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freebsd-dev/sys/kern/vfs_aio.c

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/*
* Copyright (c) 1997 John S. Dyson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. John S. Dyson's name may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* DISCLAIMER: This code isn't warranted to do anything useful. Anything
* bad that happens because of using this software isn't the responsibility
* of the author. This software is distributed AS-IS.
*
* $Id: vfs_aio.c,v 1.10 1997/11/07 08:53:03 phk Exp $
*/
/*
* This file contains support for the POSIX.4 AIO facility.
*
* The initial version provides only the (bogus) synchronous semantics
* but will support async in the future. Note that a bit
* in a private field allows the user mode subroutine to adapt
* the kernel operations to true POSIX.4 for future compatibility.
*
* This code is used to support true POSIX.4 AIO/LIO with the help
* of a user mode subroutine package. Note that eventually more support
* will be pushed into the kernel.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/lock.h>
#include <sys/unistd.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <sys/aio.h>
#include <sys/shm.h>
#include <machine/cpu.h>
static MALLOC_DEFINE(M_AIO, "AIO", "AIO structure(s)");
#define AIOCBLIST_CANCELLED 0x1
#define AIOCBLIST_RUNDOWN 0x4
#define AIOCBLIST_ASYNCFREE 0x8
#define AIOCBLIST_SUSPEND 0x10
#if 0
#define DEBUGAIO
#define DIAGNOSTIC
#endif
#define DEBUGAIO 1
static int jobrefid;
#define JOBST_NULL 0x0
#define JOBST_JOBQPROC 0x1
#define JOBST_JOBQGLOBAL 0x2
#define JOBST_JOBRUNNING 0x3
#define JOBST_JOBFINISHED 0x4
#define MAX_AIO_PER_PROC 32
#define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */
#define MAX_AIO_PROCS 128
#define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */
#define TARGET_AIO_PROCS 64
int max_aio_procs = MAX_AIO_PROCS;
int num_aio_procs = 0;
int target_aio_procs = TARGET_AIO_PROCS;
int max_queue_count = MAX_AIO_QUEUE;
int num_queue_count = 0;
int max_aio_per_proc = MAX_AIO_PER_PROC,
max_aio_queue_per_proc=MAX_AIO_QUEUE_PER_PROC;
SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "AIO mgmt");
SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc,
CTLFLAG_RW, &max_aio_per_proc, 0, "");
SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc,
CTLFLAG_RW, &max_aio_queue_per_proc, 0, "");
SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs,
CTLFLAG_RW, &max_aio_procs, 0, "");
SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs,
CTLFLAG_RD, &num_aio_procs, 0, "");
SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count,
CTLFLAG_RD, &num_queue_count, 0, "");
SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue,
CTLFLAG_RW, &max_queue_count, 0, "");
SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs,
CTLFLAG_RW, &target_aio_procs, 0, "");
#if DEBUGAIO > 0
static int debugaio;
SYSCTL_INT(_vfs_aio, OID_AUTO, debugaio, CTLFLAG_RW, &debugaio, 0, "");
#endif
/*
* Job queue item
*/
struct aiocblist {
TAILQ_ENTRY (aiocblist) list; /* List of jobs */
TAILQ_ENTRY (aiocblist) plist; /* List of jobs for proc */
int jobflags;
int jobstate;
struct proc *userproc; /* User process */
struct aioproclist *jobaioproc; /* AIO process descriptor */
struct aiocb uaiocb; /* Kernel I/O control block */
};
#define AIOP_FREE 0x1 /* proc on free queue */
/*
* AIO process info
*/
struct aioproclist {
int aioprocflags; /* AIO proc flags */
TAILQ_ENTRY(aioproclist) list; /* List of processes */
struct proc *aioproc; /* The AIO thread */
TAILQ_HEAD (,aiocblist) jobtorun; /* suggested job to run */
};
struct kaioinfo {
int kaio_maxactive_count; /* maximum number of AIOs */
int kaio_active_count; /* number of currently used AIOs */
int kaio_qallowed_count; /* maxiumu size of AIO queue */
int kaio_queue_count; /* size of AIO queue */
TAILQ_HEAD (,aiocblist) kaio_jobqueue; /* job queue for process */
TAILQ_HEAD (,aiocblist) kaio_jobdone; /* done queue for process */
};
TAILQ_HEAD (,aioproclist) aio_freeproc, aio_activeproc;
TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */
TAILQ_HEAD(,aiocblist) aio_freejobs;
void aio_init_aioinfo(struct proc *p) ;
void aio_onceonly(void *) ;
int aio_free_entry(struct aiocblist *aiocbe);
void aio_cancel_internal(struct aiocblist *aiocbe);
void aio_process(struct aiocblist *aiocbe);
void pmap_newvmspace(struct vmspace *);
static int aio_newproc(void) ;
static int aio_aqueue(struct proc *p, struct aiocb *job, int type) ;
static void aio_marksuspend(struct proc *p, int njobs, int *joblist, int set) ;
SYSINIT(aio, SI_SUB_VFS, SI_ORDER_ANY, aio_onceonly, NULL);
/*
* Startup initialization
*/
void
aio_onceonly(void *na) {
TAILQ_INIT(&aio_freeproc);
TAILQ_INIT(&aio_activeproc);
TAILQ_INIT(&aio_jobs);
TAILQ_INIT(&aio_freejobs);
}
/*
* Init the per-process aioinfo structure.
