servers/mfs/misc.c

   1 #include "fs.h"
   2 #include <fcntl.h>
   3 #include <minix/vfsif.h>
   4 #include "buf.h"
   5 #include "inode.h"
   6
   7
   8 /*===========================================================================*
   9  *                              fs_sync                                      *
  10  *===========================================================================*/
  11 PUBLIC int fs_sync()
  12 {
  13 /* Perform the sync() system call.  Flush all the tables.
  14  * The order in which the various tables are flushed is critical.  The
  15  * blocks must be flushed last, since rw_inode() leaves its results in
  16  * the block cache.
  17  */
  18   struct inode *rip;
  19   struct buf *bp;
  20
  21   /* Write all the dirty inodes to the disk. */
  22   for(rip = &inode[0]; rip < &inode[NR_INODES]; rip++)
  23           if(rip->i_count > 0 && rip->i_dirt == DIRTY) rw_inode(rip, WRITING);
  24
  25   /* Write all the dirty blocks to the disk, one drive at a time. */
  26   for(bp = &buf[0]; bp < &buf[NR_BUFS]; bp++)
  27           if(bp->b_dev != NO_DEV && bp->b_dirt == DIRTY)
  28                   flushall(bp->b_dev);
  29
  30   return(OK);           /* sync() can't fail */
  31 }
  32
  33
  34 /*===========================================================================*
  35  *                              fs_flush                                     *
  36  *===========================================================================*/
  37 PUBLIC int fs_flush()
  38 {
  39 /* Flush the blocks of a device from the cache after writing any dirty blocks
  40  * to disk.
  41  */
  42   dev_t dev;
  43
  44   dev = fs_m_in.REQ_DEV;
  45   if(dev == fs_dev) return(EBUSY);
  46
  47   flushall(dev);
  48   invalidate(dev);
  49
  50   return(OK);
  51 }
  52