Exemplo n.º 1
0
/*
 * This interface is depreciated - users should use the scsi generics
 * interface instead, as this is a more flexible approach to performing
 * generic SCSI commands on a device.
 */
int scsi_ioctl_send_command(Scsi_Device *dev, Scsi_Ioctl_Command *sic)
{
    unsigned long flags;
    char * buf;
    unsigned char cmd[12]; 
    char * cmd_in;
    Scsi_Cmnd * SCpnt;
    Scsi_Device * SDpnt;
    unsigned char opcode;
    int inlen, outlen, cmdlen;
    int needed, buf_needed;
    int timeout, retries, result;
    
    if (!sic)
	return -EINVAL;
    

    /*
     * Verify that we can read at least this much.
     */
    result = verify_area(VERIFY_READ, sic, sizeof (Scsi_Ioctl_Command));
    if (result) return result;

    /*
     * The structure that we are passed should look like:
     *
     * struct sdata {
     *	unsigned int inlen;
     *	unsigned int outlen;
     *	unsigned char  cmd[];  # However many bytes are used for cmd.
     *	unsigned char  data[];
     * };
     */
    get_user(inlen, &sic->inlen);
    get_user(outlen, &sic->outlen);
    
    /*
     * We do not transfer more than MAX_BUF with this interface.
     * If the user needs to transfer more data than this, they
     * should use scsi_generics instead.
     */
    if( inlen > MAX_BUF ) return -EINVAL;
    if( outlen > MAX_BUF ) return -EINVAL;

    cmd_in = sic->data;
    get_user(opcode, cmd_in); 
    
    needed = buf_needed = (inlen > outlen ? inlen : outlen);
    if(buf_needed){
	buf_needed = (buf_needed + 511) & ~511;
	if (buf_needed > MAX_BUF) buf_needed = MAX_BUF;
        spin_lock_irqsave(&io_request_lock, flags);
	buf = (char *) scsi_malloc(buf_needed);
        spin_unlock_irqrestore(&io_request_lock, flags);
	if (!buf) return -ENOMEM;
	memset(buf, 0, buf_needed);
    } else
	buf = NULL;
    
    /*
     * Obtain the command from the user's address space.
     */
    cmdlen = COMMAND_SIZE(opcode);

    result = verify_area(VERIFY_READ, cmd_in, 
                         cmdlen + inlen > MAX_BUF ? MAX_BUF : cmdlen + inlen);
    if (result) return result;

    copy_from_user ((void *) cmd,  cmd_in,  cmdlen);
    
    /*
     * Obtain the data to be sent to the device (if any).
     */
    copy_from_user ((void *) buf,  
                   (void *) (cmd_in + cmdlen), 
                   inlen);
    
    /*
     * Set the lun field to the correct value.
     */
    cmd[1] = ( cmd[1] & 0x1f ) | (dev->lun << 5);
    
    switch (opcode)
      {
      case FORMAT_UNIT:
 	timeout = FORMAT_UNIT_TIMEOUT;
	retries = 1;
	break;
      case START_STOP:
 	timeout = START_STOP_TIMEOUT;
 	retries = NORMAL_RETRIES;
	break;
      case MOVE_MEDIUM:
 	timeout = MOVE_MEDIUM_TIMEOUT;
 	retries = NORMAL_RETRIES;
 	break;
      case READ_ELEMENT_STATUS:
 	timeout = READ_ELEMENT_STATUS_TIMEOUT;
 	retries = NORMAL_RETRIES;
	break;
      default:
 	timeout = NORMAL_TIMEOUT;
 	retries = NORMAL_RETRIES;
	break;
      }

#ifndef DEBUG_NO_CMD

    spin_lock_irqsave(&io_request_lock, flags);
    
    SCpnt = scsi_allocate_device(NULL, dev, 1);

    {
	struct semaphore sem = MUTEX_LOCKED;
	SCpnt->request.sem = &sem;
	scsi_do_cmd(SCpnt,  cmd,  buf, needed,  scsi_ioctl_done,
		    timeout, retries);
	spin_unlock_irqrestore(&io_request_lock, flags);
	down(&sem);
        SCpnt->request.sem = NULL;
    }
    