*/
void
aio_init_aioinfo(struct proc *p) {
struct kaioinfo *ki;
if (p->p_aioinfo == NULL) {
ki = malloc(sizeof (struct kaioinfo), M_AIO, M_WAITOK);
p->p_aioinfo = ki;
ki->kaio_maxactive_count = max_aio_per_proc;
ki->kaio_active_count = 0;
ki->kaio_qallowed_count = max_aio_queue_per_proc;
ki->kaio_queue_count = 0;
TAILQ_INIT(&ki->kaio_jobdone);
TAILQ_INIT(&ki->kaio_jobqueue);
}
}
/*
* Free a job entry. Wait for completion if it is currently
* active, but don't delay forever. If we delay, we return
* a flag that says that we have to restart the queue scan.
*/
int
aio_free_entry(struct aiocblist *aiocbe) {
struct kaioinfo *ki;
struct aioproclist *aiop;
struct proc *p;
if (aiocbe->jobstate == JOBST_NULL)
panic("aio_free_entry: freeing already free job");
p = aiocbe->userproc;
ki = p->p_aioinfo;
if (ki == NULL)
panic("aio_free_entry: missing p->p_aioinfo");
if (aiocbe->jobstate == JOBST_JOBRUNNING) {
if (aiocbe->jobflags & AIOCBLIST_ASYNCFREE)
return 0;
aiocbe->jobflags |= AIOCBLIST_RUNDOWN;
tsleep(aiocbe, PRIBIO|PCATCH, "jobwai", 0);
/*
if (tsleep(aiocbe, PRIBIO|PCATCH, "jobwai", hz*5)) {
aiocbe->jobflags |= AIOCBLIST_ASYNCFREE;
aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
return 1;
}
aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
*/
}
aiocbe->jobflags &= ~AIOCBLIST_ASYNCFREE;
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");
--ki->kaio_queue_count;
--num_queue_count;
#if DEBUGAIO > 0
if (debugaio > 0)
printf("freeing entry: %d, %d\n",
ki->kaio_queue_count, num_queue_count);
#endif
if ( aiocbe->jobstate == JOBST_JOBQPROC) {
aiop = aiocbe->jobaioproc;
TAILQ_REMOVE(&aiop->jobtorun, aiocbe, list);
} else if ( aiocbe->jobstate == JOBST_JOBQGLOBAL) {
TAILQ_REMOVE(&aio_jobs, aiocbe, list);
} else if ( aiocbe->jobstate == JOBST_JOBFINISHED) {
ki = p->p_aioinfo;
TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist);
}
TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
aiocbe->jobstate = JOBST_NULL;
return 0;
}
/*
* Rundown the jobs for a given process.
