1060 lines
21 KiB
C
1060 lines
21 KiB
C
/* this file contains the interface of the network software with the file
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* system.
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*
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* Copyright 1995 Philip Homburg
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*
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* The valid messages and their parameters are:
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*
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* Requests:
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*
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* m_type DEVICE IO_ENDPT COUNT
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* --------------------------------------------------
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* | DEV_OPEN | minor dev | proc nr | mode |
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* |-------------+-----------+-----------+----------+
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* | DEV_CLOSE | minor dev | proc nr | |
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* |-------------+-----------+-----------+----------+
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*
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* m_type DEVICE IO_ENDPT COUNT IO_GRANT
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* ---------------------------------------------------------------
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* | DEV_READ_S | minor dev | proc nr | count | grant ID |
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* |-------------+-----------+-----------+-----------+-----------|
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* | DEV_WRITE_S | minor dev | proc nr | count | grant ID |
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* |-------------+-----------+-----------+-----------+-----------|
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* | DEV_IOCTL_S | minor dev | proc nr | command | grant ID |
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* |-------------+-----------+-----------+-----------+-----------|
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* | DEV_SELECT | minor dev | ops | | |
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* |-------------+-----------+-----------+-----------+-----------|
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*
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* m_type
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* --------------|
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* | DEV_STATUS |
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* |-------------|
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*
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* m_type DEVICE IO_ENDPT COUNT
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* --------------------------------------------------|
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* | CANCEL | minor dev | proc nr | mode |
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* |-------------+-----------+-----------+-----------|
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*
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* Replies:
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*
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* m_type REP_ENDPT REP_STATUS REP_IO_GRANT
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* -------------------------------------------------------|
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* | TASK_REPLY | proc nr | status | grant ID |
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* |---------------+-----------+-----------+--------------|
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*
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* m_type REP_ENDPT REP_STATUS REP_IO_GRANT
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* ----------------+-----------+--------------------------|
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* | DEV_REVIVE | proc nr | | grant ID |
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* |---------------+-----------+-----------+--------------|
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* | DEV_IO_READY | minor dev | sel ops | |
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* |---------------+-----------+-----------+--------------|
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* | DEV_NO_STATUS | | | |
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* |---------------+-----------+-----------+--------------|
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*/
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#include "inet.h"
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#include <sys/svrctl.h>
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#include <minix/callnr.h>
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#include "mq.h"
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#include "qp.h"
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#include "proto.h"
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#include "generic/type.h"
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#include "generic/assert.h"
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#include "generic/buf.h"
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#include "generic/event.h"
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#include "generic/sr.h"
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#include "sr_int.h"
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THIS_FILE
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PUBLIC sr_fd_t sr_fd_table[FD_NR];
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PRIVATE mq_t *repl_queue, *repl_queue_tail;
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PRIVATE struct vscp_vec s_cp_req[SCPVEC_NR];
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FORWARD _PROTOTYPE ( int sr_open, (message *m) );
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FORWARD _PROTOTYPE ( void sr_close, (message *m) );
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FORWARD _PROTOTYPE ( int sr_rwio, (mq_t *m) );
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FORWARD _PROTOTYPE ( int sr_restart_read, (sr_fd_t *fdp) );
