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acrn-kernel/drivers/scsi/scsi_ioctl.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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 <linux/uaccess.h>
#include <linux/cdrom.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.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;
}
static int ioctl_internal_command(struct scsi_device *sdev, char *cmd,
int timeout, int retries)
{
int result;
struct scsi_sense_hdr sshdr;
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
};
SCSI_LOG_IOCTL(1, sdev_printk(KERN_INFO, sdev,
"Trying ioctl with scsi command %d\n", *cmd));
result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, NULL, 0, timeout,
retries, &exec_args);
SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev,
"Ioctl returned 0x%x\n", result));
if (result < 0)
goto out;
if (scsi_sense_valid(&sshdr)) {
switch (sshdr.sense_key) {
case ILLEGAL_REQUEST:
if (cmd[0] == ALLOW_MEDIUM_REMOVAL)
sdev->lockable = 0;
else
sdev_printk(KERN_INFO, sdev,
"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)
break;
fallthrough;
case UNIT_ATTENTION:
if (sdev->removable) {
sdev->changed = 1;
result = 0; /* This is no longer considered an error */
break;
}
fallthrough; /* for non-removable media */
default:
sdev_printk(KERN_INFO, sdev,
"ioctl_internal_command return code = %x\n",
result);
scsi_print_sense_hdr(sdev, NULL, &sshdr);
break;
}
}
out:
SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev,
"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);
/*
* 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);
const char *name;
if (!dev)
return -ENXIO;
name = dev_name(dev);
/* compatibility with old ioctl which only returned
* 20 characters */
return copy_to_user(arg, name, min(strlen(name), (size_t)20))
? -EFAULT: 0;
}
static int sg_get_version(int __user *p)
{
static const int sg_version_num = 30527;
return put_user(sg_version_num, p);
}
static int sg_set_timeout(struct scsi_device *sdev, int __user *p)
{
int timeout, err = get_user(timeout, p);
if (!err)
sdev->sg_timeout = clock_t_to_jiffies(timeout);
return err;
}
static int sg_get_reserved_size(struct scsi_device *sdev, int __user *p)
{
int val = min(sdev->sg_reserved_size,
queue_max_bytes(sdev->request_queue));
return put_user(val, p);
}
static int sg_set_reserved_size(struct scsi_device *sdev, int __user *p)
{
int size, err = get_user(size, p);
if (err)
return err;
if (size < 0)
return -EINVAL;
sdev->sg_reserved_size = min_t(unsigned int, size,
queue_max_bytes(sdev->request_queue));
return 0;
}
/*
* will always return that we are ATAPI even for a real SCSI drive, I'm not
* so sure this is worth doing anything about (why would you care??)
*/
static int sg_emulated_host(struct request_queue *q, int __user *p)
{
return put_user(1, p);
}
static int scsi_get_idlun(struct scsi_device *sdev, void __user *argp)
{
struct scsi_idlun v = {
.dev_id = (sdev->id & 0xff) +
((sdev->lun & 0xff) << 8) +
((sdev->channel & 0xff) << 16) +
((sdev->host->host_no & 0xff) << 24),
.host_unique_id = sdev->host->unique_id
};
if (copy_to_user(argp, &v, sizeof(struct scsi_idlun)))
return -EFAULT;
return 0;
}
static int scsi_send_start_stop(struct scsi_device *sdev, int data)
{
u8 cdb[MAX_COMMAND_SIZE] = { };
cdb[0] = START_STOP;
cdb[4] = data;
return ioctl_internal_command(sdev, cdb, START_STOP_TIMEOUT,
NORMAL_RETRIES);
}
/*
* Check if the given command is allowed.
*
* Only a subset of commands are allowed for unprivileged users. Commands used
* to format the media, update the firmware, etc. are not permitted.
