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phunix/servers/inet/sr.c
Ben Gras 150c964b49 Fix for losing REVIVE
2006-06-20 10:12:30 +00:00

1146 lines
24 KiB
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/* this file contains the interface of the network software with the file
* system.
*
* Copyright 1995 Philip Homburg
*
* The valid messages and their parameters are:
*
* Requests:
*
* m_type NDEV_MINOR NDEV_PROC NDEV_REF NDEV_MODE
* -------------------------------------------------------------
* | DEV_OPEN |minor dev | proc nr | fd | mode |
* |-------------+-----------+-----------+-----------+----------+
* | DEV_CLOSE |minor dev | proc nr | fd | |
* |-------------+-----------+-----------+-----------+----------+
*
* m_type NDEV_MINOR NDEV_PROC NDEV_REF NDEV_COUNT NDEV_BUFFER
* ---------------------------------------------------------------------------
* | DEV_READ |minor dev | proc nr | fd | count | buf ptr |
* |-------------+-----------+-----------+-----------+-----------+-----------|
* | DEV_WRITE |minor dev | proc nr | fd | count | buf ptr |
* |-------------+-----------+-----------+-----------+-----------+-----------|
*
* m_type NDEV_MINOR NDEV_PROC NDEV_REF NDEV_IOCTL NDEV_BUFFER
* ---------------------------------------------------------------------------
* | DEV_IOCTL3 |minor dev | proc nr | fd | command | buf ptr |
* |-------------+-----------+-----------+-----------+-----------+-----------|
*
* m_type NDEV_MINOR NDEV_PROC NDEV_REF NDEV_OPERATION
* -------------------------------------------------------------------|
* | DEV_CANCEL |minor dev | proc nr | fd | which operation|
* |-------------+-----------+-----------+-----------+----------------|
*
* Replies:
*
* m_type REP_PROC_NR REP_STATUS REP_REF REP_OPERATION
* ----------------------------------------------------------------------|
* | DEVICE_REPLY | proc nr | status | fd | which operation |
* |--------------+-------------+------------+---------+-----------------|
*/
#include "inet.h"
#ifndef __minix_vmd /* Minix 3 */
#include <sys/select.h>
#endif
#include <sys/svrctl.h>
#include <minix/callnr.h>
#include "mq.h"
#include "qp.h"
#include "proto.h"
#include "generic/type.h"
#include "generic/assert.h"
#include "generic/buf.h"
#include "generic/event.h"
#include "generic/sr.h"
#include "sr_int.h"
#ifndef __minix_vmd /* Minix 3 */
#define DEV_CANCEL NW_CANCEL
#define DEVICE_REPLY 67 /* old REVIVE */
#define DEV_IOCTL3 DEV_IOCTL
#define NDEV_BUFFER ADDRESS
#define NDEV_COUNT COUNT
#define NDEV_IOCTL REQUEST
#define NDEV_MINOR DEVICE
#define NDEV_PROC IO_ENDPT
#endif
THIS_FILE
PUBLIC sr_fd_t sr_fd_table[FD_NR];
PRIVATE mq_t *repl_queue, *repl_queue_tail;
#ifdef __minix_vmd
PRIVATE cpvec_t cpvec[CPVEC_NR];
#else /* Minix 3 */
PRIVATE struct vir_cp_req vir_cp_req[CPVEC_NR];
#endif
FORWARD _PROTOTYPE ( int sr_open, (message *m) );