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FORWARD _PROTOTYPE ( int sr_restart_write, (sr_fd_t *fdp) );
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FORWARD _PROTOTYPE ( int sr_restart_ioctl, (sr_fd_t *fdp) );
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FORWARD _PROTOTYPE ( int sr_cancel, (message *m) );
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FORWARD _PROTOTYPE ( int sr_select, (message *m) );
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FORWARD _PROTOTYPE ( void sr_status, (message *m) );
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FORWARD _PROTOTYPE ( void sr_reply_, (mq_t *m, int reply, int is_revive) );
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FORWARD _PROTOTYPE ( sr_fd_t *sr_getchannel, (int minor));
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FORWARD _PROTOTYPE ( acc_t *sr_get_userdata, (int fd, size_t offset,
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size_t count, int for_ioctl) );
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FORWARD _PROTOTYPE ( int sr_put_userdata, (int fd, size_t offset,
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acc_t *data, int for_ioctl) );
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FORWARD _PROTOTYPE (void sr_select_res, (int fd, unsigned ops) );
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FORWARD _PROTOTYPE ( int sr_repl_queue, (int proc, int ref, int operation) );
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FORWARD _PROTOTYPE ( int walk_queue, (sr_fd_t *sr_fd, mq_t **q_head_ptr,
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mq_t **q_tail_ptr, int type, int proc_nr, int ref, int first_flag) );
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FORWARD _PROTOTYPE ( void process_req_q, (mq_t *mq, mq_t *tail,
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mq_t **tail_ptr) );
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FORWARD _PROTOTYPE ( void sr_event, (event_t *evp, ev_arg_t arg) );
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FORWARD _PROTOTYPE ( int cp_u2b, (int proc, int gid, vir_bytes offset,
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acc_t **var_acc_ptr, int size) );
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FORWARD _PROTOTYPE ( int cp_b2u, (acc_t *acc_ptr, int proc, int gid,
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vir_bytes offset) );
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PUBLIC void sr_init()
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{
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int i;
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for (i=0; i<FD_NR; i++)
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{
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sr_fd_table[i].srf_flags= SFF_FREE;
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ev_init(&sr_fd_table[i].srf_ioctl_ev);
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ev_init(&sr_fd_table[i].srf_read_ev);
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ev_init(&sr_fd_table[i].srf_write_ev);
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}
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repl_queue= NULL;
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}
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PUBLIC void sr_rec(m)
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mq_t *m;
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{
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int result;
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int send_reply, free_mess;
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if (repl_queue)
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{
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if (m->mq_mess.m_type == CANCEL)
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{
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result= sr_repl_queue(m->mq_mess.IO_ENDPT,
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(int)m->mq_mess.IO_GRANT, 0);
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if (result)
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{
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mq_free(m);
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return; /* canceled request in queue */
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}
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}
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#if 0
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else
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sr_repl_queue(ANY, 0, 0);
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#endif
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}
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switch (m->mq_mess.m_type)
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{
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case DEV_OPEN:
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result= sr_open(&m->mq_mess);
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send_reply= 1;
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free_mess= 1;
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break;
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case DEV_CLOSE:
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sr_close(&m->mq_mess);
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result= OK;
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send_reply= 1;
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free_mess= 1;
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break;
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case DEV_READ_S:
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case DEV_WRITE_S:
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case DEV_IOCTL_S:
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result= sr_rwio(m);
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assert(result == OK || result == SUSPEND);
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send_reply= (result == SUSPEND);
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free_mess= 0;
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break;
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case CANCEL:
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result= sr_cancel(&m->mq_mess);
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assert(result == OK || result == EINTR);
