minix/servers/inet/sr.c

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2005-04-21 16:53:53 +02:00
/* 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"
#include <minix/callnr.h>
#include "mq.h"
#include "proto.h"
#include "generic/type.h"
#include "generic/assert.h"
#include "generic/buf.h"
#include "generic/sr.h"
THIS_FILE
#define FD_NR (16*IP_PORT_MAX)
typedef struct sr_fd
{
int srf_flags;
int srf_fd;
int srf_port;
sr_open_t srf_open;
sr_close_t srf_close;
sr_write_t srf_write;
sr_read_t srf_read;
sr_ioctl_t srf_ioctl;
sr_cancel_t srf_cancel;
mq_t *srf_ioctl_q, *srf_ioctl_q_tail;
mq_t *srf_read_q, *srf_read_q_tail;
mq_t *srf_write_q, *srf_write_q_tail;
} sr_fd_t;
#define SFF_FLAGS 0x0F
# define SFF_FREE 0x00
# define SFF_MINOR 0x01
# define SFF_INUSE 0x02
# define SFF_BUSY 0x3C
# define SFF_IOCTL_IP 0x04
# define SFF_READ_IP 0x08
# define SFF_WRITE_IP 0x10
# define SFF_PENDING_REQ 0x30
# define SFF_SUSPENDED 0x1C0
# define SFF_IOCTL_SUSP 0x40
# define SFF_READ_SUSP 0x80
# define SFF_WRITE_SUSP 0x100
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_cancel, (message *m) );
FORWARD _PROTOTYPE ( void sr_reply, (mq_t *m, int reply, int can_enqueue) );
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) );
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,
mq_t **q_tail_ptr, int type, int proc_nr, int ref) );
FORWARD _PROTOTYPE ( void process_req_q, (mq_t *mq, mq_t *tail,
mq_t **tail_ptr) );
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) );
PRIVATE sr_fd_t sr_fd_table[FD_NR];
PRIVATE mq_t *repl_queue, *repl_queue_tail;
PRIVATE cpvec_t cpvec[CPVEC_NR];
PUBLIC void sr_init()
{
#if ZERO
int i;
for (i=0; i<FD_NR; i++)
sr_fd_table[i].srf_flags= SFF_FREE;
repl_queue= NULL;
#endif
}
PUBLIC void sr_rec(m)
mq_t *m;
{
int result;
int send_reply, free_mess;
if (repl_queue)
{
if (m->mq_mess.m_type == NW_CANCEL)
{
result= sr_repl_queue(m->mq_mess.PROC_NR, 0, 0);
if (result)
{
mq_free(m);
return; /* canceled request in queue */
}
}
else
sr_repl_queue(ANY, 0, 0);
}
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_IOCTL:
result= sr_rwio(m);
assert(result == OK || result == SUSPEND);
send_reply= (result == SUSPEND);
free_mess= 0;
break;
case CANCEL:
result= sr_cancel(&m->mq_mess);
assert(result == OK || result == EINTR);
send_reply= (result == EINTR);
free_mess= 1;
m->mq_mess.m_type= 0;
break;
#if !CRAMPED
default:
ip_panic(("unknown message, from %d, type %d",
m->mq_mess.m_source, m->mq_mess.m_type));
#endif
}
if (send_reply)
{
sr_reply(m, result, FALSE);
}
if (free_mess)
mq_free(m);
}
PUBLIC void sr_add_minor(minor, port, openf, closef, readf, writef,
ioctlf, cancelf)
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_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;
}
PRIVATE int sr_open(m)
message *m;
{
sr_fd_t *sr_fd;
int minor= m->DEVICE;
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);
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->DEVICE);
assert (sr_fd);