*/
bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode)
{
/* root can do any command. */
if (capable(CAP_SYS_RAWIO))
return true;
/* Anybody who can open the device can do a read-safe command */
switch (cmd[0]) {
/* Basic read-only commands */
case TEST_UNIT_READY:
case REQUEST_SENSE:
case READ_6:
case READ_10:
case READ_12:
case READ_16:
case READ_BUFFER:
case READ_DEFECT_DATA:
case READ_CAPACITY: /* also GPCMD_READ_CDVD_CAPACITY */
case READ_LONG:
case INQUIRY:
case MODE_SENSE:
case MODE_SENSE_10:
case LOG_SENSE:
case START_STOP:
case GPCMD_VERIFY_10:
case VERIFY_16:
case REPORT_LUNS:
case SERVICE_ACTION_IN_16:
case RECEIVE_DIAGNOSTIC:
case MAINTENANCE_IN: /* also GPCMD_SEND_KEY, which is a write command */
case GPCMD_READ_BUFFER_CAPACITY:
/* Audio CD commands */
case GPCMD_PLAY_CD:
case GPCMD_PLAY_AUDIO_10:
case GPCMD_PLAY_AUDIO_MSF:
case GPCMD_PLAY_AUDIO_TI:
case GPCMD_PAUSE_RESUME:
/* CD/DVD data reading */
case GPCMD_READ_CD:
case GPCMD_READ_CD_MSF:
case GPCMD_READ_DISC_INFO:
case GPCMD_READ_DVD_STRUCTURE:
case GPCMD_READ_HEADER:
case GPCMD_READ_TRACK_RZONE_INFO:
case GPCMD_READ_SUBCHANNEL:
case GPCMD_READ_TOC_PMA_ATIP:
case GPCMD_REPORT_KEY:
case GPCMD_SCAN:
case GPCMD_GET_CONFIGURATION:
case GPCMD_READ_FORMAT_CAPACITIES:
case GPCMD_GET_EVENT_STATUS_NOTIFICATION:
case GPCMD_GET_PERFORMANCE:
case GPCMD_SEEK:
case GPCMD_STOP_PLAY_SCAN:
/* ZBC */
case ZBC_IN:
return true;
/* Basic writing commands */
case WRITE_6:
case WRITE_10:
case WRITE_VERIFY:
case WRITE_12:
case WRITE_VERIFY_12:
case WRITE_16:
case WRITE_LONG:
case WRITE_LONG_2:
case WRITE_SAME:
case WRITE_SAME_16:
case WRITE_SAME_32:
case ERASE:
case GPCMD_MODE_SELECT_10:
case MODE_SELECT:
case LOG_SELECT:
case GPCMD_BLANK:
case GPCMD_CLOSE_TRACK:
case GPCMD_FLUSH_CACHE:
case GPCMD_FORMAT_UNIT:
case GPCMD_REPAIR_RZONE_TRACK:
case GPCMD_RESERVE_RZONE_TRACK:
case GPCMD_SEND_DVD_STRUCTURE:
case GPCMD_SEND_EVENT:
case GPCMD_SEND_OPC:
case GPCMD_SEND_CUE_SHEET:
case GPCMD_SET_SPEED:
case GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
case GPCMD_LOAD_UNLOAD:
case GPCMD_SET_STREAMING:
case GPCMD_SET_READ_AHEAD:
/* ZBC */
case ZBC_OUT:
return (mode & FMODE_WRITE);
default:
return false;
}
}
EXPORT_SYMBOL(scsi_cmd_allowed);
static int scsi_fill_sghdr_rq(struct scsi_device *sdev, struct request *rq,
struct sg_io_hdr *hdr, fmode_t mode)
{
struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
if (hdr->cmd_len < 6)
return -EMSGSIZE;
if (copy_from_user(scmd->cmnd, hdr->cmdp, hdr->cmd_len))
return -EFAULT;
if (!scsi_cmd_allowed(scmd->cmnd, mode))
return -EPERM;
scmd->cmd_len = hdr->cmd_len;
rq->timeout = msecs_to_jiffies(hdr->timeout);
if (!rq->timeout)
rq->timeout = sdev->sg_timeout;
if (!rq->timeout)
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
if (rq->timeout < BLK_MIN_SG_TIMEOUT)
rq->timeout = BLK_MIN_SG_TIMEOUT;
return 0;
}
