minix/servers/pfs/main.c
Thomas Veerman 5d78cefaf2 Clean up PFS
2010-05-28 09:39:18 +00:00

151 lines
4.1 KiB
C

#include "fs.h"
#include <assert.h>
#include <signal.h>
#include <minix/dmap.h>
#include <minix/endpoint.h>
#include <minix/vfsif.h>
#include "buf.h"
#include "inode.h"
FORWARD _PROTOTYPE(void get_work, (message *m_in) );
/* SEF functions and variables. */
FORWARD _PROTOTYPE( void sef_local_startup, (void) );
FORWARD _PROTOTYPE( int sef_cb_init_fresh, (int type, sef_init_info_t *info) );
FORWARD _PROTOTYPE( void sef_cb_signal_handler, (int signo) );
/*===========================================================================*
* main *
*===========================================================================*/
PUBLIC int main(int argc, char *argv[])
{
/* This is the main routine of this service. The main loop consists of
* three major activities: getting new work, processing the work, and
* sending the reply. The loop never terminates, unless a panic occurs.
*/
int error, ind;
/* SEF local startup. */
env_setargs(argc, argv);
sef_local_startup();
while(!exitsignaled || busy) {
endpoint_t src;
/* Wait for request message. */
get_work(&fs_m_in);
src = fs_m_in.m_source;
error = OK;
caller_uid = INVAL_UID; /* To trap errors */
caller_gid = INVAL_GID;
req_nr = fs_m_in.m_type;
if (req_nr < VFS_BASE) {
fs_m_in.m_type += VFS_BASE;
req_nr = fs_m_in.m_type;
printf("PFS: bad request (no VFS_BASE) %d\n", req_nr);
}
ind = req_nr - VFS_BASE;
if (ind < 0 || ind >= NREQS) {
printf("pfs: bad request %d\n", req_nr);
error = EINVAL;
} else {
error = (*fs_call_vec[ind])();
}
fs_m_out.m_type = error;
reply(src, &fs_m_out);
}
return(OK);
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
PRIVATE void sef_local_startup()
{
/* Register init callbacks. */
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_restart(sef_cb_init_fail);
/* No live update support for now. */
/* Register signal callbacks. */
sef_setcb_signal_handler(sef_cb_signal_handler);
/* Let SEF perform startup. */
sef_startup();
}
/*===========================================================================*
* sef_cb_init_fresh *
*===========================================================================*/
PRIVATE int sef_cb_init_fresh(int type, sef_init_info_t *info)
{
/* Initialize the pipe file server. */
int i;
/* Initialize main loop parameters. */
exitsignaled = 0; /* No exit request seen yet. */
busy = 0; /* Server is not 'busy' (i.e., inodes in use). */
/* Init inode table */
for (i = 0; i < NR_INODES; ++i) {
inode[i].i_count = 0;
}
init_inode_cache();
SELF_E = getprocnr();
buf_pool();
return(OK);
}
/*===========================================================================*
* sef_cb_signal_handler *
*===========================================================================*/
PRIVATE void sef_cb_signal_handler(int signo)
{
/* Only check for termination signal, ignore anything else. */
if (signo != SIGTERM) return;
exitsignaled = 1;
}
/*===========================================================================*
* get_work *
*===========================================================================*/
PRIVATE void get_work(m_in)
message *m_in; /* pointer to message */
{
int r, srcok = 0;
endpoint_t src;
do {
if ((r = sef_receive(ANY, m_in)) != OK) /* wait for message */
panic("sef_receive failed: %d", r);
src = m_in->m_source;
if(src == VFS_PROC_NR) {
srcok = 1; /* Normal FS request. */
} else
printf("PFS: unexpected source %d\n", src);
} while(!srcok);
}
/*===========================================================================*
* reply *
*===========================================================================*/
PUBLIC void reply(who, m_out)
endpoint_t who;
message *m_out; /* report result */
{
if (OK != send(who, m_out)) /* send the message */
printf("PFS(%d) was unable to send reply\n", SELF_E);
}