assert (!(sr_fd->srf_flags & SFF_BUSY));
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;
int r;
ioreq_t request;
size_t size;
sr_fd= sr_getchannel(m->mq_mess.DEVICE);
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;
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;
break;
case DEV_IOCTL:
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;
break;
#if !CRAMPED
default:
ip_panic(("illegal case entry"));
#endif
}
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;
switch(m->mq_mess.m_type)
{
case DEV_READ:
r= (*sr_fd->srf_read)(sr_fd->srf_fd,
m->mq_mess.COUNT);
break;
case DEV_WRITE:
r= (*sr_fd->srf_write)(sr_fd->srf_fd,
m->mq_mess.COUNT);
break;
case DEV_IOCTL:
request= m->mq_mess.REQUEST;
#ifdef _IOCPARM_MASK
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);
return OK;
}
#endif
r= (*sr_fd->srf_ioctl)(sr_fd->srf_fd, request);
break;
#if !CRAMPED
default:
ip_panic(("illegal case entry"));
#endif
}
assert(r == OK || r == SUSPEND ||
(printf("r= %d\n", r), 0));
if (r == SUSPEND)
sr_fd->srf_flags |= susp_flag;
return r;
}
PRIVATE int sr_cancel(m)
message *m;
{
sr_fd_t *sr_fd;
int i, result;
mq_t *q_ptr, *q_ptr_prv;
int proc_nr, ref, operation;
result=EINTR;
proc_nr= m->PROC_NR;
ref= 0;
operation= 0;
sr_fd= sr_getchannel(m->DEVICE);
assert (sr_fd);
{
result= walk_queue(sr_fd, sr_fd->srf_ioctl_q,
&sr_fd->srf_ioctl_q_tail, SR_CANCEL_IOCTL,
proc_nr, ref);
if (result != EAGAIN)
return result;
}
{
result= walk_queue(sr_fd, sr_fd->srf_read_q,
&sr_fd->srf_read_q_tail, SR_CANCEL_READ,
proc_nr, ref);
if (result != EAGAIN)
return result;
}
{
result= walk_queue(sr_fd, sr_fd->srf_write_q,
&sr_fd->srf_write_q_tail, SR_CANCEL_WRITE,
proc_nr, ref);
if (result != EAGAIN)
return result;
}
#if !CRAMPED
ip_panic((
"request not found: from %d, type %d, MINOR= %d, PROC= %d, REF= %d OPERATION= %d",
m->m_source, m->m_type, m->DEVICE,
m->PROC_NR, 0, 0));
#endif
}
PRIVATE int walk_queue(sr_fd, q_head, q_tail_ptr, type, proc_nr, ref)
sr_fd_t *sr_fd;
mq_t *q_head, **q_tail_ptr;
int type;
int proc_nr;
int ref;
{
mq_t *q_ptr_prv, *q_ptr;
int result;
for(q_ptr_prv= NULL, q_ptr= q_head; q_ptr;
q_ptr_prv= q_ptr, q_ptr= q_ptr->mq_next)
{
if (q_ptr->mq_mess.PROC_NR != proc_nr)
continue;
if (!q_ptr_prv)
{
result= (*sr_fd->srf_cancel)(sr_fd->srf_fd, type);
assert(result == OK);
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, can_enqueue)
mq_t *mq;
int status;
int can_enqueue;
{
int result, proc, ref,operation;
message reply, *mp;
proc= mq->mq_mess.PROC_NR;
ref= 0;
operation= mq->mq_mess.m_type;
if (can_enqueue)
mp= &mq->mq_mess;
else
mp= &reply;
mp->m_type= REVIVE;
mp->REP_PROC_NR= proc;
mp->REP_STATUS= status;
result= send(mq->mq_mess.m_source, mp);
if (result == ELOCKED && can_enqueue)
{
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 (can_enqueue)
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, **tail_ptr, *m, *tail, *mq;
int ip_flag, susp_flag;
int result;
int suspended;
char *src;
acc_t *acc;
loc_fd= &sr_fd_table[fd];
