320 строки
8.6 KiB
C
320 строки
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Changes:
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br> 08/23/2000
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* - get rid of some verify_areas and use __copy*user and __get/put_user
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* for the ones that remain
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*/
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/interrupt.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/sg.h>
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#include <scsi/scsi_dbg.h>
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#include "scsi_logging.h"
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#define NORMAL_RETRIES 5
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#define IOCTL_NORMAL_TIMEOUT (10 * HZ)
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#define MAX_BUF PAGE_SIZE
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/**
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* ioctl_probe -- return host identification
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* @host: host to identify
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* @buffer: userspace buffer for identification
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*
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* Return an identifying string at @buffer, if @buffer is non-NULL, filling
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* to the length stored at * (int *) @buffer.
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*/
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static int ioctl_probe(struct Scsi_Host *host, void __user *buffer)
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{
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unsigned int len, slen;
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const char *string;
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if (buffer) {
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if (get_user(len, (unsigned int __user *) buffer))
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return -EFAULT;
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if (host->hostt->info)
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string = host->hostt->info(host);
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else
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string = host->hostt->name;
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if (string) {
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slen = strlen(string);
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if (len > slen)
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len = slen + 1;
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if (copy_to_user(buffer, string, len))
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return -EFAULT;
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}
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}
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return 1;
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}
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/*
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* The SCSI_IOCTL_SEND_COMMAND ioctl sends a command out to the SCSI host.
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* The IOCTL_NORMAL_TIMEOUT and NORMAL_RETRIES variables are used.
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*
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* dev is the SCSI device struct ptr, *(int *) arg is the length of the
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* input data, if any, not including the command string & counts,
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* *((int *)arg + 1) is the output buffer size in bytes.
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*
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* *(char *) ((int *) arg)[2] the actual command byte.
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*
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* Note that if more than MAX_BUF bytes are requested to be transferred,
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* the ioctl will fail with error EINVAL.
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*
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* This size *does not* include the initial lengths that were passed.
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*
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* The SCSI command is read from the memory location immediately after the
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* length words, and the input data is right after the command. The SCSI
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* routines know the command size based on the opcode decode.
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*
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* The output area is then filled in starting from the command byte.
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*/
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static int ioctl_internal_command(struct scsi_device *sdev, char *cmd,
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int timeout, int retries)
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{
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int result;
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struct scsi_sense_hdr sshdr;
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SCSI_LOG_IOCTL(1, sdev_printk(KERN_INFO, sdev,
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"Trying ioctl with scsi command %d\n", *cmd));
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result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0,
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&sshdr, timeout, retries, NULL);
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SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev,
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"Ioctl returned 0x%x\n", result));
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if (driver_byte(result) == DRIVER_SENSE &&
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scsi_sense_valid(&sshdr)) {
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switch (sshdr.sense_key) {
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case ILLEGAL_REQUEST:
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if (cmd[0] == ALLOW_MEDIUM_REMOVAL)
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sdev->lockable = 0;
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else
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sdev_printk(KERN_INFO, sdev,
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"ioctl_internal_command: "
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"ILLEGAL REQUEST "
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"asc=0x%x ascq=0x%x\n",
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sshdr.asc, sshdr.ascq);
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break;
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case NOT_READY: /* This happens if there is no disc in drive */
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if (sdev->removable)
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break;
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fallthrough;
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case UNIT_ATTENTION:
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if (sdev->removable) {
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sdev->changed = 1;
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result = 0; /* This is no longer considered an error */
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break;
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}
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fallthrough; /* for non-removable media */
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default:
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sdev_printk(KERN_INFO, sdev,
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"ioctl_internal_command return code = %x\n",
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result);
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scsi_print_sense_hdr(sdev, NULL, &sshdr);
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break;
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}
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}
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SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev,
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"IOCTL Releasing command\n"));
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return result;
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}
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int scsi_set_medium_removal(struct scsi_device *sdev, char state)
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{
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char scsi_cmd[MAX_COMMAND_SIZE];
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int ret;
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if (!sdev->removable || !sdev->lockable)
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return 0;
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scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL;
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scsi_cmd[1] = 0;
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scsi_cmd[2] = 0;
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scsi_cmd[3] = 0;
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scsi_cmd[4] = state;
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scsi_cmd[5] = 0;
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ret = ioctl_internal_command(sdev, scsi_cmd,
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IOCTL_NORMAL_TIMEOUT, NORMAL_RETRIES);
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if (ret == 0)
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sdev->locked = (state == SCSI_REMOVAL_PREVENT);
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return ret;
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}
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EXPORT_SYMBOL(scsi_set_medium_removal);
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/*
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* The scsi_ioctl_get_pci() function places into arg the value
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* pci_dev::slot_name (8 characters) for the PCI device (if any).