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send_reply= (result == EINTR);
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free_mess= 1;
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m->mq_mess.m_type= 0;
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break;
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case DEV_SELECT:
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result= sr_select(&m->mq_mess);
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send_reply= 1;
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free_mess= 1;
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break;
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case DEV_STATUS:
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sr_status(&m->mq_mess);
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result= OK; /* Satisfy lint. */
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send_reply= 0;
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free_mess= 1;
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break;
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default:
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ip_panic(("unknown message, from %d, type %d",
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m->mq_mess.m_source, m->mq_mess.m_type));
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}
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if (send_reply)
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{
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sr_reply_(m, result, FALSE /* !is_revive */);
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}
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if (free_mess)
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mq_free(m);
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}
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PUBLIC void sr_add_minor(minor, port, openf, closef, readf, writef,
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ioctlf, cancelf, selectf)
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int minor;
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int port;
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sr_open_t openf;
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sr_close_t closef;
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sr_read_t readf;
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sr_write_t writef;
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sr_ioctl_t ioctlf;
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sr_cancel_t cancelf;
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sr_select_t selectf;
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{
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sr_fd_t *sr_fd;
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assert (minor>=0 && minor<FD_NR);
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sr_fd= &sr_fd_table[minor];
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assert(!(sr_fd->srf_flags & SFF_INUSE));
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sr_fd->srf_flags= SFF_INUSE | SFF_MINOR;
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sr_fd->srf_port= port;
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sr_fd->srf_open= openf;
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sr_fd->srf_close= closef;
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sr_fd->srf_write= writef;
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sr_fd->srf_read= readf;
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sr_fd->srf_ioctl= ioctlf;
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sr_fd->srf_cancel= cancelf;
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sr_fd->srf_select= selectf;
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}
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PRIVATE int sr_open(m)
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message *m;
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{
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sr_fd_t *sr_fd;
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int minor= m->DEVICE;
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int i, fd;
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if (minor<0 || minor>FD_NR)
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{
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DBLOCK(1, printf("replying EINVAL\n"));
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return EINVAL;
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}
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if (!(sr_fd_table[minor].srf_flags & SFF_MINOR))
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{
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DBLOCK(1, printf("replying ENXIO\n"));
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return ENXIO;
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}
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for (i=0; i<FD_NR && (sr_fd_table[i].srf_flags & SFF_INUSE); i++);
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if (i>=FD_NR)
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{
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DBLOCK(1, printf("replying ENFILE\n"));
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return ENFILE;
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}
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sr_fd= &sr_fd_table[i];
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*sr_fd= sr_fd_table[minor];
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sr_fd->srf_flags= SFF_INUSE;
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fd= (*sr_fd->srf_open)(sr_fd->srf_port, i, sr_get_userdata,
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sr_put_userdata, 0 /* no put_pkt */, sr_select_res);
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if (fd<0)
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{
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sr_fd->srf_flags= SFF_FREE;
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DBLOCK(1, printf("replying %d\n", fd));
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return fd;
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}
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sr_fd->srf_fd= fd;
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return i;
