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block/scsi_ioctl.c
17.1 KB
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/* * 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> |
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#include <linux/capability.h> |
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#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. */ |
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const unsigned char scsi_command_size_tbl[8] = |
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{ 6, 10, 10, 12, 16, 12, 10, 10 }; |
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EXPORT_SYMBOL(scsi_command_size_tbl); |
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|
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#include <scsi/sg.h> static int sg_get_version(int __user *p) { |
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static const int sg_version_num = 30527; |
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return put_user(sg_version_num, p); } |
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static int scsi_get_idlun(struct request_queue *q, int __user *p) |
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{ return put_user(0, p); } |
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static int scsi_get_bus(struct request_queue *q, int __user *p) |
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{ return put_user(0, p); } |
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static int sg_get_timeout(struct request_queue *q) |
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{ |
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return jiffies_to_clock_t(q->sg_timeout); |
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} |
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static int sg_set_timeout(struct request_queue *q, int __user *p) |
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{ int timeout, err = get_user(timeout, p); if (!err) |
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q->sg_timeout = clock_t_to_jiffies(timeout); |
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return err; } |
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static int sg_get_reserved_size(struct request_queue *q, int __user *p) |
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{ |
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unsigned val = min(q->sg_reserved_size, q->max_sectors << 9); return put_user(val, p); |
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} |
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static int sg_set_reserved_size(struct request_queue *q, int __user *p) |
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{ 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??) */ |
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static int sg_emulated_host(struct request_queue *q, int __user *p) |
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{ return put_user(1, p); } |
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void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) |
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{ /* 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); |
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__set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); |
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} EXPORT_SYMBOL_GPL(blk_set_cmd_filter_defaults); |
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static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, |
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struct sg_io_hdr *hdr, fmode_t mode) |
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{ |
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if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len)) return -EFAULT; |
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if (blk_verify_command(&q->cmd_filter, rq->cmd, mode & FMODE_WRITE)) |
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return -EPERM; /* * fill in request structure */ rq->cmd_len = hdr->cmd_len; rq->cmd_type = REQ_TYPE_BLOCK_PC; |
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rq->timeout = msecs_to_jiffies(hdr->timeout); |
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if (!rq->timeout) rq->timeout = q->sg_timeout; if (!rq->timeout) rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
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if (rq->timeout < BLK_MIN_SG_TIMEOUT) rq->timeout = BLK_MIN_SG_TIMEOUT; |
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return 0; } |
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/* * unmap a request that was previously mapped to this sg_io_hdr. handles * both sg and non-sg sg_io_hdr. */ |
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static int blk_unmap_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr) |
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{ |
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blk_rq_unmap_user(rq->bio); |
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blk_put_request(rq); return 0; } |
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|
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static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, struct bio *bio) |
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{ 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; |
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hdr->resid = rq->data_len; |
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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; } |
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|
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static int sg_io(struct request_queue *q, struct gendisk *bd_disk, struct sg_io_hdr *hdr, fmode_t mode) |
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{ |
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unsigned long start_time; |
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int writing = 0, ret = 0; |
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struct request *rq; |
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char sense[SCSI_SENSE_BUFFERSIZE]; |
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struct bio *bio; |
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if (hdr->interface_id != 'S') return -EINVAL; if (hdr->cmd_len > BLK_MAX_CDB) return -EINVAL; |
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|
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if (hdr->dxfer_len > (q->max_hw_sectors << 9)) |
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return -EIO; |
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if (hdr->dxfer_len) |
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switch (hdr->dxfer_direction) { default: return -EINVAL; |
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case SG_DXFER_TO_DEV: writing = 1; break; |
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case SG_DXFER_TO_FROM_DEV: |
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case SG_DXFER_FROM_DEV: |
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break; } |
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rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); if (!rq) return -ENOMEM; |
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|
