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Implement aio_fsync() syscall.

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This commit is contained in:
David Xu 2006-03-23 08:46:42 +00:00
parent 1306964a1a
commit 99eee864ad
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=157037
2 changed files with 248 additions and 81 deletions
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1
sys/kern/syscalls.master
View File

@ -817,5 +817,6 @@
462 AUE_NULL MNOSTD { int kmq_unlink(const char *path); }
463 AUE_NULL MSTD { int abort2(const char *why, int nargs, void **args); }
464 AUE_NULL MSTD { int thr_set_name(long id, const char *name); }
465 AUE_NULL MNOSTD { int aio_fsync(int op, struct aiocb *aiocbp); }
; Please copy any additions and changes to the following compatability tables:
; sys/compat/freebsd32/syscalls.master

328
sys/kern/vfs_aio.c
View File

@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
#include <sys/vnode.h>
#include <sys/conf.h>
#include <sys/event.h>
#include <sys/mount.h>
#include <machine/atomic.h>
@ -61,6 +62,7 @@ __FBSDID("$FreeBSD$");
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/uma.h>
#include <sys/aio.h>
@ -68,16 +70,22 @@ __FBSDID("$FreeBSD$");
/*
* Counter for allocating reference ids to new jobs. Wrapped to 1 on
* overflow.
* overflow. (XXX will be removed soon.)
*/
static long jobrefid;
static u_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
/*
* Counter for aio_fsync.
*/
static uint64_t jobseqno;
#define JOBST_NULL 0
#define JOBST_JOBQSOCK 1
#define JOBST_JOBQGLOBAL 2
#define JOBST_JOBRUNNING 3
#define JOBST_JOBFINISHED 4
#define JOBST_JOBQBUF 5
#define JOBST_JOBQSYNC 6
#ifndef MAX_AIO_PER_PROC
#define MAX_AIO_PER_PROC 32
@ -227,13 +235,16 @@ struct aiocblist {
struct knlist klist; /* (a) list of knotes */
struct aiocb uaiocb; /* (*) kernel I/O control block */
ksiginfo_t ksi; /* (a) realtime signal info */
struct task biotask; /* (*) private to BIO backend */
struct task biotask; /* (*) private to BIO backend */
uint64_t seqno; /* (*) job number */
int pending; /* (a) number of pending I/O, aio_fsync only */
};
/* jobflags */
#define AIOCBLIST_DONE 0x01
#define AIOCBLIST_BUFDONE 0x02
#define AIOCBLIST_RUNDOWN 0x04
#define AIOCBLIST_DONE 0x10
#define AIOCBLIST_BUFDONE 0x20
#define AIOCBLIST_CHECKSYNC 0x08
/*
* AIO process info
@ -280,8 +291,10 @@ struct kaioinfo {
TAILQ_HEAD(,aiocblist) kaio_jobqueue; /* (a) job queue for process */
TAILQ_HEAD(,aiocblist) kaio_bufqueue; /* (a) buffer job queue for process */
TAILQ_HEAD(,aiocblist) kaio_sockqueue; /* (a) queue for aios waiting on sockets,
* not used yet.
* NOT USED YET.
*/
TAILQ_HEAD(,aiocblist) kaio_syncqueue; /* (a) queue for aio_fsync */
struct task kaio_task; /* (*) task to kick aio threads */
};
#define KAIO_RUNDOWN 0x1 /* process is being run down */
@ -300,7 +313,7 @@ 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);
struct aioliojob *lio, int type, int osigev, uint64_t *jseqno);
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);
@ -308,17 +321,19 @@ 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 void aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type);
#define DONE_BUF 1
#define DONE_QUEUE 2
static int do_lio_listio(struct thread *td, struct lio_listio_args *uap, int oldsigev);
static void aio_kick(struct proc *userp);
static void aio_kick_nowait(struct proc *userp);
static void aio_kick_helper(void *context, int pending);
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:
@ -370,13 +385,14 @@ static moduledata_t aio_mod = {
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_fsync);
