* of the author. This software is distributed AS-IS.
*
* $FreeBSD: src/sys/kern/vfs_aio.c,v 1.70.2.28 2003/05/29 06:15:35 alc Exp $
- * $DragonFly: src/sys/kern/vfs_aio.c,v 1.42 2007/07/20 17:21:52 dillon Exp $
*/
/*
- * This file contains support for the POSIX 1003.1B AIO/LIO facility.
+ * This file contains stubs for the POSIX 1003.1B AIO/LIO facility.
*/
#include <sys/param.h>
#include <sys/buf2.h>
#include <sys/sysref2.h>
#include <sys/thread2.h>
-#include <sys/mplock2.h>
#include <machine/limits.h>
-#include "opt_vfs_aio.h"
-#ifdef VFS_AIO
-
-/*
- * Counter for allocating reference ids to new jobs. Wrapped to 1 on
- * overflow.
- */
-static long jobrefid;
-
-#define JOBST_NULL 0x0
-#define JOBST_JOBQGLOBAL 0x2
-#define JOBST_JOBRUNNING 0x3
-#define JOBST_JOBFINISHED 0x4
-#define JOBST_JOBQBUF 0x5
-#define JOBST_JOBBFINISHED 0x6
-
-#ifndef MAX_AIO_PER_PROC
-#define MAX_AIO_PER_PROC 32
-#endif
-
-#ifndef MAX_AIO_QUEUE_PER_PROC
-#define MAX_AIO_QUEUE_PER_PROC 256 /* Bigger than AIO_LISTIO_MAX */
-#endif
-
-#ifndef MAX_AIO_PROCS
-#define MAX_AIO_PROCS 32
-#endif
-
-#ifndef MAX_AIO_QUEUE
-#define MAX_AIO_QUEUE 1024 /* Bigger than AIO_LISTIO_MAX */
-#endif
-
-#ifndef TARGET_AIO_PROCS
-#define TARGET_AIO_PROCS 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
-
-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 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)");
-
-/*
- * AIO process info
- */
-#define AIOP_FREE 0x1 /* proc on free queue */
-#define AIOP_SCHED 0x2 /* proc explicitly scheduled */
-
-struct aioproclist {
- int aioprocflags; /* AIO proc flags */
- TAILQ_ENTRY(aioproclist) list; /* List of processes */
- struct proc *aioproc; /* The AIO thread */
-};
-
-/*
- * data-structure for lio signal management
- */
-struct aio_liojob {
- int lioj_flags;
- int lioj_buffer_count;
- int lioj_buffer_finished_count;
- int lioj_queue_count;
- int lioj_queue_finished_count;
- struct sigevent lioj_signal; /* signal on all I/O done */
- TAILQ_ENTRY(aio_liojob) lioj_list;
- struct kaioinfo *lioj_ki;
-};
-#define LIOJ_SIGNAL 0x1 /* signal on all done (lio) */
-#define LIOJ_SIGNAL_POSTED 0x2 /* signal has been posted */
-
-/*
- * per process aio data structure
- */
-struct kaioinfo {
- int kaio_flags; /* per process kaio flags */
- int kaio_maxactive_count; /* maximum number of AIOs */
- int kaio_active_count; /* number of currently used AIOs */
- int kaio_qallowed_count; /* maxiumu size of AIO queue */
- int kaio_queue_count; /* size of AIO queue */
- int kaio_ballowed_count; /* maximum number of buffers */
- int kaio_queue_finished_count; /* number of daemon jobs finished */
- int kaio_buffer_count; /* number of physio buffers */
- int kaio_buffer_finished_count; /* count of I/O done */
- struct proc *kaio_p; /* process that uses this kaio block */
- TAILQ_HEAD(,aio_liojob) kaio_liojoblist; /* list of lio jobs */
- TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* job queue for process */
- TAILQ_HEAD(,aiocblist) kaio_jobdone; /* done queue for process */
- TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* buffer job queue for process */
- TAILQ_HEAD(,aiocblist) kaio_bufdone; /* buffer done queue for process */
- 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(,aioproclist) aio_freeproc, aio_activeproc;
-static TAILQ_HEAD(,aiocblist) aio_jobs; /* Async job list */
-static TAILQ_HEAD(,aiocblist) aio_bufjobs; /* Phys I/O job list */
-static TAILQ_HEAD(,aiocblist) aio_freejobs; /* Pool of free jobs */
-
-static void aio_init_aioinfo(struct proc *p);
-static void aio_onceonly(void *);
-static int aio_free_entry(struct aiocblist *aiocbe);
-static void aio_process(struct aiocblist *aiocbe);
-static int aio_newproc(void);
-static int aio_aqueue(struct aiocb *job, int type);
-static void aio_physwakeup(struct bio *bio);
-static int aio_fphysio(struct aiocblist *aiocbe);
-static int aio_qphysio(struct proc *p, struct aiocblist *iocb);
-static void aio_daemon(void *uproc, struct trapframe *frame);
-static void process_signal(void *aioj);
-
-SYSINIT(aio, SI_SUB_VFS, SI_ORDER_ANY, aio_onceonly, NULL);
-
-/*
- * 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 struct objcache *kaio_oc, *aiop_oc, *aiocb_oc, *aiol_oc, *aiolio_oc;
-
-static MALLOC_DEFINE(M_AIO, "AIO", "AIO");
-static MALLOC_DEFINE(M_AIOP, "AIO proc", "AIO process");
-static MALLOC_DEFINE(M_AIOCB, "AIO cb", "AIO cb");
-static MALLOC_DEFINE(M_AIOL, "AIO list io", "AIO list io");
-static MALLOC_DEFINE(M_AIOLIO, "AIO list io job", "AIO list io job");
-
-/*
- * Startup initialization
- */
-static void
-aio_onceonly(void *na)
-{
- TAILQ_INIT(&aio_freeproc);
- TAILQ_INIT(&aio_activeproc);
- TAILQ_INIT(&aio_jobs);
- TAILQ_INIT(&aio_bufjobs);
- TAILQ_INIT(&aio_freejobs);
- kaio_oc = objcache_create_simple(M_AIO, sizeof(struct kaioinfo));
- aiop_oc = objcache_create_simple(M_AIOP, sizeof(struct aioproclist));
- aiocb_oc = objcache_create_simple(M_AIOCB, sizeof(struct aiocblist));
- aiol_oc = objcache_create_simple(M_AIOL, AIO_LISTIO_MAX*sizeof(intptr_t));
- aiolio_oc = objcache_create_simple(M_AIOLIO, sizeof(struct aio_liojob));
- aiod_timeout = AIOD_TIMEOUT_DEFAULT;
- aiod_lifetime = AIOD_LIFETIME_DEFAULT;
- jobrefid = 1;
-}
-
-/*
- * Init the per-process aioinfo structure. The aioinfo limits are set
- * per-process for user limit (resource) management.