FORWARD _PROTOTYPE ( void sr_close, (message *m) );
FORWARD _PROTOTYPE ( int sr_rwio, (mq_t *m) );
FORWARD _PROTOTYPE ( int sr_restart_read, (sr_fd_t *fdp) );
FORWARD _PROTOTYPE ( int sr_restart_write, (sr_fd_t *fdp) );
FORWARD _PROTOTYPE ( int sr_restart_ioctl, (sr_fd_t *fdp) );
FORWARD _PROTOTYPE ( int sr_cancel, (message *m) );
#ifndef __minix_vmd /* Minix 3 */
FORWARD _PROTOTYPE ( int sr_select, (message *m) );
FORWARD _PROTOTYPE ( void sr_status, (message *m) );
#endif
FORWARD _PROTOTYPE ( void sr_reply_, (mq_t *m, int reply, int is_revive) );
FORWARD _PROTOTYPE ( sr_fd_t *sr_getchannel, (int minor));
FORWARD _PROTOTYPE ( acc_t *sr_get_userdata, (int fd, vir_bytes offset,
vir_bytes count, int for_ioctl) );
FORWARD _PROTOTYPE ( int sr_put_userdata, (int fd, vir_bytes offset,
acc_t *data, int for_ioctl) );
#ifdef __minix_vmd
#define sr_select_res 0
#else /* Minix 3 */
FORWARD _PROTOTYPE (void sr_select_res, (int fd, unsigned ops) );
#endif
FORWARD _PROTOTYPE ( int sr_repl_queue, (int proc, int ref, int operation) );
FORWARD _PROTOTYPE ( int walk_queue, (sr_fd_t *sr_fd, mq_t **q_head_ptr,
mq_t **q_tail_ptr, int type, int proc_nr, int ref, int first_flag) );
FORWARD _PROTOTYPE ( void process_req_q, (mq_t *mq, mq_t *tail,
mq_t **tail_ptr) );
FORWARD _PROTOTYPE ( void sr_event, (event_t *evp, ev_arg_t arg) );
FORWARD _PROTOTYPE ( int cp_u2b, (int proc, char *src, acc_t **var_acc_ptr,
int size) );
FORWARD _PROTOTYPE ( int cp_b2u, (acc_t *acc_ptr, int proc, char *dest) );
PUBLIC void sr_init()
{
int i;
for (i=0; i<FD_NR; i++)
{
sr_fd_table[i].srf_flags= SFF_FREE;
ev_init(&sr_fd_table[i].srf_ioctl_ev);
ev_init(&sr_fd_table[i].srf_read_ev);
ev_init(&sr_fd_table[i].srf_write_ev);
}
repl_queue= NULL;
}
PUBLIC void sr_rec(m)
mq_t *m;
{
int result;
int send_reply, free_mess;
if (repl_queue)
{
if (m->mq_mess.m_type == DEV_CANCEL)
{
#ifdef __minix_vmd
result= sr_repl_queue(m->mq_mess.NDEV_PROC,
m->mq_mess.NDEV_REF,
m->mq_mess.NDEV_OPERATION);
#else /* Minix 3 */
result= sr_repl_queue(m->mq_mess.IO_ENDPT, 0, 0);
#endif
if (result)
{
mq_free(m);
return; /* canceled request in queue */
}
}
#if 0
else
sr_repl_queue(ANY, 0, 0);
#endif
}
switch (m->mq_mess.m_type)
{
case DEV_OPEN:
result= sr_open(&m->mq_mess);
send_reply= 1;
free_mess= 1;
break;
case DEV_CLOSE:
sr_close(&m->mq_mess);
result= OK;
send_reply= 1;
free_mess= 1;
break;
case DEV_READ:
case DEV_WRITE:
case DEV_IOCTL3:
result= sr_rwio(m);
assert(result == OK || result == SUSPEND);
send_reply= (result == SUSPEND);
free_mess= 0;
break;
case DEV_CANCEL:
result= sr_cancel(&m->mq_mess);
assert(result == OK || result == EINTR);
send_reply= (result == EINTR);
free_mess= 1;
#ifdef __minix_vmd
m->mq_mess.m_type= m->mq_mess.NDEV_OPERATION;
#else /* Minix 3 */
m->mq_mess.m_type= 0;
#endif
break;
#ifndef __minix_vmd /* Minix 3 */
case DEV_SELECT:
result= sr_select(&m->mq_mess);
send_reply= 1;
