--- /dev/null
+/*
+ * 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[8] =
+{
+ 6, 10, 10, 12,
+ 16, 12, 10, 10
+};
+
+EXPORT_SYMBOL(scsi_command_size);
+
+#define BLK_DEFAULT_TIMEOUT (60 * HZ)
+
+#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(request_queue_t *q, int __user *p)
+{
+ return put_user(0, p);
+}
+
+static int scsi_get_bus(request_queue_t *q, int __user *p)
+{
+ return put_user(0, p);
+}
+
+static int sg_get_timeout(request_queue_t *q)
+{
+ return q->sg_timeout / (HZ / USER_HZ);
+}
+
+static int sg_set_timeout(request_queue_t *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(request_queue_t *q, int __user *p)
+{
+ return put_user(q->sg_reserved_size, p);
+}
+
+static int sg_set_reserved_size(request_queue_t *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(request_queue_t *q, int __user *p)
+{
+ return put_user(1, p);
+}
+
+#define CMD_READ_SAFE 0x01
+#define CMD_WRITE_SAFE 0x02
+#define CMD_WARNED 0x04
+#define safe_for_read(cmd) [cmd] = CMD_READ_SAFE
+#define safe_for_write(cmd) [cmd] = CMD_WRITE_SAFE
+
+static int verify_command(struct file *file, unsigned char *cmd)
+{
+ static unsigned char cmd_type[256] = {
+
+ /* Basic read-only commands */
+ safe_for_read(TEST_UNIT_READY),
+ safe_for_read(REQUEST_SENSE),
+ safe_for_read(READ_6),
+ safe_for_read(READ_10),
+ safe_for_read(READ_12),
+ safe_for_read(READ_16),
+ safe_for_read(READ_BUFFER),
+ safe_for_read(READ_DEFECT_DATA),
+ safe_for_read(READ_LONG),
+ safe_for_read(INQUIRY),
+ safe_for_read(MODE_SENSE),
+ safe_for_read(MODE_SENSE_10),
+ safe_for_read(LOG_SENSE),
+ safe_for_read(START_STOP),
+ safe_for_read(GPCMD_VERIFY_10),
+ safe_for_read(VERIFY_16),
+
+ /* Audio CD commands */
+ safe_for_read(GPCMD_PLAY_CD),
+ safe_for_read(GPCMD_PLAY_AUDIO_10),
+ safe_for_read(GPCMD_PLAY_AUDIO_MSF),
+ safe_for_read(GPCMD_PLAY_AUDIO_TI),
+ safe_for_read(GPCMD_PAUSE_RESUME),
+
+ /* CD/DVD data reading */
+ safe_for_read(GPCMD_READ_BUFFER_CAPACITY),
+ safe_for_read(GPCMD_READ_CD),
+ safe_for_read(GPCMD_READ_CD_MSF),
+ safe_for_read(GPCMD_READ_DISC_INFO),
+ safe_for_read(GPCMD_READ_CDVD_CAPACITY),
+ safe_for_read(GPCMD_READ_DVD_STRUCTURE),
+ safe_for_read(GPCMD_READ_HEADER),
+ safe_for_read(GPCMD_READ_TRACK_RZONE_INFO),
+ safe_for_read(GPCMD_READ_SUBCHANNEL),
+ safe_for_read(GPCMD_READ_TOC_PMA_ATIP),
+ safe_for_read(GPCMD_REPORT_KEY),
+ safe_for_read(GPCMD_SCAN),
+ safe_for_read(GPCMD_GET_CONFIGURATION),
+ safe_for_read(GPCMD_READ_FORMAT_CAPACITIES),
+ safe_for_read(GPCMD_GET_EVENT_STATUS_NOTIFICATION),
+ safe_for_read(GPCMD_GET_PERFORMANCE),
+ safe_for_read(GPCMD_SEEK),
+ safe_for_read(GPCMD_STOP_PLAY_SCAN),
+
+ /* Basic writing commands */
+ safe_for_write(WRITE_6),
+ safe_for_write(WRITE_10),
+ safe_for_write(WRITE_VERIFY),
+ safe_for_write(WRITE_12),
+ safe_for_write(WRITE_VERIFY_12),
+ safe_for_write(WRITE_16),
+ safe_for_write(WRITE_LONG),
+ safe_for_write(WRITE_LONG_2),
+ safe_for_write(ERASE),
+ safe_for_write(GPCMD_MODE_SELECT_10),
+ safe_for_write(MODE_SELECT),
+ safe_for_write(LOG_SELECT),
+ safe_for_write(GPCMD_BLANK),
+ safe_for_write(GPCMD_CLOSE_TRACK),
+ safe_for_write(GPCMD_FLUSH_CACHE),
+ safe_for_write(GPCMD_FORMAT_UNIT),
+ safe_for_write(GPCMD_REPAIR_RZONE_TRACK),
+ safe_for_write(GPCMD_RESERVE_RZONE_TRACK),
+ safe_for_write(GPCMD_SEND_DVD_STRUCTURE),
+ safe_for_write(GPCMD_SEND_EVENT),
+ safe_for_write(GPCMD_SEND_KEY),
+ safe_for_write(GPCMD_SEND_OPC),
+ safe_for_write(GPCMD_SEND_CUE_SHEET),
+ safe_for_write(GPCMD_SET_SPEED),
+ safe_for_write(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL),
+ safe_for_write(GPCMD_LOAD_UNLOAD),
+ safe_for_write(GPCMD_SET_STREAMING),
+ };
+ unsigned char type = cmd_type[cmd[0]];
+ int has_write_perm = 0;
+
+ /* Anybody who can open the device can do a read-safe command */
+ if (type & CMD_READ_SAFE)
+ return 0;
+
+ /*
+ * file can be NULL from ioctl_by_bdev()...