static int scsi_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
struct bio *bio)
{
struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
int r, ret = 0;
/*
* fill in all the output members
*/
hdr->status = scmd->result & 0xff;
hdr->masked_status = sg_status_byte(scmd->result);
hdr->msg_status = COMMAND_COMPLETE;
hdr->host_status = host_byte(scmd->result);
hdr->driver_status = 0;
if (scsi_status_is_check_condition(hdr->status))
hdr->driver_status = DRIVER_SENSE;
hdr->info = 0;
if (hdr->masked_status || hdr->host_status || hdr->driver_status)
hdr->info |= SG_INFO_CHECK;
hdr->resid = scmd->resid_len;
hdr->sb_len_wr = 0;
if (scmd->sense_len && hdr->sbp) {
int len = min((unsigned int) hdr->mx_sb_len, scmd->sense_len);
if (!copy_to_user(hdr->sbp, scmd->sense_buffer, len))
hdr->sb_len_wr = len;
else
ret = -EFAULT;
}
r = blk_rq_unmap_user(bio);
if (!ret)
ret = r;
return ret;
}
static int sg_io(struct scsi_device *sdev, struct sg_io_hdr *hdr, fmode_t mode)
{
unsigned long start_time;
ssize_t ret = 0;
int writing = 0;
int at_head = 0;
struct request *rq;
struct scsi_cmnd *scmd;
struct bio *bio;
if (hdr->interface_id != 'S')
return -EINVAL;
if (hdr->dxfer_len > (queue_max_hw_sectors(sdev->request_queue) << 9))
return -EIO;
if (hdr->dxfer_len)
switch (hdr->dxfer_direction) {
default:
return -EINVAL;
case SG_DXFER_TO_DEV:
writing = 1;
break;
case SG_DXFER_TO_FROM_DEV:
case SG_DXFER_FROM_DEV:
break;
}
if (hdr->flags & SG_FLAG_Q_AT_HEAD)
at_head = 1;
rq = scsi_alloc_request(sdev->request_queue, writing ?
REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
if (IS_ERR(rq))
return PTR_ERR(rq);
scmd = blk_mq_rq_to_pdu(rq);
if (hdr->cmd_len > sizeof(scmd->cmnd)) {
ret = -EINVAL;
goto out_put_request;
}
ret = scsi_fill_sghdr_rq(sdev, rq, hdr, mode);
if (ret < 0)
goto out_put_request;
ret = blk_rq_map_user_io(rq, NULL, hdr->dxferp, hdr->dxfer_len,
GFP_KERNEL, hdr->iovec_count && hdr->dxfer_len,
hdr->iovec_count, 0, rq_data_dir(rq));
if (ret)
goto out_put_request;
bio = rq->bio;
scmd->allowed = 0;
start_time = jiffies;
blk_execute_rq(rq, at_head);
hdr->duration = jiffies_to_msecs(jiffies - start_time);
ret = scsi_complete_sghdr_rq(rq, hdr, bio);
out_put_request:
blk_mq_free_request(rq);
return ret;
}
/**
* sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
* @q: request queue to send scsi commands down
* @mode: mode used to open the file through which the ioctl has been
* submitted
* @sic: userspace structure describing the command to perform
*
* Send down the scsi command described by @sic to the device below
* the request queue @q.
*
* Notes:
* - This interface is deprecated - users should use the SG_IO
* interface instead, as this is a more flexible approach to
* performing SCSI commands on a device.
* - 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
* - 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.