free_mess= 1;
break;
case DEV_STATUS:
sr_status(&m->mq_mess);
send_reply= 0;
free_mess= 1;
break;
#endif
default:
ip_panic(("unknown message, from %d, type %d",
m->mq_mess.m_source, m->mq_mess.m_type));
}
if (send_reply)
{
sr_reply_(m, result, FALSE /* !is_revive */);
}
if (free_mess)
mq_free(m);
}
PUBLIC void sr_add_minor(minor, port, openf, closef, readf, writef,
ioctlf, cancelf, selectf)
int minor;
int port;
sr_open_t openf;
sr_close_t closef;
sr_read_t readf;
sr_write_t writef;
sr_ioctl_t ioctlf;
sr_cancel_t cancelf;
sr_select_t selectf;
{
sr_fd_t *sr_fd;
assert (minor>=0 && minor<FD_NR);
sr_fd= &sr_fd_table[minor];
assert(!(sr_fd->srf_flags & SFF_INUSE));
sr_fd->srf_flags= SFF_INUSE | SFF_MINOR;
sr_fd->srf_port= port;
sr_fd->srf_open= openf;
sr_fd->srf_close= closef;
sr_fd->srf_write= writef;
sr_fd->srf_read= readf;
sr_fd->srf_ioctl= ioctlf;
sr_fd->srf_cancel= cancelf;
sr_fd->srf_select= selectf;
}
PRIVATE int sr_open(m)
message *m;
{
sr_fd_t *sr_fd;
int minor= m->NDEV_MINOR;
int i, fd;
if (minor<0 || minor>FD_NR)
{
DBLOCK(1, printf("replying EINVAL\n"));
return EINVAL;
}
if (!(sr_fd_table[minor].srf_flags & SFF_MINOR))
{
DBLOCK(1, printf("replying ENXIO\n"));
return ENXIO;
}
for (i=0; i<FD_NR && (sr_fd_table[i].srf_flags & SFF_INUSE); i++);
if (i>=FD_NR)
{
DBLOCK(1, printf("replying ENFILE\n"));
return ENFILE;
}
sr_fd= &sr_fd_table[i];
*sr_fd= sr_fd_table[minor];
sr_fd->srf_flags= SFF_INUSE;
fd= (*sr_fd->srf_open)(sr_fd->srf_port, i, sr_get_userdata,
sr_put_userdata, 0 /* no put_pkt */, sr_select_res);
if (fd<0)
{
sr_fd->srf_flags= SFF_FREE;
DBLOCK(1, printf("replying %d\n", fd));
return fd;
}
sr_fd->srf_fd= fd;
return i;
}
PRIVATE void sr_close(m)
message *m;
{
sr_fd_t *sr_fd;
sr_fd= sr_getchannel(m->NDEV_MINOR);
assert (sr_fd);
if (sr_fd->srf_flags & SFF_BUSY)
ip_panic(("close on busy channel"));
assert (!(sr_fd->srf_flags & SFF_MINOR));
(*sr_fd->srf_close)(sr_fd->srf_fd);
sr_fd->srf_flags= SFF_FREE;
}
PRIVATE int sr_rwio(m)
mq_t *m;
{
sr_fd_t *sr_fd;
mq_t **q_head_ptr, **q_tail_ptr;
int ip_flag, susp_flag, first_flag;
int r;
ioreq_t request;
size_t size;
sr_fd= sr_getchannel(m->mq_mess.NDEV_MINOR);
assert (sr_fd);
switch(m->mq_mess.m_type)
{
case DEV_READ:
q_head_ptr= &sr_fd->srf_read_q;
q_tail_ptr= &sr_fd->srf_read_q_tail;
ip_flag= SFF_READ_IP;
susp_flag= SFF_READ_SUSP;
first_flag= SFF_READ_FIRST;
break;
case DEV_WRITE:
q_head_ptr= &sr_fd->srf_write_q;
q_tail_ptr= &sr_fd->srf_write_q_tail;
ip_flag= SFF_WRITE_IP;
susp_flag= SFF_WRITE_SUSP;
first_flag= SFF_WRITE_FIRST;
break;
case DEV_IOCTL3:
q_head_ptr= &sr_fd->srf_ioctl_q;
q_tail_ptr= &sr_fd->srf_ioctl_q_tail;
ip_flag= SFF_IOCTL_IP;
susp_flag= SFF_IOCTL_SUSP;
first_flag= SFF_IOCTL_FIRST;
break;
default:
ip_panic(("illegal case entry"));
}
if (sr_fd->srf_flags & ip_flag)
{
assert(sr_fd->srf_flags & susp_flag);
assert(*q_head_ptr);
(*q_tail_ptr)->mq_next= m;
