aiocbe->jobstate = JOBST_JOBFINISHED;
|
|
|
|
s = splnet();
|
|
TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
|
|
TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist);
|
|
splx(s);
|
|
KNOTE(&aiocbe->klist, 0);
|
|
|
|
if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) {
|
|
wakeup(aiocbe);
|
|
aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
|
|
}
|
|
|
|
if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
|
|
PROC_LOCK(userp);
|
|
psignal(userp, cb->aio_sigevent.sigev_signo);
|
|
PROC_UNLOCK(userp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Disconnect from user address space.
|
|
*/
|
|
if (curcp != mycp) {
|
|
/* Get the user address space to disconnect from. */
|
|
tmpvm = mycp->p_vmspace;
|
|
|
|
/* Get original address space for daemon. */
|
|
mycp->p_vmspace = myvm;
|
|
|
|
/* Activate the daemon's address space. */
|
|
pmap_activate(FIRST_THREAD_IN_PROC(mycp));
|
|
#ifdef DIAGNOSTIC
|
|
if (tmpvm == myvm) {
|
|
printf("AIOD: vmspace problem -- %d\n",
|
|
mycp->p_pid);
|
|
}
|
|
#endif
|
|
/* Remove our vmspace reference. */
|
|
vmspace_free(tmpvm);
|
|
|
|
curcp = mycp;
|
|
}
|
|
|
|
/*
|
|
* If we are the first to be put onto the free queue, wakeup
|
|
* anyone waiting for a daemon.
|
|
*/
|
|
s = splnet();
|
|
TAILQ_REMOVE(&aio_activeproc, aiop, list);
|
|
if (TAILQ_EMPTY(&aio_freeproc))
|
|
wakeup(&aio_freeproc);
|
|
TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
|
|
aiop->aiothreadflags |= AIOP_FREE;
|
|
splx(s);
|
|
|
|
/*
|
|
* If daemon is inactive for a long time, allow it to exit,
|
|
* thereby freeing resources.
|
|
*/
|
|
if ((aiop->aiothreadflags & AIOP_SCHED) == 0 &&
|
|
tsleep(aiop->aiothread, PRIBIO, "aiordy", aiod_lifetime)) {
|
|
s = splnet();
|
|
if (TAILQ_EMPTY(&aio_jobs)) {
|
|
if ((aiop->aiothreadflags & AIOP_FREE) &&
|
|
(num_aio_procs > target_aio_procs)) {
|
|
TAILQ_REMOVE(&aio_freeproc, aiop, list);
|
|
splx(s);
|
|
uma_zfree(aiop_zone, aiop);
|
|
num_aio_procs--;
|
|
#ifdef DIAGNOSTIC
|
|
if (mycp->p_vmspace->vm_refcnt <= 1) {
|
|
printf("AIOD: bad vm refcnt for"
|
|
" exiting daemon: %d\n",
|
|
mycp->p_vmspace->vm_refcnt);
|
|
}
|
|
#endif
|
|
kthread_exit(0);
|
|
}
|
|
}
|
|
splx(s);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
|
|
* AIO daemon modifies its environment itself.
|
|
*/
|
|
static int
|
|
aio_newproc(void)
|
|
{
|
|
int error;
|
|
struct proc *p;
|
|
|
|
error = kthread_create(aio_daemon, curproc, &p, RFNOWAIT, 0, "aiod%d",
|
|
num_aio_procs);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Wait until daemon is started, but continue on just in case to
|
|
* handle error conditions.
|
|
*/
|
|
error = tsleep(p, PZERO, "aiosta", aiod_timeout);
|
|
|
|
num_aio_procs++;
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Try the high-performance, low-overhead physio method for eligible
|
|
* VCHR devices. This method doesn't use an aio helper thread, and
|
|
* thus has very low overhead.
|
|
*
|
|
* Assumes that the caller, _aio_aqueue(), has incremented the file
|
|
* structure's reference count, preventing its deallocation for the
|
|
* duration of this call.
|
|
*/
|
|
static int
|
|
aio_qphysio(struct proc *p, struct aiocblist *aiocbe)
|
|
{
|
|
int error;
|
|
struct aiocb *cb;
|
|
struct file *fp;
|
|
struct buf *bp;
|
|
struct vnode *vp;
|
|
struct kaioinfo *ki;
|
|
struct aio_liojob *lj;
|
|
int s;
|
|
int notify;
|
|
|
|
cb = &aiocbe->uaiocb;
|
|
fp = aiocbe->fd_file;
|
|
|
|
if (fp->f_type != DTYPE_VNODE)
|
|
return (-1);
|
|
|
|
vp = fp->f_vnode;
|
|
|
|
/*
|
|
* If its not a disk, we don't want to return a positive error.
