/*
* This routine checks whether a floppy has been changed, and
* invalidates all buffer-cache-entries in that case. This
* is a relatively slow routine, so we have to try to minimize using
* it. Thus it is called only upon a 'mount' or 'open'. This
* is the best way of combining speed and utility, I think.
* People changing diskettes in the middle of an operation deserve
* to loose :-)
*
* NOTE! Although currently this is only for floppies, the idea is
* that any additional removable block-device will use this routine,
* and that mount/open needn't know that floppies/whatever are
* special.
*/
void check_disk_change(int dev)
{
int i;
struct buffer_head * bh;
switch(MAJOR(dev)){
case 2: /* floppy disc */
if (!(bh = getblk(dev,0,1024)))
return;
i = floppy_change(bh);
brelse(bh);
break;
#if defined(CONFIG_BLK_DEV_SR) && defined(CONFIG_SCSI)
case 11: /* CDROM */
i = check_cdrom_media_change(dev, 0);
if (i) printk("Flushing buffers and inodes for CDROM\n");
break;
#endif
default:
return;
};
if (!i) return;
for (i=0 ; i<NR_SUPER ; i++)
if (super_block[i].s_dev == dev)
put_super(super_block[i].s_dev);
invalidate_inodes(dev);
invalidate_buffers(dev);
}
/*
* This routine checks whether a floppy has been changed, and
* invalidates all buffer-cache-entries in that case. This
* is a relatively slow routine, so we have to try to minimize using
* it. Thus it is called only upon a 'mount' or 'open'. This
* is the best way of combining speed and utility, I think.
* People changing diskettes in the middle of an operation deserve
* to loose :-)
*
* NOTE! Although currently this is only for floppies, the idea is
* that any additional removable block-device will use this routine,
* and that mount/open needn't know that floppies/whatever are
* special.
*/
void check_disk_change(dev_t dev)
{
int i;
struct buffer_head * bh;
switch(MAJOR(dev)){
case FLOPPY_MAJOR:
if (!(bh = getblk(dev,0,1024)))
return;
i = floppy_change(bh);
brelse(bh);
break;
#if defined(CONFIG_BLK_DEV_SD) && defined(CONFIG_SCSI)
case SCSI_DISK_MAJOR:
i = check_scsidisk_media_change(dev, 0);
break;
#endif
#if defined(CONFIG_BLK_DEV_SR) && defined(CONFIG_SCSI)
case SCSI_CDROM_MAJOR:
i = check_cdrom_media_change(dev, 0);
break;
#endif
#if defined(CONFIG_CDU31A)
case CDU31A_CDROM_MAJOR:
i = check_cdu31a_media_change(dev, 0);
break;
#endif
#if defined(CONFIG_MCD)
case MITSUMI_CDROM_MAJOR:
i = check_mcd_media_change(dev, 0);
break;
#endif
default:
return;
};
if (!i) return;
printk("VFS: Disk change detected on device %d/%d\n",
MAJOR(dev), MINOR(dev));
for (i=0 ; i<NR_SUPER ; i++)
if (super_blocks[i].s_dev == dev)
put_super(super_blocks[i].s_dev);
invalidate_inodes(dev);
invalidate_buffers(dev);
#if defined(CONFIG_BLK_DEV_SD) && defined(CONFIG_SCSI)
/* This is trickier for a removable hardisk, because we have to invalidate
all of the partitions that lie on the disk. */
if (MAJOR(dev) == SCSI_DISK_MAJOR)
revalidate_scsidisk(dev, 0);
#endif
}
