mfs: minor cleanup of readahead: they can be private to read.c.

servers/mfs/glo.h

@@ -9,9 +9,6 @@
 
 #include <minix/vfsif.h>
 
-EXTERN off_t rdahedpos;		/* position to read ahead */
-EXTERN struct inode *rdahed_inode;	/* pointer to inode to read ahead */
-
 /* The following variables are used for returning results to the caller. */
 EXTERN int err_code;		/* temporary storage for error number */
 EXTERN int rdwt_err;		/* status of last disk i/o request */

servers/mfs/main.c

@@ -67,7 +67,7 @@ PUBLIC int main(int argc, char *argv[])
 	fs_m_out.m_type = error; 
 	reply(src, &fs_m_out);
 
-	if (error == OK && rdahed_inode != NULL) 
+	if (error == OK) 
 		read_ahead(); /* do block read ahead */
       
   }

servers/mfs/read.c

@@ -20,6 +20,9 @@ FORWARD _PROTOTYPE( int rw_chunk, (struct inode *rip, u64_t position,
 
 PRIVATE char getdents_buf[GETDENTS_BUFSIZ];
 
+PRIVATE off_t rdahedpos;         /* position to read ahead */
+PRIVATE struct inode *rdahed_inode;      /* pointer to inode to read ahead */
+
 /*===========================================================================*
  *				fs_readwrite				     *
  *===========================================================================*/
@@ -401,6 +404,9 @@ PUBLIC void read_ahead()
   struct buf *bp;
   block_t b;
 
+  if(!rdahed_inode)
+	return;
+
   rip = rdahed_inode;		/* pointer to inode to read ahead from */
   block_size = get_block_size(rip->i_dev);
   rdahed_inode = NULL;	/* turn off read ahead */