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e6bdc05ff7
freebsd/sys/kern/vfs_aio.c
David Xu e6bdc05ff7 Er, rescure a deleted comment line.
2006-01-24 02:50:42 +00:00

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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.
*/
/*
* This file contains support for the POSIX 1003.1B AIO/LIO facility.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/eventhandler.h>
#include <sys/sysproto.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/kthread.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/unistd.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/signalvar.h>
#include <sys/protosw.h>
#include <sys/sema.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syscall.h>
#include <sys/sysent.h>
#include <sys/sysctl.h>
#include <sys/sx.h>
#include <sys/taskqueue.h>
#include <sys/vnode.h>
#include <sys/conf.h>
#include <sys/event.h>
#include <machine/atomic.h>
#include <posix4/posix4.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/uma.h>
#include <sys/aio.h>
#include "opt_vfs_aio.h"
/*
* Counter for allocating reference ids to new jobs. Wrapped to 1 on
* overflow.
*/
static long jobrefid;
#define JOBST_NULL 0x0
#define JOBST_JOBQSOCK 0x1
#define JOBST_JOBQGLOBAL 0x2
#define JOBST_JOBRUNNING 0x3
#define JOBST_JOBFINISHED 0x4
#define JOBST_JOBQBUF 0x5
#ifndef MAX_AIO_PER_PROC
#define MAX_AIO_PER_PROC 32
#endif
#ifndef MAX_AIO_QUEUE_PER_PROC
#define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */
#endif
#ifndef MAX_AIO_PROCS
#define MAX_AIO_PROCS 32
#endif
#ifndef MAX_AIO_QUEUE
#define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */
#endif
#ifndef TARGET_AIO_PROCS
#define TARGET_AIO_PROCS 4
#endif
#ifndef MAX_BUF_AIO
#define MAX_BUF_AIO 16
#endif
#ifndef AIOD_TIMEOUT_DEFAULT
#define AIOD_TIMEOUT_DEFAULT (10 * hz)
#endif
#ifndef AIOD_LIFETIME_DEFAULT
#define AIOD_LIFETIME_DEFAULT (30 * hz)
#endif
static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0, "Async IO management");
static int max_aio_procs = MAX_AIO_PROCS;
SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs,
CTLFLAG_RW, &max_aio_procs, 0,
"Maximum number of kernel threads to use for handling async IO ");
static int num_aio_procs = 0;
SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs,
CTLFLAG_RD, &num_aio_procs, 0,
"Number of presently active kernel threads for async IO");
/*
* The code will adjust the actual number of AIO processes towards this
* number when it gets a chance.
*/
static int target_aio_procs = TARGET_AIO_PROCS;
SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs,
0, "Preferred number of ready kernel threads for async IO");
static int max_queue_count = MAX_AIO_QUEUE;
SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0,
"Maximum number of aio requests to queue, globally");
static int num_queue_count = 0;
SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0,
"Number of queued aio requests");
static int num_buf_aio = 0;
SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
"Number of aio requests presently handled by the buf subsystem");
/* Number of async I/O thread in the process of being started */
/* XXX This should be local to aio_aqueue() */
static int num_aio_resv_start = 0;
static int aiod_timeout;
SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_timeout, CTLFLAG_RW, &aiod_timeout, 0,
"Timeout value for synchronous aio operations");
static int aiod_lifetime;
SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0,
"Maximum lifetime for idle aiod");
static int unloadable = 0;
SYSCTL_INT(_vfs_aio, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0,
"Allow unload of aio (not recommended)");
static int max_aio_per_proc = MAX_AIO_PER_PROC;
SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
0, "Maximum active aio requests per process (stored in the process)");
static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
&max_aio_queue_per_proc, 0,
"Maximum queued aio requests per process (stored in the process)");
static int max_buf_aio = MAX_BUF_AIO;
SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
"Maximum buf aio requests per process (stored in the process)");
typedef struct oaiocb {
int aio_fildes; /* File descriptor */
off_t aio_offset; /* File offset for I/O */
volatile void *aio_buf; /* I/O buffer in process space */
size_t aio_nbytes; /* Number of bytes for I/O */
struct osigevent aio_sigevent; /* Signal to deliver */
int aio_lio_opcode; /* LIO opcode */
int aio_reqprio; /* Request priority -- ignored */
struct __aiocb_private _aiocb_private;
} oaiocb_t;
struct aiocblist {
TAILQ_ENTRY(aiocblist) list; /* List of jobs */
TAILQ_ENTRY(aiocblist) plist; /* List of jobs for proc */
TAILQ_ENTRY(aiocblist) allist;
int jobflags;
int jobstate;
int inputcharge;
int outputcharge;
struct buf *bp; /* Buffer pointer */
struct proc *userproc; /* User process */
struct ucred *cred; /* Active credential when created */
struct file *fd_file; /* Pointer to file structure */
struct aioliojob *lio; /* Optional lio job */
struct aiocb *uuaiocb; /* Pointer in userspace of aiocb */
struct knlist klist; /* list of knotes */
struct aiocb uaiocb; /* Kernel I/O control block */
ksiginfo_t ksi; /* Realtime signal info */
struct task biotask;
};
/* jobflags */
#define AIOCBLIST_RUNDOWN 0x04
#define AIOCBLIST_DONE 0x10
#define AIOCBLIST_BUFDONE 0x20
/*
* AIO process info
*/
#define AIOP_FREE 0x1 /* proc on free queue */
struct aiothreadlist {
int aiothreadflags; /* AIO proc flags */
TAILQ_ENTRY(aiothreadlist) list; /* List of processes */
struct thread *aiothread; /* The AIO thread */
};
/*
* data-structure for lio signal management
*/
struct aioliojob {
int lioj_flags;
int lioj_count;
int lioj_finished_count;
struct sigevent lioj_signal; /* signal on all I/O done */
TAILQ_ENTRY(aioliojob) lioj_list;
struct knlist klist; /* list of knotes */
ksiginfo_t lioj_ksi; /* Realtime signal info */
};
#define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */
#define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */
#define LIOJ_KEVENT_POSTED 0x4 /* kevent triggered */
/*
* per process aio data structure
*/
struct kaioinfo {
int kaio_flags; /* per process kaio flags */
int kaio_maxactive_count; /* maximum number of AIOs */
int kaio_active_count; /* number of currently used AIOs */
int kaio_qallowed_count; /* maxiumu size of AIO queue */
int kaio_count; /* size of AIO queue */
int kaio_ballowed_count; /* maximum number of buffers */
int kaio_buffer_count; /* number of physio buffers */
TAILQ_HEAD(,aiocblist) kaio_all; /* all AIOs in the process */
TAILQ_HEAD(,aiocblist) kaio_done; /* done queue for process */
TAILQ_HEAD(,aioliojob) kaio_liojoblist; /* list of lio jobs */
TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */
TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */
TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* queue for aios waiting on sockets */
};
#define KAIO_RUNDOWN 0x1 /* process is being run down */
#define KAIO_WAKEUP 0x2 /* wakeup process when there is a significant event */
static TAILQ_HEAD(,aiothreadlist) aio_freeproc; /* Idle daemons */
static struct sema aio_newproc_sem;
static struct mtx aio_job_mtx;
static struct mtx aio_sock_mtx;
static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */
static struct unrhdr *aiod_unr;
static void aio_init_aioinfo(struct proc *p);
static void aio_onceonly(void);
static int aio_free_entry(struct aiocblist *aiocbe);
static void aio_process(struct aiocblist *aiocbe);
static int aio_newproc(int *);
static int aio_aqueue(struct thread *td, struct aiocb *job,
struct aioliojob *lio, int type, int osigev);
static void aio_physwakeup(struct buf *bp);
static void aio_proc_rundown(void *arg, struct proc *p);
static int aio_qphysio(struct proc *p, struct aiocblist *iocb);
static void biohelper(void *, int);
static void aio_daemon(void *param);
static void aio_swake_cb(struct socket *, struct sockbuf *);
static int aio_unload(void);
static int filt_aioattach(struct knote *kn);
static void filt_aiodetach(struct knote *kn);
static int filt_aio(struct knote *kn, long hint);
static int filt_lioattach(struct knote *kn);
static void filt_liodetach(struct knote *kn);
static int filt_lio(struct knote *kn, long hint);
#define DONE_BUF 1
#define DONE_QUEUE 2
static void aio_bio_done_notify( struct proc *userp, struct aiocblist *aiocbe, int type);
static int do_lio_listio(struct thread *td, struct lio_listio_args *uap,
int oldsigev);
/*
* Zones for:
* kaio Per process async io info
* aiop async io thread data
* aiocb async io jobs
* aiol list io job pointer - internal to aio_suspend XXX
* aiolio list io jobs
*/
static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiol_zone, aiolio_zone;
/* kqueue filters for aio */
static struct filterops aio_filtops =
{ 0, filt_aioattach, filt_aiodetach, filt_aio };
static struct filterops lio_filtops =
{ 0, filt_lioattach, filt_liodetach, filt_lio };
static eventhandler_tag exit_tag, exec_tag;
TASKQUEUE_DEFINE_THREAD(aiod_bio);
/*
* Main operations function for use as a kernel module.
