diff options
Diffstat (limited to 'drivers/scsi/scsi_ioctl.c')
| -rw-r--r-- | drivers/scsi/scsi_ioctl.c | 957 |
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); |