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- Write serial numbers to the device (FAT)

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- DRIVE_ReadSuperblock: better checking for the FAT fs.
This commit is contained in:
Petr Tomasek 2000-02-27 14:00:14 +00:00 committed by Alexandre Julliard
parent 59b5f786ff
commit cd9a633ffa
1 changed files with 63 additions and 7 deletions
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70
files/drive.c
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@ -423,7 +423,9 @@ const char * DRIVE_GetDevice( int drive )
/***********************************************************************
* DRIVE_ReadSuperblock
*
* Used in DRIVE_GetLabel
* NOTE
* DRIVE_SetLabel and DRIVE_SetSerialNumber use this in order
* to check, that they are writing on a FAT filesystem !
*/
int DRIVE_ReadSuperblock (int drive, char * buff)
{
@ -469,9 +471,16 @@ int DRIVE_ReadSuperblock (int drive, char * buff)
{
case TYPE_FLOPPY:
case TYPE_HD:
if (buff[0x26]!=0x29) /* Check for FAT present */
return -3;
break;
if ((buff[0x26]!=0x29) || /* Check for FAT present */
/* FIXME: do really all Fat have their name beginning with
"FAT" ? (At least FAT12, FAT16 and FAT32 have :) */
memcmp( buff+0x36,"FAT",3))
{
ERR("The filesystem is not FAT !! (device=%s)\n",
DOSDrives[drive].device);
return -3;
}
break;
case TYPE_CDROM:
if (strncmp(&buff[1],"CD001",5)) /* Check for iso9660 present */
return -3;
@ -486,6 +495,42 @@ int DRIVE_ReadSuperblock (int drive, char * buff)
}
/***********************************************************************
* DRIVE_WriteSuperblockEntry
*
* NOTE
* We are writing as little as possible (ie. not the whole SuperBlock)
* not to interfere with kernel. The drive can be mounted !
*/
int DRIVE_WriteSuperblockEntry (int drive, off_t ofs, size_t len, char * buff)
{
int fd;
if ((fd=open(DOSDrives[drive].device,O_WRONLY))==-1)
{
ERR("Cannot open the device %s (for writing)\n",
DOSDrives[drive].device);
return -1;
}
if (lseek(fd,ofs,SEEK_SET)!=ofs)
{
ERR("lseek failed on device %s !\n",
DOSDrives[drive].device);
close(fd);
return -2;
}
if (write(fd,buff,len)!=len)
{
close(fd);
ERR("Cannot write on %s !\n",
DOSDrives[drive].device);
return -3;
}
return close (fd);
}
/***********************************************************************
* DRIVE_GetLabel
*/
@ -584,10 +629,21 @@ char buff[DRIVE_SUPER];
*/
int DRIVE_SetSerialNumber( int drive, DWORD serial )
{
char buff[DRIVE_SUPER];
if (!DRIVE_IsValid( drive )) return 0;
if ((DOSDrives[drive].read_volinfo) &&
(DOSDrives[drive].type != TYPE_CDROM))
FIXME("Setting the serial number is useless for drive %c: until writing it is properly implemented, as this drive reads it from the device.\n", 'A'+drive);
if (DOSDrives[drive].read_volinfo)
{
if ((DOSDrives[drive].type != TYPE_FLOPPY) &&
(DOSDrives[drive].type != TYPE_HD)) return 0;
/* check, if the drive has a FAT filesystem */
if (DRIVE_ReadSuperblock(drive, buff)) return 0;
if (DRIVE_WriteSuperblockEntry(drive, 0x27, 4, (char *) &serial)) return 0;
return 1;
}
if (DOSDrives[drive].type == TYPE_CDROM) return 0;
DOSDrives[drive].serial_conf = serial;
return 1;
}