*/
static int
aio_modload(struct module *module, int cmd, void *arg)
{
int error = 0;
switch (cmd) {
case MOD_LOAD:
aio_onceonly();
break;
case MOD_UNLOAD:
error = aio_unload();
break;
case MOD_SHUTDOWN:
break;
default:
error = EINVAL;
break;
}
return (error);
}
static moduledata_t aio_mod = {
"aio",
&aio_modload,
NULL
};
SYSCALL_MODULE_HELPER(aio_return);
SYSCALL_MODULE_HELPER(aio_suspend);
SYSCALL_MODULE_HELPER(aio_cancel);
SYSCALL_MODULE_HELPER(aio_error);
SYSCALL_MODULE_HELPER(aio_read);
SYSCALL_MODULE_HELPER(aio_write);
SYSCALL_MODULE_HELPER(aio_waitcomplete);
SYSCALL_MODULE_HELPER(lio_listio);
SYSCALL_MODULE_HELPER(oaio_read);
SYSCALL_MODULE_HELPER(oaio_write);
SYSCALL_MODULE_HELPER(olio_listio);
DECLARE_MODULE(aio, aio_mod,
SI_SUB_VFS, SI_ORDER_ANY);
MODULE_VERSION(aio, 1);
/*
* Startup initialization
*/
static void
aio_onceonly(void)
{
/* XXX: should probably just use so->callback */
aio_swake = &aio_swake_cb;
exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL,
EVENTHANDLER_PRI_ANY);
exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown, NULL,
EVENTHANDLER_PRI_ANY);
kqueue_add_filteropts(EVFILT_AIO, &aio_filtops);
kqueue_add_filteropts(EVFILT_LIO, &lio_filtops);
TAILQ_INIT(&aio_freeproc);
sema_init(&aio_newproc_sem, 0, "aio_new_proc");
mtx_init(&aio_job_mtx, "aio_job", NULL, MTX_DEF);
mtx_init(&aio_sock_mtx, "aio_sock", NULL, MTX_DEF);
TAILQ_INIT(&aio_jobs);
aiod_unr = new_unrhdr(1, INT_MAX, NULL);
kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL,
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
aiop_zone = uma_zcreate("AIOP", sizeof(struct aiothreadlist), NULL,
NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
aiocb_zone = uma_zcreate("AIOCB", sizeof(struct aiocblist), NULL, NULL,
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
aiol_zone = uma_zcreate("AIOL", AIO_LISTIO_MAX*sizeof(intptr_t) , NULL,
NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL,
NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
aiod_timeout = AIOD_TIMEOUT_DEFAULT;
aiod_lifetime = AIOD_LIFETIME_DEFAULT;
jobrefid = 1;
async_io_version = _POSIX_VERSION;
p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, AIO_LISTIO_MAX);
p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE);
p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0);
}
/*
* Callback for unload of AIO when used as a module.
*/
static int
aio_unload(void)
{
int error;
/*
* XXX: no unloads by default, it's too dangerous.
* perhaps we could do it if locked out callers and then
* did an aio_proc_rundown() on each process.
*
* jhb: aio_proc_rundown() needs to run on curproc though,
* so I don't think that would fly.
*/
if (!unloadable)
return (EOPNOTSUPP);
error = kqueue_del_filteropts(EVFILT_AIO);
if (error)
return error;
error = kqueue_del_filteropts(EVFILT_LIO);
if (error)
return error;
async_io_version = 0;
aio_swake = NULL;
taskqueue_free(taskqueue_aiod_bio);
delete_unrhdr(aiod_unr);
uma_zdestroy(kaio_zone);
uma_zdestroy(aiop_zone);
uma_zdestroy(aiocb_zone);
uma_zdestroy(aiol_zone);
uma_zdestroy(aiolio_zone);
EVENTHANDLER_DEREGISTER(process_exit, exit_tag);
EVENTHANDLER_DEREGISTER(process_exec, exec_tag);
mtx_destroy(&aio_job_mtx);
mtx_destroy(&aio_sock_mtx);
sema_destroy(&aio_newproc_sem);
p31b_setcfg(CTL_P1003_1B_AIO_LISTIO_MAX, -1);
p31b_setcfg(CTL_P1003_1B_AIO_MAX, -1);
p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, -1);
return (0);
}
/*
* Init the per-process aioinfo structure. The aioinfo limits are set
* per-process for user limit (resource) management.
*/
static void
aio_init_aioinfo(struct proc *p)
{
struct kaioinfo *ki;
ki = uma_zalloc(kaio_zone, M_WAITOK);
ki->kaio_flags = 0;
ki->kaio_maxactive_count = max_aio_per_proc;
ki->kaio_active_count = 0;
ki->kaio_qallowed_count = max_aio_queue_per_proc;
ki->kaio_count = 0;
ki->kaio_ballowed_count = max_buf_aio;
ki->kaio_buffer_count = 0;
TAILQ_INIT(&ki->kaio_all);
TAILQ_INIT(&ki->kaio_done);
TAILQ_INIT(&ki->kaio_jobqueue);
TAILQ_INIT(&ki->kaio_bufqueue);
TAILQ_INIT(&ki->kaio_liojoblist);
TAILQ_INIT(&ki->kaio_sockqueue);
PROC_LOCK(p);
if (p->p_aioinfo == NULL) {
p->p_aioinfo = ki;
PROC_UNLOCK(p);
} else {
PROC_UNLOCK(p);
uma_zfree(kaio_zone, ki);
}
while (num_aio_procs < target_aio_procs)
aio_newproc(NULL);
}
static int
aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi)
{
PROC_LOCK_ASSERT(p, MA_OWNED);
if (!KSI_ONQ(ksi)) {
ksi->ksi_code = SI_ASYNCIO;
ksi->ksi_flags |= KSI_EXT | KSI_INS;
return (psignal_event(p, sigev, ksi));
}
return (0);
}
/*
* Free a job entry. Wait for completion if it is currently active, but don't
* delay forever. If we delay, we return a flag that says that we have to
* restart the queue scan.