*q_tail_ptr= m;
return SUSPEND;
}
assert(!*q_head_ptr);
*q_tail_ptr= *q_head_ptr= m;
sr_fd->srf_flags |= ip_flag;
assert(!(sr_fd->srf_flags & first_flag));
sr_fd->srf_flags |= first_flag;
switch(m->mq_mess.m_type)
{
case DEV_READ:
r= (*sr_fd->srf_read)(sr_fd->srf_fd,
m->mq_mess.NDEV_COUNT);
break;
case DEV_WRITE:
r= (*sr_fd->srf_write)(sr_fd->srf_fd,
m->mq_mess.NDEV_COUNT);
break;
case DEV_IOCTL3:
request= m->mq_mess.NDEV_IOCTL;
/* There should be a better way to do this... */
if (request == NWIOQUERYPARAM)
{
r= qp_query(m->mq_mess.NDEV_PROC,
(vir_bytes)m->mq_mess.NDEV_BUFFER);
r= sr_put_userdata(sr_fd-sr_fd_table, r, NULL, 1);
assert(r == OK);
break;
}
/* And now, we continue with our regular program. */
size= (request >> 16) & _IOCPARM_MASK;
if (size>MAX_IOCTL_S)
{
DBLOCK(1, printf("replying EINVAL\n"));
r= sr_put_userdata(sr_fd-sr_fd_table, EINVAL,
NULL, 1);
assert(r == OK);
assert(sr_fd->srf_flags & first_flag);
sr_fd->srf_flags &= ~first_flag;
return OK;
}
r= (*sr_fd->srf_ioctl)(sr_fd->srf_fd, request);
break;
default:
ip_panic(("illegal case entry"));
}
assert(sr_fd->srf_flags & first_flag);
sr_fd->srf_flags &= ~first_flag;
assert(r == OK || r == SUSPEND ||
(printf("r= %d\n", r), 0));
if (r == SUSPEND)
sr_fd->srf_flags |= susp_flag;
else
mq_free(m);
return r;
}
PRIVATE int sr_restart_read(sr_fd)
sr_fd_t *sr_fd;
{
mq_t *mp;
int r;
mp= sr_fd->srf_read_q;
assert(mp);
if (sr_fd->srf_flags & SFF_READ_IP)
{
assert(sr_fd->srf_flags & SFF_READ_SUSP);
return SUSPEND;
}
sr_fd->srf_flags |= SFF_READ_IP;
r= (*sr_fd->srf_read)(sr_fd->srf_fd,
mp->mq_mess.NDEV_COUNT);
assert(r == OK || r == SUSPEND ||
(printf("r= %d\n", r), 0));
if (r == SUSPEND)
sr_fd->srf_flags |= SFF_READ_SUSP;
return r;
}
PRIVATE int sr_restart_write(sr_fd)
sr_fd_t *sr_fd;
{
mq_t *mp;
int r;
mp= sr_fd->srf_write_q;
assert(mp);
if (sr_fd->srf_flags & SFF_WRITE_IP)
{
assert(sr_fd->srf_flags & SFF_WRITE_SUSP);
return SUSPEND;
}
sr_fd->srf_flags |= SFF_WRITE_IP;
r= (*sr_fd->srf_write)(sr_fd->srf_fd,
mp->mq_mess.NDEV_COUNT);
assert(r == OK || r == SUSPEND ||
(printf("r= %d\n", r), 0));
if (r == SUSPEND)
sr_fd->srf_flags |= SFF_WRITE_SUSP;
return r;
}
PRIVATE int sr_restart_ioctl(sr_fd)
sr_fd_t *sr_fd;
{
mq_t *mp;
int r;
mp= sr_fd->srf_ioctl_q;
assert(mp);
if (sr_fd->srf_flags & SFF_IOCTL_IP)
{
assert(sr_fd->srf_flags & SFF_IOCTL_SUSP);
return SUSPEND;
}
sr_fd->srf_flags |= SFF_IOCTL_IP;
r= (*sr_fd->srf_ioctl)(sr_fd->srf_fd,
mp->mq_mess.NDEV_COUNT);
assert(r == OK || r == SUSPEND ||
(printf("r= %d\n", r), 0));
if (r == SUSPEND)
sr_fd->srf_flags |= SFF_IOCTL_SUSP;
return r;
}
PRIVATE int sr_cancel(m)
message *m;
{
sr_fd_t *sr_fd;
int result;
int proc_nr, ref, operation;
result=EINTR;
proc_nr= m->NDEV_PROC;
#ifdef __minix_vmd
ref= m->NDEV_REF;
operation= m->NDEV_OPERATION;
#else /* Minix 3 */
ref= 0;
operation= 0;
#endif
sr_fd= sr_getchannel(m->NDEV_MINOR);