|
|
* It causes the aio code to not fall through to try the thread
|
|
* way when you're talking to a regular file.
|
|
*/
|
|
if (!vn_isdisk(vp, &error)) {
|
|
if (error == ENOTBLK)
|
|
return (-1);
|
|
else
|
|
return (error);
|
|
}
|
|
|
|
if (cb->aio_nbytes % vp->v_rdev->si_bsize_phys)
|
|
return (-1);
|
|
|
|
if (cb->aio_nbytes >
|
|
MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK))
|
|
return (-1);
|
|
|
|
ki = p->p_aioinfo;
|
|
if (ki->kaio_buffer_count >= ki->kaio_ballowed_count)
|
|
return (-1);
|
|
|
|
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);
|
|
BUF_KERNPROC(bp);
|
|
|
|
/*
|
|
* Get a copy of the kva from the physical buffer.
|
|
*/
|
|
bp->b_dev = vp->v_rdev;
|
|
error = 0;
|
|
|
|
bp->b_bcount = cb->aio_nbytes;
|
|
bp->b_bufsize = cb->aio_nbytes;
|
|
bp->b_flags = B_PHYS;
|
|
bp->b_iodone = aio_physwakeup;
|
|
bp->b_saveaddr = bp->b_data;
|
|
bp->b_data = (void *)(uintptr_t)cb->aio_buf;
|
|
bp->b_offset = cb->aio_offset;
|
|
bp->b_iooffset = cb->aio_offset;
|
|
bp->b_blkno = btodb(cb->aio_offset);
|
|
bp->b_iocmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ;
|
|
|
|
/*
|
|
* Bring buffer into kernel space.
|
|
*/
|
|
if (vmapbuf(bp) < 0) {
|
|
error = EFAULT;
|
|
goto doerror;
|
|
}
|
|
|
|
s = splbio();
|
|
aiocbe->bp = bp;
|
|
bp->b_caller1 = (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++;
|
|
bp->b_error = 0;
|
|
|
|
splx(s);
|
|
|
|
/* Perform transfer. */
|
|
DEV_STRATEGY(bp);
|
|
|
|
notify = 0;
|
|
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_ioflags & BIO_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);
|
|
notify = 1;
|
|
}
|
|
}
|
|
splx(s);
|
|
if (notify)
|
|
KNOTE(&aiocbe->klist, 0);
|
|
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.
|
|
*/
|
|
static int
|
|
aio_fphysio(struct aiocblist *iocb)
|
|
{
|
|
int s;
|
|
struct buf *bp;
|
|
int error;
|
|
|
|
bp = iocb->bp;
|
|
|
|
s = splbio();
|
|
while ((bp->b_flags & B_DONE) == 0) {
|
|
if (tsleep(bp, PRIBIO, "physstr", aiod_timeout)) {
|
|
if ((bp->b_flags & B_DONE) == 0) {
|
|
splx(s);
|
|
return (EINPROGRESS);
|
|
} else
|
|
break;
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
/* Release mapping into kernel space. */
|
|
vunmapbuf(bp);
|
|
iocb->bp = 0;
|
|
|
|
error = 0;
|
|
|
|
/* Check for an error. */
|
|
if (bp->b_ioflags & BIO_ERROR)
|
|
error = bp->b_error;
|
|
|
|
relpbuf(bp, NULL);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Wake up aio requests that may be serviceable now.
|
|
*/
|
|
static void
|
|
aio_swake_cb(struct socket *so, struct sockbuf *sb)
|
|
{
|
|
struct aiocblist *cb,*cbn;
|
|
struct proc *p;
|
|
struct kaioinfo *ki = NULL;
|
|
int opcode, wakecount = 0;
|
|
struct aiothreadlist *aiop;
|
|
|
|
if (sb == &so->so_snd) {
|
|
opcode = LIO_WRITE;
|
|
so->so_snd.sb_flags &= ~SB_AIO;
|
|
} else {
|
|
opcode = LIO_READ;
|
|
so->so_rcv.sb_flags &= ~SB_AIO;
|
|
}
|
|
|
|
for (cb = TAILQ_FIRST(&so->so_aiojobq); cb; cb = cbn) {
|
|
cbn = TAILQ_NEXT(cb, list);
|
|
if (opcode == cb->uaiocb.aio_lio_opcode) {
|
|
p = cb->userproc;
|
|
ki = p->p_aioinfo;
|
|
TAILQ_REMOVE(&so->so_aiojobq, cb, list);
|
|
TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist);
|
|
TAILQ_INSERT_TAIL(&aio_jobs, cb, list);
|
|
TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist);
|
|
wakecount++;
|
|
if (cb->jobstate != JOBST_JOBQGLOBAL)
|
|
panic("invalid queue value");
|
|
}
|
|
}
|
|
|
|
while (wakecount--) {
|
|
if ((aiop = TAILQ_FIRST(&aio_freeproc)) != 0) {
|
|
TAILQ_REMOVE(&aio_freeproc, aiop, list);
|
|
TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
|
|
aiop->aiothreadflags &= ~AIOP_FREE;
|
|
wakeup(aiop->aiothread);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Queue a new AIO request. Choosing either the threaded or direct physio VCHR
|
|
* technique is done in this code.