*/
static int
aio_free_entry(struct aiocblist *aiocbe)
{
struct kaioinfo *ki;
struct aioliojob *lj;
struct proc *p;
p = aiocbe->userproc;
PROC_LOCK_ASSERT(p, MA_OWNED);
MPASS(curproc == p);
MPASS(aiocbe->jobstate == JOBST_JOBFINISHED);
ki = p->p_aioinfo;
MPASS(ki != NULL);
atomic_subtract_int(&num_queue_count, 1);
ki->kaio_count--;
MPASS(ki->kaio_count >= 0);
lj = aiocbe->lio;
if (lj) {
lj->lioj_count--;
lj->lioj_finished_count--;
if (lj->lioj_count == 0) {
TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
/* lio is going away, we need to destroy any knotes */
knlist_delete(&lj->klist, curthread, 1);
sigqueue_take(&lj->lioj_ksi);
uma_zfree(aiolio_zone, lj);
}
}
TAILQ_REMOVE(&ki->kaio_done, aiocbe, plist);
TAILQ_REMOVE(&ki->kaio_all, aiocbe, allist);
/* aiocbe is going away, we need to destroy any knotes */
knlist_delete(&aiocbe->klist, curthread, 1);
sigqueue_take(&aiocbe->ksi);
MPASS(aiocbe->bp == NULL);
aiocbe->jobstate = JOBST_NULL;
/* Wake up anyone who has interest to do cleanup work. */
if (ki->kaio_flags & (KAIO_WAKEUP | KAIO_RUNDOWN)) {
ki->kaio_flags &= ~KAIO_WAKEUP;
wakeup(&p->p_aioinfo);
}
PROC_UNLOCK(p);
/*
* The thread argument here is used to find the owning process
* and is also passed to fo_close() which may pass it to various
* places such as devsw close() routines. Because of that, we
* need a thread pointer from the process owning the job that is
* persistent and won't disappear out from under us or move to
* another process.
*
* Currently, all the callers of this function call it to remove
* an aiocblist from the current process' job list either via a
* syscall or due to the current process calling exit() or
* execve(). Thus, we know that p == curproc. We also know that
* curthread can't exit since we are curthread.
*
* Therefore, we use curthread as the thread to pass to
* knlist_delete(). This does mean that it is possible for the
* thread pointer at close time to differ from the thread pointer
* at open time, but this is already true of file descriptors in
* a multithreaded process.
*/
fdrop(aiocbe->fd_file, curthread);
crfree(aiocbe->cred);
uma_zfree(aiocb_zone, aiocbe);
PROC_LOCK(p);
return (0);
}
/*
* Rundown the jobs for a given process.
*/
static void
aio_proc_rundown(void *arg, struct proc *p)
{
struct kaioinfo *ki;
struct aioliojob *lj;
struct aiocblist *cbe, *cbn;
struct file *fp;
struct socket *so;
KASSERT(curthread->td_proc == p,
("%s: called on non-curproc", __func__));
ki = p->p_aioinfo;
if (ki == NULL)
return;
PROC_LOCK(p);
restart:
ki->kaio_flags |= KAIO_RUNDOWN;
/*
* Try to cancel all pending requests. This code simulates
* aio_cancel on all pending I/O requests.
*/
while ((cbe = TAILQ_FIRST(&ki->kaio_sockqueue))) {
fp = cbe->fd_file;
so = fp->f_data;
mtx_lock(&aio_sock_mtx);
TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
mtx_unlock(&aio_sock_mtx);
TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist);
TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, cbe, plist);
cbe->jobstate = JOBST_JOBQGLOBAL;
}
TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) {
mtx_lock(&aio_job_mtx);
if (cbe->jobstate == JOBST_JOBQGLOBAL) {
TAILQ_REMOVE(&aio_jobs, cbe, list);
mtx_unlock(&aio_job_mtx);
cbe->jobstate = JOBST_JOBFINISHED;
cbe->uaiocb._aiocb_private.status = -1;
cbe->uaiocb._aiocb_private.error = ECANCELED;
TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
aio_bio_done_notify(p, cbe, DONE_QUEUE);
} else {
mtx_unlock(&aio_job_mtx);
}
}
if (TAILQ_FIRST(&ki->kaio_sockqueue))
goto restart;
/* Wait for all running I/O to be finished */
if (TAILQ_FIRST(&ki->kaio_bufqueue) ||
TAILQ_FIRST(&ki->kaio_jobqueue)) {
ki->kaio_flags |= KAIO_WAKEUP;
msleep(&p->p_aioinfo, &p->p_mtx, PRIBIO, "aioprn", hz);
goto restart;
}
/* Free all completed I/O requests. */
while ((cbe = TAILQ_FIRST(&ki->kaio_done)) != NULL)
aio_free_entry(cbe);
while ((lj = TAILQ_FIRST(&ki->kaio_liojoblist)) != NULL) {
if (lj->lioj_count == 0) {
TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
knlist_delete(&lj->klist, curthread, 1);
sigqueue_take(&lj->lioj_ksi);
uma_zfree(aiolio_zone, lj);
} else {
panic("LIO job not cleaned up: C:%d, FC:%d\n",
lj->lioj_count, lj->lioj_finished_count);
}
}
uma_zfree(kaio_zone, ki);
p->p_aioinfo = NULL;
PROC_UNLOCK(p);
}
/*
* Select a job to run (called by an AIO daemon).
*/
static struct aiocblist *
aio_selectjob(struct aiothreadlist *aiop)
{
struct aiocblist *aiocbe;
struct kaioinfo *ki;
struct proc *userp;
mtx_assert(&aio_job_mtx, MA_OWNED);
TAILQ_FOREACH(aiocbe, &aio_jobs, list) {
userp = aiocbe->userproc;
ki = userp->p_aioinfo;
if (ki->kaio_active_count < ki->kaio_maxactive_count) {
TAILQ_REMOVE(&aio_jobs, aiocbe, list);
/* Account for currently active jobs. */
ki->kaio_active_count++;
aiocbe->jobstate = JOBST_JOBRUNNING;
break;
}
}
return (aiocbe);
}
/*
* The AIO processing activity. This is the code that does the I/O request for
* the non-physio version of the operations. The normal vn operations are used,
* and this code should work in all instances for every type of file, including
* pipes, sockets, fifos, and regular files.
*
* XXX I don't think these code work well with pipes, sockets and fifo, the
* problem is the aiod threads can be blocked if there is not data or no
* buffer space, and file was not opened with O_NONBLOCK, all aiod threads
* will be blocked if there is couple of such processes. We need a FOF_OFFSET
* like flag to override f_flag to tell low level system to do non-blocking
* I/O, we can not muck O_NONBLOCK because there is full of race between
* userland and aiod threads, although there is a trigger mechanism for socket,
* but it also does not work well if userland is misbehaviored.
*/
static void
aio_process(struct aiocblist *aiocbe)
{
struct ucred *td_savedcred;
struct thread *td;
struct proc *mycp;
struct aiocb *cb;
struct file *fp;
struct socket *so;
struct uio auio;
struct iovec aiov;
int cnt;
int error;
int oublock_st, oublock_end;
int inblock_st, inblock_end;
td = curthread;
td_savedcred = td->td_ucred;
td->td_ucred = aiocbe->cred;
mycp = td->td_proc;
cb = &aiocbe->uaiocb;
fp = aiocbe->fd_file;
aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
aiov.iov_len = cb->aio_nbytes;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = cb->aio_offset;
auio.uio_resid = cb->aio_nbytes;
cnt = cb->aio_nbytes;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_td = td;
inblock_st = mycp->p_stats->p_ru.ru_inblock;
oublock_st = mycp->p_stats->p_ru.ru_oublock;
/*
* aio_aqueue() acquires a reference to the file that is
* released in aio_free_entry().