- */
-static void
-aio_init_aioinfo(struct proc *p)
-{
- struct kaioinfo *ki;
- if (p->p_aioinfo == NULL) {
- ki = objcache_get(kaio_oc, M_WAITOK);
- p->p_aioinfo = ki;
- ki->kaio_flags = 0;
- ki->kaio_maxactive_count = max_aio_per_proc;
- ki->kaio_active_count = 0;
- ki->kaio_qallowed_count = max_aio_queue_per_proc;
- ki->kaio_queue_count = 0;
- ki->kaio_ballowed_count = max_buf_aio;
- ki->kaio_buffer_count = 0;
- ki->kaio_buffer_finished_count = 0;
- ki->kaio_p = p;
- TAILQ_INIT(&ki->kaio_jobdone);
- TAILQ_INIT(&ki->kaio_jobqueue);
- TAILQ_INIT(&ki->kaio_bufdone);
- TAILQ_INIT(&ki->kaio_bufqueue);
- TAILQ_INIT(&ki->kaio_liojoblist);
- TAILQ_INIT(&ki->kaio_sockqueue);
- }
-
- while (num_aio_procs < target_aio_procs)
- aio_newproc();
-}
-
-/*
- * 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 aio_liojob *lj;
- struct proc *p;
- int error;
-
- if (aiocbe->jobstate == JOBST_NULL)
- panic("aio_free_entry: freeing already free job");
-
- p = aiocbe->userproc;
- ki = p->p_aioinfo;
- lj = aiocbe->lio;
- if (ki == NULL)
- panic("aio_free_entry: missing p->p_aioinfo");
-
- while (aiocbe->jobstate == JOBST_JOBRUNNING) {
- aiocbe->jobflags |= AIOCBLIST_RUNDOWN;
- tsleep(aiocbe, 0, "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 */
- /* XXX lwp knote wants a thread, but only cares about the process */
- knote_empty(&aiocbe->klist);
-
- 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");
- crit_enter();
- TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist);
- crit_exit();
- } else if (aiocbe->jobstate == JOBST_JOBQGLOBAL) {
- crit_enter();
- TAILQ_REMOVE(&aio_jobs, aiocbe, list);
- TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
- crit_exit();
- } else if (aiocbe->jobstate == JOBST_JOBFINISHED)
- TAILQ_REMOVE(&ki->kaio_jobdone, aiocbe, plist);
- else if (aiocbe->jobstate == JOBST_JOBBFINISHED) {
- crit_enter();
- TAILQ_REMOVE(&ki->kaio_bufdone, aiocbe, plist);
- crit_exit();
- 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);
- objcache_put(aiolio_oc, lj);
- }
- aiocbe->jobstate = JOBST_NULL;
- callout_stop(&aiocbe->timeout);
- fdrop(aiocbe->fd_file);
- TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
- return 0;
-}
-#endif /* VFS_AIO */
-
-/*
- * Rundown the jobs for a given process.
- */
-void
-aio_proc_rundown(struct proc *p)
-{
-#ifndef VFS_AIO
- return;
-#else
- 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, 0, "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.
- */
- crit_enter();
- for (aiocbe = TAILQ_FIRST(&ki->kaio_sockqueue); aiocbe; aiocbe =
- aiocbn) {
- aiocbn = TAILQ_NEXT(aiocbe, plist);
- fp = aiocbe->fd_file;
- if (fp != NULL) {
- so = (struct socket *)fp->f_data;
- TAILQ_REMOVE(&so->so_aiojobq, aiocbe, list);
- if (TAILQ_EMPTY(&so->so_aiojobq)) {
- atomic_clear_int(&so->so_snd.ssb_flags,
- SSB_AIO);
- atomic_clear_int(&so->so_rcv.ssb_flags,
- SSB_AIO);
- }
- }
- TAILQ_REMOVE(&ki->kaio_sockqueue, aiocbe, plist);
- TAILQ_INSERT_HEAD(&aio_jobs, aiocbe, list);
- TAILQ_INSERT_HEAD(&ki->kaio_jobqueue, aiocbe, plist);
- }
- crit_exit();
-
-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;
- }
-
-restart3:
- crit_enter();
- while (TAILQ_FIRST(&ki->kaio_bufqueue)) {
- ki->kaio_flags |= KAIO_WAKEUP;
- tsleep(p, 0, "aioprn", 0);
- crit_exit();
- goto restart3;
- }
- crit_exit();
-
-restart4:
- crit_enter();
- for (aiocbe = TAILQ_FIRST(&ki->kaio_bufdone); aiocbe; aiocbe = aiocbn) {
- aiocbn = TAILQ_NEXT(aiocbe, plist);
- if (aio_free_entry(aiocbe)) {
- crit_exit();
- goto restart4;
- }
- }
- crit_exit();
-
- /*
- * 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);
- objcache_put(aiolio_oc, lj);
- } else {
-#ifdef DIAGNOSTIC
- kprintf("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
- }
- }
-
- objcache_put(kaio_oc, ki);
- p->p_aioinfo = NULL;
-#endif /* VFS_AIO */
-}
-
-#ifdef VFS_AIO
-/*
- * Select a job to run (called by an AIO daemon).
