[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/block/scsi_ioctl.c b/src/kernel/linux/v4.14/block/scsi_ioctl.c
new file mode 100644
index 0000000..7440de4
--- /dev/null
+++ b/src/kernel/linux/v4.14/block/scsi_ioctl.c
@@ -0,0 +1,764 @@
+/*
+ * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public Licens
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/capability.h>
+#include <linux/completion.h>
+#include <linux/cdrom.h>
+#include <linux/ratelimit.h>
+#include <linux/slab.h>
+#include <linux/times.h>
+#include <linux/uio.h>
+#include <linux/uaccess.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/scsi_cmnd.h>
+
+struct blk_cmd_filter {
+ unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
+ unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
+};
+
+static struct blk_cmd_filter blk_default_cmd_filter;
+
+/* Command group 3 is reserved and should never be used. */
+const unsigned char scsi_command_size_tbl[8] =
+{
+ 6, 10, 10, 12,
+ 16, 12, 10, 10
+};
+EXPORT_SYMBOL(scsi_command_size_tbl);
+
+#include <scsi/sg.h>
+
+static int sg_get_version(int __user *p)
+{
+ static const int sg_version_num = 30527;
+ return put_user(sg_version_num, p);
+}
+
+static int scsi_get_idlun(struct request_queue *q, int __user *p)
+{
+ return put_user(0, p);
+}
+
+static int scsi_get_bus(struct request_queue *q, int __user *p)
+{
+ return put_user(0, p);
+}
+
+static int sg_get_timeout(struct request_queue *q)
+{
+ return jiffies_to_clock_t(q->sg_timeout);
+}
+
+static int sg_set_timeout(struct request_queue *q, int __user *p)
+{
+ int timeout, err = get_user(timeout, p);
+
+ if (!err)
+ q->sg_timeout = clock_t_to_jiffies(timeout);
+
+ return err;
+}
+
+static int max_sectors_bytes(struct request_queue *q)
+{
+ unsigned int max_sectors = queue_max_sectors(q);
+
+ max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
+
+ return max_sectors << 9;
+}
+
+static int sg_get_reserved_size(struct request_queue *q, int __user *p)
+{
+ int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
+
+ return put_user(val, p);
+}
+
+static int sg_set_reserved_size(struct request_queue *q, int __user *p)
+{
+ int size, err = get_user(size, p);
+
+ if (err)
+ return err;
+
+ if (size < 0)
+ return -EINVAL;
+
+ q->sg_reserved_size = min(size, max_sectors_bytes(q));
+ 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 void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
+{
+ /* Basic read-only commands */
+ __set_bit(TEST_UNIT_READY, filter->read_ok);
+ __set_bit(REQUEST_SENSE, filter->read_ok);
+ __set_bit(READ_6, filter->read_ok);
+ __set_bit(READ_10, filter->read_ok);
+ __set_bit(READ_12, filter->read_ok);
+ __set_bit(READ_16, filter->read_ok);
+ __set_bit(READ_BUFFER, filter->read_ok);
+ __set_bit(READ_DEFECT_DATA, filter->read_ok);
+ __set_bit(READ_CAPACITY, filter->read_ok);
+ __set_bit(READ_LONG, filter->read_ok);
+ __set_bit(INQUIRY, filter->read_ok);
+ __set_bit(MODE_SENSE, filter->read_ok);
+ __set_bit(MODE_SENSE_10, filter->read_ok);
+ __set_bit(LOG_SENSE, filter->read_ok);
+ __set_bit(START_STOP, filter->read_ok);
+ __set_bit(GPCMD_VERIFY_10, filter->read_ok);
+ __set_bit(VERIFY_16, filter->read_ok);
+ __set_bit(REPORT_LUNS, filter->read_ok);
+ __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
+ __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
+ __set_bit(MAINTENANCE_IN, filter->read_ok);
+ __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
+
+ /* Audio CD commands */
+ __set_bit(GPCMD_PLAY_CD, filter->read_ok);
+ __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
+ __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
+ __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
+ __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
+
+ /* CD/DVD data reading */
+ __set_bit(GPCMD_READ_CD, filter->read_ok);
+ __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
+ __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
+ __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
+ __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
+ __set_bit(GPCMD_READ_HEADER, filter->read_ok);
+ __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
+ __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
+ __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
+ __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
+ __set_bit(GPCMD_SCAN, filter->read_ok);
+ __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
+ __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
+ __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
+ __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
+ __set_bit(GPCMD_SEEK, filter->read_ok);
+ __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
+
+ /* Basic writing commands */