*/
if (cb->aio_lio_opcode == LIO_READ) {
auio.uio_rw = UIO_READ;
error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td);
} else {
auio.uio_rw = UIO_WRITE;
error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td);
}
inblock_end = mycp->p_stats->p_ru.ru_inblock;
oublock_end = mycp->p_stats->p_ru.ru_oublock;
aiocbe->inputcharge = inblock_end - inblock_st;
aiocbe->outputcharge = oublock_end - oublock_st;
if ((error) && (auio.uio_resid != cnt)) {
if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
error = 0;
if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) {
int sigpipe = 1;
if (fp->f_type == DTYPE_SOCKET) {
so = fp->f_data;
if (so->so_options & SO_NOSIGPIPE)
sigpipe = 0;
}
if (sigpipe) {
PROC_LOCK(aiocbe->userproc);
psignal(aiocbe->userproc, SIGPIPE);
PROC_UNLOCK(aiocbe->userproc);
}
}
}
cnt -= auio.uio_resid;
cb->_aiocb_private.error = error;
cb->_aiocb_private.status = cnt;
td->td_ucred = td_savedcred;
}
static void
aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type)
{
struct aioliojob *lj;
struct kaioinfo *ki;
int lj_done;
PROC_LOCK_ASSERT(userp, MA_OWNED);
ki = userp->p_aioinfo;
lj = aiocbe->lio;
lj_done = 0;
if (lj) {
lj->lioj_finished_count++;
if (lj->lioj_count == lj->lioj_finished_count)
lj_done = 1;
}
if (type == DONE_QUEUE) {
aiocbe->jobflags |= AIOCBLIST_DONE;
} else {
aiocbe->jobflags |= AIOCBLIST_BUFDONE;
ki->kaio_buffer_count--;
}
TAILQ_INSERT_TAIL(&ki->kaio_done, aiocbe, plist);
aiocbe->jobstate = JOBST_JOBFINISHED;
if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID)
aio_sendsig(userp, &aiocbe->uaiocb.aio_sigevent, &aiocbe->ksi);
KNOTE_LOCKED(&aiocbe->klist, 1);
if (lj_done) {
if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
lj->lioj_flags |= LIOJ_KEVENT_POSTED;
KNOTE_LOCKED(&lj->klist, 1);
}
if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
== LIOJ_SIGNAL
&& (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi);
lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
}
}
if (ki->kaio_flags & (KAIO_RUNDOWN|KAIO_WAKEUP)) {
ki->kaio_flags &= ~KAIO_WAKEUP;
wakeup(&userp->p_aioinfo);
}
}
/*
* The AIO daemon, most of the actual work is done in aio_process,
* but the setup (and address space mgmt) is done in this routine.
*/
static void
aio_daemon(void *_id)
{
struct aiocblist *aiocbe;
struct aiothreadlist *aiop;
struct kaioinfo *ki;
struct proc *curcp, *mycp, *userp;
struct vmspace *myvm, *tmpvm;
struct thread *td = curthread;
int id = (intptr_t)_id;
/*
* Local copies of curproc (cp) and vmspace (myvm)
*/
mycp = td->td_proc;
myvm = mycp->p_vmspace;
KASSERT(mycp->p_textvp == NULL, ("kthread has a textvp"));
/*
* Allocate and ready the aio control info. There is one aiop structure
* per daemon.
*/
aiop = uma_zalloc(aiop_zone, M_WAITOK);
aiop->aiothread = td;
aiop->aiothreadflags |= AIOP_FREE;
/*
* Place thread (lightweight process) onto the AIO free thread list.
*/
mtx_lock(&aio_job_mtx);
TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
mtx_unlock(&aio_job_mtx);
/*
* Get rid of our current filedescriptors. AIOD's don't need any
* filedescriptors, except as temporarily inherited from the client.
*/
fdfree(td);
/* The daemon resides in its own pgrp. */
setsid(td, NULL);
/*
* Wakeup parent process. (Parent sleeps to keep from blasting away
* and creating too many daemons.)
*/
sema_post(&aio_newproc_sem);
mtx_lock(&aio_job_mtx);
for (;;) {
/*
* curcp is the current daemon process context.
* userp is the current user process context.
*/
curcp = mycp;
/*
* Take daemon off of free queue
*/
if (aiop->aiothreadflags & AIOP_FREE) {
TAILQ_REMOVE(&aio_freeproc, aiop, list);
aiop->aiothreadflags &= ~AIOP_FREE;
}
/*
* Check for jobs.
*/
while ((aiocbe = aio_selectjob(aiop)) != NULL) {
mtx_unlock(&aio_job_mtx);
userp = aiocbe->userproc;
/*
* Connect to process address space for user program.
*/
if (userp != curcp) {
/*
* Save the current address space that we are
* connected to.
*/
tmpvm = mycp->p_vmspace;
/*
* Point to the new user address space, and
* refer to it.
*/
mycp->p_vmspace = userp->p_vmspace;
atomic_add_int(&mycp->p_vmspace->vm_refcnt, 1);
/* Activate the new mapping. */
pmap_activate(FIRST_THREAD_IN_PROC(mycp));
/*
* If the old address space wasn't the daemons
* own address space, then we need to remove the
* daemon's reference from the other process
* that it was acting on behalf of.
*/
if (tmpvm != myvm) {
vmspace_free(tmpvm);
}
curcp = userp;
}
ki = userp->p_aioinfo;
/* Do the I/O function. */
aio_process(aiocbe);
mtx_lock(&aio_job_mtx);
/* Decrement the active job count. */
ki->kaio_active_count--;
mtx_unlock(&aio_job_mtx);
PROC_LOCK(userp);
TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
aio_bio_done_notify(userp, aiocbe, DONE_QUEUE);
if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) {
wakeup(aiocbe);
aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
}
PROC_UNLOCK(userp);
mtx_lock(&aio_job_mtx);
}
/*
* Disconnect from user address space.
*/
if (curcp != mycp) {
mtx_unlock(&aio_job_mtx);
/* Get the user address space to disconnect from. */
tmpvm = mycp->p_vmspace;
/* Get original address space for daemon. */
mycp->p_vmspace = myvm;
/* Activate the daemon's address space. */
pmap_activate(FIRST_THREAD_IN_PROC(mycp));
#ifdef DIAGNOSTIC
if (tmpvm == myvm) {
printf("AIOD: vmspace problem -- %d\n",
mycp->p_pid);
}
#endif
/* Remove our vmspace reference. */
vmspace_free(tmpvm);
curcp = mycp;
mtx_lock(&aio_job_mtx);
/*
* We have to restart to avoid race, we only sleep if
* no job can be selected, that should be
* curcp == mycp.
*/
continue;
}
mtx_assert(&aio_job_mtx, MA_OWNED);
TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
aiop->aiothreadflags |= AIOP_FREE;
/*
* If daemon is inactive for a long time, allow it to exit,
* thereby freeing resources.
*/
if (msleep(aiop->aiothread, &aio_job_mtx, PRIBIO, "aiordy",
aiod_lifetime)) {
if (TAILQ_EMPTY(&aio_jobs)) {
if ((aiop->aiothreadflags & AIOP_FREE) &&
(num_aio_procs > target_aio_procs)) {
TAILQ_REMOVE(&aio_freeproc, aiop, list);
num_aio_procs--;
mtx_unlock(&aio_job_mtx);
uma_zfree(aiop_zone, aiop);
free_unr(aiod_unr, id);
#ifdef DIAGNOSTIC
if (mycp->p_vmspace->vm_refcnt <= 1) {
printf("AIOD: bad vm refcnt for"
" exiting daemon: %d\n",
mycp->p_vmspace->vm_refcnt);
}
#endif
kthread_exit(0);
}
}
}
}
mtx_unlock(&aio_job_mtx);
panic("shouldn't be here\n");
}
/*
* Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
* AIO daemon modifies its environment itself.
*/
static int
aio_newproc(int *start)
{
int error;
struct proc *p;
int id;
id = alloc_unr(aiod_unr);
error = kthread_create(aio_daemon, (void *)(intptr_t)id, &p,
RFNOWAIT, 0, "aiod%d", id);
if (error == 0) {
/*
* Wait until daemon is started.
*/
sema_wait(&aio_newproc_sem);
mtx_lock(&aio_job_mtx);
num_aio_procs++;
if (start != NULL)
(*start)--;
mtx_unlock(&aio_job_mtx);
} else {
free_unr(aiod_unr, id);
}
return (error);
}
/*
* Try the high-performance, low-overhead physio method for eligible
* VCHR devices. This method doesn't use an aio helper thread, and
* thus has very low overhead.
*
* Assumes that the caller, aio_aqueue(), has incremented the file
* structure's reference count, preventing its deallocation for the
* duration of this call.
