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linux/drivers/scsi/scsi_ioctl.c

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/*
* Changes:
* Arnaldo Carvalho de Melo <acme@conectiva.com.br> 08/23/2000
* - get rid of some verify_areas and use __copy*user and __get/put_user
* for the ones that remain
*/
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <asm/uaccess.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/scsi_request.h>
#include <scsi/sg.h>
#include <scsi/scsi_dbg.h>
#include "scsi_logging.h"
#define NORMAL_RETRIES 5
#define IOCTL_NORMAL_TIMEOUT (10 * HZ)
#define MAX_BUF PAGE_SIZE
/**
* ioctl_probe -- return host identification
* @host: host to identify
* @buffer: userspace buffer for identification
*
* Return an identifying string at @buffer, if @buffer is non-NULL, filling
* to the length stored at * (int *) @buffer.
*/
static int ioctl_probe(struct Scsi_Host *host, void __user *buffer)
{
unsigned int len, slen;
const char *string;
if (buffer) {
if (get_user(len, (unsigned int __user *) buffer))
return -EFAULT;
if (host->hostt->info)
string = host->hostt->info(host);
else
string = host->hostt->name;
if (string) {
slen = strlen(string);
if (len > slen)
len = slen + 1;
if (copy_to_user(buffer, string, len))
return -EFAULT;
}
}
return 1;
}
/*
* The SCSI_IOCTL_SEND_COMMAND ioctl sends a command out to the SCSI host.
* The IOCTL_NORMAL_TIMEOUT and NORMAL_RETRIES variables are used.
*
* dev is the SCSI device struct ptr, *(int *) arg is the length of the
* input data, if any, not including the command string & counts,
* *((int *)arg + 1) is the output buffer size in bytes.
*
* *(char *) ((int *) arg)[2] the actual command byte.
*
* Note that if more than MAX_BUF bytes are requested to be transferred,
* the ioctl will fail with error EINVAL.
*
* This size *does not* include the initial lengths that were passed.
*
* The SCSI command is read from the memory location immediately after the
* length words, and the input data is right after the command. The SCSI
* routines know the command size based on the opcode decode.
*
* The output area is then filled in starting from the command byte.
*/
static int ioctl_internal_command(struct scsi_device *sdev, char *cmd,
int timeout, int retries)
{
int result;
struct scsi_sense_hdr sshdr;
SCSI_LOG_IOCTL(1, printk("Trying ioctl with scsi command %d\n", *cmd));
result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0,
&sshdr, timeout, retries);
SCSI_LOG_IOCTL(2, printk("Ioctl returned 0x%x\n", result));
if ((driver_byte(result) & DRIVER_SENSE) &&
(scsi_sense_valid(&sshdr))) {
switch (sshdr.sense_key) {
case ILLEGAL_REQUEST:
if (cmd[0] == ALLOW_MEDIUM_REMOVAL)
sdev->lockable = 0;
else
printk(KERN_INFO "ioctl_internal_command: "
"ILLEGAL REQUEST asc=0x%x ascq=0x%x\n",
sshdr.asc, sshdr.ascq);
break;
case NOT_READY: /* This happens if there is no disc in drive */
if (sdev->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 (sdev->removable) {
sdev->changed = 1;
result = 0; /* This is no longer considered an error */
break;
}
default: /* Fall through for non-removable media */
printk(KERN_INFO "ioctl_internal_command: <%d %d %d "
"%d> return code = %x\n",
sdev->host->host_no,
sdev->channel,
sdev->id,
sdev->lun,
result);
scsi_print_sense_hdr(" ", &sshdr);
break;
}
}
SCSI_LOG_IOCTL(2, printk("IOCTL Releasing command\n"));
return result;
}
int scsi_set_medium_removal(struct scsi_device *sdev, char state)
{
char scsi_cmd[MAX_COMMAND_SIZE];
int ret;
if (!sdev->removable || !sdev->lockable)
return 0;
scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL;
scsi_cmd[1] = 0;
scsi_cmd[2] = 0;
scsi_cmd[3] = 0;
scsi_cmd[4] = state;
scsi_cmd[5] = 0;
ret = ioctl_internal_command(sdev, scsi_cmd,
IOCTL_NORMAL_TIMEOUT, NORMAL_RETRIES);
if (ret == 0)
sdev->locked = (state == SCSI_REMOVAL_PREVENT);
return ret;
}
EXPORT_SYMBOL(scsi_set_medium_removal);
/*
* This interface is deprecated - users should use the scsi generic (sg)
* interface instead, as this is a more flexible approach to performing
* generic SCSI commands on a device.
*
* The structure that we are passed should look like:
*
* struct sdata {
* unsigned int inlen; [i] Length of data to be written to device
* unsigned int outlen; [i] Length of data to be read from device
* unsigned char cmd[x]; [i] SCSI command (6 <= x <= 12).