    /* 
     * If there was an error condition, pass the info back to the user. 
     */
    if(SCpnt->result) {
        result = verify_area(VERIFY_WRITE, 
                             cmd_in, 
                             sizeof(SCpnt->sense_buffer));
        if (result) return result;
        copy_to_user((void *) cmd_in,  
                    SCpnt->sense_buffer, 
                    sizeof(SCpnt->sense_buffer));
    } else {
        result = verify_area(VERIFY_WRITE, cmd_in, outlen);
        if (result) return result;
        copy_to_user ((void *) cmd_in,  buf,  outlen);
    }
    result = SCpnt->result;

    spin_lock_irqsave(&io_request_lock, flags);

    wake_up(&SCpnt->device->device_wait);
    SDpnt = SCpnt->device;
    scsi_release_command(SCpnt);
    SCpnt = NULL;

    if (buf) scsi_free(buf, buf_needed);
    
    if(SDpnt->scsi_request_fn)
	(*SDpnt->scsi_request_fn)();
    
    spin_unlock_irqrestore(&io_request_lock, flags);
    return result;
#else
    {
	int i;
	printk("scsi_ioctl : device %d.  command = ", dev->id);
	for (i = 0; i < 12; ++i)
	    printk("%02x ", cmd[i]);
	printk("\nbuffer =");
	for (i = 0; i < 20; ++i)
	    printk("%02x ", buf[i]);
	printk("\n");
	printk("inlen = %d, outlen = %d, cmdlen = %d\n",
	       inlen, outlen, cmdlen);
	printk("buffer = %d, cmd_in = %d\n", buffer, cmd_in);
    }
    return 0;
#endif
}
Exemplo n.º 2
0
static ssize_t sg_write(struct file *filp, const char *buf,
                        size_t count, loff_t *ppos)
{
    unsigned long	  flags;
    struct inode         *inode = filp->f_dentry->d_inode;
    int			  bsize,size,amt,i;
    unsigned char	  cmnd[MAX_COMMAND_SIZE];
    kdev_t		  devt = inode->i_rdev;
    int			  dev = MINOR(devt);
    struct scsi_generic   * device=&scsi_generics[dev];
    int			  input_size;
    unsigned char	  opcode;
    Scsi_Cmnd		* SCpnt;

    /*
     * If we are in the middle of error recovery, don't let anyone
     * else try and use this device.  Also, if error recovery fails, it
     * may try and take the device offline, in which case all further
     * access to the device is prohibited.
     */
    if( !scsi_block_when_processing_errors(scsi_generics[dev].device) )
    {
        return -ENXIO;
    }

    if (ppos != &filp->f_pos) {
        /* FIXME: Hmm.  Seek to the right place, or fail?  */
    }

    if ((i=verify_area(VERIFY_READ,buf,count)))
        return i;
    /*
     * The minimum scsi command length is 6 bytes.  If we get anything
     * less than this, it is clearly bogus.
     */
    if (count<(sizeof(struct sg_header) + 6))
        return -EIO;

    /*
     * If we still have a result pending from a previous command,
     * wait until the result has been read by the user before sending
     * another command.
     */
    while(device->pending)
    {
        if (filp->f_flags & O_NONBLOCK)
            return -EAGAIN;
#ifdef DEBUG
        printk("sg_write: sleeping on pending request\n");
#endif
        interruptible_sleep_on(&device->write_wait);
        if (signal_pending(current))
            return -ERESTARTSYS;
    }

    /*
     * Mark the device flags for the new state.
     */
    device->pending=1;
    device->complete=0;
    copy_from_user(&device->header,buf,sizeof(struct sg_header));

    device->header.pack_len=count;
    buf+=sizeof(struct sg_header);

    /*
     * Now we need to grab the command itself from the user's buffer.
     */
    get_user(opcode, buf);
    size=COMMAND_SIZE(opcode);
    if (opcode >= 0xc0 && device->header.twelve_byte) size = 12;

    /*
     * Determine buffer size.
     */
    input_size = device->header.pack_len - size;
    if( input_size > device->header.reply_len)
    {
        bsize = input_size;
    } else {
        bsize = device->header.reply_len;
    }

    /*
     * Don't include the command header itself in the size.
     */
    bsize-=sizeof(struct sg_header);
    input_size-=sizeof(struct sg_header);

    /*
     * Verify that the user has actually passed enough bytes for this command.
     */
    if( input_size < 0 )
    {
        device->pending=0;
        wake_up( &device->write_wait );
        return -EIO;
    }

    /*
     * Allocate a buffer that is large enough to hold the data
     * that has been requested.  Round up to an even number of sectors,
     * since scsi_malloc allocates in chunks of 512 bytes.
     */
    amt=bsize;
    if (!bsize)
        bsize++;
    bsize=(bsize+511) & ~511;

    /*
     * If we cannot allocate the buffer, report an error.
     */
    if ((bsize<0) || !(device->buff=sg_malloc(device->buff_len=bsize)))
    {
        device->pending=0;
        wake_up(&device->write_wait);
        return -ENOMEM;
    }