|
|
*/
|
|
static int
|
|
_aio_aqueue(struct thread *td, struct aiocb *job, struct aio_liojob *lj, int type)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
unsigned int fd;
|
|
struct socket *so;
|
|
int s;
|
|
int error;
|
|
int opcode, user_opcode;
|
|
struct aiocblist *aiocbe;
|
|
struct aiothreadlist *aiop;
|
|
struct kaioinfo *ki;
|
|
struct kevent kev;
|
|
struct kqueue *kq;
|
|
struct file *kq_fp;
|
|
|
|
aiocbe = uma_zalloc(aiocb_zone, M_WAITOK);
|
|
aiocbe->inputcharge = 0;
|
|
aiocbe->outputcharge = 0;
|
|
callout_handle_init(&aiocbe->timeouthandle);
|
|
SLIST_INIT(&aiocbe->klist);
|
|
|
|
suword(&job->_aiocb_private.status, -1);
|
|
suword(&job->_aiocb_private.error, 0);
|
|
suword(&job->_aiocb_private.kernelinfo, -1);
|
|
|
|
error = copyin(job, &aiocbe->uaiocb, sizeof(aiocbe->uaiocb));
|
|
if (error) {
|
|
suword(&job->_aiocb_private.error, error);
|
|
uma_zfree(aiocb_zone, aiocbe);
|
|
return (error);
|
|
}
|
|
if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL &&
|
|
!_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) {
|
|
uma_zfree(aiocb_zone, aiocbe);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Save userspace address of the job info. */
|
|
aiocbe->uuaiocb = job;
|
|
|
|
/* Get the opcode. */
|
|
user_opcode = aiocbe->uaiocb.aio_lio_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.
|
|
*/
|
|
FILEDESC_LOCK(fdp);
|
|
fd = aiocbe->uaiocb.aio_fildes;
|
|
if (fd >= fdp->fd_nfiles) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
uma_zfree(aiocb_zone, aiocbe);
|
|
if (type == 0)
|
|
suword(&job->_aiocb_private.error, EBADF);
|
|
return (EBADF);
|
|
}
|
|
|
|
fp = aiocbe->fd_file = fdp->fd_ofiles[fd];
|
|
if ((fp == NULL) ||
|
|
((opcode == LIO_WRITE) && ((fp->f_flag & FWRITE) == 0)) ||
|
|
((opcode == LIO_READ) && ((fp->f_flag & FREAD) == 0))) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
uma_zfree(aiocb_zone, aiocbe);
|
|
if (type == 0)
|
|
suword(&job->_aiocb_private.error, EBADF);
|
|
return (EBADF);
|
|
}
|
|
fhold(fp);
|
|
FILEDESC_UNLOCK(fdp);
|
|
|
|
if (aiocbe->uaiocb.aio_offset == -1LL) {
|
|
error = EINVAL;
|
|
goto aqueue_fail;
|
|
}
|
|
error = suword(&job->_aiocb_private.kernelinfo, jobrefid);
|
|
if (error) {
|
|
error = EINVAL;
|
|
goto aqueue_fail;
|
|
}
|
|
aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jobrefid;
|
|
if (jobrefid == LONG_MAX)
|
|
jobrefid = 1;
|
|
else
|
|
jobrefid++;
|
|
|
|
if (opcode == LIO_NOP) {
|
|
fdrop(fp, td);
|
|
uma_zfree(aiocb_zone, aiocbe);
|
|
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)) {
|
|
if (type == 0)
|
|
suword(&job->_aiocb_private.status, 0);
|
|
error = EINVAL;
|
|
goto aqueue_fail;
|
|
}
|
|
|
|
if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) {
|
|
kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue;
|
|
kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sigval_ptr;
|
|
}
|
|
else {
|
|
/*
|
|
* This method for requesting kevent-based notification won't
|
|
* work on the alpha, since we're passing in a pointer
|
|
* via aio_lio_opcode, which is an int. Use the SIGEV_KEVENT-
|
|
* based method instead.