- */
-static struct aiocblist *
-aio_selectjob(struct aioproclist *aiop)
-{
- struct aiocblist *aiocbe;
- struct kaioinfo *ki;
- struct proc *userp;
-
- crit_enter();
- 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);
- crit_exit();
- return aiocbe;
- }
- }
- crit_exit();
-
- 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 thread *mytd;
- 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;
-
- mytd = curthread;
- 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 = mytd;
-
- inblock_st = mytd->td_lwp->lwp_ru.ru_inblock;
- oublock_st = mytd->td_lwp->lwp_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, O_FOFFSET);
- } else {
- auio.uio_rw = UIO_WRITE;
- error = fo_write(fp, &auio, fp->f_cred, O_FOFFSET);
- }
- inblock_end = mytd->td_lwp->lwp_ru.ru_inblock;
- oublock_end = mytd->td_lwp->lwp_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))
- ksignal(aiocbe->userproc, SIGPIPE);
- }
-
- cnt -= auio.uio_resid;
- cb->_aiocb_private.error = error;
- cb->_aiocb_private.status = cnt;
-}
-
-/*
- * 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, struct trapframe *frame)
-{
- struct aio_liojob *lj;
- struct aiocb *cb;
- struct aiocblist *aiocbe;
- struct aioproclist *aiop;
- struct kaioinfo *ki;
- struct proc *mycp, *userp;
- struct vmspace *curvm;
- struct lwp *mylwp;
- struct ucred *cr;
-
- /*
- * mplock not held on entry but we aren't mpsafe yet.
- */
- get_mplock();
-
- mylwp = curthread->td_lwp;
- mycp = mylwp->lwp_proc;
-
- if (mycp->p_textvp) {
- vrele(mycp->p_textvp);
- mycp->p_textvp = NULL;
- }
-
- /*
- * Allocate and ready the aio control info. There is one aiop structure
- * per daemon.
- */
- aiop = objcache_get(aiop_oc, M_WAITOK);
- aiop->aioproc = mycp;
- aiop->aioprocflags |= AIOP_FREE;
-
- crit_enter();
-
- /*
- * 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);
-
- crit_exit();
-
- /* Make up a name for the daemon. */
- strcpy(mycp->p_comm, "aiod");
-
- /*
- * Get rid of our current filedescriptors. AIOD's don't need any
- * filedescriptors, except as temporarily inherited from the client.
- * Credentials are also cloned, and made equivalent to "root".
- */
- fdfree(mycp, NULL);
- cr = cratom(&mycp->p_ucred);
- cr->cr_uid = 0;
- uireplace(&cr->cr_uidinfo, uifind(0));
- cr->cr_ngroups = 1;
- cr->cr_groups[0] = 1;
-
- /* The daemon resides in its own pgrp. */
- enterpgrp(mycp, mycp->p_pid, 1);
-
- /* Mark special process type. */
- mycp->p_flag |= P_SYSTEM | P_KTHREADP;
-
- /*
- * Wakeup parent process. (Parent sleeps to keep from blasting away
- * and creating too many daemons.)
- */
- wakeup(mycp);
- curvm = NULL;
-
- for (;;) {
- /*
- * Take daemon off of free queue
- */
- if (aiop->aioprocflags & AIOP_FREE) {
- crit_enter();
- TAILQ_REMOVE(&aio_freeproc, aiop, list);
- TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
- aiop->aioprocflags &= ~AIOP_FREE;
- crit_exit();
- }
- aiop->aioprocflags &= ~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 (curvm != userp->p_vmspace) {
- pmap_setlwpvm(mylwp, userp->p_vmspace);
- if (curvm)
- sysref_put(&curvm->vm_sysref);
- curvm = userp->p_vmspace;
- sysref_get(&curvm->vm_sysref);
- }
-
- 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);
- }
-
- crit_enter();
- 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)) {
- ksignal(userp,
- lj->lioj_signal.sigev_signo);
- lj->lioj_flags |=
- LIOJ_SIGNAL_POSTED;
- }
- }
- crit_exit();
-
- aiocbe->jobstate = JOBST_JOBFINISHED;
-
- crit_enter();
- TAILQ_REMOVE(&ki->kaio_jobqueue, aiocbe, plist);
- TAILQ_INSERT_TAIL(&ki->kaio_jobdone, aiocbe, plist);
- crit_exit();
- KNOTE(&aiocbe->klist, 0);
-
- if (aiocbe->jobflags & AIOCBLIST_RUNDOWN) {
- wakeup(aiocbe);
- aiocbe->jobflags &= ~AIOCBLIST_RUNDOWN;
- }
-
- if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
- ksignal(userp, cb->aio_sigevent.sigev_signo);
- }
- }
-
- /*
- * Disconnect from user address space.