assert (sr_fd);
#ifdef __minix_vmd
if (operation == CANCEL_ANY || operation == DEV_IOCTL3)
#endif
{
result= walk_queue(sr_fd, &sr_fd->srf_ioctl_q,
&sr_fd->srf_ioctl_q_tail, SR_CANCEL_IOCTL,
proc_nr, ref, SFF_IOCTL_FIRST);
if (result != EAGAIN)
return result;
}
#ifdef __minix_vmd
if (operation == CANCEL_ANY || operation == DEV_READ)
#endif
{
result= walk_queue(sr_fd, &sr_fd->srf_read_q,
&sr_fd->srf_read_q_tail, SR_CANCEL_READ,
proc_nr, ref, SFF_READ_FIRST);
if (result != EAGAIN)
return result;
}
#ifdef __minix_vmd
if (operation == CANCEL_ANY || operation == DEV_WRITE)
#endif
{
result= walk_queue(sr_fd, &sr_fd->srf_write_q,
&sr_fd->srf_write_q_tail, SR_CANCEL_WRITE,
proc_nr, ref, SFF_WRITE_FIRST);
if (result != EAGAIN)
return result;
}
#ifdef __minix_vmd
ip_panic((
"request not found: from %d, type %d, MINOR= %d, PROC= %d, REF= %d OPERATION= %ld",
m->m_source, m->m_type, m->NDEV_MINOR,
m->NDEV_PROC, m->NDEV_REF, m->NDEV_OPERATION));
#else /* Minix 3 */
ip_panic((
"request not found: from %d, type %d, MINOR= %d, PROC= %d",
m->m_source, m->m_type, m->NDEV_MINOR,
m->NDEV_PROC));
#endif
}
#ifndef __minix_vmd /* Minix 3 */
PRIVATE int sr_select(m)
message *m;
{
sr_fd_t *sr_fd;
mq_t **q_head_ptr, **q_tail_ptr;
int ip_flag, susp_flag;
int r, ops;
unsigned m_ops, i_ops;
ioreq_t request;
size_t size;
sr_fd= sr_getchannel(m->NDEV_MINOR);
assert (sr_fd);
sr_fd->srf_select_proc= m->m_source;
m_ops= m->IO_ENDPT;
i_ops= 0;
if (m_ops & SEL_RD) i_ops |= SR_SELECT_READ;
if (m_ops & SEL_WR) i_ops |= SR_SELECT_WRITE;
if (m_ops & SEL_ERR) i_ops |= SR_SELECT_EXCEPTION;
if (!(m_ops & SEL_NOTIFY)) i_ops |= SR_SELECT_POLL;
r= (*sr_fd->srf_select)(sr_fd->srf_fd, i_ops);
if (r < 0)
return r;
m_ops= 0;
if (r & SR_SELECT_READ) m_ops |= SEL_RD;
if (r & SR_SELECT_WRITE) m_ops |= SEL_WR;
if (r & SR_SELECT_EXCEPTION) m_ops |= SEL_ERR;
return m_ops;
}
PRIVATE void sr_status(m)
message *m;
{
int fd, result;
unsigned m_ops;
sr_fd_t *sr_fd;
mq_t *mq;
mq= repl_queue;
if (mq != NULL)
{
repl_queue= mq->mq_next;
mq->mq_mess.m_type= DEV_REVIVE;
result= send(mq->mq_mess.m_source, &mq->mq_mess);
if (result != OK)
ip_panic(("unable to send"));
mq_free(mq);
return;
}
for (fd=0, sr_fd= sr_fd_table; fd<FD_NR; fd++, sr_fd++)
{
if ((sr_fd->srf_flags &
(SFF_SELECT_R|SFF_SELECT_W|SFF_SELECT_X)) == 0)
{
/* Nothing to report */
continue;
}
if (sr_fd->srf_select_proc != m->m_source)
{
/* Wrong process */
continue;
}
m_ops= 0;
if (sr_fd->srf_flags & SFF_SELECT_R) m_ops |= SEL_RD;
if (sr_fd->srf_flags & SFF_SELECT_W) m_ops |= SEL_WR;
if (sr_fd->srf_flags & SFF_SELECT_X) m_ops |= SEL_ERR;
sr_fd->srf_flags &= ~(SFF_SELECT_R|SFF_SELECT_W|SFF_SELECT_X);
m->m_type= DEV_IO_READY;
m->DEV_MINOR= fd;
m->DEV_SEL_OPS= m_ops;
result= send(m->m_source, m);
if (result != OK)
ip_panic(("unable to send"));
return;
}
m->m_type= DEV_NO_STATUS;
result= send(m->m_source, m);