|
|
*/
|
|
if (user_opcode == LIO_NOP || user_opcode == LIO_READ ||
|
|
user_opcode == LIO_WRITE)
|
|
goto no_kqueue;
|
|
|
|
error = copyin((struct kevent *)(uintptr_t)user_opcode,
|
|
&kev, sizeof(kev));
|
|
if (error)
|
|
goto aqueue_fail;
|
|
}
|
|
if ((u_int)kev.ident >= fdp->fd_nfiles ||
|
|
(kq_fp = fdp->fd_ofiles[kev.ident]) == NULL ||
|
|
(kq_fp->f_type != DTYPE_KQUEUE)) {
|
|
error = EBADF;
|
|
goto aqueue_fail;
|
|
}
|
|
kq = kq_fp->f_data;
|
|
kev.ident = (uintptr_t)aiocbe->uuaiocb;
|
|
kev.filter = EVFILT_AIO;
|
|
kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
|
|
kev.data = (intptr_t)aiocbe;
|
|
error = kqueue_register(kq, &kev, td);
|
|
aqueue_fail:
|
|
if (error) {
|
|
fdrop(fp, td);
|
|
uma_zfree(aiocb_zone, aiocbe);
|
|
if (type == 0)
|
|
suword(&job->_aiocb_private.error, error);
|
|
goto done;
|
|
}
|
|
no_kqueue:
|
|
|
|
suword(&job->_aiocb_private.error, EINPROGRESS);
|
|
aiocbe->uaiocb._aiocb_private.error = EINPROGRESS;
|
|
aiocbe->userproc = p;
|
|
aiocbe->cred = crhold(td->td_ucred);
|
|
aiocbe->jobflags = 0;
|
|
aiocbe->lio = lj;
|
|
ki = p->p_aioinfo;
|
|
|
|
if (fp->f_type == DTYPE_SOCKET) {
|
|
/*
|
|
* Alternate queueing for socket ops: Reach down into the
|
|
* descriptor to get the socket data. Then check to see if the
|
|
* socket is ready to be read or written (based on the requested
|
|
* operation).
|
|
*
|
|
* If it is not ready for io, then queue the aiocbe on the
|
|
* socket, and set the flags so we get a call when sbnotify()
|
|
* happens.
|
|
*/
|
|
so = fp->f_data;
|
|
s = splnet();
|
|
if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode ==
|
|
LIO_WRITE) && (!sowriteable(so)))) {
|
|
TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list);
|
|
TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist);
|
|
if (opcode == LIO_READ)
|
|
so->so_rcv.sb_flags |= SB_AIO;
|
|
else
|
|
so->so_snd.sb_flags |= SB_AIO;
|
|
aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */
|
|
ki->kaio_queue_count++;
|
|
num_queue_count++;
|
|
splx(s);
|
|
error = 0;
|
|
goto done;
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
if ((error = aio_qphysio(p, aiocbe)) == 0)
|
|
goto done;
|
|
if (error > 0) {
|
|
suword(&job->_aiocb_private.status, 0);
|
|
aiocbe->uaiocb._aiocb_private.error = error;
|
|
suword(&job->_aiocb_private.error, error);
|
|
goto done;
|
|
}
|
|
|
|
/* No buffer for daemon I/O. */
|
|
aiocbe->bp = NULL;
|
|
|
|
ki->kaio_queue_count++;
|
|
if (lj)
|
|
lj->lioj_queue_count++;
|
|
s = splnet();
|
|
TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
|
|
TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
|
|
splx(s);
|
|
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.
|
|
*/
|
|
s = splnet();
|
|
retryproc:
|
|
if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
|
|
TAILQ_REMOVE(&aio_freeproc, aiop, list);
|
|
TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
|
|
aiop->aiothreadflags &= ~AIOP_FREE;
|
|
wakeup(aiop->aiothread);
|
|
} else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
|
|
((ki->kaio_active_count + num_aio_resv_start) <
|
|
ki->kaio_maxactive_count)) {
|
|
num_aio_resv_start++;
|
|
if ((error = aio_newproc()) == 0) {
|
|
num_aio_resv_start--;
|
|
goto retryproc;
|
|
}
|
|
num_aio_resv_start--;
|
|
}
|
|
splx(s);
|
|
done:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* This routine queues an AIO request, checking for quotas.
|
|
*/
|
|
static int
|
|
aio_aqueue(struct thread *td, struct aiocb *job, int type)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
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(td, job, NULL, type);
|
|
}
|
|
|
|
/*
|
|
* Support the aio_return system call, as a side-effect, kernel resources are
|
|
* released.
