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   struct buf *bp;
  24
  25   assert(nr_bufs > 0);
  26   assert(buf);
  27
  28   if (superblock->s_rd_only)
  29         return(OK); /* nothing to sync */
  30
  31   /* Write all the dirty inodes to the disk. */
  32   for(rip = &inode[0]; rip < &inode[NR_INODES]; rip++)
  33         if(rip->i_count > 0 && rip->i_dirt == DIRTY) rw_inode(rip, WRITING);
  34
  35   /* Write all the dirty blocks to the disk, one drive at a time. */
  36   for(bp = &buf[0]; bp < &buf[nr_bufs]; bp++)
  37         if(bp->b_dev != NO_DEV && bp->b_dirt == DIRTY)
  38                 flushall(bp->b_dev);
  39
  40   if (superblock->s_dev != NO_DEV) {
  41         superblock->s_wtime = clock_time();
  42         write_super(superblock);
  43   }
  44
  45   return(OK);           /* sync() can't fail */
  46 }
  47
  48
  49 /*===========================================================================*
  50  *                              fs_flush                                     *
  51  *===========================================================================*/
  52 int fs_flush()
  53 {
  54 /* Flush the blocks of a device from the cache after writing any dirty blocks
  55  * to disk.
  56  */
  57   dev_t dev = (dev_t) fs_m_in.REQ_DEV;
  58
  59   if(dev == fs_dev) return(EBUSY);
  60
  61   flushall(dev);
  62   invalidate(dev);
  63
  64   return(OK);
  65 }
  66
  67 /*===========================================================================*
  68  *                              fs_new_driver                                *
  69  *===========================================================================*/
  70 int fs_new_driver(void)
  71 {
  72 /* Set a new driver endpoint for this device. */
  73   dev_t dev;
  74   cp_grant_id_t label_gid;
  75   size_t label_len;
  76   char label[sizeof(fs_dev_label)];
  77   int r;
  78
  79   dev = (dev_t) fs_m_in.REQ_DEV;
  80   label_gid = (cp_grant_id_t) fs_m_in.REQ_GRANT;
  81   label_len = (size_t) fs_m_in.REQ_PATH_LEN;
  82
  83   if (label_len > sizeof(label))
  84         return(EINVAL);
  85
  86   r = sys_safecopyfrom(fs_m_in.m_source, label_gid, (vir_bytes) 0,
  87         (vir_bytes) label, label_len);
  88
  89   if (r != OK) {
  90         printf("ext2: fs_new_driver safecopyfrom failed (%d)\n", r);
  91         return(EINVAL);
  92   }
  93
  94   bdev_driver(dev, label);
  95
  96   return(OK);
  97 }