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if (blk_fill_sghdr_rq(q, rq, hdr, mode)) { |
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blk_put_request(rq); return -EFAULT; } |
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|
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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; } |
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ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count, |
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hdr->dxfer_len, GFP_KERNEL); |
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kfree(iov); } else if (hdr->dxfer_len) |
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ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, |
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GFP_KERNEL); |
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if (ret) goto out; |
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bio = rq->bio; |
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memset(sense, 0, sizeof(sense)); rq->sense = sense; rq->sense_len = 0; |
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rq->retries = 0; |
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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. */ |
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blk_execute_rq(q, bd_disk, rq, 0); |
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|
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hdr->duration = jiffies_to_msecs(jiffies - start_time); |
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|
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return blk_complete_sghdr_rq(rq, hdr, bio); |
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out: blk_put_request(rq); return ret; |
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} |
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/** * 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. */ |
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#define OMAX_SB_LEN 16 /* For backward compatibility */ |
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int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, struct scsi_ioctl_command __user *sic) |
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{ struct request *rq; |
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int err; |
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unsigned int in_len, out_len, bytes, opcode, cmdlen; char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE]; |
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if (!sic) return -EINVAL; |
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/* * 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) { |
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buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); |
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if (!buffer) return -ENOMEM; |
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} 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; |
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if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
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goto error; |
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err = blk_verify_command(&q->cmd_filter, rq->cmd, mode & FMODE_WRITE); |
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if (err) goto error; |
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/* default. possible overriden later */ rq->retries = 5; |
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switch (opcode) { |
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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: |
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rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
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break; } if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) { err = DRIVER_ERROR << 24; goto out; |
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} memset(sense, 0, sizeof(sense)); rq->sense = sense; rq->sense_len = 0; |
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rq->cmd_type = REQ_TYPE_BLOCK_PC; |
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|
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blk_execute_rq(q, disk, rq, 0); out: |
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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; } |
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EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |
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/* Send basic block requests */ |
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static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, int cmd, int data) |
f98d2dfd0 [PATCH] block: Cl... |
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{ struct request *rq; int err; rq = blk_get_request(q, WRITE, __GFP_WAIT); |
4aff5e233 [PATCH] Split str... |
480 |
rq->cmd_type = REQ_TYPE_BLOCK_PC; |
f98d2dfd0 [PATCH] block: Cl... |
481 482 |
rq->data = NULL; rq->data_len = 0; |
7a85f8896 block: restore th... |
483 |
rq->extra_len = 0; |
3d6392cfb bsg: support for ... |
484 |
rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
f98d2dfd0 [PATCH] block: Cl... |
485 486 487 488 489 490 491 492 |
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; } |
165125e1e [BLOCK] Get rid o... |
493 494 |
static inline int blk_send_start_stop(struct request_queue *q, struct gendisk *bd_disk, int data) |
f98d2dfd0 [PATCH] block: Cl... |
495 496 497 |
{ return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); } |
74f3c8aff [PATCH] switch sc... |
498 499 |
int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, unsigned int cmd, void __user *arg) |
1da177e4c Linux-2.6.12-rc2 |
500 |
{ |
f98d2dfd0 [PATCH] block: Cl... |
501 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
502 |
|
45e79a3ac bsg: add a reques... |
503 |
if (!q || blk_get_queue(q)) |
1da177e4c Linux-2.6.12-rc2 |
504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 |
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; |
74f3c8aff [PATCH] switch sc... |
540 |
err = sg_io(q, bd_disk, &hdr, mode); |
1da177e4c Linux-2.6.12-rc2 |
541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 |
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); |
ad337591f [SCSI] block: Fix... |
584 |
hdr.timeout = jiffies_to_msecs(cgc.timeout); |
1da177e4c Linux-2.6.12-rc2 |
585 586 |
hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; hdr.cmd_len = sizeof(cgc.cmd); |
74f3c8aff [PATCH] switch sc... |
587 |
err = sg_io(q, bd_disk, &hdr, mode); |
1da177e4c Linux-2.6.12-rc2 |
588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 |
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 ", current->comm); err = -EINVAL; if (!arg) break; |
74f3c8aff [PATCH] switch sc... |
611 |
err = sg_scsi_ioctl(q, bd_disk, mode, arg); |
1da177e4c Linux-2.6.12-rc2 |
612 613 |
break; case CDROMCLOSETRAY: |
f98d2dfd0 [PATCH] block: Cl... |
614 615 |
err = blk_send_start_stop(q, bd_disk, 0x03); break; |
1da177e4c Linux-2.6.12-rc2 |
616 |
case CDROMEJECT: |
f98d2dfd0 [PATCH] block: Cl... |
617 |
err = blk_send_start_stop(q, bd_disk, 0x02); |
1da177e4c Linux-2.6.12-rc2 |
618 619 620 621 622 623 624 625 626 627 |
break; default: err = -ENOTTY; } blk_put_queue(q); return err; } EXPORT_SYMBOL(scsi_cmd_ioctl); |