* [o] Data read from device starts here.
* [o] On error, sense buffer starts here.
* unsigned char wdata[y]; [i] Data written to device starts here.
* };
* Notes:
* - The SCSI command length is determined by examining the 1st byte
* of the given command. There is no way to override this.
* - Data transfers are limited to PAGE_SIZE (4K on i386, 8K on alpha).
* - The length (x + y) must be at least OMAX_SB_LEN bytes long to
* accommodate the sense buffer when an error occurs.
* The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
* old code will not be surprised.
* - If a Unix error occurs (e.g. ENOMEM) then the user will receive
* a negative return and the Unix error code in 'errno'.
* If the SCSI command succeeds then 0 is returned.
* Positive numbers returned are the compacted SCSI error codes (4
* bytes in one int) where the lowest byte is the SCSI status.
* See the drivers/scsi/scsi.h file for more information on this.
*
*/
#define OMAX_SB_LEN 16 /* Old sense buffer length */
int scsi_ioctl_send_command(struct scsi_device *sdev,
struct scsi_ioctl_command __user *sic)
{
char *buf;
unsigned char cmd[MAX_COMMAND_SIZE];
unsigned char sense[SCSI_SENSE_BUFFERSIZE];
char __user *cmd_in;
unsigned char opcode;
unsigned int inlen, outlen, cmdlen;
unsigned int needed, buf_needed;
int timeout, retries, result;
int data_direction, gfp_mask = GFP_KERNEL;
if (!sic)
return -EINVAL;
if (sdev->host->unchecked_isa_dma)
gfp_mask |= GFP_DMA;
/*
* Verify that we can read at least this much.
*/
if (!access_ok(VERIFY_READ, sic, sizeof(Scsi_Ioctl_Command)))
return -EFAULT;
if(__get_user(inlen, &sic->inlen))
return -EFAULT;
if(__get_user(outlen, &sic->outlen))
return -EFAULT;
/*
* 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 (sg) instead.
*/
if (inlen > MAX_BUF)
return -EINVAL;
if (outlen > MAX_BUF)
return -EINVAL;
cmd_in = sic->data;
if(get_user(opcode, cmd_in))
return -EFAULT;
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;
buf = kmalloc(buf_needed, gfp_mask);
if (!buf)
return -ENOMEM;
memset(buf, 0, buf_needed);
if (inlen == 0) {
data_direction = DMA_FROM_DEVICE;
} else if (outlen == 0 ) {
data_direction = DMA_TO_DEVICE;
} else {
/*
* Can this ever happen?
*/
data_direction = DMA_BIDIRECTIONAL;
}
} else {
buf = NULL;
data_direction = DMA_NONE;
}
/*
* Obtain the command from the user's address space.
*/
cmdlen = COMMAND_SIZE(opcode);
result = -EFAULT;
if (!access_ok(VERIFY_READ, cmd_in, cmdlen + inlen))
goto error;
if(__copy_from_user(cmd, cmd_in, cmdlen))
goto error;
/*
* Obtain the data to be sent to the device (if any).
*/
if(copy_from_user(buf, cmd_in + cmdlen, inlen))
goto error;
switch (opcode) {
case SEND_DIAGNOSTIC:
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;
case READ_DEFECT_DATA:
timeout = READ_DEFECT_DATA_TIMEOUT;
retries = 1;
break;
default:
timeout = IOCTL_NORMAL_TIMEOUT;
retries = NORMAL_RETRIES;
break;
}
result = scsi_execute(sdev, cmd, data_direction, buf, needed,
sense, timeout, retries, 0);
/*
* If there was an error condition, pass the info back to the user.
*/
if (result) {
int sb_len = sizeof(*sense);
sb_len = (sb_len > OMAX_SB_LEN) ? OMAX_SB_LEN : sb_len;
if (copy_to_user(cmd_in, sense, sb_len))
result = -EFAULT;
} else {
if (copy_to_user(cmd_in, buf, outlen))
result = -EFAULT;
}
error:
kfree(buf);
return result;
}
EXPORT_SYMBOL(scsi_ioctl_send_command);
/*
* The scsi_ioctl_get_pci() function places into arg the value
* pci_dev::slot_name (8 characters) for the PCI device (if any).
* Returns: 0 on success
* -ENXIO if there isn't a PCI device pointer
* (could be because the SCSI driver hasn't been
* updated yet, or because it isn't a SCSI
* device)
* any copy_to_user() error on failure there
*/
static int scsi_ioctl_get_pci(struct scsi_device *sdev, void __user *arg)
{
struct device *dev = scsi_get_device(sdev->host);
if (!dev)
return -ENXIO;
return copy_to_user(arg, dev->bus_id, sizeof(dev->bus_id))? -EFAULT: 0;
}
/*
* the scsi_ioctl() function differs from most ioctls in that it does
* not take a major/minor number as the dev field. Rather, it takes
* a pointer to a scsi_devices[] element, a structure.