SYSCALL_MODULE_HELPER(aio_read);
SYSCALL_MODULE_HELPER(aio_write);
SYSCALL_MODULE_HELPER(aio_return);
SYSCALL_MODULE_HELPER(aio_suspend);
SYSCALL_MODULE_HELPER(aio_waitcomplete);
SYSCALL_MODULE_HELPER(aio_write);
SYSCALL_MODULE_HELPER(lio_listio);
SYSCALL_MODULE_HELPER(oaio_read);
SYSCALL_MODULE_HELPER(oaio_write);
@ -494,6 +510,8 @@ aio_init_aioinfo(struct proc *p)
TAILQ_INIT(&ki->kaio_bufqueue);
TAILQ_INIT(&ki->kaio_liojoblist);
TAILQ_INIT(&ki->kaio_sockqueue);
TAILQ_INIT(&ki->kaio_syncqueue);
TASK_INIT(&ki->kaio_task, 0, aio_kick_helper, p);
PROC_LOCK(p);
if (p->p_aioinfo == NULL) {
p->p_aioinfo = ki;
@ -566,7 +584,7 @@ aio_free_entry(struct aiocblist *aiocbe)
knlist_delete(&aiocbe->klist, curthread, 1);
sigqueue_take(&aiocbe->ksi);
MPASS(aiocbe->bp == NULL);
MPASS(aiocbe->bp == NULL);
aiocbe->jobstate = JOBST_NULL;
PROC_UNLOCK(p);
@ -638,6 +656,9 @@ aio_proc_rundown(void *arg, struct proc *p)
so = fp->f_data;
TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
remove = 1;
} else if (cbe->jobstate == JOBST_JOBQSYNC) {
TAILQ_REMOVE(&ki->kaio_syncqueue, cbe, list);
remove = 1;
}
mtx_unlock(&aio_job_mtx);
@ -673,10 +694,10 @@ aio_proc_rundown(void *arg, struct proc *p)
lj->lioj_count, lj->lioj_finished_count);
}
}
PROC_UNLOCK(p);
taskqueue_drain(taskqueue_aiod_bio, &ki->kaio_task);
uma_zfree(kaio_zone, ki);
p->p_aioinfo = NULL;
PROC_UNLOCK(p);
}
/*
@ -705,6 +726,35 @@ aio_selectjob(struct aiothreadlist *aiop)
return (aiocbe);
}
/*
* Move all data to a permanent storage device, this code
* simulates fsync syscall.
*/
static int
aio_fsync_vnode(struct thread *td, struct vnode *vp)
{
struct mount *mp;
int vfslocked;
int error;
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
goto drop;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
if (vp->v_object != NULL) {
VM_OBJECT_LOCK(vp->v_object);
vm_object_page_clean(vp->v_object, 0, 0, 0);
VM_OBJECT_UNLOCK(vp->v_object);
}
error = VOP_FSYNC(vp, MNT_WAIT, td);
VOP_UNLOCK(vp, 0, td);
vn_finished_write(mp);
drop:
VFS_UNLOCK_GIANT(vfslocked);
return (error);
}
/*
* 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,
@ -736,6 +786,17 @@ aio_process(struct aiocblist *aiocbe)
cb = &aiocbe->uaiocb;
fp = aiocbe->fd_file;
if (cb->aio_lio_opcode == LIO_SYNC) {
error = 0;
cnt = 0;
if (fp->f_vnode != NULL)
error = aio_fsync_vnode(td, fp->f_vnode);
cb->_aiocb_private.error = error;
cb->_aiocb_private.status = 0;
td->td_ucred = td_savedcred;
return;
}
aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
aiov.iov_len = cb->aio_nbytes;
@ -797,6 +858,7 @@ aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type)
{
struct aioliojob *lj;
struct kaioinfo *ki;
struct aiocblist *scb, *scbn;
int lj_done;
PROC_LOCK_ASSERT(userp, MA_OWNED);
@ -840,6 +902,22 @@ aio_bio_done_notify(struct proc *userp, struct aiocblist *aiocbe, int type)
}
notification_done:
if (aiocbe->jobflags & AIOCBLIST_CHECKSYNC) {
TAILQ_FOREACH_SAFE(scb, &ki->kaio_syncqueue, list, scbn) {
if (scb->pending != -1 &&
aiocbe->fd_file == scb->fd_file &&
aiocbe->seqno < scb->seqno) {
if (--scb->pending == 0) {
mtx_lock(&aio_job_mtx);
scb->jobstate = JOBST_JOBQGLOBAL;
TAILQ_REMOVE(&ki->kaio_syncqueue, scb, list);
TAILQ_INSERT_TAIL(&aio_jobs, scb, list);
aio_kick_nowait(userp);
mtx_unlock(&aio_job_mtx);
}
}
}
}
if (ki->kaio_flags & KAIO_WAKEUP) {
ki->kaio_flags &= ~KAIO_WAKEUP;
wakeup(&userp->p_aioinfo);
@ -875,14 +953,7 @@ aio_daemon(void *_id)
*/
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);
aiop->aiothreadflags = 0;
/*
* Get rid of our current filedescriptors. AIOD's don't need any
@ -1203,8 +1274,7 @@ static void