|
|
*/
|
|
int
|
|
aio_return(struct thread *td, struct aio_return_args *uap)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
int s;
|
|
long jobref;
|
|
struct aiocblist *cb, *ncb;
|
|
struct aiocb *ujob;
|
|
struct kaioinfo *ki;
|
|
|
|
ujob = uap->aiocbp;
|
|
jobref = fuword(&ujob->_aiocb_private.kernelinfo);
|
|
if (jobref == -1 || jobref == 0)
|
|
return (EINVAL);
|
|
|
|
ki = p->p_aioinfo;
|
|
if (ki == NULL)
|
|
return (EINVAL);
|
|
TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
|
|
if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) ==
|
|
jobref) {
|
|
if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
|
|
p->p_stats->p_ru.ru_oublock +=
|
|
cb->outputcharge;
|
|
cb->outputcharge = 0;
|
|
} else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
|
|
p->p_stats->p_ru.ru_inblock += cb->inputcharge;
|
|
cb->inputcharge = 0;
|
|
}
|
|
goto done;
|
|
}
|
|
}
|
|
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) {
|
|
break;
|
|
}
|
|
}
|
|
splx(s);
|
|
done:
|
|
if (cb != NULL) {
|
|
if (ujob == cb->uuaiocb) {
|
|
td->td_retval[0] =
|
|
cb->uaiocb._aiocb_private.status;
|
|
} else
|
|
td->td_retval[0] = EFAULT;
|
|
aio_free_entry(cb);
|
|
return (0);
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Allow a process to wakeup when any of the I/O requests are completed.
|
|
*/
|
|
int
|
|
aio_suspend(struct thread *td, struct aio_suspend_args *uap)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct timeval atv;
|
|
struct timespec ts;
|
|
struct aiocb *const *cbptr, *cbp;
|
|
struct kaioinfo *ki;
|
|
struct aiocblist *cb;
|
|
int i;
|
|
int njoblist;
|
|
int error, s, timo;
|
|
long *ijoblist;
|
|
struct aiocb **ujoblist;
|
|
|
|
if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX)
|
|
return (EINVAL);
|
|
|
|
timo = 0;
|
|
if (uap->timeout) {
|
|
/* Get timespec struct. */
|
|
if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
|
|
return (error);
|
|
|
|
if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
|
|
return (EINVAL);
|
|
|
|
TIMESPEC_TO_TIMEVAL(&atv, &ts);
|
|
if (itimerfix(&atv))
|
|
return (EINVAL);
|
|
timo = tvtohz(&atv);
|
|
}
|
|
|
|
ki = p->p_aioinfo;
|
|
if (ki == NULL)
|
|
return (EAGAIN);
|
|
|
|
njoblist = 0;
|
|
ijoblist = uma_zalloc(aiol_zone, M_WAITOK);
|
|
ujoblist = uma_zalloc(aiol_zone, M_WAITOK);
|
|
cbptr = uap->aiocbp;
|
|
|
|
for (i = 0; i < uap->nent; i++) {
|
|
cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
|
|
if (cbp == 0)
|
|
continue;
|
|
ujoblist[njoblist] = cbp;
|
|
ijoblist[njoblist] = fuword(&cbp->_aiocb_private.kernelinfo);
|
|
njoblist++;
|
|
}
|
|
|
|
if (njoblist == 0) {
|
|
uma_zfree(aiol_zone, ijoblist);
|
|
uma_zfree(aiol_zone, ujoblist);
|
|
return (0);
|
|
}
|
|
|
|
error = 0;
|
|
for (;;) {
|
|
TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
|
|
for (i = 0; i < njoblist; i++) {
|
|
if (((intptr_t)
|
|
cb->uaiocb._aiocb_private.kernelinfo) ==
|
|
ijoblist[i]) {
|
|
if (ujoblist[i] != cb->uuaiocb)
|
|
error = EINVAL;
|
|
uma_zfree(aiol_zone, ijoblist);
|
|
uma_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;
|
|
uma_zfree(aiol_zone, ijoblist);
|
|
uma_zfree(aiol_zone, ujoblist);
|
|
return (error);
|
|
}
|
|
}
|
|
}
|
|
|
|
ki->kaio_flags |= KAIO_WAKEUP;
|
|
error = tsleep(p, PRIBIO | PCATCH, "aiospn", timo);
|
|
splx(s);
|
|
|
|
if (error == ERESTART || error == EINTR) {
|
|
uma_zfree(aiol_zone, ijoblist);
|
|
uma_zfree(aiol_zone, ujoblist);
|
|
return (EINTR);
|
|
} else if (error == EWOULDBLOCK) {
|
|
uma_zfree(aiol_zone, ijoblist);
|
|
uma_zfree(aiol_zone, ujoblist);
|
|
return (EAGAIN);
|
|
}
|
|
}
|
|
|
|
/* NOTREACHED */
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* aio_cancel cancels any non-physio aio operations not currently in
|
|
* progress.