*/
static int
aio_qphysio(struct proc *p, struct aiocblist *aiocbe)
{
struct aiocb *cb;
struct file *fp;
struct buf *bp;
struct vnode *vp;
struct kaioinfo *ki;
struct aioliojob *lj;
int error;
cb = &aiocbe->uaiocb;
fp = aiocbe->fd_file;
if (fp->f_type != DTYPE_VNODE)
return (-1);
vp = fp->f_vnode;
/*
* If its not a disk, we don't want to return a positive error.
* It causes the aio code to not fall through to try the thread
* way when you're talking to a regular file.
*/
if (!vn_isdisk(vp, &error)) {
if (error == ENOTBLK)
return (-1);
else
return (error);
}
if (cb->aio_nbytes % vp->v_bufobj.bo_bsize)
return (-1);
if (cb->aio_nbytes > vp->v_rdev->si_iosize_max)
return (-1);
if (cb->aio_nbytes >
MAXPHYS - (((vm_offset_t) cb->aio_buf) & PAGE_MASK))
return (-1);
ki = p->p_aioinfo;
if (ki->kaio_buffer_count >= ki->kaio_ballowed_count)
return (-1);
/* Create and build a buffer header for a transfer. */
bp = (struct buf *)getpbuf(NULL);
BUF_KERNPROC(bp);
PROC_LOCK(p);
ki->kaio_count++;
ki->kaio_buffer_count++;
lj = aiocbe->lio;
if (lj)
lj->lioj_count++;
PROC_UNLOCK(p);
/*
* Get a copy of the kva from the physical buffer.
*/
error = 0;
bp->b_bcount = cb->aio_nbytes;
bp->b_bufsize = cb->aio_nbytes;
bp->b_iodone = aio_physwakeup;
bp->b_saveaddr = bp->b_data;
bp->b_data = (void *)(uintptr_t)cb->aio_buf;
bp->b_offset = cb->aio_offset;
bp->b_iooffset = cb->aio_offset;
bp->b_blkno = btodb(cb->aio_offset);
bp->b_iocmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ;
/*
* Bring buffer into kernel space.
*/
if (vmapbuf(bp) < 0) {
error = EFAULT;
goto doerror;
}
PROC_LOCK(p);
aiocbe->bp = bp;
bp->b_caller1 = (void *)aiocbe;
TAILQ_INSERT_TAIL(&ki->kaio_bufqueue, aiocbe, plist);
TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
aiocbe->jobstate = JOBST_JOBQBUF;
cb->_aiocb_private.status = cb->aio_nbytes;
PROC_UNLOCK(p);
atomic_add_int(&num_queue_count, 1);
atomic_add_int(&num_buf_aio, 1);
bp->b_error = 0;
TASK_INIT(&aiocbe->biotask, 0, biohelper, aiocbe);
/* Perform transfer. */
dev_strategy(vp->v_rdev, bp);
return (0);
doerror:
PROC_LOCK(p);
ki->kaio_count--;
ki->kaio_buffer_count--;
if (lj)
lj->lioj_count--;
aiocbe->bp = NULL;
PROC_UNLOCK(p);
relpbuf(bp, NULL);
return (error);
}
/*
* Wake up aio requests that may be serviceable now.
*/
static void
aio_swake_cb(struct socket *so, struct sockbuf *sb)
{
struct aiocblist *cb, *cbn;
struct proc *p;
struct kaioinfo *ki = NULL;
int opcode, wakecount = 0;
struct aiothreadlist *aiop;
if (sb == &so->so_snd) {
opcode = LIO_WRITE;
SOCKBUF_LOCK(&so->so_snd);
so->so_snd.sb_flags &= ~SB_AIO;
SOCKBUF_UNLOCK(&so->so_snd);
} else {
opcode = LIO_READ;
SOCKBUF_LOCK(&so->so_rcv);
so->so_rcv.sb_flags &= ~SB_AIO;
SOCKBUF_UNLOCK(&so->so_rcv);
}
mtx_lock(&aio_sock_mtx);
TAILQ_FOREACH_SAFE(cb, &so->so_aiojobq, list, cbn) {
if (opcode == cb->uaiocb.aio_lio_opcode) {
if (cb->jobstate != JOBST_JOBQSOCK)
panic("invalid queue value");
p = cb->userproc;
ki = p->p_aioinfo;
TAILQ_REMOVE(&so->so_aiojobq, cb, list);
PROC_LOCK(p);
TAILQ_REMOVE(&ki->kaio_sockqueue, cb, plist);
/*
* XXX check AIO_RUNDOWN, and don't put on
* jobqueue if it was set.
*/
TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, cb, plist);
cb->jobstate = JOBST_JOBQGLOBAL;
mtx_lock(&aio_job_mtx);
TAILQ_INSERT_TAIL(&aio_jobs, cb, list);
mtx_unlock(&aio_job_mtx);
PROC_UNLOCK(p);
wakecount++;
}
}
mtx_unlock(&aio_sock_mtx);
while (wakecount--) {
mtx_lock(&aio_job_mtx);
if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
TAILQ_REMOVE(&aio_freeproc, aiop, list);
aiop->aiothreadflags &= ~AIOP_FREE;
wakeup(aiop->aiothread);
}
mtx_unlock(&aio_job_mtx);
}
}
/*
* Queue a new AIO request. Choosing either the threaded or direct physio VCHR
* technique is done in this code.
*/
static int
aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
int type, int oldsigev)
{
struct proc *p = td->td_proc;
struct file *fp;
struct socket *so;
struct aiocblist *aiocbe;
struct aiothreadlist *aiop;
struct kaioinfo *ki;
struct kevent kev;
struct kqueue *kq;
struct file *kq_fp;
struct sockbuf *sb;
int opcode;
int error;
int fd;
int jid;
if (p->p_aioinfo == NULL)
aio_init_aioinfo(p);
ki = p->p_aioinfo;
suword(&job->_aiocb_private.status, -1);
suword(&job->_aiocb_private.error, 0);
suword(&job->_aiocb_private.kernelinfo, -1);
if (num_queue_count >= max_queue_count ||
ki->kaio_count >= ki->kaio_qallowed_count) {
suword(&job->_aiocb_private.error, EAGAIN);
return (EAGAIN);
}
aiocbe = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO);
aiocbe->inputcharge = 0;
aiocbe->outputcharge = 0;
knlist_init(&aiocbe->klist, &p->p_mtx, NULL, NULL, NULL);
if (oldsigev) {
bzero(&aiocbe->uaiocb, sizeof(struct aiocb));
error = copyin(job, &aiocbe->uaiocb, sizeof(struct oaiocb));
bcopy(&aiocbe->uaiocb.__spare__, &aiocbe->uaiocb.aio_sigevent,
sizeof(struct osigevent));
} else {
error = copyin(job, &aiocbe->uaiocb, sizeof(struct aiocb));
}
if (error) {
suword(&job->_aiocb_private.error, error);
uma_zfree(aiocb_zone, aiocbe);
return (error);
}
if (aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT &&
aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL &&
aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID &&
aiocbe->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) {
suword(&job->_aiocb_private.error, EINVAL);
uma_zfree(aiocb_zone, aiocbe);
return (EINVAL);
}
if ((aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) &&
!_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) {
uma_zfree(aiocb_zone, aiocbe);
return (EINVAL);
}
ksiginfo_init(&aiocbe->ksi);
/* Save userspace address of the job info. */
aiocbe->uuaiocb = job;
/* Get the opcode. */
if (type != LIO_NOP)
aiocbe->uaiocb.aio_lio_opcode = type;
opcode = aiocbe->uaiocb.aio_lio_opcode;
/* Fetch the file object for the specified file descriptor. */
fd = aiocbe->uaiocb.aio_fildes;
switch (opcode) {
case LIO_WRITE:
error = fget_write(td, fd, &fp);
break;
case LIO_READ:
error = fget_read(td, fd, &fp);
break;
default:
error = fget(td, fd, &fp);
}
if (error) {
uma_zfree(aiocb_zone, aiocbe);
suword(&job->_aiocb_private.error, EBADF);
return (error);
}
aiocbe->fd_file = fp;
if (aiocbe->uaiocb.aio_offset == -1LL) {
error = EINVAL;
goto aqueue_fail;
}
mtx_lock(&aio_job_mtx);
jid = jobrefid;
if (jobrefid == LONG_MAX)
jobrefid = 1;
else
jobrefid++;
mtx_unlock(&aio_job_mtx);
error = suword(&job->_aiocb_private.kernelinfo, jid);
if (error) {
error = EINVAL;
goto aqueue_fail;
}
aiocbe->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid;
if (opcode == LIO_NOP) {
fdrop(fp, td);
uma_zfree(aiocb_zone, aiocbe);
return (0);
}
if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) {
error = EINVAL;
goto aqueue_fail;
}
if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) {
kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue;
} else
goto no_kqueue;
error = fget(td, (u_int)kev.ident, &kq_fp);
if (error)
goto aqueue_fail;
if (kq_fp->f_type != DTYPE_KQUEUE) {
fdrop(kq_fp, td);
error = EBADF;
goto aqueue_fail;
}
kq = kq_fp->f_data;
kev.ident = (uintptr_t)aiocbe->uuaiocb;
kev.filter = EVFILT_AIO;
kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
kev.data = (intptr_t)aiocbe;
kev.udata = aiocbe->uaiocb.aio_sigevent.sigev_value.sival_ptr;
error = kqueue_register(kq, &kev, td, 1);
fdrop(kq_fp, td);
aqueue_fail:
if (error) {
fdrop(fp, td);
uma_zfree(aiocb_zone, aiocbe);
suword(&job->_aiocb_private.error, error);
goto done;
}
no_kqueue:
suword(&job->_aiocb_private.error, EINPROGRESS);
aiocbe->uaiocb._aiocb_private.error = EINPROGRESS;
aiocbe->userproc = p;
aiocbe->cred = crhold(td->td_ucred);
aiocbe->jobflags = 0;
aiocbe->lio = lj;
if (fp->f_type == DTYPE_SOCKET) {
/*
* Alternate queueing for socket ops: Reach down into the
* descriptor to get the socket data. Then check to see if the
* socket is ready to be read or written (based on the requested
* operation).