aio_swake_cb(struct socket *so, struct sockbuf *sb)
{
struct aiocblist *cb, *cbn;
int opcode, wakecount = 0;
struct aiothreadlist *aiop;
int opcode;
if (sb == &so->so_snd)
opcode = LIO_WRITE;
@ -1225,21 +1295,11 @@ aio_swake_cb(struct socket *so, struct sockbuf *sb)
*/
TAILQ_REMOVE(&so->so_aiojobq, cb, list);
TAILQ_INSERT_TAIL(&aio_jobs, cb, list);
wakecount++;
aio_kick_nowait(cb->userproc);
}
}
mtx_unlock(&aio_job_mtx);
SOCKBUF_UNLOCK(sb);
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);
}
}
/*
@ -1248,13 +1308,12 @@ aio_swake_cb(struct socket *so, struct sockbuf *sb)
*/
static int
aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
int type, int oldsigev)
int type, int oldsigev, uint64_t *jseqno)
{
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;
@ -1283,6 +1342,7 @@ aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
aiocbe = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO);
aiocbe->inputcharge = 0;
aiocbe->outputcharge = 0;
aiocbe->pending = -1;
knlist_init(&aiocbe->klist, &p->p_mtx, NULL, NULL, NULL);
if (oldsigev) {
@ -1342,21 +1402,25 @@ aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
suword(&job->_aiocb_private.error, error);
return (error);
}
aiocbe->fd_file = fp;
if (opcode == LIO_SYNC && fp->f_vnode == NULL) {
error = EINVAL;
goto aqueue_fail;
}
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);
aiocbe->fd_file = fp;
mtx_lock(&aio_job_mtx);
jid = jobrefid++;
aiocbe->seqno = jobseqno++;
if (jseqno)
*jseqno = aiocbe->seqno;
mtx_unlock(&aio_job_mtx);
error = suword(&job->_aiocb_private.kernelinfo, jid);
if (error) {
error = EINVAL;
@ -1369,14 +1433,15 @@ aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
uma_zfree(aiocb_zone, aiocbe);
return (0);
}
if ((opcode != LIO_READ) && (opcode != LIO_WRITE)) {
if ((opcode != LIO_READ) && (opcode != LIO_WRITE) &&
(opcode != LIO_SYNC)) {
error = EINVAL;
goto aqueue_fail;
}
if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT) {
if (aiocbe->uaiocb.aio_sigevent.sigev_notify == SIGEV_KEVENT)
kev.ident = aiocbe->uaiocb.aio_sigevent.sigev_notify_kqueue;
} else
else
goto no_kqueue;
error = fget(td, (u_int)kev.ident, &kq_fp);
if (error)
@ -1410,6 +1475,9 @@ aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
aiocbe->jobflags = 0;
aiocbe->lio = lj;
if (opcode == LIO_SYNC)
goto queueit;
if (fp->f_type == DTYPE_SOCKET) {
/*
* Alternate queueing for socket ops: Reach down into the
@ -1460,8 +1528,10 @@ aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
goto done;
}
#endif
queueit:
/* No buffer for daemon I/O. */
aiocbe->bp = NULL;
atomic_add_int(&num_queue_count, 1);
PROC_LOCK(p);
ki->kaio_count++;
@ -1469,23 +1539,47 @@ aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *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;
if (opcode == LIO_SYNC) {
TAILQ_INSERT_TAIL(&ki->kaio_syncqueue, aiocbe, list);
aiocbe->jobstate = JOBST_JOBQSYNC;
} else {
mtx_lock(&aio_job_mtx);
TAILQ_INSERT_TAIL(&aio_jobs, aiocbe, list);
aiocbe->jobstate = JOBST_JOBQGLOBAL;
aio_kick_nowait(p);
mtx_unlock(&aio_job_mtx);
}
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;
done:
return (error);
}
static void
aio_kick_nowait(struct proc *userp)
{
struct kaioinfo *ki = userp->p_aioinfo;
struct aiothreadlist *aiop;
mtx_assert(&aio_job_mtx, MA_OWNED);
if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
TAILQ_REMOVE(&aio_freeproc, aiop, list);
aiop->aiothreadflags &= ~AIOP_FREE;
wakeup(aiop->aiothread);
} else {
taskqueue_enqueue(taskqueue_aiod_bio, &ki->kaio_task);
}
}
static void
aio_kick(struct proc *userp)
{
struct kaioinfo *ki = userp->p_aioinfo;
struct aiothreadlist *aiop;