|
|
*/
|
|
int
|
|
aio_cancel(struct thread *td, struct aio_cancel_args *uap)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct kaioinfo *ki;
|
|
struct aiocblist *cbe, *cbn;
|
|
struct file *fp;
|
|
struct filedesc *fdp;
|
|
struct socket *so;
|
|
struct proc *po;
|
|
int s,error;
|
|
int cancelled=0;
|
|
int notcancelled=0;
|
|
struct vnode *vp;
|
|
|
|
fdp = p->p_fd;
|
|
if ((u_int)uap->fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL)
|
|
return (EBADF);
|
|
|
|
if (fp->f_type == DTYPE_VNODE) {
|
|
vp = fp->f_vnode;
|
|
|
|
if (vn_isdisk(vp,&error)) {
|
|
td->td_retval[0] = AIO_NOTCANCELED;
|
|
return (0);
|
|
}
|
|
} else if (fp->f_type == DTYPE_SOCKET) {
|
|
so = fp->f_data;
|
|
|
|
s = splnet();
|
|
|
|
for (cbe = TAILQ_FIRST(&so->so_aiojobq); cbe; cbe = cbn) {
|
|
cbn = TAILQ_NEXT(cbe, list);
|
|
if ((uap->aiocbp == NULL) ||
|
|
(uap->aiocbp == cbe->uuaiocb) ) {
|
|
po = cbe->userproc;
|
|
ki = po->p_aioinfo;
|
|
TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
|
|
TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist);
|
|
TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe, plist);
|
|
if (ki->kaio_flags & KAIO_WAKEUP) {
|
|
wakeup(po);
|
|
}
|
|
cbe->jobstate = JOBST_JOBFINISHED;
|
|
cbe->uaiocb._aiocb_private.status=-1;
|
|
cbe->uaiocb._aiocb_private.error=ECANCELED;
|
|
cancelled++;
|
|
/* XXX cancelled, knote? */
|
|
if (cbe->uaiocb.aio_sigevent.sigev_notify ==
|
|
SIGEV_SIGNAL) {
|
|
PROC_LOCK(cbe->userproc);
|
|
psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
|
|
PROC_UNLOCK(cbe->userproc);
|
|
}
|
|
if (uap->aiocbp)
|
|
break;
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
if ((cancelled) && (uap->aiocbp)) {
|
|
td->td_retval[0] = AIO_CANCELED;
|
|
return (0);
|
|
}
|
|
}
|
|
ki=p->p_aioinfo;
|
|
if (ki == NULL)
|
|
goto done;
|
|
s = splnet();
|
|
|
|
for (cbe = TAILQ_FIRST(&ki->kaio_jobqueue); cbe; cbe = cbn) {
|
|
cbn = TAILQ_NEXT(cbe, plist);
|
|
|
|
if ((uap->fd == cbe->uaiocb.aio_fildes) &&
|
|
((uap->aiocbp == NULL ) ||
|
|
(uap->aiocbp == cbe->uuaiocb))) {
|
|
|
|
if (cbe->jobstate == JOBST_JOBQGLOBAL) {
|
|
TAILQ_REMOVE(&aio_jobs, cbe, list);
|
|
TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
|
|
TAILQ_INSERT_TAIL(&ki->kaio_jobdone, cbe,
|
|
plist);
|
|
cancelled++;
|
|
ki->kaio_queue_finished_count++;
|
|
cbe->jobstate = JOBST_JOBFINISHED;
|
|
cbe->uaiocb._aiocb_private.status = -1;
|
|
cbe->uaiocb._aiocb_private.error = ECANCELED;
|
|
/* XXX cancelled, knote? */
|
|
if (cbe->uaiocb.aio_sigevent.sigev_notify ==
|
|
SIGEV_SIGNAL) {
|
|
PROC_LOCK(cbe->userproc);
|
|
psignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
|
|
PROC_UNLOCK(cbe->userproc);
|
|
}
|
|
} else {
|
|
notcancelled++;
|
|
}
|
|
}
|
|
}
|
|
splx(s);
|
|
done:
|
|
if (notcancelled) {
|
|
td->td_retval[0] = AIO_NOTCANCELED;
|
|
return (0);
|
|
}
|
|
if (cancelled) {
|
|
td->td_retval[0] = AIO_CANCELED;
|
|
return (0);
|
|
}
|
|
td->td_retval[0] = AIO_ALLDONE;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* aio_error is implemented in the kernel level for compatibility purposes only.
|
|
* For a user mode async implementation, it would be best to do it in a userland
|
|
* subroutine.
