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author | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
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committer | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
commit | fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204 (patch) | |
tree | 22962a4387943edc841c72a4e636a068c66d58fd /block/scsi_ioctl.c | |
download | ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.zip ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.tar.gz |
Initial import of modified Linux 2.6.28 tree
Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y
Diffstat (limited to 'block/scsi_ioctl.c')
-rw-r--r-- | block/scsi_ioctl.c | 652 |
1 files changed, 652 insertions, 0 deletions
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c new file mode 100644 index 0000000..d0bb92c --- /dev/null +++ b/block/scsi_ioctl.c @@ -0,0 +1,652 @@ +/* + * 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/slab.h> +#include <linux/times.h> +#include <asm/uaccess.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_ioctl.h> +#include <scsi/scsi_cmnd.h> + +/* 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 q->sg_timeout / (HZ / USER_HZ); +} + +static int sg_set_timeout(struct request_queue *q, int __user *p) +{ + int timeout, err = get_user(timeout, p); + + if (!err) + q->sg_timeout = timeout * (HZ / USER_HZ); + + return err; +} + +static int sg_get_reserved_size(struct request_queue *q, int __user *p) +{ + unsigned val = min(q->sg_reserved_size, q->max_sectors << 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 > (q->max_sectors << 9)) + size = q->max_sectors << 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); +} + +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); +} +EXPORT_SYMBOL_GPL(blk_set_cmd_filter_defaults); + +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(&q->cmd_filter, 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; +} + +/* + * unmap a request that was previously mapped to this sg_io_hdr. handles + * both sg and non-sg sg_io_hdr. + */ +static int blk_unmap_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr) +{ + blk_rq_unmap_user(rq->bio); + blk_put_request(rq); + 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->data_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; + } + + rq->bio = bio; + r = blk_unmap_sghdr_rq(rq, hdr); + if (ret) + r = ret; + + return r; +} + +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 > (q->max_hw_sectors << 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; + struct sg_iovec *iov; + + iov = kmalloc(size, GFP_KERNEL); + if (!iov) { + ret = -ENOMEM; + goto out; + } + + if (copy_from_user(iov, hdr->dxferp, size)) { + kfree(iov); + ret = -EFAULT; + goto out; + } + + ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count, + hdr->dxfer_len, 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; + + 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(&q->cmd_filter, 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 out; + } + + 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); + +out: + 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->data = NULL; + rq->data_len = 0; + rq->extra_len = 0; + 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 || blk_get_queue(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; + } + + blk_put_queue(q); + return err; +} + +EXPORT_SYMBOL(scsi_cmd_ioctl); |