- */
- if (curvm) {
- /* swap our original address space back in */
- pmap_setlwpvm(mylwp, mycp->p_vmspace);
- sysref_put(&curvm->vm_sysref);
- curvm = NULL;
- }
-
- /*
- * If we are the first to be put onto the free queue, wakeup
- * anyone waiting for a daemon.
- */
- crit_enter();
- TAILQ_REMOVE(&aio_activeproc, aiop, list);
- if (TAILQ_EMPTY(&aio_freeproc))
- wakeup(&aio_freeproc);
- TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
- aiop->aioprocflags |= AIOP_FREE;
- crit_exit();
-
- /*
- * If daemon is inactive for a long time, allow it to exit,
- * thereby freeing resources.
- */
- if (((aiop->aioprocflags & AIOP_SCHED) == 0) && tsleep(mycp,
- 0, "aiordy", aiod_lifetime)) {
- crit_enter();
- if (TAILQ_EMPTY(&aio_jobs)) {
- if ((aiop->aioprocflags & AIOP_FREE) &&
- (num_aio_procs > target_aio_procs)) {
- TAILQ_REMOVE(&aio_freeproc, aiop, list);
- crit_exit();
- objcache_put(aiop_oc, aiop);
- num_aio_procs--;
-#ifdef DIAGNOSTIC
- if (mycp->p_vmspace->vm_sysref.refcnt <= 1) {
- kprintf("AIOD: bad vm refcnt for"
- " exiting daemon: %d\n",
- mycp->p_vmspace->vm_sysref.refcnt);
- }
-#endif
- exit1(0);
- }
- }
- crit_exit();
- }
- }
-}
-
-/*
- * 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 lwp *lp, *nlp;
- struct proc *np;
-
- lp = &lwp0;
- error = fork1(lp, RFPROC|RFMEM|RFNOWAIT, &np);
- if (error)
- return error;
- nlp = ONLY_LWP_IN_PROC(np);
- cpu_set_fork_handler(nlp, aio_daemon, curproc);
- start_forked_proc(lp, np);
-
- /*
- * Wait until daemon is started, but continue on just in case to
- * handle error conditions.
- */
- error = tsleep(np, 0, "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 notify;
-
- cb = &aiocbe->uaiocb;
- fp = aiocbe->fd_file;
-
- if (fp->f_type != DTYPE_VNODE)
- return (-1);
-
- vp = (struct vnode *)fp->f_data;
-
- /*
- * 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 = getpbuf_kva(NULL);
- BUF_KERNPROC(bp);
-
- /*
- * Get a copy of the kva from the physical buffer.
- */
- bp->b_bio1.bio_caller_info1.ptr = p;
- error = 0;
-
- bp->b_cmd = (cb->aio_lio_opcode == LIO_WRITE) ?
- BUF_CMD_WRITE : BUF_CMD_READ;
- bp->b_bio1.bio_done = aio_physwakeup;
- bp->b_bio1.bio_flags |= BIO_SYNC;
- bp->b_bio1.bio_offset = cb->aio_offset;
-
- /* Bring buffer into kernel space. */
- if (vmapbuf(bp, __DEVOLATILE(char *, cb->aio_buf), cb->aio_nbytes) < 0) {
- error = EFAULT;
- goto doerror;
- }
-
- crit_enter();
-
- aiocbe->bp = bp;
- bp->b_bio1.bio_caller_info2.ptr = 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;
-
- crit_exit();
-
- /*
- * Perform the transfer. vn_strategy must be used even though we
- * know we have a device in order to deal with requests which exceed
- * device DMA limitations.
- */
- vn_strategy(vp, &bp->b_bio1);
-
- notify = 0;
- crit_enter();
-
-#if 0
- /*
- * If we had an error invoking the request, or an error in processing
- * the request before we have returned, we process it as an error in
- * transfer. Note that such an I/O error is not indicated immediately,
- * but is returned using the aio_error mechanism. In this case,
- * aio_suspend will return immediately.
- */
- if (bp->b_error || (bp->b_flags & B_ERROR)) {
- struct aiocb *job = aiocbe->uuaiocb;
-
- aiocbe->uaiocb._aiocb_private.status = 0;
- suword(&job->_aiocb_private.status, 0);
- aiocbe->uaiocb._aiocb_private.error = bp->b_error;
- suword(&job->_aiocb_private.error, bp->b_error);
-
- ki->kaio_buffer_finished_count++;
-
- if (aiocbe->jobstate != JOBST_JOBBFINISHED) {
- aiocbe->jobstate = JOBST_JOBBFINISHED;
- aiocbe->jobflags |= AIOCBLIST_DONE;
- TAILQ_REMOVE(&aio_bufjobs, aiocbe, list);
- TAILQ_REMOVE(&ki->kaio_bufqueue, aiocbe, plist);
- TAILQ_INSERT_TAIL(&ki->kaio_bufdone, aiocbe, plist);
- notify = 1;
- }
- }
-#endif
- crit_exit();
- 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)
-{
- struct buf *bp;
- int error;
-
- bp = iocb->bp;
-
- error = biowait_timeout(&bp->b_bio1, "physstr", aiod_timeout);
- if (error == EWOULDBLOCK)
- return EINPROGRESS;
-
- /* Release mapping into kernel space. */
- vunmapbuf(bp);
- iocb->bp = 0;
-
- error = 0;
-
- /* Check for an error. */
- if (bp->b_flags & B_ERROR)
- error = bp->b_error;
-
- relpbuf(bp, NULL);
- return (error);
-}
-#endif /* VFS_AIO */
-
-/*
- * Wake up aio requests that may be serviceable now.