*/
static int sg_scsi_ioctl(struct request_queue *q, fmode_t mode,
struct scsi_ioctl_command __user *sic)
{
struct request *rq;
int err;
unsigned int in_len, out_len, bytes, opcode, cmdlen;
struct scsi_cmnd *scmd;
char *buffer = NULL;
if (!sic)
return -EINVAL;
/*
* get in an out lengths, verify they don't exceed a page worth of data
*/
if (get_user(in_len, &sic->inlen))
return -EFAULT;
if (get_user(out_len, &sic->outlen))
return -EFAULT;
if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
return -EINVAL;
if (get_user(opcode, &sic->data[0]))
return -EFAULT;
bytes = max(in_len, out_len);
if (bytes) {
buffer = kzalloc(bytes, GFP_NOIO | GFP_USER | __GFP_NOWARN);
if (!buffer)
return -ENOMEM;
}
rq = scsi_alloc_request(q, in_len ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
if (IS_ERR(rq)) {
err = PTR_ERR(rq);
goto error_free_buffer;
}
scmd = blk_mq_rq_to_pdu(rq);
cmdlen = COMMAND_SIZE(opcode);
/*
* get command and data to send to device, if any
*/
err = -EFAULT;
scmd->cmd_len = cmdlen;
if (copy_from_user(scmd->cmnd, sic->data, cmdlen))
goto error;
if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
goto error;
err = -EPERM;
if (!scsi_cmd_allowed(scmd->cmnd, mode))
goto error;
/* default. possible overridden later */
scmd->allowed = 5;
switch (opcode) {
case SEND_DIAGNOSTIC:
case FORMAT_UNIT:
rq->timeout = FORMAT_UNIT_TIMEOUT;
scmd->allowed = 1;
break;
case START_STOP:
rq->timeout = START_STOP_TIMEOUT;
break;
case MOVE_MEDIUM:
rq->timeout = MOVE_MEDIUM_TIMEOUT;
break;
case READ_ELEMENT_STATUS:
rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
break;
case READ_DEFECT_DATA:
rq->timeout = READ_DEFECT_DATA_TIMEOUT;
scmd->allowed = 1;
break;
default:
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
break;
}
if (bytes) {
err = blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO);
if (err)
goto error;
}
blk_execute_rq(rq, false);
err = scmd->result & 0xff; /* only 8 bit SCSI status */
if (err) {
if (scmd->sense_len && scmd->sense_buffer) {
/* limit sense len for backward compatibility */
if (copy_to_user(sic->data, scmd->sense_buffer,
min(scmd->sense_len, 16U)))
err = -EFAULT;
}
} else {
if (copy_to_user(sic->data, buffer, out_len))
err = -EFAULT;
}
error:
blk_mq_free_request(rq);
error_free_buffer:
kfree(buffer);
return err;
}
int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp)
{
#ifdef CONFIG_COMPAT
if (in_compat_syscall()) {
struct compat_sg_io_hdr hdr32 = {
.interface_id = hdr->interface_id,
.dxfer_direction = hdr->dxfer_direction,
.cmd_len = hdr->cmd_len,
.mx_sb_len = hdr->mx_sb_len,
.iovec_count = hdr->iovec_count,
.dxfer_len = hdr->dxfer_len,
.dxferp = (uintptr_t)hdr->dxferp,
.cmdp = (uintptr_t)hdr->cmdp,
.sbp = (uintptr_t)hdr->sbp,
.timeout = hdr->timeout,
.flags = hdr->flags,
.pack_id = hdr->pack_id,
.usr_ptr = (uintptr_t)hdr->usr_ptr,
.status = hdr->status,
.masked_status = hdr->masked_status,
.msg_status = hdr->msg_status,
.sb_len_wr = hdr->sb_len_wr,
.host_status = hdr->host_status,
.driver_status = hdr->driver_status,
.resid = hdr->resid,
.duration = hdr->duration,
.info = hdr->info,
};
if (copy_to_user(argp, &hdr32, sizeof(hdr32)))
return -EFAULT;
return 0;
}
#endif
if (copy_to_user(argp, hdr, sizeof(*hdr)))
return -EFAULT;
return 0;
}
