minix/servers/mfs/main.c

#include "inc.h"
#include <assert.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(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;
  message m;

  /* Initialize the server, then go to work. */
  init_server();	

  fs_m_in.m_type = FS_READY;

  if (send(FS_PROC_NR, &fs_m_in) != OK) {
	printf("MFS(%d): Error sending login to VFS\n", SELF_E);
	return(-1);
  }

  while(!unmountdone || !exitsignaled) {
	endpoint_t src;

	/* Wait for request message. */
	get_work(&fs_m_in);
	
	src = fs_m_in.m_source;
	error = OK;
	caller_uid = -1;	/* To trap errors */
	caller_gid = -1;

	/* Exit request? */
	if(src == PM_PROC_NR) {
		exitsignaled = 1;
		fs_sync();
		continue;
	}

	/* This must be a regular VFS request. */
	assert(src == VFS_PROC_NR && !unmountdone);

	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;
	}
	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 {
		error = (*fs_call_vec[ind])();
		/*cch_check();*/
	}

	fs_m_out.m_type = error; 
	reply(src, &fs_m_out);

	if (error == OK && rdahed_inode != NIL_INODE) 
		read_ahead(); /* do block read ahead */
      
  }
}


/*===========================================================================*
 *				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;
}


/*===========================================================================*
 *				get_work				     *
 *===========================================================================*/
PRIVATE void get_work(m_in)
message *m_in;				/* pointer to message */
{
  int r, srcok = 0;
  endpoint_t src;

  do {
	if ((r = receive(ANY, m_in)) != OK) 	/* wait for message */
		panic("MFS","receive failed", r);
	src = fs_m_in.m_source;

	if (src != FS_PROC_NR) {
		if(src == PM_PROC_NR) {
			if(is_notify(fs_m_in.m_type))
				srcok = 1;	/* Normal exit request. */
		    	else
				printf("MFS: unexpected message from PM\n");
		} else
			printf("MFS: unexpected source %d\n", src);
	} else if(src == FS_PROC_NR) {
		if(unmountdone) 
			printf("MFS: unmounted: unexpected message from FS\n");
		else 
			srcok = 1;		/* Normal FS request. */
		
	} else
		printf("MFS: unexpected source %d\n", src);
  } while(!srcok);

   assert((src == FS_PROC_NR && !unmountdone) || 
	(src == PM_PROC_NR && is_notify(fs_m_in.m_type)));
}


/*===========================================================================*
 *				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);
}


/*===========================================================================*
 *				cch_check				     *	
 *===========================================================================*/
PRIVATE void cch_check(void) 
{
  int i;

  for (i = 0; i < NR_INODES; ++i) {
	  if (inode[i].i_count != cch[i] &&
		req_nr != REQ_GETNODE &&
		req_nr != REQ_PUTNODE &&
		req_nr != REQ_READSUPER &&
		req_nr != REQ_MOUNTPOINT && req_nr != REQ_UNMOUNT &&
		req_nr != REQ_SYNC && req_nr != REQ_LOOKUP)
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;
  }
}