- */
-void
-aio_swake(struct socket *so, struct signalsockbuf *ssb)
-{
-#ifndef VFS_AIO
- return;
-#else
- struct aiocblist *cb,*cbn;
- struct proc *p;
- struct kaioinfo *ki = NULL;
- int opcode, wakecount = 0;
- struct aioproclist *aiop;
-
- if (ssb == &so->so_snd) {
- opcode = LIO_WRITE;
- atomic_clear_int(&so->so_snd.ssb_flags, SSB_AIO);
- } else {
- opcode = LIO_READ;
- atomic_clear_int(&so->so_rcv.ssb_flags, SSB_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->aioprocflags &= ~AIOP_FREE;
- wakeup(aiop->aioproc);
- }
- }
-#endif /* VFS_AIO */
-}
-
-#ifdef VFS_AIO
-/*
- * Queue a new AIO request. Choosing either the threaded or direct physio VCHR
- * technique is done in this code.
- */
-static int
-_aio_aqueue(struct aiocb *job, struct aio_liojob *lj, int type)
-{
- struct proc *p = curproc;
- struct file *fp;
- unsigned int fd;
- struct socket *so;
- int error;
- int opcode, user_opcode;
- struct aiocblist *aiocbe;
- struct aioproclist *aiop;
- struct kaioinfo *ki;
- struct kevent kev;
- struct kqueue *kq;
- struct file *kq_fp;
- int fflags;
-
- if ((aiocbe = TAILQ_FIRST(&aio_freejobs)) != NULL)
- TAILQ_REMOVE(&aio_freejobs, aiocbe, list);
- else
- aiocbe = objcache_get(aiocb_oc, M_WAITOK);
-
- aiocbe->inputcharge = 0;
- aiocbe->outputcharge = 0;
- callout_init(&aiocbe->timeout);
- 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);
- TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
- return error;
- }
- if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL &&
- !_SIG_VALID(aiocbe->uaiocb.aio_sigevent.sigev_signo)) {
- TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
- 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;
-
- /*
- * Range check file descriptor.
- */
- fflags = (opcode == LIO_WRITE) ? FWRITE : FREAD;
- fd = aiocbe->uaiocb.aio_fildes;
- fp = holdfp(p->p_fd, fd, fflags);
- if (fp == NULL) {
- TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
- if (type == 0)
- suword(&job->_aiocb_private.error, EBADF);
- return EBADF;
- }
-
- aiocbe->fd_file = fp;
-
- 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);
- TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
- if (type == 0) {
- suword(&job->_aiocb_private.error, 0);
- suword(&job->_aiocb_private.status, 0);
- suword(&job->_aiocb_private.kernelinfo, 0);
- }
- return 0;
- }
- if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) {
- 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.sival_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;
- }
- kq_fp = holdfp(p->p_fd, (int)kev.ident, -1);
- if (kq_fp == NULL || kq_fp->f_type != DTYPE_KQUEUE) {
- if (kq_fp) {
- fdrop(kq_fp);
- kq_fp = NULL;
- }
- error = EBADF;
- goto aqueue_fail;
- }
- kq = (struct kqueue *)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);
- fdrop(kq_fp);
-aqueue_fail:
- if (error) {
- fdrop(fp);
- TAILQ_INSERT_HEAD(&aio_freejobs, aiocbe, list);
- 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->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 ssb_notify()
- * happens.
- */
- so = (struct socket *)fp->f_data;
- crit_enter();
- 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)
- atomic_set_int(&so->so_rcv.ssb_flags, SSB_AIO);
- else
- atomic_set_int(&so->so_snd.ssb_flags, SSB_AIO);
- aiocbe->jobstate = JOBST_JOBQGLOBAL; /* XXX */
- ki->kaio_queue_count++;
- num_queue_count++;
- crit_exit();
- error = 0;
- goto done;
- }
- crit_exit();
- }
-
- 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++;
- crit_enter();
- TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, aiocbe, plist);
- TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
- crit_exit();
- 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 successfully 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.
- */
- crit_enter();
-retryproc:
- if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
- TAILQ_REMOVE(&aio_freeproc, aiop, list);
- TAILQ_INSERT_TAIL(&aio_activeproc, aiop, list);
- aiop->aioprocflags &= ~AIOP_FREE;
- wakeup(aiop->aioproc);
- } else if (((num_aio_resv_start + num_aio_procs) < max_aio_procs) &&
- ((ki->kaio_active_count + num_aio_resv_start) <
- ki->kaio_maxactive_count)) {
- num_aio_resv_start++;
- if ((error = aio_newproc()) == 0) {
- num_aio_resv_start--;
- goto retryproc;
- }
- num_aio_resv_start--;
- }
- crit_exit();
-done:
- return error;
-}
-
-/*
- * This routine queues an AIO request, checking for quotas.
- */
-static int
-aio_aqueue(struct aiocb *job, int type)
-{
- struct proc *p = curproc;
- 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(job, NULL, type);
-}
-#endif /* VFS_AIO */
-
-/*
- * Support the aio_return system call, as a side-effect, kernel resources are
- * released.