*
* If it is not ready for io, then queue the aiocbe on the
* socket, and set the flags so we get a call when sbnotify()
* happens.
*
* Note if opcode is neither LIO_WRITE nor LIO_READ we lock
* and unlock the snd sockbuf for no reason.
*/
so = fp->f_data;
sb = (opcode == LIO_READ) ? &so->so_rcv : &so->so_snd;
SOCKBUF_LOCK(sb);
if (((opcode == LIO_READ) && (!soreadable(so))) || ((opcode ==
LIO_WRITE) && (!sowriteable(so)))) {
mtx_lock(&aio_sock_mtx);
TAILQ_INSERT_TAIL(&so->so_aiojobq, aiocbe, list);
mtx_unlock(&aio_sock_mtx);
sb->sb_flags |= SB_AIO;
PROC_LOCK(p);
TAILQ_INSERT_TAIL(&ki->kaio_sockqueue, aiocbe, plist);
TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
aiocbe->jobstate = JOBST_JOBQSOCK;
ki->kaio_count++;
if (lj)
lj->lioj_count++;
PROC_UNLOCK(p);
SOCKBUF_UNLOCK(sb);
atomic_add_int(&num_queue_count, 1);
error = 0;
goto done;
}
SOCKBUF_UNLOCK(sb);
}
if ((error = aio_qphysio(p, aiocbe)) == 0)
goto done;
#if 0
if (error > 0) {
aiocbe->uaiocb._aiocb_private.error = error;
suword(&job->_aiocb_private.error, error);
goto done;
}
#endif
/* No buffer for daemon I/O. */
aiocbe->bp = NULL;
PROC_LOCK(p);
ki->kaio_count++;
if (lj)
lj->lioj_count++;
TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
TAILQ_INSERT_TAIL(&ki->kaio_all, aiocbe, allist);
mtx_lock(&aio_job_mtx);
TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
aiocbe->jobstate = JOBST_JOBQGLOBAL;
PROC_UNLOCK(p);
atomic_add_int(&num_queue_count, 1);
/*
* If we don't have a free AIO process, and we are below our quota, then
* start one. Otherwise, depend on the subsequent I/O completions to
* pick-up this job. If we don't sucessfully create the new process
* (thread) due to resource issues, we return an error for now (EAGAIN),
* which is likely not the correct thing to do.
*/
retryproc:
error = 0;
if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
TAILQ_REMOVE(&aio_freeproc, aiop, list);
aiop->aiothreadflags &= ~AIOP_FREE;
wakeup(aiop->aiothread);
} else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
((ki->kaio_active_count + num_aio_resv_start) <
ki->kaio_maxactive_count)) {
num_aio_resv_start++;
mtx_unlock(&aio_job_mtx);
error = aio_newproc(&num_aio_resv_start);
mtx_lock(&aio_job_mtx);
if (error) {
num_aio_resv_start--;
goto retryproc;
}
}
mtx_unlock(&aio_job_mtx);
done:
return (error);
}
/*
* Support the aio_return system call, as a side-effect, kernel resources are
* released.
*/
int
aio_return(struct thread *td, struct aio_return_args *uap)
{
struct proc *p = td->td_proc;
struct aiocblist *cb;
struct aiocb *uaiocb;
struct kaioinfo *ki;
int status, error;
ki = p->p_aioinfo;
if (ki == NULL)
return (EINVAL);
uaiocb = uap->aiocbp;
PROC_LOCK(p);
TAILQ_FOREACH(cb, &ki->kaio_done, plist) {
if (cb->uuaiocb == uaiocb)
break;
}
if (cb != NULL) {
MPASS(cb->jobstate == JOBST_JOBFINISHED);
status = cb->uaiocb._aiocb_private.status;
error = cb->uaiocb._aiocb_private.error;
td->td_retval[0] = status;
if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
p->p_stats->p_ru.ru_oublock +=
cb->outputcharge;
cb->outputcharge = 0;
} else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
p->p_stats->p_ru.ru_inblock += cb->inputcharge;
cb->inputcharge = 0;
}
aio_free_entry(cb);
suword(&uaiocb->_aiocb_private.error, error);
suword(&uaiocb->_aiocb_private.status, status);
error = 0;
} else
error = EINVAL;
PROC_UNLOCK(p);
return (error);
}
/*
* Allow a process to wakeup when any of the I/O requests are completed.
*/
int
aio_suspend(struct thread *td, struct aio_suspend_args *uap)
{
struct proc *p = td->td_proc;
struct timeval atv;
struct timespec ts;
struct aiocb *const *cbptr, *cbp;
struct kaioinfo *ki;
struct aiocblist *cb, *cbfirst;
struct aiocb **ujoblist;
int njoblist;
int error;
int timo;
int i;
if (uap->nent < 0 || uap->nent > AIO_LISTIO_MAX)
return (EINVAL);
timo = 0;
if (uap->timeout) {
/* Get timespec struct. */
if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
return (error);
if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
return (EINVAL);
TIMESPEC_TO_TIMEVAL(&atv, &ts);
if (itimerfix(&atv))
return (EINVAL);
timo = tvtohz(&atv);
}
ki = p->p_aioinfo;
if (ki == NULL)
return (EAGAIN);
njoblist = 0;
ujoblist = uma_zalloc(aiol_zone, M_WAITOK);
cbptr = uap->aiocbp;
for (i = 0; i < uap->nent; i++) {
cbp = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
if (cbp == 0)
continue;
ujoblist[njoblist] = cbp;
njoblist++;
}
if (njoblist == 0) {
uma_zfree(aiol_zone, ujoblist);
return (0);
}
PROC_LOCK(p);
for (;;) {
cbfirst = NULL;
error = 0;
TAILQ_FOREACH(cb, &ki->kaio_all, allist) {
for (i = 0; i < njoblist; i++) {
if (cb->uuaiocb == ujoblist[i]) {
if (cbfirst == NULL)
cbfirst = cb;
if (cb->jobstate == JOBST_JOBFINISHED)
goto RETURN;
}
}
}
/* All tasks were finished. */
if (cbfirst == NULL)
break;
ki->kaio_flags |= KAIO_WAKEUP;
error = msleep(&p->p_aioinfo, &p->p_mtx, PRIBIO | PCATCH,
"aiospn", timo);
if (error == ERESTART)
error = EINTR;
if (error)
break;
}
RETURN:
PROC_UNLOCK(p);
uma_zfree(aiol_zone, ujoblist);
return (error);
}
/*
* aio_cancel cancels any non-physio aio operations not currently in
* progress.