if (result != OK)
ip_panic(("unable to send"));
}
#endif
PRIVATE int walk_queue(sr_fd, q_head_ptr, q_tail_ptr, type, proc_nr, ref,
first_flag)
sr_fd_t *sr_fd;
mq_t **q_head_ptr;
mq_t **q_tail_ptr;
int type;
int proc_nr;
int ref;
int first_flag;
{
mq_t *q_ptr_prv, *q_ptr;
int result;
for(q_ptr_prv= NULL, q_ptr= *q_head_ptr; q_ptr;
q_ptr_prv= q_ptr, q_ptr= q_ptr->mq_next)
{
if (q_ptr->mq_mess.NDEV_PROC != proc_nr)
continue;
#ifdef __minix_vmd
if (q_ptr->mq_mess.NDEV_REF != ref)
continue;
#endif
if (!q_ptr_prv)
{
assert(!(sr_fd->srf_flags & first_flag));
sr_fd->srf_flags |= first_flag;
result= (*sr_fd->srf_cancel)(sr_fd->srf_fd, type);
assert(result == OK);
*q_head_ptr= q_ptr->mq_next;
mq_free(q_ptr);
assert(sr_fd->srf_flags & first_flag);
sr_fd->srf_flags &= ~first_flag;
return OK;
}
q_ptr_prv->mq_next= q_ptr->mq_next;
mq_free(q_ptr);
if (!q_ptr_prv->mq_next)
*q_tail_ptr= q_ptr_prv;
return EINTR;
}
return EAGAIN;
}
PRIVATE sr_fd_t *sr_getchannel(minor)
int minor;
{
sr_fd_t *loc_fd;
compare(minor, >=, 0);
compare(minor, <, FD_NR);
loc_fd= &sr_fd_table[minor];
assert (!(loc_fd->srf_flags & SFF_MINOR) &&
(loc_fd->srf_flags & SFF_INUSE));
return loc_fd;
}
PRIVATE void sr_reply_(mq, status, is_revive)
mq_t *mq;
int status;
int is_revive;
{
int result, proc, ref,operation;
message reply, *mp;
proc= mq->mq_mess.NDEV_PROC;
#ifdef __minix_vmd
ref= mq->mq_mess.NDEV_REF;
#else /* Minix 3 */
ref= 0;
#endif
operation= mq->mq_mess.m_type;
#ifdef __minix_vmd
assert(operation != DEV_CANCEL);
#endif
if (is_revive)
mp= &mq->mq_mess;
else
mp= &reply;
mp->m_type= DEVICE_REPLY;
mp->REP_ENDPT= proc;
mp->REP_STATUS= status;
#ifdef __minix_vmd
mp->REP_REF= ref;
mp->REP_OPERATION= operation;
#endif
if (is_revive)
{
notify(mq->mq_mess.m_source);
result= ELOCKED;
}
else
result= send(mq->mq_mess.m_source, mp);
if (result == ELOCKED && is_revive)
{
mq->mq_next= NULL;
if (repl_queue)
repl_queue_tail->mq_next= mq;
else
repl_queue= mq;
repl_queue_tail= mq;
return;
}
if (result != OK)
ip_panic(("unable to send"));
if (is_revive)
mq_free(mq);
}
PRIVATE acc_t *sr_get_userdata (fd, offset, count, for_ioctl)
int fd;
vir_bytes offset;
vir_bytes count;
int for_ioctl;
{
sr_fd_t *loc_fd;
mq_t **head_ptr, *m, *mq;
int ip_flag, susp_flag, first_flag;
int result, suspended, is_revive;
char *src;
acc_t *acc;
event_t *evp;
ev_arg_t arg;
loc_fd= &sr_fd_table[fd];
if (for_ioctl)
{
head_ptr= &loc_fd->srf_ioctl_q;
evp= &loc_fd->srf_ioctl_ev;
ip_flag= SFF_IOCTL_IP;
susp_flag= SFF_IOCTL_SUSP;
first_flag= SFF_IOCTL_FIRST;
}
else
{
head_ptr= &loc_fd->srf_write_q;
evp= &loc_fd->srf_write_ev;
ip_flag= SFF_WRITE_IP;
susp_flag= SFF_WRITE_SUSP;
first_flag= SFF_WRITE_FIRST;
}
assert (loc_fd->srf_flags & ip_flag);
if (!count)
{
m= *head_ptr;
mq= m->mq_next;
*head_ptr= mq;
result= (int)offset;
is_revive= !(loc_fd->srf_flags & first_flag);
sr_reply_(m, result, is_revive);
