minix/servers/mfs/misc.c

#include "fs.h"
#include <fcntl.h>
#include <minix/vfsif.h>

#include "buf.h"
#include "inode.h"


/*===========================================================================*
 *				fs_sync					     *
 *===========================================================================*/
PUBLIC int fs_sync()
{
/* Perform the sync() system call.  Flush all the tables. 
 * The order in which the various tables are flushed is critical.  The
 * blocks must be flushed last, since rw_inode() leaves its results in
 * the block cache.
 */
  register struct inode *rip;
  register struct buf *bp;

  /* Write all the dirty inodes to the disk. */
  for (rip = &inode[0]; rip < &inode[NR_INODES]; rip++)
	if (rip->i_count > 0 && rip->i_dirt == DIRTY) rw_inode(rip, WRITING);

  /* Write all the dirty blocks to the disk, one drive at a time. */
  for (bp = &buf[0]; bp < &buf[NR_BUFS]; bp++)
	if (bp->b_dev != NO_DEV && bp->b_dirt == DIRTY) 
            flushall(bp->b_dev);

  return(OK);		/* sync() can't fail */
}


/*===========================================================================*
 *				fs_flush				     *
 *===========================================================================*/
PUBLIC int fs_flush()
{
/* Flush the blocks of a device from the cache after writing any dirty blocks
 * to disk.
 */
  dev_t dev;

  dev= fs_m_in.REQ_DEV;
  if (dev == fs_dev)
  {
	printf("fs_flush: not flushing block for mounted filsystem\n");
	return EBUSY;
  }
  flushall(dev);
  invalidate(dev);

  return(OK);
}