- *
- * MPALMOSTSAFE
- */
int
sys_aio_return(struct aio_return_args *uap)
{
-#ifndef VFS_AIO
- return (ENOSYS);
-#else
- struct proc *p = curproc;
- struct lwp *lp = curthread->td_lwp;
- long jobref;
- struct aiocblist *cb, *ncb;
- struct aiocb *ujob;
- struct kaioinfo *ki;
- int error;
-
- ki = p->p_aioinfo;
- if (ki == NULL)
- return EINVAL;
-
- ujob = uap->aiocbp;
-
- jobref = fuword(&ujob->_aiocb_private.kernelinfo);
- if (jobref == -1 || jobref == 0)
- return EINVAL;
-
- get_mplock();
- TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
- if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo) ==
- jobref) {
- if (ujob == cb->uuaiocb) {
- uap->sysmsg_result =
- cb->uaiocb._aiocb_private.status;
- } else {
- uap->sysmsg_result = EFAULT;
- }
- if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
- lp->lwp_ru.ru_oublock += cb->outputcharge;
- cb->outputcharge = 0;
- } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
- lp->lwp_ru.ru_inblock += cb->inputcharge;
- cb->inputcharge = 0;
- }
- aio_free_entry(cb);
- error = 0;
- goto done;
- }
- }
- crit_enter();
- for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = ncb) {
- ncb = TAILQ_NEXT(cb, plist);
- if (((intptr_t) cb->uaiocb._aiocb_private.kernelinfo)
- == jobref) {
- crit_exit();
- if (ujob == cb->uuaiocb) {
- uap->sysmsg_result =
- cb->uaiocb._aiocb_private.status;
- } else {
- uap->sysmsg_result = EFAULT;
- }
- aio_free_entry(cb);
- error = 0;
- goto done;
- }
- }
- crit_exit();
- error = EINVAL;
-done:
- rel_mplock();
- return (error);
-#endif /* VFS_AIO */
+ return ENOSYS;
}
-/*
- * Allow a process to wakeup when any of the I/O requests are completed.
- *
- * MPALMOSTSAFE
- */
int
sys_aio_suspend(struct aio_suspend_args *uap)
{
-#ifndef VFS_AIO
return ENOSYS;
-#else
- struct proc *p = curproc;
- struct timeval atv;
- struct timespec ts;
- struct aiocb *const *cbptr, *cbp;
- struct kaioinfo *ki;
- struct aiocblist *cb;
- int i;
- int njoblist;
- int error, timo;
- long *ijoblist;
- struct aiocb **ujoblist;
-
- if ((u_int)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_high(&atv);
- }
-
- ki = p->p_aioinfo;
- if (ki == NULL)
- return EAGAIN;
-
- get_mplock();
-
- njoblist = 0;
- ijoblist = objcache_get(aiol_oc, M_WAITOK);
- ujoblist = objcache_get(aiol_oc, 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) {
- objcache_put(aiol_oc, ijoblist);
- objcache_put(aiol_oc, ujoblist);
- error = 0;
- goto done;
- }
-
- 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;
- objcache_put(aiol_oc, ijoblist);
- objcache_put(aiol_oc, ujoblist);
- goto done;
- }
- }
- }
-
- crit_enter();
- 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]) {
- crit_exit();
- if (ujoblist[i] != cb->uuaiocb)
- error = EINVAL;
- objcache_put(aiol_oc, ijoblist);
- objcache_put(aiol_oc, ujoblist);
- goto done;
- }
- }
- }
-
- ki->kaio_flags |= KAIO_WAKEUP;
- error = tsleep(p, PCATCH, "aiospn", timo);
- crit_exit();
-
- if (error == ERESTART || error == EINTR) {
- objcache_put(aiol_oc, ijoblist);
- objcache_put(aiol_oc, ujoblist);
- error = EINTR;
- goto done;
- } else if (error == EWOULDBLOCK) {
- objcache_put(aiol_oc, ijoblist);
- objcache_put(aiol_oc, ujoblist);
- error = EAGAIN;
- goto done;
- }
- }
-
-/* NOTREACHED */
- error = EINVAL;
-done:
- rel_mplock();
- return (error);
-#endif /* VFS_AIO */
}
-/*
- * aio_cancel cancels any non-physio aio operations not currently in
- * progress.
- *
- * MPALMOSTSAFE
- */
int
sys_aio_cancel(struct aio_cancel_args *uap)
{
-#ifndef VFS_AIO
return ENOSYS;
-#else
- struct proc *p = curproc;
- struct kaioinfo *ki;
- struct aiocblist *cbe, *cbn;
- struct file *fp;
- struct socket *so;
- struct proc *po;
- int error;
- int cancelled=0;
- int notcancelled=0;
- struct vnode *vp;
-
- fp = holdfp(p->p_fd, uap->fd, -1);
- if (fp == NULL)
- return (EBADF);
-
- get_mplock();
-
- if (fp->f_type == DTYPE_VNODE) {
- vp = (struct vnode *)fp->f_data;
-
- if (vn_isdisk(vp,&error)) {
- uap->sysmsg_result = AIO_NOTCANCELED;
- error = 0;
- goto done2;
- }
- } else if (fp->f_type == DTYPE_SOCKET) {
- so = (struct socket *)fp->f_data;
-
- crit_enter();
-
- 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)
- ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
- if (uap->aiocbp)
- break;
- }
- }
- crit_exit();
-
- if ((cancelled) && (uap->aiocbp)) {
- uap->sysmsg_result = AIO_CANCELED;
- error = 0;
- goto done2;
- }
- }
- ki=p->p_aioinfo;
- if (ki == NULL)
- goto done;
- crit_enter();
-
- 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)
- ksignal(cbe->userproc, cbe->uaiocb.aio_sigevent.sigev_signo);
- } else {
- notcancelled++;
- }
- }
- }
- crit_exit();
-done:
- if (notcancelled)
- uap->sysmsg_result = AIO_NOTCANCELED;
- else if (cancelled)
- uap->sysmsg_result = AIO_CANCELED;
- else
- uap->sysmsg_result = AIO_ALLDONE;
- error = 0;
-done2:
- rel_mplock();
- fdrop(fp);
- return error;
-#endif /* VFS_AIO */
}
-/*
- * 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.
