minix/servers/mfs/main.c

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#include "inc.h"
#include <minix/dmap.h>
#include <minix/endpoint.h>
#include <minix/vfsif.h>
#include "fs.h"
#include "buf.h"
#include "inode.h"
#include "drivers.h"
/* Declare some local functions. */
FORWARD _PROTOTYPE(void init_server, (void) );
FORWARD _PROTOTYPE(void get_work, (message *m_in) );
FORWARD _PROTOTYPE(void cch_check, (void) );
/*===========================================================================*
* main *
*===========================================================================*/
PUBLIC int main(void)
{
/* 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 who_e; /* caller */
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int error, ind;
message m;
/* Initialize the server, then go to work. */
init_server();
fs_m_in.m_type = FS_READY;
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if (send(FS_PROC_NR, &fs_m_in) != OK) {
printf("MFS(%d): Error sending login to VFS\n", SELF_E);
return -1;
}
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#if 0
if (fs_m_in.m_type != REQ_READSUPER_O && fs_m_in.m_type != REQ_READSUPER_S) {
printf("MFS(%d): Invalid login reply\n", SELF_E);
return -1;
}
else {
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if (fs_m_in.m_type == REQ_READSUPER_S)
fs_m_out.m_type = fs_readsuper_s();
else
fs_m_out.m_type = fs_readsuper_o();
reply(FS_PROC_NR, &fs_m_out);
if (fs_m_out.m_type != OK) return -1;
}
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#endif
for (;;) {
/* Wait for request message. */
get_work(&fs_m_in);
error = OK;
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caller_uid = -1; /* To trap errors */
caller_gid = -1;
who_e = fs_m_in.m_source;
if (who_e != FS_PROC_NR) {
if (who_e == 0) {
if(fs_m_in.m_type == PROC_EVENT) {
/* A signal from PM: this means we're getting killed.
* Exit nicely.
*/
fs_sync();
exit(0);
}
}
continue;
}
req_nr = fs_m_in.m_type;
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if (req_nr < VFS_BASE)
{
fs_m_in.m_type += VFS_BASE;
req_nr = fs_m_in.m_type;
}
ind= req_nr-VFS_BASE;
if (ind < 0 || ind >= NREQS) {
printf("mfs: bad request %d\n", req_nr);
printf("ind = %d\n", ind);
error = EINVAL;
}
else {
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error = (*fs_call_vec[ind])();
/*cch_check();*/
}
fs_m_out.m_type = error;
reply(who_e, &fs_m_out);
if (error == OK && rdahed_inode != NIL_INODE) {
read_ahead(); /* do block read ahead */
}
/*
* VFS asks RS to bring down the FS... */
/*
if (req_nr == REQ_UNMOUNT ||
(req_nr == REQ_READSUPER && error != OK)) {
printf("MFS(%d) exit() cachehit: %d cachemiss: %d\n", SELF_E,
inode_cache_hit, inode_cache_miss);
return 0;
}
*/
}
}
/*===========================================================================*
* init_server *
*===========================================================================*/
PRIVATE void init_server(void)
{
int i;
/* Init inode table */
for (i = 0; i < NR_INODES; ++i) {
inode[i].i_count = 0;
cch[i] = 0;
}
init_inode_cache();
/* Init driver mapping */
for (i = 0; i < NR_DEVICES; ++i)
driver_endpoints[i].driver_e = NONE;
SELF_E = getprocnr();
buf_pool();
fs_block_size = _MIN_BLOCK_SIZE;
}
/*===========================================================================*
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* get_work *
*===========================================================================*/
PRIVATE void get_work(m_in)
message *m_in; /* pointer to message */
{
int s; /* receive status */
if (OK != (s = receive(ANY, m_in))) /* wait for message */
panic("MFS","receive failed", s);
}
/*===========================================================================*
* reply *
*===========================================================================*/
PUBLIC void reply(who, m_out)
int who;
message *m_out; /* report result */
{
if (OK != send(who, m_out)) /* send the message */
printf("MFS(%d) was unable to send reply\n", SELF_E);
}
PRIVATE void cch_check(void)
{
int i;
for (i = 0; i < NR_INODES; ++i) {
if (inode[i].i_count != cch[i] &&
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req_nr != REQ_GETNODE &&
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req_nr != REQ_PUTNODE &&
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req_nr != REQ_CLONE_OPCL && req_nr != REQ_READSUPER_S &&
req_nr != REQ_MOUNTPOINT_S && req_nr != REQ_UNMOUNT &&
req_nr != REQ_PIPE && req_nr != REQ_SYNC &&
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req_nr != REQ_LOOKUP_S)
printf("MFS(%d) inode(%d) cc: %d req_nr: %d\n",
SELF_E, inode[i].i_num, inode[i].i_count - cch[i], req_nr);
cch[i] = inode[i].i_count;
}
}