*/
int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
{
char scsi_cmd[MAX_COMMAND_SIZE];
/* No idea how this happens.... */
if (!sdev)
return -ENXIO;
/*
* 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(sdev))
return -ENODEV;
/* Check for deprecated ioctls ... all the ioctls which don't
* follow the new unique numbering scheme are deprecated */
switch (cmd) {
case SCSI_IOCTL_SEND_COMMAND:
case SCSI_IOCTL_TEST_UNIT_READY:
case SCSI_IOCTL_BENCHMARK_COMMAND:
case SCSI_IOCTL_SYNC:
case SCSI_IOCTL_START_UNIT:
case SCSI_IOCTL_STOP_UNIT:
printk(KERN_WARNING "program %s is using a deprecated SCSI "
"ioctl, please convert it to SG_IO\n", current->comm);
break;
default:
break;
}
switch (cmd) {
case SCSI_IOCTL_GET_IDLUN:
if (!access_ok(VERIFY_WRITE, arg, sizeof(struct scsi_idlun)))
return -EFAULT;
__put_user((sdev->id & 0xff)
+ ((sdev->lun & 0xff) << 8)
+ ((sdev->channel & 0xff) << 16)
+ ((sdev->host->host_no & 0xff) << 24),
&((struct scsi_idlun __user *)arg)->dev_id);
__put_user(sdev->host->unique_id,
&((struct scsi_idlun __user *)arg)->host_unique_id);
return 0;
case SCSI_IOCTL_GET_BUS_NUMBER:
return put_user(sdev->host->host_no, (int __user *)arg);
case SCSI_IOCTL_PROBE_HOST:
return ioctl_probe(sdev->host, arg);
case SCSI_IOCTL_SEND_COMMAND:
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
return scsi_ioctl_send_command(sdev, arg);
case SCSI_IOCTL_DOORLOCK:
return scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
case SCSI_IOCTL_DOORUNLOCK:
return scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
case SCSI_IOCTL_TEST_UNIT_READY:
return scsi_test_unit_ready(sdev, IOCTL_NORMAL_TIMEOUT,
NORMAL_RETRIES);
case SCSI_IOCTL_START_UNIT:
scsi_cmd[0] = START_STOP;
scsi_cmd[1] = 0;
scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
scsi_cmd[4] = 1;
return ioctl_internal_command(sdev, scsi_cmd,
START_STOP_TIMEOUT, NORMAL_RETRIES);
case SCSI_IOCTL_STOP_UNIT:
scsi_cmd[0] = START_STOP;
scsi_cmd[1] = 0;
scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
scsi_cmd[4] = 0;
return ioctl_internal_command(sdev, scsi_cmd,
START_STOP_TIMEOUT, NORMAL_RETRIES);
case SCSI_IOCTL_GET_PCI:
return scsi_ioctl_get_pci(sdev, arg);
default:
if (sdev->host->hostt->ioctl)
return sdev->host->hostt->ioctl(sdev, cmd, arg);
}
return -EINVAL;
}
EXPORT_SYMBOL(scsi_ioctl);
/*
* the scsi_nonblock_ioctl() function is designed for ioctls which may
* be executed even if the device is in recovery.
*/
int scsi_nonblockable_ioctl(struct scsi_device *sdev, int cmd,
void __user *arg, struct file *filp)
{
int val, result;
/* The first set of iocts may be executed even if we're doing
* error processing, as long as the device was opened
* non-blocking */
if (filp && filp->f_flags & O_NONBLOCK) {
if (sdev->host->shost_state == SHOST_RECOVERY)
return -ENODEV;
} else if (!scsi_block_when_processing_errors(sdev))
return -ENODEV;
switch (cmd) {
case SG_SCSI_RESET:
result = get_user(val, (int __user *)arg);
if (result)
return result;
if (val == SG_SCSI_RESET_NOTHING)
return 0;
switch (val) {
case SG_SCSI_RESET_DEVICE:
val = SCSI_TRY_RESET_DEVICE;
break;
case SG_SCSI_RESET_BUS:
val = SCSI_TRY_RESET_BUS;
break;
case SG_SCSI_RESET_HOST:
val = SCSI_TRY_RESET_HOST;
break;
default:
return -EINVAL;
}
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
return (scsi_reset_provider(sdev, val) ==
SUCCESS) ? 0 : -EIO;
}
return -ENODEV;
}
EXPORT_SYMBOL(scsi_nonblockable_ioctl);
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