servers/mfs/misc.c

   1
   2 #include "fs.h"
   3 #include <fcntl.h>
   4 #include <minix/vfsif.h>
   5
   6 #include "buf.h"
   7 #include "inode.h"
   8
   9
  10 /*===========================================================================*
  11  *                              fs_sync                                      *
  12  *===========================================================================*/
  13 PUBLIC int fs_sync()
  14 {
  15 /* Perform the sync() system call.  Flush all the tables.
  16  * The order in which the various tables are flushed is critical.  The
  17  * blocks must be flushed last, since rw_inode() leaves its results in
  18  * the block cache.
  19  */
  20   register struct inode *rip;
  21   register struct buf *bp;
  22
  23   /* Write all the dirty inodes to the disk. */
  24   for (rip = &inode[0]; rip < &inode[NR_INODES]; rip++)
  25         if (rip->i_count > 0 && rip->i_dirt == DIRTY) rw_inode(rip, WRITING);
  26
  27   /* Write all the dirty blocks to the disk, one drive at a time. */
  28   for (bp = &buf[0]; bp < &buf[NR_BUFS]; bp++)
  29         if (bp->b_dev != NO_DEV && bp->b_dirt == DIRTY)
  30             flushall(bp->b_dev);
  31
  32   return(OK);           /* sync() can't fail */
  33 }
  34
  35
  36 /*===========================================================================*
  37  *                              fs_flush                                     *
  38  *===========================================================================*/
  39 PUBLIC int fs_flush()
  40 {
  41 /* Flush the blocks of a device from the cache after writing any dirty blocks
  42  * to disk.
  43  */
  44   dev_t dev;
  45
  46   dev= fs_m_in.REQ_DEV;
  47   if (dev == fs_dev)
  48   {
  49         return EBUSY;
  50   }
  51   flushall(dev);
  52   invalidate(dev);
  53
  54   return(OK);
  55 }
  56
  57