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}
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PRIVATE void sr_close(m)
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message *m;
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{
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sr_fd_t *sr_fd;
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sr_fd= sr_getchannel(m->DEVICE);
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assert (sr_fd);
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if (sr_fd->srf_flags & SFF_BUSY)
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ip_panic(("close on busy channel"));
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assert (!(sr_fd->srf_flags & SFF_MINOR));
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(*sr_fd->srf_close)(sr_fd->srf_fd);
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sr_fd->srf_flags= SFF_FREE;
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}
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PRIVATE int sr_rwio(m)
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mq_t *m;
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{
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sr_fd_t *sr_fd;
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mq_t **q_head_ptr, **q_tail_ptr;
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int ip_flag, susp_flag, first_flag;
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int r;
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ioreq_t request;
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size_t size;
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sr_fd= sr_getchannel(m->mq_mess.DEVICE);
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assert (sr_fd);
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switch(m->mq_mess.m_type)
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{
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case DEV_READ_S:
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q_head_ptr= &sr_fd->srf_read_q;
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q_tail_ptr= &sr_fd->srf_read_q_tail;
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ip_flag= SFF_READ_IP;
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susp_flag= SFF_READ_SUSP;
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first_flag= SFF_READ_FIRST;
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break;
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case DEV_WRITE_S:
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q_head_ptr= &sr_fd->srf_write_q;
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q_tail_ptr= &sr_fd->srf_write_q_tail;
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ip_flag= SFF_WRITE_IP;
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susp_flag= SFF_WRITE_SUSP;
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first_flag= SFF_WRITE_FIRST;
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break;
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case DEV_IOCTL_S:
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q_head_ptr= &sr_fd->srf_ioctl_q;
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q_tail_ptr= &sr_fd->srf_ioctl_q_tail;
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ip_flag= SFF_IOCTL_IP;
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susp_flag= SFF_IOCTL_SUSP;
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first_flag= SFF_IOCTL_FIRST;
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break;
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default:
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ip_panic(("illegal case entry"));
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}
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if (sr_fd->srf_flags & ip_flag)
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{
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assert(sr_fd->srf_flags & susp_flag);
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assert(*q_head_ptr);
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(*q_tail_ptr)->mq_next= m;
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*q_tail_ptr= m;
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return SUSPEND;
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}
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assert(!*q_head_ptr);
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*q_tail_ptr= *q_head_ptr= m;
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sr_fd->srf_flags |= ip_flag;
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assert(!(sr_fd->srf_flags & first_flag));
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sr_fd->srf_flags |= first_flag;
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switch(m->mq_mess.m_type)
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{
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case DEV_READ_S:
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r= (*sr_fd->srf_read)(sr_fd->srf_fd,
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m->mq_mess.COUNT);
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break;
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case DEV_WRITE_S:
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r= (*sr_fd->srf_write)(sr_fd->srf_fd,
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m->mq_mess.COUNT);
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break;
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case DEV_IOCTL_S:
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request= m->mq_mess.REQUEST;
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size= (request >> 16) & _IOCPARM_MASK;
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if (size>MAX_IOCTL_S)
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{
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DBLOCK(1, printf("replying EINVAL\n"));
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r= sr_put_userdata(sr_fd-sr_fd_table, EINVAL,
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NULL, 1);
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assert(r == OK);
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assert(sr_fd->srf_flags & first_flag);
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sr_fd->srf_flags &= ~first_flag;
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return OK;