+ */
+ if (file)
+ has_write_perm = file->f_mode & FMODE_WRITE;
+
+ /* Write-safe commands just require a writable open.. */
+ if ((type & CMD_WRITE_SAFE) && has_write_perm)
+ return 0;
+
+ /* And root can do any command.. */
+ if (capable(CAP_SYS_RAWIO))
+ return 0;
+
+ if (!type) {
+ cmd_type[cmd[0]] = CMD_WARNED;
+ printk(KERN_WARNING "scsi: unknown opcode 0x%02x\n", cmd[0]);
+ }
+
+ /* Otherwise fail it with an "Operation not permitted" */
+ return -EPERM;
+}
+
+static int sg_io(struct file *file, request_queue_t *q,
+ struct gendisk *bd_disk, struct sg_io_hdr *hdr)
+{
+ unsigned long start_time;
+ int writing = 0, ret = 0;
+ struct request *rq;
+ struct bio *bio;
+ char sense[SCSI_SENSE_BUFFERSIZE];
+ unsigned char cmd[BLK_MAX_CDB];
+
+ if (hdr->interface_id != 'S')
+ return -EINVAL;
+ if (hdr->cmd_len > BLK_MAX_CDB)
+ return -EINVAL;
+ if (copy_from_user(cmd, hdr->cmdp, hdr->cmd_len))
+ return -EFAULT;
+ if (verify_command(file, cmd))
+ return -EPERM;
+
+ 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_FROM_DEV:
+ case SG_DXFER_TO_DEV:
+ writing = 1;
+ break;
+ case SG_DXFER_FROM_DEV:
+ break;
+ }
+
+ rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
+ if (!rq)
+ return -ENOMEM;
+
+ 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, iov, hdr->iovec_count);
+ kfree(iov);
+ } else if (hdr->dxfer_len)
+ ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
+
+ if (ret)
+ goto out;
+
+ /*
+ * fill in request structure
+ */
+ rq->cmd_len = hdr->cmd_len;
+ memcpy(rq->cmd, cmd, hdr->cmd_len);
+ if (sizeof(rq->cmd) != hdr->cmd_len)
+ memset(rq->cmd + hdr->cmd_len, 0, sizeof(rq->cmd) - hdr->cmd_len);
+
+ memset(sense, 0, sizeof(sense));
+ rq->sense = sense;
+ rq->sense_len = 0;
+
+ rq->flags |= REQ_BLOCK_PC;
+ bio = rq->bio;
+
+ /*
+ * bounce this after holding a reference to the original bio, it's
+ * needed for proper unmapping
+ */
+ if (rq->bio)
+ blk_queue_bounce(q, &rq->bio);
+
+ rq->timeout = (hdr->timeout * HZ) / 1000;
+ if (!rq->timeout)
+ rq->timeout = q->sg_timeout;
+ if (!rq->timeout)
+ rq->timeout = BLK_DEFAULT_TIMEOUT;
+
+ 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);
+
+ /* write to all output members */
+ hdr->status = 0xff & rq->errors;
+ 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->duration = ((jiffies - start_time) * 1000) / HZ;
+ 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;
+ }
+
+ if (blk_rq_unmap_user(bio, hdr->dxfer_len))
+ ret = -EFAULT;
+
+ /* may not have succeeded, but output values written to control
+ * structure (struct sg_io_hdr). */
+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 file *file, struct request_queue *q,
+ struct gendisk *disk, 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 = kmalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
+ if (!buffer)
+ return -ENOMEM;
+
+ memset(buffer, 0, bytes);
+ }
+
+ 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 = verify_command(file, rq->cmd);
+ 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_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->flags |= REQ_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(request_queue_t *q, struct gendisk *bd_disk, int cmd, int data)
+{
+ struct request *rq;
+ int err;
+
+ rq = blk_get_request(q, WRITE, __GFP_WAIT);
+ rq->flags |= REQ_BLOCK_PC;
+ rq->data = NULL;
+ rq->data_len = 0;
+ rq->timeout = BLK_DEFAULT_TIMEOUT;
+ memset(rq->cmd, 0, sizeof(rq->cmd));
+ 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(request_queue_t *q, struct gendisk *bd_disk, int data)
+{
+ return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
+}
+
+int scsi_cmd_ioctl(struct file *file, struct gendisk *bd_disk, unsigned int cmd, void __user *arg)
+{
+ request_queue_t *q;
+ int err;
+
+ q = bd_disk->queue;
+ if (!q)
+ return -ENXIO;
+
+ if (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(file, q, bd_disk, &hdr);
+ 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 = cgc.timeout;
+ hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
+ hdr.cmd_len = sizeof(cgc.cmd);
+
+ err = sg_io(file, q, bd_disk, &hdr);
+ 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(file, q, bd_disk, 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);
git://git.onelab.eu / linux-2.6.git / blobdiff