suspended= (loc_fd->srf_flags & susp_flag);
loc_fd->srf_flags &= ~(ip_flag|susp_flag);
if (suspended)
{
if (mq)
{
arg.ev_ptr= loc_fd;
ev_enqueue(evp, sr_event, arg);
}
}
return NULL;
}
src= (*head_ptr)->mq_mess.NDEV_BUFFER + offset;
result= cp_u2b ((*head_ptr)->mq_mess.NDEV_PROC, src, &acc, count);
return result<0 ? NULL : acc;
}
PRIVATE int sr_put_userdata (fd, offset, data, for_ioctl)
int fd;
vir_bytes offset;
acc_t *data;
int for_ioctl;
{
sr_fd_t *loc_fd;
mq_t **head_ptr, *m, *mq;
int ip_flag, susp_flag, first_flag;
int result, suspended, is_revive;
char *dst;
event_t *evp;
ev_arg_t arg;
loc_fd= &sr_fd_table[fd];
if (for_ioctl)
{
head_ptr= &loc_fd->srf_ioctl_q;
evp= &loc_fd->srf_ioctl_ev;
ip_flag= SFF_IOCTL_IP;
susp_flag= SFF_IOCTL_SUSP;
first_flag= SFF_IOCTL_FIRST;
}
else
{
head_ptr= &loc_fd->srf_read_q;
evp= &loc_fd->srf_read_ev;
ip_flag= SFF_READ_IP;
susp_flag= SFF_READ_SUSP;
first_flag= SFF_READ_FIRST;
}
assert (loc_fd->srf_flags & ip_flag);
if (!data)
{
m= *head_ptr;
mq= m->mq_next;
*head_ptr= mq;
result= (int)offset;
is_revive= !(loc_fd->srf_flags & first_flag);
sr_reply_(m, result, is_revive);
suspended= (loc_fd->srf_flags & susp_flag);
loc_fd->srf_flags &= ~(ip_flag|susp_flag);
if (suspended)
{
if (mq)
{
arg.ev_ptr= loc_fd;
ev_enqueue(evp, sr_event, arg);
}
}
return OK;
}
dst= (*head_ptr)->mq_mess.NDEV_BUFFER + offset;
return cp_b2u (data, (*head_ptr)->mq_mess.NDEV_PROC, dst);
}
#ifndef __minix_vmd /* Minix 3 */
PRIVATE void sr_select_res(fd, ops)
int fd;
unsigned ops;
{
sr_fd_t *sr_fd;
sr_fd= &sr_fd_table[fd];
if (ops & SR_SELECT_READ) sr_fd->srf_flags |= SFF_SELECT_R;
if (ops & SR_SELECT_WRITE) sr_fd->srf_flags |= SFF_SELECT_W;
if (ops & SR_SELECT_EXCEPTION) sr_fd->srf_flags |= SFF_SELECT_X;
notify(sr_fd->srf_select_proc);
}
#endif
PRIVATE void process_req_q(mq, tail, tail_ptr)
mq_t *mq, *tail, **tail_ptr;
{
mq_t *m;
int result;
for(;mq;)
{
m= mq;
mq= mq->mq_next;
result= sr_rwio(m);
if (result == SUSPEND)
{
if (mq)
{
(*tail_ptr)->mq_next= mq;
*tail_ptr= tail;
}
return;
}
}
return;
}
PRIVATE void sr_event(evp, arg)
event_t *evp;
ev_arg_t arg;
{
sr_fd_t *sr_fd;
int r;
sr_fd= arg.ev_ptr;
if (evp == &sr_fd->srf_write_ev)
{
while(sr_fd->srf_write_q)
{
r= sr_restart_write(sr_fd);
if (r == SUSPEND)
return;
}
return;
}
if (evp == &sr_fd->srf_read_ev)
{
while(sr_fd->srf_read_q)
{
r= sr_restart_read(sr_fd);
if (r == SUSPEND)
return;
}
return;
}
if (evp == &sr_fd->srf_ioctl_ev)
{
while(sr_fd->srf_ioctl_q)
{
r= sr_restart_ioctl(sr_fd);
if (r == SUSPEND)
return;
}
return;
}
ip_panic(("sr_event: unkown event\n"));
}
PRIVATE int cp_u2b (proc, src, var_acc_ptr, size)
int proc;
char *src;
acc_t **var_acc_ptr;
int size;
{
static message mess;
acc_t *acc;
int i;
acc= bf_memreq(size);
*var_acc_ptr= acc;
i=0;
while (acc)
{
size= (vir_bytes)acc->acc_length;
#ifdef __minix_vmd
cpvec[i].cpv_src= (vir_bytes)src;