int error;
mtx_assert(&aio_job_mtx, MA_OWNED);
retryproc:
if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
TAILQ_REMOVE(&aio_freeproc, aiop, list);
aiop->aiothreadflags &= ~AIOP_FREE;
@ -1502,10 +1596,17 @@ aio_aqueue(struct thread *td, struct aiocb *job, struct aioliojob *lj,
goto retryproc;
}
}
mtx_unlock(&aio_job_mtx);
}
done:
return (error);
static void
aio_kick_helper(void *context, int pending)
{
struct proc *userp = context;
mtx_lock(&aio_job_mtx);
while (--pending >= 0)
aio_kick(userp);
mtx_unlock(&aio_job_mtx);
}
/*
@ -1695,6 +1796,9 @@ aio_cancel(struct thread *td, struct aio_cancel_args *uap)
so = fp->f_data;
TAILQ_REMOVE(&so->so_aiojobq, cbe, list);
remove = 1;
} else if (cbe->jobstate == JOBST_JOBQSYNC) {
TAILQ_REMOVE(&ki->kaio_syncqueue, cbe, list);
remove = 1;
}
mtx_unlock(&aio_job_mtx);
@ -1789,14 +1893,14 @@ int
oaio_read(struct thread *td, struct oaio_read_args *uap)
{
return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 1);
return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ, 1, NULL);
}
int
aio_read(struct thread *td, struct aio_read_args *uap)
{
return aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, 0);
return aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, 0, NULL);
}
/* syscall - asynchronous write to a file (REALTIME) */
@ -1804,14 +1908,14 @@ int
oaio_write(struct thread *td, struct oaio_write_args *uap)
{
return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 1);
return aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE, 1, NULL);
}
int
aio_write(struct thread *td, struct aio_write_args *uap)
{
return aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, 0);
return aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, 0, NULL);
}
/* syscall - list directed I/O (REALTIME) */
@ -1935,7 +2039,7 @@ do_lio_listio(struct thread *td, struct lio_listio_args *uap, int oldsigev)
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, LIO_NOP, oldsigev);
error = aio_aqueue(td, iocb, lj, LIO_NOP, oldsigev, NULL);
if (error != 0)
nerror++;
}
@ -2105,6 +2209,68 @@ aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap)
return (error);
}
int
aio_fsync(struct thread *td, struct aio_fsync_args *uap)
{
struct proc *p = td->td_proc;
struct aiocblist *cb, *scb;
struct kaioinfo *ki;
struct aiocb uaiocb;
int error;
uint64_t jseqno;
if (uap->op != O_SYNC) /* XXX lack of O_DSYNC */
return (EINVAL);
error = copyin(uap->aiocbp, &uaiocb, sizeof(struct aiocb));
if (error)
return (error);
ki = p->p_aioinfo;
if (ki == NULL)
aio_init_aioinfo(p);
ki = p->p_aioinfo;
error = aio_aqueue(td, uap->aiocbp, NULL, LIO_SYNC, 0, &jseqno);
if (error)
return (error);
PROC_LOCK(p);
TAILQ_FOREACH(scb, &ki->kaio_syncqueue, plist) {
if (scb->seqno == jseqno)
break;
}
if (scb == NULL) {
PROC_UNLOCK(p);
return (0);
}
scb->pending = 0;
TAILQ_FOREACH(cb, &ki->kaio_jobqueue, plist) {
if (cb->fd_file == scb->fd_file &&
cb->uaiocb.aio_lio_opcode != LIO_SYNC &&
cb->seqno < scb->seqno) {
cb->jobflags |= AIOCBLIST_CHECKSYNC;
scb->pending++;
}
}
TAILQ_FOREACH(cb, &ki->kaio_bufqueue, plist) {
if (cb->fd_file == scb->fd_file &&
cb->uaiocb.aio_lio_opcode != LIO_SYNC &&
cb->seqno < scb->seqno) {
cb->jobflags |= AIOCBLIST_CHECKSYNC;
scb->pending++;
}
}
if (scb->pending == 0) {
mtx_lock(&aio_job_mtx);
if (scb->jobstate == JOBST_JOBQSYNC) {
scb->jobstate = JOBST_JOBQGLOBAL;
TAILQ_REMOVE(&ki->kaio_syncqueue, scb, list);
TAILQ_INSERT_TAIL(&aio_jobs, scb, list);
aio_kick_nowait(p);
}
mtx_unlock(&aio_job_mtx);
}
PROC_UNLOCK(p);
return (0);
}
/* kqueue attach function */
static int
filt_aioattach(struct knote *kn)