+ __set_bit(WRITE_6, filter->write_ok);
+ __set_bit(WRITE_10, filter->write_ok);
+ __set_bit(WRITE_VERIFY, filter->write_ok);
+ __set_bit(WRITE_12, filter->write_ok);
+ __set_bit(WRITE_VERIFY_12, filter->write_ok);
+ __set_bit(WRITE_16, filter->write_ok);
+ __set_bit(WRITE_LONG, filter->write_ok);
+ __set_bit(WRITE_LONG_2, filter->write_ok);
+ __set_bit(WRITE_SAME, filter->write_ok);
+ __set_bit(WRITE_SAME_16, filter->write_ok);
+ __set_bit(WRITE_SAME_32, filter->write_ok);
+ __set_bit(ERASE, filter->write_ok);
+ __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
+ __set_bit(MODE_SELECT, filter->write_ok);
+ __set_bit(LOG_SELECT, filter->write_ok);
+ __set_bit(GPCMD_BLANK, filter->write_ok);
+ __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
+ __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
+ __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
+ __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
+ __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
+ __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
+ __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
+ __set_bit(GPCMD_SEND_KEY, filter->write_ok);
+ __set_bit(GPCMD_SEND_OPC, filter->write_ok);
+ __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
+ __set_bit(GPCMD_SET_SPEED, filter->write_ok);
+ __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
+ __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
+ __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
+ __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
+}
+
+int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
+{
+ struct blk_cmd_filter *filter = &blk_default_cmd_filter;
+
+ /* root can do any command. */
+ if (capable(CAP_SYS_RAWIO))
+ return 0;
+
+ /* Anybody who can open the device can do a read-safe command */
+ if (test_bit(cmd[0], filter->read_ok))
+ return 0;
+
+ /* Write-safe commands require a writable open */
+ if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
+ return 0;
+
+ return -EPERM;
+}
+EXPORT_SYMBOL(blk_verify_command);
+
+static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
+ struct sg_io_hdr *hdr, fmode_t mode)
+{
+ struct scsi_request *req = scsi_req(rq);
+
+ if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
+ return -EFAULT;
+ if (blk_verify_command(req->cmd, mode & FMODE_WRITE))
+ return -EPERM;
+
+ /*
+ * fill in request structure
+ */
+ req->cmd_len = hdr->cmd_len;
+
+ rq->timeout = msecs_to_jiffies(hdr->timeout);
+ if (!rq->timeout)
+ rq->timeout = q->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 blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
+ struct bio *bio)
+{
+ struct scsi_request *req = scsi_req(rq);
+ int r, ret = 0;
+
+ /*
+ * fill in all the output members
+ */
+ hdr->status = req->result & 0xff;
+ hdr->masked_status = status_byte(req->result);
+ hdr->msg_status = msg_byte(req->result);
+ hdr->host_status = host_byte(req->result);
+ hdr->driver_status = driver_byte(req->result);
+ hdr->info = 0;
+ if (hdr->masked_status || hdr->host_status || hdr->driver_status)
+ hdr->info |= SG_INFO_CHECK;
+ hdr->resid = req->resid_len;
+ hdr->sb_len_wr = 0;
+
+ if (req->sense_len && hdr->sbp) {
+ int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);
+
+ if (!copy_to_user(hdr->sbp, req->sense, 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 request_queue *q, struct gendisk *bd_disk,
+ 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_request *req;
+ struct bio *bio;
+
+ if (hdr->interface_id != 'S')
+ return -EINVAL;
+
+ if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 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;
+
+ ret = -ENOMEM;
+ rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN,
+ GFP_KERNEL);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+ req = scsi_req(rq);
+
+ if (hdr->cmd_len > BLK_MAX_CDB) {
+ req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
+ if (!req->cmd)
+ goto out_put_request;
+ }
+
+ ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
+ if (ret < 0)
+ goto out_free_cdb;
+
+ ret = 0;
+ if (hdr->iovec_count) {
+ struct iov_iter i;
+ struct iovec *iov = NULL;
+
+ ret = import_iovec(rq_data_dir(rq),
+ hdr->dxferp, hdr->iovec_count,
+ 0, &iov, &i);
+ if (ret < 0)
+ goto out_free_cdb;
+
+ /* SG_IO howto says that the shorter of the two wins */
+ iov_iter_truncate(&i, hdr->dxfer_len);
+
+ ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
+ kfree(iov);
+ } else if (hdr->dxfer_len)
+ ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
+ GFP_KERNEL);
+
+ if (ret)
+ goto out_free_cdb;
+
+ bio = rq->bio;
+ req->retries = 0;
+
+ start_time = jiffies;
+
+ /* ignore return value. All information is passed back to caller
+ * (if he doesn't check that is his problem).