cpvec[i].cpv_dst= (vir_bytes)ptr2acc_data(acc);
cpvec[i].cpv_size= size;
#else /* Minix 3 */
vir_cp_req[i].count= size;
vir_cp_req[i].src.proc_nr_e = proc;
vir_cp_req[i].src.segment = D;
vir_cp_req[i].src.offset = (vir_bytes) src;
vir_cp_req[i].dst.proc_nr_e = this_proc;
vir_cp_req[i].dst.segment = D;
vir_cp_req[i].dst.offset = (vir_bytes) ptr2acc_data(acc);
#endif
src += size;
acc= acc->acc_next;
i++;
if (i == CPVEC_NR || acc == NULL)
{
#ifdef __minix_vmd
mess.m_type= SYS_VCOPY;
mess.m1_i1= proc;
mess.m1_i2= this_proc;
mess.m1_i3= i;
mess.m1_p1= (char *)cpvec;
#else /* Minix 3 */
mess.m_type= SYS_VIRVCOPY;
mess.VCP_VEC_SIZE= i;
mess.VCP_VEC_ADDR= (char *)vir_cp_req;
#endif
if (sendrec(SYSTASK, &mess) <0)
ip_panic(("unable to sendrec"));
if (mess.m_type <0)
{
bf_afree(*var_acc_ptr);
*var_acc_ptr= 0;
return mess.m_type;
}
i= 0;
}
}
return OK;
}
PRIVATE int cp_b2u (acc_ptr, proc, dest)
acc_t *acc_ptr;
int proc;
char *dest;
{
static message mess;
acc_t *acc;
int i, size;
acc= acc_ptr;
i=0;
while (acc)
{
size= (vir_bytes)acc->acc_length;
if (size)
{
#ifdef __minix_vmd
cpvec[i].cpv_src= (vir_bytes)ptr2acc_data(acc);
cpvec[i].cpv_dst= (vir_bytes)dest;
cpvec[i].cpv_size= size;
#else /* Minix 3 */
vir_cp_req[i].src.proc_nr_e = this_proc;
vir_cp_req[i].src.segment = D;
vir_cp_req[i].src.offset= (vir_bytes)ptr2acc_data(acc);
vir_cp_req[i].dst.proc_nr_e = proc;
vir_cp_req[i].dst.segment = D;
vir_cp_req[i].dst.offset= (vir_bytes)dest;
vir_cp_req[i].count= size;
#endif
i++;
}
dest += size;
acc= acc->acc_next;
if (i == CPVEC_NR || acc == NULL)
{
#ifdef __minix_vmd
mess.m_type= SYS_VCOPY;
mess.m1_i1= this_proc;
mess.m1_i2= proc;
mess.m1_i3= i;
mess.m1_p1= (char *)cpvec;
#else /* Minix 3 */
mess.m_type= SYS_VIRVCOPY;
mess.VCP_VEC_SIZE= i;
mess.VCP_VEC_ADDR= (char *) vir_cp_req;
#endif
if (sendrec(SYSTASK, &mess) <0)
ip_panic(("unable to sendrec"));
if (mess.m_type <0)
{
bf_afree(acc_ptr);
return mess.m_type;
}
i= 0;
}
}
bf_afree(acc_ptr);
return OK;
}
PRIVATE int sr_repl_queue(proc, ref, operation)
int proc;
int ref;
int operation;
{
mq_t *m, *m_cancel, *m_tmp;
int result;
m_cancel= NULL;
for (m= repl_queue; m;)
{
#ifdef __minix_vmd
if (m->mq_mess.REP_ENDPT == proc &&
m->mq_mess.REP_REF ==ref &&
(m->mq_mess.REP_OPERATION == operation ||
operation == CANCEL_ANY))
#else /* Minix 3 */
if (m->mq_mess.REP_ENDPT == proc)
#endif
{
assert(!m_cancel);
m_cancel= m;
m= m->mq_next;
continue;
}
result= send(m->mq_mess.m_source, &m->mq_mess);
if (result != OK)
ip_panic(("unable to send: %d", result));
m_tmp= m;
m= m->mq_next;
mq_free(m_tmp);
}
repl_queue= NULL;
if (m_cancel)
{
result= send(m_cancel->mq_mess.m_source, &m_cancel->mq_mess);
if (result != OK)
ip_panic(("unable to send: %d", result));
mq_free(m_cancel);
return 1;
}
return 0;
}
/*
* $PchId: sr.c,v 1.17 2005/06/28 14:26:16 philip Exp $
*/
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