- *
- * MPALMOSTSAFE
- */
int
sys_aio_error(struct aio_error_args *uap)
{
-#ifndef VFS_AIO
return ENOSYS;
-#else
- struct proc *p = curproc;
- struct aiocblist *cb;
- struct kaioinfo *ki;
- long jobref;
- int error;
-
- ki = p->p_aioinfo;
- if (ki == NULL)
- return EINVAL;
-
- jobref = fuword(&uap->aiocbp->_aiocb_private.kernelinfo);
- if ((jobref == -1) || (jobref == 0))
- return EINVAL;
-
- get_mplock();
- error = 0;
-
- TAILQ_FOREACH(cb, &ki->kaio_jobdone, plist) {
- if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
- jobref) {
- uap->sysmsg_result = cb->uaiocb._aiocb_private.error;
- goto done;
- }
- }
-
- crit_enter();
-
- for (cb = TAILQ_FIRST(&ki->kaio_jobqueue); cb; cb = TAILQ_NEXT(cb,
- plist)) {
- if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
- jobref) {
- uap->sysmsg_result = EINPROGRESS;
- crit_exit();
- goto done;
- }
- }
-
- for (cb = TAILQ_FIRST(&ki->kaio_sockqueue); cb; cb = TAILQ_NEXT(cb,
- plist)) {
- if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
- jobref) {
- uap->sysmsg_result = EINPROGRESS;
- crit_exit();
- goto done;
- }
- }
- crit_exit();
-
- crit_enter();
- for (cb = TAILQ_FIRST(&ki->kaio_bufdone); cb; cb = TAILQ_NEXT(cb,
- plist)) {
- if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
- jobref) {
- uap->sysmsg_result = cb->uaiocb._aiocb_private.error;
- crit_exit();
- goto done;
- }
- }
-
- for (cb = TAILQ_FIRST(&ki->kaio_bufqueue); cb; cb = TAILQ_NEXT(cb,
- plist)) {
- if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo) ==
- jobref) {
- uap->sysmsg_result = EINPROGRESS;
- crit_exit();
- goto done;
- }
- }
- crit_exit();
- error = EINVAL;
-done:
- rel_mplock();
- return (error);
-#endif /* VFS_AIO */
}
-/*
- * syscall - asynchronous read from a file (REALTIME)
- *
- * MPALMOSTSAFE
- */
int
sys_aio_read(struct aio_read_args *uap)
{
-#ifndef VFS_AIO
return ENOSYS;
-#else
- int error;
-
- get_mplock();
- error = aio_aqueue(uap->aiocbp, LIO_READ);
- rel_mplock();
- return (error);
-#endif /* VFS_AIO */
}
-/*
- * syscall - asynchronous write to a file (REALTIME)
- *
- * MPALMOSTSAFE
- */
int
sys_aio_write(struct aio_write_args *uap)
{
-#ifndef VFS_AIO
return ENOSYS;
-#else
- int error;
-
- get_mplock();
- error = aio_aqueue(uap->aiocbp, LIO_WRITE);
- rel_mplock();
- return (error);
-#endif /* VFS_AIO */
}
-/*
- * syscall - XXX undocumented
- *
- * MPALMOSTSAFE
- */
int
sys_lio_listio(struct lio_listio_args *uap)
{
-#ifndef VFS_AIO
return ENOSYS;
-#else
- struct proc *p = curproc;
- struct lwp *lp = curthread->td_lwp;
- 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;
-
- if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
- return EINVAL;
-
- nent = uap->nent;
- if (nent > AIO_LISTIO_MAX)
- return EINVAL;
-
- get_mplock();
-
- if (p->p_aioinfo == NULL)
- aio_init_aioinfo(p);
-
- if ((nent + num_queue_count) > max_queue_count) {
- error = EAGAIN;
- goto done;
- }
-
- ki = p->p_aioinfo;
- if ((nent + ki->kaio_queue_count) > ki->kaio_qallowed_count) {
- error = EAGAIN;
- goto done;
- }
-
- lj = objcache_get(aiolio_oc, M_WAITOK);
- if (lj == NULL) {
- error = EAGAIN;
- goto done;
- }
-
- 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) {
- objcache_put(aiolio_oc, lj);
- goto done;
- }
- if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
- objcache_put(aiolio_oc, lj);
- error = EINVAL;
- goto done;
- }
- lj->lioj_flags |= LIOJ_SIGNAL;
- lj->lioj_flags &= ~LIOJ_SIGNAL_POSTED;
- } else
- 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(iocb, lj, 0);
- if (error == 0)
- nentqueued++;
- else
- nerror++;
- }
- }
-
- /*
- * If we haven't queued any, then just return error.
- */
- if (nentqueued == 0) {
- error = 0;
- goto done;
- }
-
- /*
- * 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) {
- lp->lwp_ru.ru_oublock +=
- cb->outputcharge;
- cb->outputcharge = 0;
- } else if (cb->uaiocb.aio_lio_opcode
- == LIO_READ) {
- lp->lwp_ru.ru_inblock +=
- cb->inputcharge;
- cb->inputcharge = 0;
- }
- found++;
- break;
- }
- }
-
- crit_enter();
- TAILQ_FOREACH(cb, &ki->kaio_bufdone, plist) {
- if (((intptr_t)cb->uaiocb._aiocb_private.kernelinfo)
- == jobref) {
- found++;
- break;
- }
- }
- crit_exit();
- }
-
- /*
- * If all I/Os have been disposed of, then we can
- * return.