#ifdef DEBUG
    printk("allocating device\n");
#endif

    /*
     * Grab a device pointer for the device we want to talk to.  If we
     * don't want to block, just return with the appropriate message.
     */
    if (!(SCpnt=scsi_allocate_device(NULL,device->device, !(filp->f_flags & O_NONBLOCK))))
    {
        device->pending=0;
        wake_up(&device->write_wait);
        sg_free(device->buff,device->buff_len);
        device->buff = NULL;
        return -EAGAIN;
    }
#ifdef DEBUG
    printk("device allocated\n");
#endif

    SCpnt->request.rq_dev = devt;
    SCpnt->request.rq_status = RQ_ACTIVE;
    SCpnt->sense_buffer[0]=0;
    SCpnt->cmd_len = size;

    /*
     * Now copy the SCSI command from the user's address space.
     */
    copy_from_user(cmnd,buf,size);
    buf+=size;

    /*
     * If we are writing data, copy the data we are writing.  The pack_len
     * field also includes the length of the header and the command,
     * so we need to subtract these off.
     */
    if (input_size > 0) copy_from_user(device->buff, buf, input_size);

    /*
     * Set the LUN field in the command structure.
     */
    cmnd[1]= (cmnd[1] & 0x1f) | (device->device->lun<<5);

#ifdef DEBUG
    printk("do cmd\n");
#endif

    /*
     * Now pass the actual command down to the low-level driver.  We
     * do not do any more here - when the interrupt arrives, we will
     * then do the post-processing.
     */
    spin_lock_irqsave(&io_request_lock, flags);
    scsi_do_cmd (SCpnt,(void *) cmnd,
                 (void *) device->buff,amt,
                 sg_command_done,device->timeout,SG_DEFAULT_RETRIES);
    spin_unlock_irqrestore(&io_request_lock, flags);

#ifdef DEBUG
    printk("done cmd\n");
#endif

    return count;
}
Exemplo n.º 3
0
static int ioctl_internal_command(Scsi_Device *dev, char * cmd,
				  int timeout, int retries)
{
    unsigned long flags;
    int result;
    Scsi_Cmnd * SCpnt;
    Scsi_Device * SDpnt;

    spin_lock_irqsave(&io_request_lock, flags);

    SCSI_LOG_IOCTL(1, printk("Trying ioctl with scsi command %d\n", cmd[0]));
    SCpnt = scsi_allocate_device(NULL, dev, 1);
    {
	struct semaphore sem = MUTEX_LOCKED;
	SCpnt->request.sem = &sem;
	scsi_do_cmd(SCpnt,  cmd, NULL,  0, scsi_ioctl_done,  timeout, retries);
	spin_unlock_irqrestore(&io_request_lock, flags);
	down(&sem);
        spin_lock_irqsave(&io_request_lock, flags);
        SCpnt->request.sem = NULL;
    }
    
    SCSI_LOG_IOCTL(2, printk("Ioctl returned  0x%x\n", SCpnt->result));

    if(driver_byte(SCpnt->result) != 0)
	switch(SCpnt->sense_buffer[2] & 0xf) {
	case ILLEGAL_REQUEST:
	    if(cmd[0] == ALLOW_MEDIUM_REMOVAL) dev->lockable = 0;
	    else printk("SCSI device (ioctl) reports ILLEGAL REQUEST.\n");
	    break;
	case NOT_READY: /* This happens if there is no disc in drive */
	    if(dev->removable && (cmd[0] != TEST_UNIT_READY)){
		printk(KERN_INFO "Device not ready.  Make sure there is a disc in the drive.\n");
		break;
	    }
	case UNIT_ATTENTION:
	    if (dev->removable){
		dev->changed = 1;
		SCpnt->result = 0; /* This is no longer considered an error */
		/* gag this error, VFS will log it anyway /axboe */
		/* printk(KERN_INFO "Disc change detected.\n"); */
		break;
	    };
	default: /* Fall through for non-removable media */
	    printk("SCSI error: host %d id %d lun %d return code = %x\n",
		   dev->host->host_no,
		   dev->id,
		   dev->lun,
		   SCpnt->result);
	    printk("\tSense class %x, sense error %x, extended sense %x\n",
		   sense_class(SCpnt->sense_buffer[0]),
		   sense_error(SCpnt->sense_buffer[0]),
		   SCpnt->sense_buffer[2] & 0xf);
	    
	};
    
    result = SCpnt->result;

    SCSI_LOG_IOCTL(2, printk("IOCTL Releasing command\n"));
    SDpnt = SCpnt->device;
    scsi_release_command(SCpnt);
    SCpnt = NULL;

    if (!SDpnt->was_reset && SDpnt->scsi_request_fn)
	(*SDpnt->scsi_request_fn)();

    wake_up(&SDpnt->device_wait);
    spin_unlock_irqrestore(&io_request_lock, flags);
    return result;
}