*/
int
aio_cancel(struct thread *td, struct aio_cancel_args *uap)
{
struct proc *p = td->td_proc;
struct kaioinfo *ki;
struct aiocblist *cbe, *cbn;
struct file *fp;
struct socket *so;
int error;
int cancelled = 0;
int notcancelled = 0;
struct vnode *vp;
/* Lookup file object. */
error = fget(td, uap->fd, &fp);
if (error)
return (error);
ki = p->p_aioinfo;
if (ki == NULL)
goto done;
if (fp->f_type == DTYPE_VNODE) {
vp = fp->f_vnode;
if (vn_isdisk(vp, &error)) {
fdrop(fp, td);
td->td_retval[0] = AIO_NOTCANCELED;
return (0);
}
} else if (fp->f_type == DTYPE_SOCKET) {
so = fp->f_data;
mtx_lock(&aio_sock_mtx);
TAILQ_FOREACH_SAFE(cbe, &so->so_aiojobq, list, cbn) {
if (cbe->userproc == p &&
(uap->aiocbp == NULL ||
uap->aiocbp == cbe->uuaiocb)) {
TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
PROC_LOCK(p);
TAILQ_REMOVE(&ki->kaio_sockqueue, cbe, plist);
cbe->jobstate = JOBST_JOBRUNNING;
cbe->uaiocb._aiocb_private.status = -1;
cbe->uaiocb._aiocb_private.error = ECANCELED;
aio_bio_done_notify(p, cbe, DONE_QUEUE);
PROC_UNLOCK(p);
cancelled++;
if (uap->aiocbp != NULL)
break;
}
}
mtx_unlock(&aio_sock_mtx);
if (cancelled && uap->aiocbp != NULL) {
fdrop(fp, td);
td->td_retval[0] = AIO_CANCELED;
return (0);
}
}
PROC_LOCK(p);
TAILQ_FOREACH_SAFE(cbe, &ki->kaio_jobqueue, plist, cbn) {
if ((uap->fd == cbe->uaiocb.aio_fildes) &&
((uap->aiocbp == NULL) ||
(uap->aiocbp == cbe->uuaiocb))) {
mtx_lock(&aio_job_mtx);
if (cbe->jobstate == JOBST_JOBQGLOBAL) {
TAILQ_REMOVE(&aio_jobs, cbe, list);
mtx_unlock(&aio_job_mtx);
TAILQ_REMOVE(&ki->kaio_jobqueue, cbe, plist);
cbe->uaiocb._aiocb_private.status = -1;
cbe->uaiocb._aiocb_private.error = ECANCELED;
aio_bio_done_notify(p, cbe, DONE_QUEUE);
cancelled++;
} else {
mtx_unlock(&aio_job_mtx);
notcancelled++;
}
}
}
PROC_UNLOCK(p);
done:
fdrop(fp, td);
if (notcancelled) {
td->td_retval[0] = AIO_NOTCANCELED;
return (0);
}
if (cancelled) {
td->td_retval[0] = AIO_CANCELED;
return (0);
}
td->td_retval[0] = AIO_ALLDONE;
return (0);
}
/*
* aio_error is implemented in the kernel level for compatibility purposes only.
* For a user mode async implementation, it would be best to do it in a userland
* subroutine.
*/
int
aio_error(struct thread *td, struct aio_error_args *uap)
{
struct proc *p = td->td_proc;
struct aiocblist *cb;
struct kaioinfo *ki;
int status;
ki = p->p_aioinfo;
if (ki == NULL) {
td->td_retval[0] = EINVAL;
return (0);
}
PROC_LOCK(p);
TAILQ_FOREACH(cb, &ki->kaio_all, allist) {
if (cb->uuaiocb == uap->aiocbp) {
if (cb->jobstate == JOBST_JOBFINISHED)
td->td_retval[0] =
cb->uaiocb._aiocb_private.error;
else
td->td_retval[0] = EINPROGRESS;
PROC_UNLOCK(p);
return (0);
}
}
PROC_UNLOCK(p);
/*
* Hack for failure of aio_aqueue.
*/
status = fuword(&uap->aiocbp->_aiocb_private.status);
if (status == -1) {
td->td_retval[0] = fuword(&uap->aiocbp->_aiocb_private.error);
return (0);
}
td->td_retval[0] = EINVAL;
return (0);
}
/* syscall - asynchronous read from a file (REALTIME) */
int
oaio_read(struct thread *td, struct oaio_read_args *uap)
{
return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 1);
}
int
aio_read(struct thread *td, struct aio_read_args *uap)
{
return aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, 0);
}
/* syscall - asynchronous write to a file (REALTIME) */
int
oaio_write(struct thread *td, struct oaio_write_args *uap)
{
return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 1);
}
int
aio_write(struct thread *td, struct aio_write_args *uap)
{
return aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, 0);
}
/* syscall - list directed I/O (REALTIME) */
int
olio_listio(struct thread *td, struct olio_listio_args *uap)
{
return do_lio_listio(td, (struct lio_listio_args *)uap, 1);
}
/* syscall - list directed I/O (REALTIME) */
int
lio_listio(struct thread *td, struct lio_listio_args *uap)
{
return do_lio_listio(td, uap, 0);
}
static int
do_lio_listio(struct thread *td, struct lio_listio_args *uap, int oldsigev)
{
struct proc *p = td->td_proc;
struct aiocb *iocb, * const *cbptr;
struct kaioinfo *ki;
struct aioliojob *lj;
struct kevent kev;
struct kqueue * kq;
struct file *kq_fp;
int nent;
int error;
int nerror;
int i;
if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
return (EINVAL);
nent = uap->nent;
if (nent < 0 || nent > AIO_LISTIO_MAX)
return (EINVAL);
if (p->p_aioinfo == NULL)
aio_init_aioinfo(p);
ki = p->p_aioinfo;
lj = uma_zalloc(aiolio_zone, M_WAITOK);
lj->lioj_flags = 0;
lj->lioj_count = 0;
lj->lioj_finished_count = 0;
knlist_init(&lj->klist, &p->p_mtx, NULL, NULL, NULL);
ksiginfo_init(&lj->lioj_ksi);
/*
* Setup signal.
*/
if (uap->sig && (uap->mode == LIO_NOWAIT)) {
bzero(&lj->lioj_signal, sizeof(&lj->lioj_signal));
error = copyin(uap->sig, &lj->lioj_signal,
oldsigev ? sizeof(struct osigevent) :
sizeof(struct sigevent));
if (error) {
uma_zfree(aiolio_zone, lj);
return (error);
}
if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
/* Assume only new style KEVENT */
error = fget(td, lj->lioj_signal.sigev_notify_kqueue,
&kq_fp);
if (error) {
uma_zfree(aiolio_zone, lj);
return (error);
}
if (kq_fp->f_type != DTYPE_KQUEUE) {
fdrop(kq_fp, td);
uma_zfree(aiolio_zone, lj);
return (EBADF);
}
kq = (struct kqueue *)kq_fp->f_data;
kev.filter = EVFILT_LIO;
kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
kev.ident = (uintptr_t)lj; /* something unique */
kev.data = (intptr_t)lj;
/* pass user defined sigval data */
kev.udata = lj->lioj_signal.sigev_value.sival_ptr;
error = kqueue_register(kq, &kev, td, 1);
fdrop(kq_fp, td);
if (error) {
uma_zfree(aiolio_zone, lj);
return (error);
}
} else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) {
;
} else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) {
if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
uma_zfree(aiolio_zone, lj);
return EINVAL;
}
lj->lioj_flags |= LIOJ_SIGNAL;
} else {
uma_zfree(aiolio_zone, lj);
return EINVAL;
}
}
PROC_LOCK(p);
TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
/*
* Add extra aiocb count to avoid the lio to be freed
* by other threads doing aio_waitcomplete or aio_return,
* and prevent event from being sent until we have queued
* all tasks.
