/*
* 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
}
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;
}
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;
}