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* Returns: 0 on success
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* -ENXIO if there isn't a PCI device pointer
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* (could be because the SCSI driver hasn't been
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* updated yet, or because it isn't a SCSI
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* device)
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* any copy_to_user() error on failure there
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*/
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static int scsi_ioctl_get_pci(struct scsi_device *sdev, void __user *arg)
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{
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struct device *dev = scsi_get_device(sdev->host);
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const char *name;
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if (!dev)
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return -ENXIO;
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name = dev_name(dev);
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/* compatibility with old ioctl which only returned
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* 20 characters */
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return copy_to_user(arg, name, min(strlen(name), (size_t)20))
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? -EFAULT: 0;
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}
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static int scsi_ioctl_common(struct scsi_device *sdev, int cmd, void __user *arg)
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{
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char scsi_cmd[MAX_COMMAND_SIZE];
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struct scsi_sense_hdr sense_hdr;
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/* Check for deprecated ioctls ... all the ioctls which don't
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* follow the new unique numbering scheme are deprecated */
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switch (cmd) {
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case SCSI_IOCTL_SEND_COMMAND:
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case SCSI_IOCTL_TEST_UNIT_READY:
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case SCSI_IOCTL_BENCHMARK_COMMAND:
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case SCSI_IOCTL_SYNC:
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case SCSI_IOCTL_START_UNIT:
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case SCSI_IOCTL_STOP_UNIT:
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printk(KERN_WARNING "program %s is using a deprecated SCSI "
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"ioctl, please convert it to SG_IO\n", current->comm);
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break;
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default:
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break;
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}
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switch (cmd) {
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case SCSI_IOCTL_GET_IDLUN: {
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struct scsi_idlun v = {
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.dev_id = (sdev->id & 0xff)
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+ ((sdev->lun & 0xff) << 8)
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+ ((sdev->channel & 0xff) << 16)
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+ ((sdev->host->host_no & 0xff) << 24),
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.host_unique_id = sdev->host->unique_id
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};
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if (copy_to_user(arg, &v, sizeof(struct scsi_idlun)))
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return -EFAULT;
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return 0;
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}
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case SCSI_IOCTL_GET_BUS_NUMBER:
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return put_user(sdev->host->host_no, (int __user *)arg);
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case SCSI_IOCTL_PROBE_HOST:
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return ioctl_probe(sdev->host, arg);
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case SCSI_IOCTL_SEND_COMMAND:
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if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
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return -EACCES;
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return sg_scsi_ioctl(sdev->request_queue, NULL, 0, arg);
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case SCSI_IOCTL_DOORLOCK:
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return scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
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case SCSI_IOCTL_DOORUNLOCK:
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return scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
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case SCSI_IOCTL_TEST_UNIT_READY:
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return scsi_test_unit_ready(sdev, IOCTL_NORMAL_TIMEOUT,
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NORMAL_RETRIES, &sense_hdr);
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case SCSI_IOCTL_START_UNIT:
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scsi_cmd[0] = START_STOP;
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scsi_cmd[1] = 0;
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scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
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scsi_cmd[4] = 1;
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return ioctl_internal_command(sdev, scsi_cmd,
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START_STOP_TIMEOUT, NORMAL_RETRIES);
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case SCSI_IOCTL_STOP_UNIT:
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scsi_cmd[0] = START_STOP;
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scsi_cmd[1] = 0;
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scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
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scsi_cmd[4] = 0;
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return ioctl_internal_command(sdev, scsi_cmd,
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START_STOP_TIMEOUT, NORMAL_RETRIES);
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case SCSI_IOCTL_GET_PCI:
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return scsi_ioctl_get_pci(sdev, arg);
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case SG_SCSI_RESET:
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return scsi_ioctl_reset(sdev, arg);
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}
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return -ENOIOCTLCMD;
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}
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/**
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* scsi_ioctl - Dispatch ioctl to scsi device
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* @sdev: scsi device receiving ioctl
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* @cmd: which ioctl is it
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* @arg: data associated with ioctl
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*
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* Description: The scsi_ioctl() function differs from most ioctls in that it
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* does not take a major/minor number as the dev field. Rather, it takes
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* a pointer to a &struct scsi_device.
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*/
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int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
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{
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int ret = scsi_ioctl_common(sdev, cmd, arg);
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if (ret != -ENOIOCTLCMD)
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return ret;
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if (sdev->host->hostt->ioctl)
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return sdev->host->hostt->ioctl(sdev, cmd, arg);
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return -EINVAL;
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}
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EXPORT_SYMBOL(scsi_ioctl);
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#ifdef CONFIG_COMPAT
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int scsi_compat_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
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{
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int ret = scsi_ioctl_common(sdev, cmd, arg);
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if (ret != -ENOIOCTLCMD)
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return ret;
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if (sdev->host->hostt->compat_ioctl)
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return sdev->host->hostt->compat_ioctl(sdev, cmd, arg);
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return ret;
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}
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EXPORT_SYMBOL(scsi_compat_ioctl);
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#endif
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/*
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* We can process a reset even when a device isn't fully operable.
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*/
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int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev, int cmd,
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bool ndelay)
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{
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if (cmd == SG_SCSI_RESET && ndelay) {
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if (scsi_host_in_recovery(sdev->host))
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return -EAGAIN;
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} else {
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if (!scsi_block_when_processing_errors(sdev))
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return -ENODEV;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(scsi_ioctl_block_when_processing_errors);
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