*/
void
aio_proc_rundown(struct proc *p) {
struct kaioinfo *ki;
struct aiocblist *aiocbe, *aiocbn;
ki = p->p_aioinfo;
if (ki == NULL)
return;
while (ki->kaio_active_count > 0) {
if (tsleep(ki, PRIBIO, "kaiowt", 60 * hz))
break;
}
#if DEBUGAIO > 0
if (debugaio > 0)
printf("Proc rundown: %d %d\n",
num_queue_count, ki->kaio_queue_count);
#endif
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;
}
free(ki, M_AIO);
p->p_aioinfo = NULL;
}
/*
* Select a job to run (called by an AIO daemon)
*/
static struct aiocblist *
aio_selectjob(struct aioproclist *aiop) {
struct aiocblist *aiocbe;
aiocbe = TAILQ_FIRST(&aiop->jobtorun);
if (aiocbe) {
TAILQ_REMOVE(&aiop->jobtorun, aiocbe, list);
return aiocbe;
}
for (aiocbe = TAILQ_FIRST(&aio_jobs);
aiocbe;
aiocbe = TAILQ_NEXT(aiocbe, list)) {
struct kaioinfo *ki;
struct proc *userp;
userp = aiocbe->userproc;
ki = userp->p_aioinfo;
if (ki->kaio_active_count < ki->kaio_maxactive_count) {
TAILQ_REMOVE(&aio_jobs, aiocbe, list);
return aiocbe;
}
}
return NULL;
}
/*
* The AIO activity proper.
*/
void
aio_process(struct aiocblist *aiocbe) {
struct filedesc *fdp;
struct proc *userp;
struct aiocb *cb;
struct file *fp;
struct uio auio;
struct iovec aiov;
unsigned int fd;
int cnt;
int error;
off_t offset;
userp = aiocbe->userproc;
cb = &aiocbe->uaiocb;
#if DEBUGAIO > 0
if (debugaio > 1)
printf("AIO %s, fd: %d, offset: 0x%x, address: 0x%x, size: %d\n",
cb->aio_lio_opcode == LIO_READ?"Read":"Write",
cb->aio_fildes, (int) cb->aio_offset,
cb->aio_buf, cb->aio_nbytes);
#endif
#if SLOW
tsleep(curproc, PVM, "aioprc", hz);
#endif
fdp = curproc->p_fd;
/*
* Range check file descriptor
*/
fd = cb->aio_fildes;
fp = fdp->fd_ofiles[fd];
aiov.iov_base = cb->aio_buf;
aiov.iov_len = cb->aio_nbytes;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = offset = cb->aio_offset;
auio.uio_resid = cb->aio_nbytes;
cnt = cb->aio_nbytes;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_procp = curproc;
if (cb->aio_lio_opcode == LIO_READ) {
auio.uio_rw = UIO_READ;
error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred);
} else {
auio.uio_rw = UIO_WRITE;
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) && (cb->aio_lio_opcode == LIO_WRITE))
psignal(userp, SIGPIPE);
}
}
#if DEBUGAIO > 0
if (debugaio > 1)
printf("%s complete: error: %d, status: %d, nio: %d, resid: %d, offset: %d\n",
cb->aio_lio_opcode == LIO_READ?"Read":"Write",
error, cnt, cnt - auio.uio_resid, auio.uio_resid, (int) offset & 0xffffffff);
#endif
cnt -= auio.uio_resid;
cb->_aiocb_private.error = error;
cb->_aiocb_private.status = cnt;
return;
}
/*
* The AIO daemon.
*/
static void
aio_startproc(void *uproc)
{
struct aioproclist *aiop;
/*
* Allocate and ready the aio control info
*/
aiop = malloc(sizeof *aiop, M_AIO, M_WAITOK);
aiop->aioproc = curproc;
aiop->aioprocflags |= AIOP_FREE;
TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
TAILQ_INIT(&aiop->jobtorun);
/*
* Get rid of current address space
*/
if (curproc->p_vmspace->vm_refcnt == 1) {
if (curproc->p_vmspace->vm_shm)
shmexit(curproc);
pmap_remove_pages(&curproc->p_vmspace->vm_pmap, 0, USRSTACK);
vm_map_remove(&curproc->p_vmspace->vm_map, 0, USRSTACK);
} else {
vmspace_exec(curproc);
}
/*
* Make up a name for the daemon
*/
strcpy(curproc->p_comm, "aiodaemon");
/*
* Get rid of our current filedescriptors
*/
fdfree(curproc);
curproc->p_fd = NULL;
curproc->p_ucred = crcopy(curproc->p_ucred);
curproc->p_ucred->cr_uid = 0;
curproc->p_ucred->cr_groups[0] = 1;
curproc->p_flag |= P_SYSTEM;
#if DEBUGAIO > 0
if (debugaio > 2)
printf("Started new process: %d\n", curproc->p_pid);
#endif
wakeup(&aio_freeproc);
while(1) {
struct vmspace *myvm, *tmpvm;
struct proc *cp = curproc;
struct aiocblist *aiocbe;
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;
}
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