servers/mfs/misc.c

   1 #include "fs.h"
   2 #include <assert.h>
   3 #include <minix/vfsif.h>
   4 #include <minix/bdev.h>
   5 #include "inode.h"
   6 #include "clean.h"
   7
   8 /*===========================================================================*
   9  *                              fs_sync                                      *
  10  *===========================================================================*/
  11 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
  20   assert(lmfs_nr_bufs() > 0);
  21
  22   /* Write all the dirty inodes to the disk. */
  23   for(rip = &inode[0]; rip < &inode[NR_INODES]; rip++)
  24           if(rip->i_count > 0 && IN_ISDIRTY(rip)) rw_inode(rip, WRITING);
  25
  26   /* Write all the dirty blocks to the disk. */
  27   lmfs_flushall();
  28
  29   return(OK);           /* sync() can't fail */
  30 }
  31
  32
  33 /*===========================================================================*
  34  *                              fs_flush                                     *
  35  *===========================================================================*/
  36 int fs_flush()
  37 {
  38 /* Flush the blocks of a device from the cache after writing any dirty blocks
  39  * to disk.
  40  */
  41   dev_t dev = (dev_t) fs_m_in.REQ_DEV;
  42   if(dev == fs_dev) return(EBUSY);
  43
  44   lmfs_flushall();
  45   lmfs_invalidate(dev);
  46
  47   return(OK);
  48 }
  49
  50
  51 /*===========================================================================*
  52  *                              fs_new_driver                                *
  53  *===========================================================================*/
  54 int fs_new_driver(void)
  55 {
  56 /* Set a new driver endpoint for this device. */
  57   dev_t dev;
  58   cp_grant_id_t label_gid;
  59   size_t label_len;
  60   char label[sizeof(fs_dev_label)];
  61   int r;
  62
  63   dev = (dev_t) fs_m_in.REQ_DEV;
  64   label_gid = (cp_grant_id_t) fs_m_in.REQ_GRANT;
  65   label_len = (size_t) fs_m_in.REQ_PATH_LEN;
  66
  67   if (label_len > sizeof(label))
  68         return(EINVAL);
  69
  70   r = sys_safecopyfrom(fs_m_in.m_source, label_gid, (vir_bytes) 0,
  71         (vir_bytes) label, label_len);
  72
  73   if (r != OK) {
  74         printf("MFS: fs_new_driver safecopyfrom failed (%d)\n", r);
  75         return(EINVAL);
  76   }
  77
  78   bdev_driver(dev, label);
  79
  80   return(OK);
  81 }