*/
lj->lioj_count = 1;
PROC_UNLOCK(p);
/*
* Get pointers to the list of I/O requests.
*/
nerror = 0;
cbptr = uap->acb_list;
for (i = 0; i < uap->nent; i++) {
iocb = (struct aiocb *)(intptr_t)fuword(&cbptr[i]);
if (((intptr_t)iocb != -1) && ((intptr_t)iocb != 0)) {
error = aio_aqueue(td, iocb, lj, 0, oldsigev);
if (error != 0)
nerror++;
}
}
error = 0;
PROC_LOCK(p);
if (uap->mode == LIO_WAIT) {
while (lj->lioj_count - 1 != lj->lioj_finished_count) {
ki->kaio_flags |= KAIO_WAKEUP;
error = msleep(&p->p_aioinfo, &p->p_mtx,
PRIBIO | PCATCH, "aiospn", 0);
if (error == ERESTART)
error = EINTR;
if (error)
break;
}
} else {
if (lj->lioj_count - 1 == lj->lioj_finished_count) {
if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
lj->lioj_flags |= LIOJ_KEVENT_POSTED;
KNOTE_LOCKED(&lj->klist, 1);
}
if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
== LIOJ_SIGNAL
&& (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
aio_sendsig(p, &lj->lioj_signal,
&lj->lioj_ksi);
lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
}
}
}
lj->lioj_count--;
if (lj->lioj_count == 0) {
TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
knlist_delete(&lj->klist, curthread, 1);
sigqueue_take(&lj->lioj_ksi);
PROC_UNLOCK(p);
uma_zfree(aiolio_zone, lj);
} else
PROC_UNLOCK(p);
if (nerror)
return (EIO);
return (error);
}
/*
* Called from interrupt thread for physio, we should return as fast
* as possible, so we schedule a biohelper task.
*/
static void
aio_physwakeup(struct buf *bp)
{
struct aiocblist *aiocbe;
aiocbe = (struct aiocblist *)bp->b_caller1;
taskqueue_enqueue(taskqueue_aiod_bio, &aiocbe->biotask);
}
/*
* Task routine to perform heavy tasks, process wakeup, and signals.
*/
static void
biohelper(void *context, int pending)
{
struct aiocblist *aiocbe = context;
struct buf *bp;
struct proc *userp;
int nblks;
bp = aiocbe->bp;
userp = aiocbe->userproc;
PROC_LOCK(userp);
aiocbe->uaiocb._aiocb_private.status -= bp->b_resid;
aiocbe->uaiocb._aiocb_private.error = 0;
if (bp->b_ioflags & BIO_ERROR)
aiocbe->uaiocb._aiocb_private.error = bp->b_error;
nblks = btodb(aiocbe->uaiocb.aio_nbytes);
if (aiocbe->uaiocb.aio_lio_opcode == LIO_WRITE)
aiocbe->outputcharge += nblks;
else
aiocbe->inputcharge += nblks;
aiocbe->bp = NULL;
TAILQ_REMOVE(&userp->p_aioinfo->kaio_bufqueue, aiocbe, plist);
aio_bio_done_notify(userp, aiocbe, DONE_BUF);
PROC_UNLOCK(userp);
/* Release mapping into kernel space. */
vunmapbuf(bp);
relpbuf(bp, NULL);
atomic_subtract_int(&num_buf_aio, 1);
}
/* syscall - wait for the next completion of an aio request */
int
aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap)
{
struct proc *p = td->td_proc;
struct timeval atv;
struct timespec ts;
struct kaioinfo *ki;
struct aiocblist *cb;
struct aiocb *uuaiocb;
int error, status, timo;
suword(uap->aiocbp, (long)NULL);
timo = 0;
if (uap->timeout) {
/* Get timespec struct. */
error = copyin(uap->timeout, &ts, sizeof(ts));
if (error)
return (error);
if ((ts.tv_nsec < 0) || (ts.tv_nsec >= 1000000000))
return (EINVAL);
TIMESPEC_TO_TIMEVAL(&atv, &ts);
if (itimerfix(&atv))
return (EINVAL);
timo = tvtohz(&atv);
}
if (p->p_aioinfo == NULL)
aio_init_aioinfo(p);
ki = p->p_aioinfo;
error = 0;
cb = NULL;
PROC_LOCK(p);
while ((cb = TAILQ_FIRST(&ki->kaio_done)) == NULL) {
ki->kaio_flags |= KAIO_WAKEUP;
error = msleep(&p->p_aioinfo, &p->p_mtx, PRIBIO | PCATCH,
"aiowc", timo);
if (error == ERESTART)
error = EINTR;
if (error)
break;
}
if (cb != NULL) {
MPASS(cb->jobstate == JOBST_JOBFINISHED);
uuaiocb = cb->uuaiocb;
status = cb->uaiocb._aiocb_private.status;
error = cb->uaiocb._aiocb_private.error;
td->td_retval[0] = status;
if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
p->p_stats->p_ru.ru_oublock += cb->outputcharge;
cb->outputcharge = 0;
} else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
p->p_stats->p_ru.ru_inblock += cb->inputcharge;
cb->inputcharge = 0;
}
aio_free_entry(cb);
PROC_UNLOCK(p);
suword(uap->aiocbp, (long)uuaiocb);
suword(&uuaiocb->_aiocb_private.error, error);
suword(&uuaiocb->_aiocb_private.status, status);
} else
PROC_UNLOCK(p);
return (error);
}
/* kqueue attach function */
static int
filt_aioattach(struct knote *kn)
{
struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
/*
* The aiocbe pointer must be validated before using it, so
* registration is restricted to the kernel; the user cannot
* set EV_FLAG1.
*/
if ((kn->kn_flags & EV_FLAG1) == 0)
return (EPERM);
kn->kn_flags &= ~EV_FLAG1;
knlist_add(&aiocbe->klist, kn, 0);
return (0);
}
/* kqueue detach function */
static void
filt_aiodetach(struct knote *kn)
{
struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
if (!knlist_empty(&aiocbe->klist))
knlist_remove(&aiocbe->klist, kn, 0);
}
/* kqueue filter function */
/*ARGSUSED*/
static int
filt_aio(struct knote *kn, long hint)
{
struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
kn->kn_data = aiocbe->uaiocb._aiocb_private.error;
if (aiocbe->jobstate != JOBST_JOBFINISHED)
return (0);
kn->kn_flags |= EV_EOF;
return (1);
}
/* kqueue attach function */
static int
filt_lioattach(struct knote *kn)
{
struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata;
/*
* The aioliojob pointer must be validated before using it, so
* registration is restricted to the kernel; the user cannot
* set EV_FLAG1.
*/
if ((kn->kn_flags & EV_FLAG1) == 0)
return (EPERM);
kn->kn_flags &= ~EV_FLAG1;
knlist_add(&lj->klist, kn, 0);
return (0);
}
/* kqueue detach function */
static void
filt_liodetach(struct knote *kn)
{
struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata;
if (!knlist_empty(&lj->klist))
knlist_remove(&lj->klist, kn, 0);
}
/* kqueue filter function */
/*ARGSUSED*/
static int
filt_lio(struct knote *kn, long hint)
{
struct aioliojob * lj = (struct aioliojob *)kn->kn_sdata;
return (lj->lioj_flags & LIOJ_KEVENT_POSTED);
}
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