if (for_ioctl)
{
head_ptr= &loc_fd->srf_ioctl_q;
tail_ptr= &loc_fd->srf_ioctl_q_tail;
ip_flag= SFF_IOCTL_IP;
susp_flag= SFF_IOCTL_SUSP;
}
else
{
head_ptr= &loc_fd->srf_write_q;
tail_ptr= &loc_fd->srf_write_q_tail;
ip_flag= SFF_WRITE_IP;
susp_flag= SFF_WRITE_SUSP;
}
assert (loc_fd->srf_flags & ip_flag);
if (!count)
{
m= *head_ptr;
*head_ptr= NULL;
tail= *tail_ptr;
assert(m);
mq= m->mq_next;
result= (int)offset;
sr_reply (m, result, 1);
suspended= (loc_fd->srf_flags & susp_flag);
loc_fd->srf_flags &= ~(ip_flag|susp_flag);
if (suspended)
{
process_req_q(mq, tail, tail_ptr);
}
else
{
assert(!mq);
}
return NULL;
}
src= (*head_ptr)->mq_mess.ADDRESS + offset;
result= cp_u2b ((*head_ptr)->mq_mess.PROC_NR, 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, **tail_ptr, *m, *tail, *mq;
int ip_flag, susp_flag;
int result;
int suspended;
char *dst;
loc_fd= &sr_fd_table[fd];
if (for_ioctl)
{
head_ptr= &loc_fd->srf_ioctl_q;
tail_ptr= &loc_fd->srf_ioctl_q_tail;
ip_flag= SFF_IOCTL_IP;
susp_flag= SFF_IOCTL_SUSP;
}
else
{
head_ptr= &loc_fd->srf_read_q;
tail_ptr= &loc_fd->srf_read_q_tail;
ip_flag= SFF_READ_IP;
susp_flag= SFF_READ_SUSP;
}
assert (loc_fd->srf_flags & ip_flag);
if (!data)
{
m= *head_ptr;
assert(m);
*head_ptr= NULL;
tail= *tail_ptr;
mq= m->mq_next;
result= (int)offset;
sr_reply (m, result, 1);
suspended= (loc_fd->srf_flags & susp_flag);
loc_fd->srf_flags &= ~(ip_flag|susp_flag);
if (suspended)
{
process_req_q(mq, tail, tail_ptr);
}
else
{
assert(!mq);
}
return OK;
}
dst= (*head_ptr)->mq_mess.ADDRESS + offset;
return cp_b2u (data, (*head_ptr)->mq_mess.PROC_NR, dst);
}
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;
DBLOCK(1, printf("calling rwio\n"));
result= sr_rwio(m);
if (result == SUSPEND)
{
if (mq)
{
(*tail_ptr)->mq_next= mq;
*tail_ptr= tail;
}
return;
}
}
return;
}
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;
cpvec[i].cpv_src= (vir_bytes)src;
cpvec[i].cpv_dst= (vir_bytes)ptr2acc_data(acc);
cpvec[i].cpv_size= size;
src += size;
acc= acc->acc_next;
i++;
if (i == CPVEC_NR || acc == NULL)
{
mess.m_type= SYS_VCOPY;
mess.m1_i1= proc;
mess.m1_i2= this_proc;
mess.m1_i3= i;
mess.m1_p1= (char *)cpvec;
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)
{
cpvec[i].cpv_src= (vir_bytes)ptr2acc_data(acc);
cpvec[i].cpv_dst= (vir_bytes)dest;
cpvec[i].cpv_size= size;
i++;
}
dest += size;
acc= acc->acc_next;
if (i == CPVEC_NR || acc == NULL)
{
mess.m_type= SYS_VCOPY;
mess.m1_i1= this_proc;
mess.m1_i2= proc;
mess.m1_i3= i;
mess.m1_p1= (char *)cpvec;
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;)
{
if (m->mq_mess.REP_PROC_NR == proc)
{
assert(!m_cancel);
m_cancel= m;
m= m->mq_next;
continue;
}
assert(m->mq_mess.m_source != MM_PROC_NR);
assert(m->mq_mess.m_type == REVIVE);
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)
{
assert(m_cancel->mq_mess.m_source != MM_PROC_NR);
assert(m_cancel->mq_mess.m_type == REVIVE);
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 1.9 1996/05/07 21:11:14 philip Exp $
*/