EXPORT_SYMBOL(put_sg_io_hdr);
int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp)
{
#ifdef CONFIG_COMPAT
struct compat_sg_io_hdr hdr32;
if (in_compat_syscall()) {
if (copy_from_user(&hdr32, argp, sizeof(hdr32)))
return -EFAULT;
*hdr = (struct sg_io_hdr) {
.interface_id = hdr32.interface_id,
.dxfer_direction = hdr32.dxfer_direction,
.cmd_len = hdr32.cmd_len,
.mx_sb_len = hdr32.mx_sb_len,
.iovec_count = hdr32.iovec_count,
.dxfer_len = hdr32.dxfer_len,
.dxferp = compat_ptr(hdr32.dxferp),
.cmdp = compat_ptr(hdr32.cmdp),
.sbp = compat_ptr(hdr32.sbp),
.timeout = hdr32.timeout,
.flags = hdr32.flags,
.pack_id = hdr32.pack_id,
.usr_ptr = compat_ptr(hdr32.usr_ptr),
.status = hdr32.status,
.masked_status = hdr32.masked_status,
.msg_status = hdr32.msg_status,
.sb_len_wr = hdr32.sb_len_wr,
.host_status = hdr32.host_status,
.driver_status = hdr32.driver_status,
.resid = hdr32.resid,
.duration = hdr32.duration,
.info = hdr32.info,
};
return 0;
}
#endif
if (copy_from_user(hdr, argp, sizeof(*hdr)))
return -EFAULT;
return 0;
}
EXPORT_SYMBOL(get_sg_io_hdr);
#ifdef CONFIG_COMPAT
struct compat_cdrom_generic_command {
unsigned char cmd[CDROM_PACKET_SIZE];
compat_caddr_t buffer;
compat_uint_t buflen;
compat_int_t stat;
compat_caddr_t sense;
unsigned char data_direction;
unsigned char pad[3];
compat_int_t quiet;
compat_int_t timeout;
compat_caddr_t unused;
};
#endif
static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc,
const void __user *arg)
{
#ifdef CONFIG_COMPAT
if (in_compat_syscall()) {
struct compat_cdrom_generic_command cgc32;
if (copy_from_user(&cgc32, arg, sizeof(cgc32)))
return -EFAULT;
*cgc = (struct cdrom_generic_command) {
.buffer = compat_ptr(cgc32.buffer),
.buflen = cgc32.buflen,
.stat = cgc32.stat,
.sense = compat_ptr(cgc32.sense),
.data_direction = cgc32.data_direction,
.quiet = cgc32.quiet,
.timeout = cgc32.timeout,
.unused = compat_ptr(cgc32.unused),
};
memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE);
return 0;
}
#endif
if (copy_from_user(cgc, arg, sizeof(*cgc)))
return -EFAULT;
return 0;
}
static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc,
void __user *arg)
{
#ifdef CONFIG_COMPAT
if (in_compat_syscall()) {
struct compat_cdrom_generic_command cgc32 = {
.buffer = (uintptr_t)(cgc->buffer),
.buflen = cgc->buflen,
.stat = cgc->stat,
.sense = (uintptr_t)(cgc->sense),
.data_direction = cgc->data_direction,
.quiet = cgc->quiet,
.timeout = cgc->timeout,
.unused = (uintptr_t)(cgc->unused),
};
memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE);
if (copy_to_user(arg, &cgc32, sizeof(cgc32)))
return -EFAULT;
return 0;
}
#endif
if (copy_to_user(arg, cgc, sizeof(*cgc)))
return -EFAULT;
return 0;
}
static int scsi_cdrom_send_packet(struct scsi_device *sdev, fmode_t mode,
void __user *arg)
{
struct cdrom_generic_command cgc;
struct sg_io_hdr hdr;
int err;
err = scsi_get_cdrom_generic_arg(&cgc, arg);
if (err)
return err;
cgc.timeout = clock_t_to_jiffies(cgc.timeout);
memset(&hdr, 0, sizeof(hdr));
hdr.interface_id = 'S';
hdr.cmd_len = sizeof(cgc.cmd);
hdr.dxfer_len = cgc.buflen;
switch (cgc.data_direction) {
case CGC_DATA_UNKNOWN:
hdr.dxfer_direction = SG_DXFER_UNKNOWN;
break;
case CGC_DATA_WRITE:
hdr.dxfer_direction = SG_DXFER_TO_DEV;
break;
case CGC_DATA_READ:
hdr.dxfer_direction = SG_DXFER_FROM_DEV;
break;
case CGC_DATA_NONE:
hdr.dxfer_direction = SG_DXFER_NONE;
break;
default:
return -EINVAL;
}
hdr.dxferp = cgc.buffer;
hdr.sbp = cgc.sense;
if (hdr.sbp)
hdr.mx_sb_len = sizeof(struct request_sense);
hdr.timeout = jiffies_to_msecs(cgc.timeout);
hdr.cmdp = ((struct cdrom_generic_command __user *) arg)->cmd;
hdr.cmd_len = sizeof(cgc.cmd);
err = sg_io(sdev, &hdr, mode);
if (err == -EFAULT)
return -EFAULT;
if (hdr.status)
return -EIO;
cgc.stat = err;
cgc.buflen = hdr.resid;
if (scsi_put_cdrom_generic_arg(&cgc, arg))
return -EFAULT;
return err;
}
static int scsi_ioctl_sg_io(struct scsi_device *sdev, fmode_t mode,
void __user *argp)
{
struct sg_io_hdr hdr;
int error;
error = get_sg_io_hdr(&hdr, argp);
if (error)
return error;
error = sg_io(sdev, &hdr, mode);
if (error == -EFAULT)
return error;
if (put_sg_io_hdr(&hdr, argp))
return -EFAULT;
return error;
}
/**
* scsi_ioctl - Dispatch ioctl to scsi device
* @sdev: scsi device receiving ioctl
* @mode: mode the block/char device is opened with
* @cmd: which ioctl is it
* @arg: data associated with ioctl
*
* Description: 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 &struct scsi_device.
*/
int scsi_ioctl(struct scsi_device *sdev, fmode_t mode, int cmd,
void __user *arg)
{
struct request_queue *q = sdev->request_queue;
struct scsi_sense_hdr sense_hdr;
/* 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 SG_GET_VERSION_NUM:
return sg_get_version(arg);
case SG_SET_TIMEOUT:
return sg_set_timeout(sdev, arg);
case SG_GET_TIMEOUT:
return jiffies_to_clock_t(sdev->sg_timeout);
case SG_GET_RESERVED_SIZE:
return sg_get_reserved_size(sdev, arg);
case SG_SET_RESERVED_SIZE:
return sg_set_reserved_size(sdev, arg);
case SG_EMULATED_HOST:
return sg_emulated_host(q, arg);
case SG_IO:
return scsi_ioctl_sg_io(sdev, mode, arg);
case SCSI_IOCTL_SEND_COMMAND:
return sg_scsi_ioctl(q, mode, arg);
case CDROM_SEND_PACKET:
return scsi_cdrom_send_packet(sdev, mode, arg);
case CDROMCLOSETRAY:
return scsi_send_start_stop(sdev, 3);
case CDROMEJECT:
return scsi_send_start_stop(sdev, 2);
case SCSI_IOCTL_GET_IDLUN:
return scsi_get_idlun(sdev, arg);
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_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, &sense_hdr);
case SCSI_IOCTL_START_UNIT:
return scsi_send_start_stop(sdev, 1);
case SCSI_IOCTL_STOP_UNIT:
return scsi_send_start_stop(sdev, 0);
case SCSI_IOCTL_GET_PCI:
return scsi_ioctl_get_pci(sdev, arg);
case SG_SCSI_RESET:
return scsi_ioctl_reset(sdev, arg);
}
#ifdef CONFIG_COMPAT
if (in_compat_syscall()) {
if (!sdev->host->hostt->compat_ioctl)
return -EINVAL;
return sdev->host->hostt->compat_ioctl(sdev, cmd, arg);
}
#endif
if (!sdev->host->hostt->ioctl)
return -EINVAL;
return sdev->host->hostt->ioctl(sdev, cmd, arg);
}
EXPORT_SYMBOL(scsi_ioctl);
/*
* We can process a reset even when a device isn't fully operable.
*/
int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev, int cmd,
bool ndelay)
{
if (cmd == SG_SCSI_RESET && ndelay) {
if (scsi_host_in_recovery(sdev->host))
return -EAGAIN;
} else {
if (!scsi_block_when_processing_errors(sdev))
return -ENODEV;
}
return 0;
}
EXPORT_SYMBOL_GPL(scsi_ioctl_block_when_processing_errors);
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