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}
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r= (*sr_fd->srf_ioctl)(sr_fd->srf_fd, request);
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break;
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default:
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ip_panic(("illegal case entry"));
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}
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assert(sr_fd->srf_flags & first_flag);
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sr_fd->srf_flags &= ~first_flag;
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assert(r == OK || r == SUSPEND ||
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(printf("r= %d\n", r), 0));
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if (r == SUSPEND)
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sr_fd->srf_flags |= susp_flag;
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else
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mq_free(m);
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return r;
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}
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PRIVATE int sr_restart_read(sr_fd)
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sr_fd_t *sr_fd;
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{
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mq_t *mp;
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int r;
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mp= sr_fd->srf_read_q;
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assert(mp);
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if (sr_fd->srf_flags & SFF_READ_IP)
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{
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assert(sr_fd->srf_flags & SFF_READ_SUSP);
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return SUSPEND;
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}
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sr_fd->srf_flags |= SFF_READ_IP;
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r= (*sr_fd->srf_read)(sr_fd->srf_fd,
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mp->mq_mess.COUNT);
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assert(r == OK || r == SUSPEND ||
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(printf("r= %d\n", r), 0));
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if (r == SUSPEND)
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sr_fd->srf_flags |= SFF_READ_SUSP;
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return r;
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}
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PRIVATE int sr_restart_write(sr_fd)
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sr_fd_t *sr_fd;
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{
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mq_t *mp;
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int r;
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mp= sr_fd->srf_write_q;
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assert(mp);
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if (sr_fd->srf_flags & SFF_WRITE_IP)
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{
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assert(sr_fd->srf_flags & SFF_WRITE_SUSP);
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return SUSPEND;
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}
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sr_fd->srf_flags |= SFF_WRITE_IP;
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r= (*sr_fd->srf_write)(sr_fd->srf_fd,
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mp->mq_mess.COUNT);
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assert(r == OK || r == SUSPEND ||
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(printf("r= %d\n", r), 0));
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if (r == SUSPEND)
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sr_fd->srf_flags |= SFF_WRITE_SUSP;
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return r;
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}
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PRIVATE int sr_restart_ioctl(sr_fd)
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sr_fd_t *sr_fd;
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{
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mq_t *mp;
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int r;
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mp= sr_fd->srf_ioctl_q;
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assert(mp);
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if (sr_fd->srf_flags & SFF_IOCTL_IP)
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{
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assert(sr_fd->srf_flags & SFF_IOCTL_SUSP);
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return SUSPEND;
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}
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sr_fd->srf_flags |= SFF_IOCTL_IP;
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r= (*sr_fd->srf_ioctl)(sr_fd->srf_fd,
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mp->mq_mess.COUNT);
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assert(r == OK || r == SUSPEND ||
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(printf("r= %d\n", r), 0));
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if (r == SUSPEND)
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sr_fd->srf_flags |= SFF_IOCTL_SUSP;
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return r;
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}
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|
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PRIVATE int sr_cancel(m)
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message *m;
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{
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sr_fd_t *sr_fd;
|
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int result;
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int proc_nr, ref;
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result=EINTR;
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proc_nr= m->IO_ENDPT;
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ref= (int)m->IO_GRANT;