|
|
*/
|
|
int
|
|
aio_error(struct thread *td, struct aio_error_args *uap)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
int s;
|
|
struct aiocblist *cb;
|
|
struct kaioinfo *ki;
|
|
long jobref;
|
|
|
|
ki = p->p_aioinfo;
|
|
if (ki == NULL)
|
|
return (EINVAL);
|
|
|
|
jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo);
|
|
if ((jobref == -1) || (jobref == 0))
|
|
return (EINVAL);
|
|
|
|
TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
|
|
if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
|
|
jobref) {
|
|
td->td_retval[0] = cb->uaiocb._aiocb_private.error;
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
s = splnet();
|
|
|
|
for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb,
|
|
plist)) {
|
|
if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
|
|
jobref) {
|
|
td->td_retval[0] = EINPROGRESS;
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb,
|
|
plist)) {
|
|
if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
|
|
jobref) {
|
|
td->td_retval[0] = EINPROGRESS;
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
s = splbio();
|
|
for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb,
|
|
plist)) {
|
|
if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
|
|
jobref) {
|
|
td->td_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) {
|
|
td->td_retval[0] = EINPROGRESS;
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
#if (0)
|
|
/*
|
|
* Hack for lio.
|
|
*/
|
|
status = fuword(&uap->aiocbp->_aiocb_private.status);
|
|
if (status == -1)
|
|
return fuword(&uap->aiocbp->_aiocb_private.error);
|
|
#endif
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* syscall - asynchronous read from a file (REALTIME) */
|
|
int
|
|
aio_read(struct thread *td, struct aio_read_args *uap)
|
|
{
|
|
|
|
return aio_aqueue(td, uap->aiocbp, LIO_READ);
|
|
}
|
|
|
|
/* syscall - asynchronous write to a file (REALTIME) */
|
|
int
|
|
aio_write(struct thread *td, struct aio_write_args *uap)
|
|
{
|
|
|
|
return aio_aqueue(td, uap->aiocbp, LIO_WRITE);
|
|
}
|
|
|
|
/* syscall - list directed I/O (REALTIME) */
|
|
int
|
|
lio_listio(struct thread *td, struct lio_listio_args *uap)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
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 < 0 || 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 = uma_zalloc(aiolio_zone, M_WAITOK);
|
|
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;
|
|
|
|
/*
|
|
* Setup signal.
|
|
*/
|
|
if (uap->sig && (uap->mode == LIO_NOWAIT)) {
|
|
error = copyin(uap->sig, &lj->lioj_signal,
|
|
sizeof(lj->lioj_signal));
|
|
if (error) {
|
|
uma_zfree(aiolio_zone, lj);
|
|
return (error);
|
|
}
|
|
if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
|
|
uma_zfree(aiolio_zone, lj);
|
|
return (EINVAL);
|
|
}
|
|
lj->lioj_flags |= LIOJ_SIGNAL;
|
|
}
|
|
TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
|
|
/*
|
|
* 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(&cbptr[i]);
|
|
if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) {
|
|
error = _aio_aqueue(td, 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) {
|
|
int command, found, jobref;
|
|
|
|
for (;;) {
|
|
found = 0;
|
|
for (i = 0; i < uap->nent; i++) {
|
|
/*
|
|
* Fetch address of the control buf pointer in
|
|
* user space.
|
|
*/
|
|
iocb = (struct aiocb *)
|
|
(intptr_t)fuword(&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);
|
|
|
|
TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
|
|
if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo)
|
|
== jobref) {
|
|
if (cb->uaiocb.aio_lio_opcode
|
|
== LIO_WRITE) {
|
|
p->p_stats->p_ru.ru_oublock
|
|
+=
|
|
cb->outputcharge;
|
|
cb->outputcharge = 0;
|
|
} else if (cb->uaiocb.aio_lio_opcode
|
|
== LIO_READ) {
|
|
p->p_stats->p_ru.ru_inblock
|
|
+= cb->inputcharge;
|
|
cb->inputcharge = 0;
|
|
}
|
|
found++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
s = splbio();
|
|
TAILQ_FOREACH(cb, &ki->kaio_bufdone, 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 weird 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 *aioj)
|
|
{
|
|
struct aiocblist *aiocbe = aioj;
|
|
struct aio_liojob *lj = aiocbe->lio;
|
|
struct aiocb *cb = &aiocbe->uaiocb;
|
|
|
|
if ((lj) && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL) &&
|
|
(lj->lioj_queue_count == lj->lioj_queue_finished_count)) {
|
|
PROC_LOCK(lj->lioj_ki->kaio_p);
|
|
psignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo);
|
|
PROC_UNLOCK(lj->lioj_ki->kaio_p);
|
|
lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
|
|
}
|
|
|
|
if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
|
|
PROC_LOCK(aiocbe->userproc);
|
|
psignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo);
|
|
PROC_UNLOCK(aiocbe->userproc);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Interrupt handler for physio, performs the necessary process wakeups, and
|
|
* signals.
