add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/scsi/scsi_ioctl.c
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@@ -1,3 +1,4 @@
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+// 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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@@ -116,14 +117,14 @@
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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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+			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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+			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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@@ -188,17 +189,7 @@
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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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+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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@@ -220,18 +211,18 @@
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 	}
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 	switch (cmd) {
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-	case SCSI_IOCTL_GET_IDLUN:
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-		if (!access_ok(VERIFY_WRITE, arg, sizeof(struct scsi_idlun)))
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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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-
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-		__put_user((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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-			 &((struct scsi_idlun __user *)arg)->dev_id);
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-		__put_user(sdev->host->unique_id,
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-			 &((struct scsi_idlun __user *)arg)->host_unique_id);
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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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@@ -265,14 +256,50 @@
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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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-	default:
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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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 	}
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+	return -ENOIOCTLCMD;
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+}
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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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+
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+	if (ret != -ENOIOCTLCMD)
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+		return ret;
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+
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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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+
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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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+
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+	if (ret != -ENOIOCTLCMD)
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+		return ret;
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+
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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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+
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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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 /*
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  * We can process a reset even when a device isn't fully operable.
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  */