servers/ext2/misc.c

   1 /* Created (MFS based):
   2  *   February 2010 (Evgeniy Ivanov)
   3  */
   4
   5 #include "fs.h"
   6 #include <assert.h>
   7 #include <minix/vfsif.h>
   8 #include <minix/bdev.h>
   9 #include "inode.h"
  10 #include "super.h"
  11
  12 /*===========================================================================*
  13  *                              fs_sync                                      *
  14  *===========================================================================*/
  15 int fs_sync()
  16 {
  17 /* Perform the sync() system call.  Flush all the tables.
  18  * The order in which the various tables are flushed is critical.  The
  19  * blocks must be flushed last, since rw_inode() leaves its results in
  20  * the block cache.
  21  */
  22   struct inode *rip;
  23
  24   assert(lmfs_nr_bufs() > 0);
  25
  26   if (superblock->s_rd_only)
  27         return(OK); /* nothing to sync */
  28
  29   /* Write all the dirty inodes to the disk. */
  30   for(rip = &inode[0]; rip < &inode[NR_INODES]; rip++)
  31         if(rip->i_count > 0 && rip->i_dirt == IN_DIRTY) rw_inode(rip, WRITING);
  32
  33   lmfs_flushall();
  34
  35   if (superblock->s_dev != NO_DEV) {
  36         superblock->s_wtime = clock_time();
  37         write_super(superblock);
  38   }
  39
  40   return(OK);           /* sync() can't fail */
  41 }
  42
  43
  44 /*===========================================================================*
  45  *                              fs_flush                                     *
  46  *===========================================================================*/
  47 int fs_flush()
  48 {
  49 /* Flush the blocks of a device from the cache after writing any dirty blocks
  50  * to disk.
  51  */
  52   dev_t dev = (dev_t) fs_m_in.REQ_DEV;
  53
  54   if(dev == fs_dev) return(EBUSY);
  55
  56   lmfs_flushall();
  57   lmfs_invalidate(dev);
  58
  59   return(OK);
  60 }
  61
  62 /*===========================================================================*
  63  *                              fs_new_driver                                *
  64  *===========================================================================*/
  65 int fs_new_driver(void)
  66 {
  67 /* Set a new driver endpoint for this device. */
  68   dev_t dev;
  69   cp_grant_id_t label_gid;
  70   size_t label_len;
  71   char label[sizeof(fs_dev_label)];
  72   int r;
  73
  74   dev = (dev_t) fs_m_in.REQ_DEV;
  75   label_gid = (cp_grant_id_t) fs_m_in.REQ_GRANT;
  76   label_len = (size_t) fs_m_in.REQ_PATH_LEN;
  77
  78   if (label_len > sizeof(label))
  79         return(EINVAL);
  80
  81   r = sys_safecopyfrom(fs_m_in.m_source, label_gid, (vir_bytes) 0,
  82         (vir_bytes) label, label_len);
  83
  84   if (r != OK) {
  85         printf("ext2: fs_new_driver safecopyfrom failed (%d)\n", r);
  86         return(EINVAL);
  87   }
  88
  89   bdev_driver(dev, label);
  90
  91   return(OK);
  92 }