+ * N.B. a non-zero SCSI status is _not_ necessarily an error.
+ */
+ blk_execute_rq(q, bd_disk, rq, at_head);
+
+ hdr->duration = jiffies_to_msecs(jiffies - start_time);
+
+ ret = blk_complete_sghdr_rq(rq, hdr, bio);
+
+out_free_cdb:
+ scsi_req_free_cmd(req);
+out_put_request:
+ blk_put_request(rq);
+ return ret;
+}
+
+/**
+ * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
+ * @file: file this ioctl operates on (optional)
+ * @q: request queue to send scsi commands down
+ * @disk: gendisk to operate on (option)
+ * @sic: userspace structure describing the command to perform
+ *
+ * Send down the scsi command described by @sic to the device below
+ * the request queue @q. If @file is non-NULL it's used to perform
+ * fine-grained permission checks that allow users to send down
+ * non-destructive SCSI commands. If the caller has a struct gendisk
+ * available it should be passed in as @disk to allow the low level
+ * driver to use the information contained in it. A non-NULL @disk
+ * is only allowed if the caller knows that the low level driver doesn't
+ * need it (e.g. in the scsi subsystem).
+ *
+ * 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.
+ */
+#define OMAX_SB_LEN 16 /* For backward compatibility */
+int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
+ struct scsi_ioctl_command __user *sic)
+{
+ struct request *rq;
+ struct scsi_request *req;
+ int err;
+ unsigned int in_len, out_len, bytes, opcode, cmdlen;
+ 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, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
+ if (!buffer)
+ return -ENOMEM;
+
+ }
+
+ rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN,
+ __GFP_RECLAIM);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto error_free_buffer;
+ }
+ req = scsi_req(rq);
+
+ cmdlen = COMMAND_SIZE(opcode);
+
+ /*
+ * get command and data to send to device, if any
+ */
+ err = -EFAULT;
+ req->cmd_len = cmdlen;
+ if (copy_from_user(req->cmd, sic->data, cmdlen))
+ goto error;
+
+ if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
+ goto error;
+
+ err = blk_verify_command(req->cmd, mode & FMODE_WRITE);
+ if (err)
+ goto error;
+
+ /* default. possible overriden later */
+ req->retries = 5;
+
+ switch (opcode) {
+ case SEND_DIAGNOSTIC:
+ case FORMAT_UNIT:
+ rq->timeout = FORMAT_UNIT_TIMEOUT;
+ req->retries = 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;
+ req->retries = 1;
+ break;
+ default:
+ rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
+ break;
+ }
+
+ if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) {
+ err = DRIVER_ERROR << 24;
+ goto error;
+ }
+
+ blk_execute_rq(q, disk, rq, 0);
+
+ err = req->result & 0xff; /* only 8 bit SCSI status */
+ if (err) {
+ if (req->sense_len && req->sense) {
+ bytes = (OMAX_SB_LEN > req->sense_len) ?
+ req->sense_len : OMAX_SB_LEN;
+ if (copy_to_user(sic->data, req->sense, bytes))
+ err = -EFAULT;
+ }
+ } else {
+ if (copy_to_user(sic->data, buffer, out_len))
+ err = -EFAULT;
+ }
+
+error:
+ blk_put_request(rq);
+
+error_free_buffer:
+ kfree(buffer);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
+
+/* Send basic block requests */
+static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
+ int cmd, int data)
+{
+ struct request *rq;
+ int err;
+
+ rq = blk_get_request(q, REQ_OP_SCSI_OUT, __GFP_RECLAIM);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+ rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
+ scsi_req(rq)->cmd[0] = cmd;
+ scsi_req(rq)->cmd[4] = data;
+ scsi_req(rq)->cmd_len = 6;
+ blk_execute_rq(q, bd_disk, rq, 0);
+ err = scsi_req(rq)->result ? -EIO : 0;
+ blk_put_request(rq);
+
+ return err;
+}
+
+static inline int blk_send_start_stop(struct request_queue *q,
+ struct gendisk *bd_disk, int data)
+{
+ return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
+}
+
+int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
+ unsigned int cmd, void __user *arg)
+{
+ int err;
