| /* |
| * 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 <asm/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 sg_get_reserved_size(struct request_queue *q, int __user *p) |
| { |
| unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9); |
| |
| 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; |
| if (size > (queue_max_sectors(q) << 9)) |
| size = queue_max_sectors(q) << 9; |
| |
| q->sg_reserved_size = size; |
| 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, 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(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; |
| |
| /* if there's no filter set, assume we're filtering everything out */ |
| if (!filter) |
| return -EPERM; |
| |
| /* 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) |
| { |
| if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len)) |
| return -EFAULT; |
| if (blk_verify_command(rq->cmd, mode & FMODE_WRITE)) |
| return -EPERM; |
| |
| /* |
| * fill in request structure |
| */ |
| rq->cmd_len = hdr->cmd_len; |
| rq->cmd_type = REQ_TYPE_BLOCK_PC; |
| |
| 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) |
| { |
| 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 = rq->resid_len; |
| hdr->sb_len_wr = 0; |
| |
| if (rq->sense_len && hdr->sbp) { |
| int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len); |
| |
| if (!copy_to_user(hdr->sbp, rq->sense, len)) |
| hdr->sb_len_wr = len; |
| else |
| ret = -EFAULT; |
| } |
| |
| r = blk_rq_unmap_user(bio); |
| if (!ret) |
| ret = r; |
| blk_put_request(rq); |
| |
| 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; |
| int writing = 0, ret = 0; |
| struct request *rq; |
| char sense[SCSI_SENSE_BUFFERSIZE]; |
| struct bio *bio; |
| |
| if (hdr->interface_id != 'S') |
| return -EINVAL; |
| if (hdr->cmd_len > BLK_MAX_CDB) |
| 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; |
| } |
| |
| rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); |
| if (!rq) |
| return -ENOMEM; |
| |
| if (blk_fill_sghdr_rq(q, rq, hdr, mode)) { |
| blk_put_request(rq); |
| return -EFAULT; |
| } |
| |
| if (hdr->iovec_count) { |
| const int size = sizeof(struct sg_iovec) * hdr->iovec_count; |
| size_t iov_data_len; |
| struct sg_iovec *sg_iov; |
| struct iovec *iov; |
| int i; |
| |
| sg_iov = kmalloc(size, GFP_KERNEL); |
| if (!sg_iov) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| if (copy_from_user(sg_iov, hdr->dxferp, size)) { |
| kfree(sg_iov); |
| ret = -EFAULT; |
| goto out; |
| } |
| |
| /* |
| * Sum up the vecs, making sure they don't overflow |
| */ |
| iov = (struct iovec *) sg_iov; |
| iov_data_len = 0; |
| for (i = 0; i < hdr->iovec_count; i++) { |
| if (iov_data_len + iov[i].iov_len < iov_data_len) { |
| kfree(sg_iov); |
| ret = -EINVAL; |
| goto out; |
| } |
| iov_data_len += iov[i].iov_len; |
| } |
| |
| /* SG_IO howto says that the shorter of the two wins */ |
| if (hdr->dxfer_len < iov_data_len) { |
| hdr->iovec_count = iov_shorten(iov, |
| hdr->iovec_count, |
| hdr->dxfer_len); |
| iov_data_len = hdr->dxfer_len; |
| } |
| |
| ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count, |
| iov_data_len, GFP_KERNEL); |
| kfree(sg_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; |
| |
| bio = rq->bio; |
| memset(sense, 0, sizeof(sense)); |
| rq->sense = sense; |
| rq->sense_len = 0; |
| 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, 0); |
| |
| hdr->duration = jiffies_to_msecs(jiffies - start_time); |
| |
| return blk_complete_sghdr_rq(rq, hdr, bio); |
| out: |
| 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; |
| int err; |
| unsigned int in_len, out_len, bytes, opcode, cmdlen; |
| char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE]; |
| |
| 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 ? WRITE : READ, __GFP_WAIT); |
| |
| cmdlen = COMMAND_SIZE(opcode); |
| |
| /* |
| * get command and data to send to device, if any |
| */ |
| err = -EFAULT; |
| rq->cmd_len = cmdlen; |
| if (copy_from_user(rq->cmd, sic->data, cmdlen)) |
| goto error; |
| |
| if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
| goto error; |
| |
| err = blk_verify_command(rq->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_WAIT)) { |
| err = DRIVER_ERROR << 24; |
| goto error; |
| } |
| |
| memset(sense, 0, sizeof(sense)); |
| rq->sense = sense; |
| rq->sense_len = 0; |
| rq->cmd_type = REQ_TYPE_BLOCK_PC; |
| |
| blk_execute_rq(q, disk, rq, 0); |
| |
| err = rq->errors & 0xff; /* only 8 bit SCSI status */ |
| if (err) { |
| if (rq->sense_len && rq->sense) { |
| bytes = (OMAX_SB_LEN > rq->sense_len) ? |
| rq->sense_len : OMAX_SB_LEN; |
| if (copy_to_user(sic->data, rq->sense, bytes)) |
| err = -EFAULT; |
| } |
| } else { |
| if (copy_to_user(sic->data, buffer, out_len)) |
| err = -EFAULT; |
| } |
| |
| error: |
| kfree(buffer); |
| blk_put_request(rq); |
| 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, WRITE, __GFP_WAIT); |
| rq->cmd_type = REQ_TYPE_BLOCK_PC; |
| rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
| rq->cmd[0] = cmd; |
| rq->cmd[4] = data; |
| rq->cmd_len = 6; |
| err = blk_execute_rq(q, bd_disk, rq, 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); |
| |
| 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); |