|
|
*/
|
|
static void
|
|
aio_physwakeup(struct buf *bp)
|
|
{
|
|
struct aiocblist *aiocbe;
|
|
struct proc *p;
|
|
struct kaioinfo *ki;
|
|
struct aio_liojob *lj;
|
|
|
|
wakeup(bp);
|
|
|
|
aiocbe = (struct aiocblist *)bp->b_caller1;
|
|
if (aiocbe) {
|
|
p = aiocbe->userproc;
|
|
|
|
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_ioflags & BIO_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;
|
|
aiocbe->timeouthandle =
|
|
timeout(process_signal,
|
|
aiocbe, 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);
|
|
|
|
KNOTE(&aiocbe->klist, 0);
|
|
/* Do the wakeup. */
|
|
if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) {
|
|
ki->kaio_flags &= ~KAIO_WAKEUP;
|
|
wakeup(p);
|
|
}
|
|
}
|
|
|
|
if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL)
|
|
aiocbe->timeouthandle =
|
|
timeout(process_signal, aiocbe, 0);
|
|
}
|
|
}
|
|
|
|
/* syscall - wait for the next completion of an aio request */
|
|
int
|
|
aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct timeval atv;
|
|
struct timespec ts;
|
|
struct kaioinfo *ki;
|
|
struct aiocblist *cb = NULL;
|
|
int error, s, timo;
|
|
|
|
suword(uap->aiocbp, (int)NULL);
|
|
|
|
timo = 0;
|
|
if (uap->timeout) {
|
|
/* Get timespec struct. */
|
|
error = copyin(uap->timeout, &ts, sizeof(ts));
|
|
if (error)
|
|
return (error);
|
|
|
|
if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000))
|
|
return (EINVAL);
|
|
|
|
TIMESPEC_TO_TIMEVAL(&atv, &ts);
|
|
if (itimerfix(&atv))
|
|
return (EINVAL);
|
|
timo = tvtohz(&atv);
|
|
}
|
|
|
|
ki = p->p_aioinfo;
|
|
if (ki == NULL)
|
|
return (EAGAIN);
|
|
|
|
for (;;) {
|
|
if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) {
|
|
suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
|
|
td->td_retval[0] = cb->uaiocb._aiocb_private.status;
|
|
if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
|
|
p->p_stats->p_ru.ru_oublock +=
|
|
cb->outputcharge;
|
|
cb->outputcharge = 0;
|
|
} else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
|
|
p->p_stats->p_ru.ru_inblock += cb->inputcharge;
|
|
cb->inputcharge = 0;
|
|
}
|
|
aio_free_entry(cb);
|
|
return (cb->uaiocb._aiocb_private.error);
|
|
}
|
|
|
|
s = splbio();
|
|
if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) {
|
|
splx(s);
|
|
suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
|
|
td->td_retval[0] = cb->uaiocb._aiocb_private.status;
|
|
aio_free_entry(cb);
|
|
return (cb->uaiocb._aiocb_private.error);
|
|
}
|
|
|
|
ki->kaio_flags |= KAIO_WAKEUP;
|
|
error = tsleep(p, PRIBIO | PCATCH, "aiowc", timo);
|
|
splx(s);
|
|
|
|
if (error == ERESTART)
|
|
return (EINTR);
|
|
else if (error < 0)
|
|
return (error);
|
|
else if (error == EINTR)
|
|
return (EINTR);
|
|
else if (error == EWOULDBLOCK)
|
|
return (EAGAIN);
|
|
}
|
|
}
|
|
|
|
/* kqueue attach function */
|
|
static int
|
|
filt_aioattach(struct knote *kn)
|
|
{
|
|
struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
|
|
|
|
/*
|
|
* The aiocbe pointer must be validated before using it, so
|
|
* registration is restricted to the kernel; the user cannot
|
|
* set EV_FLAG1.
|
|
*/
|
|
if ((kn->kn_flags & EV_FLAG1) == 0)
|
|
return (EPERM);
|
|
kn->kn_flags &= ~EV_FLAG1;
|
|
|
|
SLIST_INSERT_HEAD(&aiocbe->klist, kn, kn_selnext);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* kqueue detach function */
|
|
static void
|
|
filt_aiodetach(struct knote *kn)
|
|
{
|
|
struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
|
|
|
|
SLIST_REMOVE(&aiocbe->klist, kn, knote, kn_selnext);
|
|
}
|
|
|
|
/* kqueue filter function */
|
|
/*ARGSUSED*/
|
|
static int
|
|
filt_aio(struct knote *kn, long hint)
|
|
{
|
|
struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
|
|
|
|
kn->kn_data = aiocbe->uaiocb._aiocb_private.error;
|
|
if (aiocbe->jobstate != JOBST_JOBFINISHED &&
|
|
aiocbe->jobstate != JOBST_JOBBFINISHED)
|
|
return (0);
|
|
kn->kn_flags |= EV_EOF;
|
|
return (1);
|
|
}
|