+
+ if (!q)
+ return -ENXIO;
+
+ switch (cmd) {
+ /*
+ * new sgv3 interface
+ */
+ case SG_GET_VERSION_NUM:
+ err = sg_get_version(arg);
+ break;
+ case SCSI_IOCTL_GET_IDLUN:
+ err = scsi_get_idlun(q, arg);
+ break;
+ case SCSI_IOCTL_GET_BUS_NUMBER:
+ err = scsi_get_bus(q, arg);
+ break;
+ case SG_SET_TIMEOUT:
+ err = sg_set_timeout(q, arg);
+ break;
+ case SG_GET_TIMEOUT:
+ err = sg_get_timeout(q);
+ break;
+ case SG_GET_RESERVED_SIZE:
+ err = sg_get_reserved_size(q, arg);
+ break;
+ case SG_SET_RESERVED_SIZE:
+ err = sg_set_reserved_size(q, arg);
+ break;
+ case SG_EMULATED_HOST:
+ err = sg_emulated_host(q, arg);
+ break;
+ case SG_IO: {
+ struct sg_io_hdr hdr;
+
+ err = -EFAULT;
+ if (copy_from_user(&hdr, arg, sizeof(hdr)))
+ break;
+ err = sg_io(q, bd_disk, &hdr, mode);
+ if (err == -EFAULT)
+ break;
+
+ if (copy_to_user(arg, &hdr, sizeof(hdr)))
+ err = -EFAULT;
+ break;
+ }
+ case CDROM_SEND_PACKET: {
+ struct cdrom_generic_command cgc;
+ struct sg_io_hdr hdr;
+
+ err = -EFAULT;
+ if (copy_from_user(&cgc, arg, sizeof(cgc)))
+ break;
+ 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;
+ err = 0;
+ 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:
+ err = -EINVAL;
+ }
+ if (err)
+ break;
+
+ 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(q, bd_disk, &hdr, mode);
+ if (err == -EFAULT)
+ break;
+
+ if (hdr.status)
+ err = -EIO;
+
+ cgc.stat = err;
+ cgc.buflen = hdr.resid;
+ if (copy_to_user(arg, &cgc, sizeof(cgc)))
+ err = -EFAULT;
+
+ break;
+ }
+
+ /*
+ * old junk scsi send command ioctl
+ */
+ case SCSI_IOCTL_SEND_COMMAND:
+ printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
+ err = -EINVAL;
+ if (!arg)
+ break;
+
+ err = sg_scsi_ioctl(q, bd_disk, mode, arg);
+ break;
+ case CDROMCLOSETRAY:
+ err = blk_send_start_stop(q, bd_disk, 0x03);
+ break;
+ case CDROMEJECT:
+ err = blk_send_start_stop(q, bd_disk, 0x02);
+ break;
+ default:
+ err = -ENOTTY;
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(scsi_cmd_ioctl);
+
+int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
+{
+ if (bd && bd == bd->bd_contains)
+ return 0;
+
+ /* Actually none of these is particularly useful on a partition,
+ * but they are safe.
+ */
+ switch (cmd) {
+ case SCSI_IOCTL_GET_IDLUN:
+ case SCSI_IOCTL_GET_BUS_NUMBER:
+ case SCSI_IOCTL_GET_PCI:
+ case SCSI_IOCTL_PROBE_HOST:
+ case SG_GET_VERSION_NUM:
+ case SG_SET_TIMEOUT:
+ case SG_GET_TIMEOUT:
+ case SG_GET_RESERVED_SIZE:
+ case SG_SET_RESERVED_SIZE:
+ case SG_EMULATED_HOST:
+ return 0;
+ case CDROM_GET_CAPABILITY:
+ /* Keep this until we remove the printk below. udev sends it
+ * and we do not want to spam dmesg about it. CD-ROMs do
+ * not have partitions, so we get here only for disks.
+ */
+ return -ENOIOCTLCMD;
+ default:
+ break;
+ }
+
+ if (capable(CAP_SYS_RAWIO))
+ return 0;
+
+ /* In particular, rule out all resets and host-specific ioctls. */
+ printk_ratelimited(KERN_WARNING
+ "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
+
+ return -ENOIOCTLCMD;
+}
+EXPORT_SYMBOL(scsi_verify_blk_ioctl);
+
+int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
+ unsigned int cmd, void __user *arg)
+{
+ int ret;
+
+ ret = scsi_verify_blk_ioctl(bd, cmd);
+ if (ret < 0)
+ return ret;
+
+ return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
+}
+EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
+
+/**
+ * scsi_req_init - initialize certain fields of a scsi_request structure
+ * @req: Pointer to a scsi_request structure.
+ * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members
+ * of struct scsi_request.
+ */
+void scsi_req_init(struct scsi_request *req)
+{
+ memset(req->__cmd, 0, sizeof(req->__cmd));
+ req->cmd = req->__cmd;
+ req->cmd_len = BLK_MAX_CDB;
+ req->sense_len = 0;
+}
+EXPORT_SYMBOL(scsi_req_init);
+
+static int __init blk_scsi_ioctl_init(void)
+{
+ blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
+ return 0;
+}
+fs_initcall(blk_scsi_ioctl_init);