cregit-Linux how code gets into the kernel

Release 4.11 block/scsi_ioctl.c

Directory: block
/*
 * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2492.31%133.33%
Arjan van de Ven13.85%133.33%
Al Viro13.85%133.33%
Total26100.00%3100.00%


static int scsi_get_idlun(struct request_queue *q, int __user *p) { return put_user(0, p); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2187.50%133.33%
Jens Axboe28.33%133.33%
Al Viro14.17%133.33%
Total24100.00%3100.00%


static int scsi_get_bus(struct request_queue *q, int __user *p) { return put_user(0, p); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2187.50%133.33%
Jens Axboe28.33%133.33%
Al Viro14.17%133.33%
Total24100.00%3100.00%


static int sg_get_timeout(struct request_queue *q) { return jiffies_to_clock_t(q->sg_timeout); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds1157.89%125.00%
Jens Axboe526.32%250.00%
Milton D. Miller II315.79%125.00%
Total19100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2555.56%120.00%
Jens Axboe1635.56%240.00%
Milton D. Miller II36.67%120.00%
Al Viro12.22%120.00%
Total45100.00%5100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Akinobu Mita37100.00%1100.00%
Total37100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds1843.90%114.29%
Alan Stern1024.39%114.29%
Jens Axboe512.20%228.57%
Akinobu Mita512.20%114.29%
Martin K. Petersen24.88%114.29%
Al Viro12.44%114.29%
Total41100.00%7100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds3150.00%114.29%
Jens Axboe1524.19%342.86%
Akinobu Mita812.90%114.29%
Pat LaVarre711.29%114.29%
Al Viro11.61%114.29%
Total62100.00%7100.00%

/* * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2187.50%133.33%
Jens Axboe28.33%133.33%
Al Viro14.17%133.33%
Total24100.00%3100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
FUJITA Tomonori65294.49%233.33%
Mauricio Faria de Oliveira273.91%116.67%
Monty at xiph.org91.30%116.67%
Hannes Reinecke10.14%116.67%
Jens Axboe10.14%116.67%
Total690100.00%6100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe74100.00%1100.00%
Total74100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe4633.58%738.89%
Linus Torvalds4432.12%316.67%
Al Viro1510.95%211.11%
Christoph Hellwig139.49%15.56%
Mike Christie118.03%15.56%
FUJITA Tomonori53.65%316.67%
Tejun Heo32.19%15.56%
Total137100.00%18100.00%


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 = rq->errors & 0xff; hdr->masked_status = status_byte(rq->errors); hdr->msg_status = msg_byte(rq->errors); hdr->host_status = host_byte(rq->errors); hdr->driver_status = driver_byte(rq->errors); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe16377.62%112.50%
Christoph Hellwig146.67%112.50%
FUJITA Tomonori146.67%225.00%
Mike Christie125.71%112.50%
Boaz Harrosh41.90%112.50%
Linus Torvalds20.95%112.50%
Tejun Heo10.48%112.50%
Total210100.00%8100.00%


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); scsi_req_init(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; rq->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; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe20447.78%1027.78%
Christoph Hellwig6815.93%411.11%
James Bottomley378.67%38.33%
Kent Overstreet245.62%25.56%
Douglas Gilbert194.45%25.56%
FUJITA Tomonori143.28%38.33%
Tejun Heo143.28%25.56%
Al Viro133.04%25.56%
Mike Christie122.81%25.56%
Joe Lawrence71.64%12.78%
Paolo Bonzini61.41%12.78%
Sabrina Dubroca30.70%12.78%
Martin K. Petersen30.70%12.78%
Christian Engelmayer20.47%12.78%
Patrick Mansfield10.23%12.78%
Total427100.00%36100.00%

/** * 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); scsi_req_init(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 */ rq->retries = 5; switch (opcode) { case SEND_DIAGNOSTIC: case FORMAT_UNIT: rq->timeout = FORMAT_UNIT_TIMEOUT; rq->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; rq->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 = rq->errors & 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe28154.67%414.29%
Christoph Hellwig8416.34%310.71%
Linus Torvalds6713.04%310.71%
Douglas Gilbert326.23%27.14%
Joe Lawrence183.50%27.14%
Tony Battersby112.14%27.14%
Al Viro81.56%310.71%
James Bottomley40.78%27.14%
FUJITA Tomonori20.39%27.14%
Mel Gorman20.39%13.57%
Alan Cox20.39%13.57%
Yoann Padioleau10.19%13.57%
Jan Kara10.19%13.57%
Patrick Mansfield10.19%13.57%
Total514100.00%28100.00%

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); scsi_req_init(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; err = blk_execute_rq(q, bd_disk, rq, 0); blk_put_request(rq); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Collins8974.79%111.11%
Joe Lawrence1310.92%222.22%
Christoph Hellwig119.24%222.22%
Jens Axboe54.20%333.33%
Mel Gorman10.84%111.11%
Total119100.00%9100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Collins3093.75%150.00%
Jens Axboe26.25%150.00%
Total32100.00%2100.00%


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