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sr_fd= sr_getchannel(m->DEVICE);
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assert (sr_fd);
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result= walk_queue(sr_fd, &sr_fd->srf_ioctl_q,
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&sr_fd->srf_ioctl_q_tail, SR_CANCEL_IOCTL,
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proc_nr, ref, SFF_IOCTL_FIRST);
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if (result != EAGAIN)
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return result;
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|
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result= walk_queue(sr_fd, &sr_fd->srf_read_q,
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&sr_fd->srf_read_q_tail, SR_CANCEL_READ,
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proc_nr, ref, SFF_READ_FIRST);
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if (result != EAGAIN)
|
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return result;
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|
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result= walk_queue(sr_fd, &sr_fd->srf_write_q,
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&sr_fd->srf_write_q_tail, SR_CANCEL_WRITE,
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proc_nr, ref, SFF_WRITE_FIRST);
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if (result != EAGAIN)
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return result;
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|
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ip_panic((
|
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"request not found: from %d, type %d, MINOR= %d, PROC= %d, REF= %d",
|
|
m->m_source, m->m_type, m->DEVICE,
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m->IO_ENDPT, m->IO_GRANT));
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}
|
|
|
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PRIVATE int sr_select(m)
|
|
message *m;
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{
|
|
sr_fd_t *sr_fd;
|
|
int r;
|
|
unsigned m_ops, i_ops;
|
|
|
|
sr_fd= sr_getchannel(m->DEVICE);
|
|
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"));
|
|
}
|
|
|
|
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.IO_ENDPT != proc_nr)
|
|
continue;
|
|
if ((int)q_ptr->mq_mess.IO_GRANT != ref)
|
|
continue;
|
|
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;
|
|
message reply, *mp;
|
|
|
|
proc= mq->mq_mess.IO_ENDPT;
|
|
ref= (int)mq->mq_mess.IO_GRANT;
|
|
|
|
if (is_revive)
|
|
mp= &mq->mq_mess;
|
|
else
|
|
mp= &reply;
|
|
|
|
mp->m_type= TASK_REPLY;
|
|
mp->REP_ENDPT= proc;
|
|
mp->REP_STATUS= status;
|
|
mp->REP_IO_GRANT= ref;
|
|
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;
|
|
size_t offset;
|
|
size_t 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;
|
|
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;
|
|
}
|
|
|
|
result= cp_u2b ((*head_ptr)->mq_mess.IO_ENDPT,
|
|
(int)(*head_ptr)->mq_mess.IO_GRANT, offset, &acc, count);
|
|
|
|
return result<0 ? NULL : acc;
|
|
}
|
|
|
|
PRIVATE int sr_put_userdata (fd, offset, data, for_ioctl)
|
|
int fd;
|
|
size_t 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;
|
|
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;
|
|
}
|
|
|
|
return cp_b2u (data, (*head_ptr)->mq_mess.IO_ENDPT,
|
|
(int)(*head_ptr)->mq_mess.IO_GRANT, offset);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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: unknown event\n"));
|
|
}
|
|
|
|
PRIVATE int cp_u2b(proc, gid, offset, var_acc_ptr, size)
|
|
int proc;
|
|
int gid;
|
|
vir_bytes offset;
|
|
acc_t **var_acc_ptr;
|
|
int size;
|
|
{
|
|
acc_t *acc;
|
|
int i, r;
|
|
|
|
acc= bf_memreq(size);
|
|
|
|
*var_acc_ptr= acc;
|
|
i=0;
|
|
|
|
while (acc)
|
|
{
|
|
size= (vir_bytes)acc->acc_length;
|
|
|
|
s_cp_req[i].v_from= proc;
|
|
s_cp_req[i].v_to= SELF;
|
|
s_cp_req[i].v_gid= gid;
|
|
s_cp_req[i].v_offset= offset;
|
|
s_cp_req[i].v_addr= (vir_bytes) ptr2acc_data(acc);
|
|
s_cp_req[i].v_bytes= size;
|
|
|
|
offset += size;
|
|
acc= acc->acc_next;
|
|
i++;
|
|
|
|
if (acc == NULL && i == 1)
|
|
{
|
|
r= sys_safecopyfrom(s_cp_req[0].v_from,
|
|
s_cp_req[0].v_gid, s_cp_req[0].v_offset,
|
|
s_cp_req[0].v_addr, s_cp_req[0].v_bytes, D);
|
|
if (r <0)
|
|
{
|
|
printf("sys_safecopyfrom failed: %d\n", r);
|
|
bf_afree(*var_acc_ptr);
|
|
*var_acc_ptr= 0;
|
|
return r;
|
|
}
|
|
i= 0;
|
|
continue;
|
|
}
|
|
if (i == SCPVEC_NR || acc == NULL)
|
|
{
|
|
r= sys_vsafecopy(s_cp_req, i);
|
|
|
|
if (r <0)
|
|
{
|
|
printf("cp_u2b: sys_vsafecopy failed: %d\n",
|
|
r);
|
|
bf_afree(*var_acc_ptr);
|
|
*var_acc_ptr= 0;
|
|
return r;
|
|
}
|
|
i= 0;
|
|
}
|
|
}
|
|
return OK;
|
|
}
|
|
|
|
PRIVATE int cp_b2u(acc_ptr, proc, gid, offset)
|
|
acc_t *acc_ptr;
|
|
int proc;
|
|
int gid;
|
|
vir_bytes offset;
|
|
{
|
|
acc_t *acc;
|
|
int i, r, size;
|
|
|
|
acc= acc_ptr;
|
|
i=0;
|
|
|
|
while (acc)
|
|
{
|
|
size= (vir_bytes)acc->acc_length;
|
|
|
|
if (size)
|
|
{
|
|
s_cp_req[i].v_from= SELF;
|
|
s_cp_req[i].v_to= proc;
|
|
s_cp_req[i].v_gid= gid;
|
|
s_cp_req[i].v_offset= offset;
|
|
s_cp_req[i].v_addr= (vir_bytes) ptr2acc_data(acc);
|
|
s_cp_req[i].v_bytes= size;
|
|
|
|
i++;
|
|
}
|
|
|
|
offset += size;
|
|
acc= acc->acc_next;
|
|
|
|
if (acc == NULL && i == 1)
|
|
{
|
|
r= sys_safecopyto(s_cp_req[0].v_to,
|
|
s_cp_req[0].v_gid, s_cp_req[0].v_offset,
|
|
s_cp_req[0].v_addr, s_cp_req[0].v_bytes, D);
|
|
if (r <0)
|
|
{
|
|
printf("sys_safecopyto failed: %d\n", r);
|
|
bf_afree(acc_ptr);
|
|
return r;
|
|
}
|
|
i= 0;
|
|
continue;
|
|
}
|
|
if (i == SCPVEC_NR || acc == NULL)
|
|
{
|
|
r= sys_vsafecopy(s_cp_req, i);
|
|
|
|
if (r <0)
|
|
{
|
|
printf("cp_b2u: sys_vsafecopy failed: %d\n",
|
|
r);
|
|
bf_afree(acc_ptr);
|
|
return r;
|
|
}
|
|
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;
|
|
mq_t *new_queue;
|
|
int result;
|
|
|
|
m_cancel= NULL;
|
|
new_queue= NULL;
|
|
|
|
for (m= repl_queue; m;)
|
|
{
|
|
if (m->mq_mess.REP_ENDPT == proc &&
|
|
m->mq_mess.REP_IO_GRANT == ref)
|
|
{
|
|
assert(!m_cancel);
|
|
m_cancel= m;
|
|
m= m->mq_next;
|
|
continue;
|
|
}
|
|
m_tmp= m;
|
|
m= m->mq_next;
|
|
m_tmp->mq_next= new_queue;
|
|
new_queue= m_tmp;
|
|
}
|
|
repl_queue= new_queue;
|
|
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 $
|
|
*/
|