- */
- if (found == nentqueued) {
- error = runningcode;
- goto done;
- }
-
- ki->kaio_flags |= KAIO_WAKEUP;
- error = tsleep(p, PCATCH, "aiospn", 0);
-
- if (error == EINTR) {
- goto done;
- } else if (error == EWOULDBLOCK) {
- error = EAGAIN;
- goto done;
- }
- }
- }
-
- error = runningcode;
-done:
- rel_mplock();
- return (error);
-#endif /* VFS_AIO */
-}
-
-#ifdef VFS_AIO
-/*
- * 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)) {
- ksignal(lj->lioj_ki->kaio_p, lj->lioj_signal.sigev_signo);
- lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
- }
-
- if (cb->aio_sigevent.sigev_notify == SIGEV_SIGNAL)
- ksignal(aiocbe->userproc, cb->aio_sigevent.sigev_signo);
}
-/*
- * Interrupt handler for physio, performs the necessary process wakeups, and
- * signals.
- */
-static void
-aio_physwakeup(struct bio *bio)
-{
- struct buf *bp = bio->bio_buf;
- struct aiocblist *aiocbe;
- struct proc *p;
- struct kaioinfo *ki;
- struct aio_liojob *lj;
-
- aiocbe = bio->bio_caller_info2.ptr;
- get_mplock();
-
- if (aiocbe) {
- p = bio->bio_caller_info1.ptr;
-
- aiocbe->jobstate = JOBST_JOBBFINISHED;
- aiocbe->uaiocb._aiocb_private.status -= bp->b_resid;
- aiocbe->uaiocb._aiocb_private.error = 0;
- aiocbe->jobflags |= AIOCBLIST_DONE;
-
- if (bp->b_flags & B_ERROR)
- aiocbe->uaiocb._aiocb_private.error = bp->b_error;
-
- lj = aiocbe->lio;
- if (lj) {
- lj->lioj_buffer_finished_count++;
-
- /*
- * wakeup/signal if all of the interrupt jobs are done.
- */
- if (lj->lioj_buffer_finished_count ==
- lj->lioj_buffer_count) {
- /*
- * Post a signal if it is called for.
- */
- if ((lj->lioj_flags &
- (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED)) ==
- LIOJ_SIGNAL) {
- lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
- callout_reset(&aiocbe->timeout, 0,
- process_signal, aiocbe);
- }
- }
- }
-
- 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) {
- callout_reset(&aiocbe->timeout, 0,
- process_signal, aiocbe);
- }
- }
- biodone_sync(bio);
- rel_mplock();
-}
-#endif /* VFS_AIO */
-
-/*
- * syscall - wait for the next completion of an aio request
- *
- * MPALMOSTSAFE
- */
int
sys_aio_waitcomplete(struct aio_waitcomplete_args *uap)
{
-#ifndef VFS_AIO
return ENOSYS;
-#else
- struct proc *p = curproc;
- struct lwp *lp = curthread->td_lwp;
- struct timeval atv;
- struct timespec ts;
- struct kaioinfo *ki;
- struct aiocblist *cb = NULL;
- int error, 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_high(&atv);
- }
-
- ki = p->p_aioinfo;
- if (ki == NULL)
- return EAGAIN;
-
- get_mplock();
-
- for (;;) {
- if ((cb = TAILQ_FIRST(&ki->kaio_jobdone)) != 0) {
- suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
- uap->sysmsg_result = cb->uaiocb._aiocb_private.status;
- if (cb->uaiocb.aio_lio_opcode == LIO_WRITE) {
- lp->lwp_ru.ru_oublock +=
- cb->outputcharge;
- cb->outputcharge = 0;
- } else if (cb->uaiocb.aio_lio_opcode == LIO_READ) {
- lp->lwp_ru.ru_inblock += cb->inputcharge;
- cb->inputcharge = 0;
- }
- aio_free_entry(cb);
- error = cb->uaiocb._aiocb_private.error;
- break;
- }
-
- crit_enter();
- if ((cb = TAILQ_FIRST(&ki->kaio_bufdone)) != 0 ) {
- crit_exit();
- suword(uap->aiocbp, (uintptr_t)cb->uuaiocb);
- uap->sysmsg_result = cb->uaiocb._aiocb_private.status;
- aio_free_entry(cb);
- error = cb->uaiocb._aiocb_private.error;
- break;
- }
-
- ki->kaio_flags |= KAIO_WAKEUP;
- error = tsleep(p, PCATCH, "aiowc", timo);
- crit_exit();
-
- if (error == ERESTART) {
- error = EINTR;
- break;
- }
- if (error < 0)
- break;
- if (error == EINTR)
- break;
- if (error == EWOULDBLOCK) {
- error = EAGAIN;
- break;
- }
- }
- rel_mplock();
- return (error);
-#endif /* VFS_AIO */
}
-#ifndef VFS_AIO
static int
filt_aioattach(struct knote *kn)
{
- return (ENXIO);
+ return ENXIO;
}
struct filterops aio_filtops =
{ 0, filt_aioattach, NULL, NULL };
-
-#else
-/* 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;
-
- knote_insert(&aiocbe->klist, kn);
-
- return (0);
-}
-
-/* kqueue detach function */
-static void
-filt_aiodetach(struct knote *kn)
-{
- struct aiocblist *aiocbe = (struct aiocblist *)kn->kn_sdata;
-
- knote_remove(&aiocbe->klist, kn);
-}
-
-/* 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);
-}
-
-struct filterops aio_filtops =
- { 0, filt_aioattach, filt_aiodetach, filt_aio };
-#endif /* VFS_AIO */
projects / dragonfly.git / commitdiff