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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/scsi/scsi_ioctl.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/scsi/scsi_ioctl.c')
-rw-r--r--drivers/scsi/scsi_ioctl.c957
1 files changed, 957 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c
new file mode 100644
index 000000000..2d20da55f
--- /dev/null
+++ b/drivers/scsi/scsi_ioctl.c
@@ -0,0 +1,957 @@
+// 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;
+
+ SCSI_LOG_IOCTL(1, sdev_printk(KERN_INFO, sdev,
+ "Trying ioctl with scsi command %d\n", *cmd));
+
+ result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0,
+ &sshdr, timeout, retries, NULL);
+
+ 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 = 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))
+ 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);