scsi: replace the fmode_t argument to scsi_ioctl with a simple bool

Instead of passing a fmode_t and only checking it for FMODE_WRITE, pass
a bool open_for_write to prepare for callers that won't have the fmode_t.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Link: https://lore.kernel.org/r/20230608110258.189493-20-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/scsi/ch.c

@@ -877,7 +877,8 @@ static long ch_ioctl(struct file *file,
 	}
 
 	default:
-		return scsi_ioctl(ch->device, file->f_mode, cmd, argp);
+		return scsi_ioctl(ch->device, file->f_mode & FMODE_WRITE, cmd,
+				  argp);
 
 	}
 }

drivers/scsi/scsi_ioctl.c

@@ -346,7 +346,7 @@ bool scsi_cmd_allowed(unsigned char *cmd, bool open_for_write)
 EXPORT_SYMBOL(scsi_cmd_allowed);
 
 static int scsi_fill_sghdr_rq(struct scsi_device *sdev, struct request *rq,
-		struct sg_io_hdr *hdr, fmode_t mode)
+		struct sg_io_hdr *hdr, bool open_for_write)
 {
 	struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
 
@@ -354,7 +354,7 @@ static int scsi_fill_sghdr_rq(struct scsi_device *sdev, struct request *rq,
 		return -EMSGSIZE;
 	if (copy_from_user(scmd->cmnd, hdr->cmdp, hdr->cmd_len))
 		return -EFAULT;
-	if (!scsi_cmd_allowed(scmd->cmnd, mode & FMODE_WRITE))
+	if (!scsi_cmd_allowed(scmd->cmnd, open_for_write))
 		return -EPERM;
 	scmd->cmd_len = hdr->cmd_len;
 
@@ -407,7 +407,8 @@ static int scsi_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 	return ret;
 }
 
-static int sg_io(struct scsi_device *sdev, struct sg_io_hdr *hdr, fmode_t mode)
+static int sg_io(struct scsi_device *sdev, struct sg_io_hdr *hdr,
+		bool open_for_write)
 {
 	unsigned long start_time;
 	ssize_t ret = 0;
@@ -448,7 +449,7 @@ static int sg_io(struct scsi_device *sdev, struct sg_io_hdr *hdr, fmode_t mode)
 		goto out_put_request;
 	}
 
-	ret = scsi_fill_sghdr_rq(sdev, rq, hdr, mode);
+	ret = scsi_fill_sghdr_rq(sdev, rq, hdr, open_for_write);
 	if (ret < 0)
 		goto out_put_request;
 
@@ -477,8 +478,7 @@ static int sg_io(struct scsi_device *sdev, struct sg_io_hdr *hdr, fmode_t mode)
 /**
  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
  * @q:		request queue to send scsi commands down
- * @mode:	mode used to open the file through which the ioctl has been
- *		submitted
+ * @open_for_write: is the file / block device opened for writing?
  * @sic:	userspace structure describing the command to perform
  *
  * Send down the scsi command described by @sic to the device below
@@ -501,7 +501,7 @@ static int sg_io(struct scsi_device *sdev, struct sg_io_hdr *hdr, fmode_t mode)
  *      Positive numbers returned are the compacted SCSI error codes (4
  *      bytes in one int) where the lowest byte is the SCSI status.
  */
-static int sg_scsi_ioctl(struct request_queue *q, fmode_t mode,
+static int sg_scsi_ioctl(struct request_queue *q, bool open_for_write,
 		struct scsi_ioctl_command __user *sic)
 {
 	struct request *rq;
@@ -554,7 +554,7 @@ static int sg_scsi_ioctl(struct request_queue *q, fmode_t mode,
 		goto error;
 
 	err = -EPERM;
-	if (!scsi_cmd_allowed(scmd->cmnd, mode & FMODE_WRITE))
+	if (!scsi_cmd_allowed(scmd->cmnd, open_for_write))
 		goto error;
 
 	/* default.  possible overridden later */
@@ -776,7 +776,7 @@ static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc,
 	return 0;
 }
 
-static int scsi_cdrom_send_packet(struct scsi_device *sdev, fmode_t mode,
+static int scsi_cdrom_send_packet(struct scsi_device *sdev, bool open_for_write,
 		void __user *arg)
 {
 	struct cdrom_generic_command cgc;
@@ -817,7 +817,7 @@ static int scsi_cdrom_send_packet(struct scsi_device *sdev, fmode_t mode,
 	hdr.cmdp = ((struct cdrom_generic_command __user *) arg)->cmd;
 	hdr.cmd_len = sizeof(cgc.cmd);
 
-	err = sg_io(sdev, &hdr, mode);
+	err = sg_io(sdev, &hdr, open_for_write);
 	if (err == -EFAULT)
 		return -EFAULT;
 
@@ -832,7 +832,7 @@ static int scsi_cdrom_send_packet(struct scsi_device *sdev, fmode_t mode,
 	return err;
 }
 
-static int scsi_ioctl_sg_io(struct scsi_device *sdev, fmode_t mode,
+static int scsi_ioctl_sg_io(struct scsi_device *sdev, bool open_for_write,
 		void __user *argp)
 {
 	struct sg_io_hdr hdr;
@@ -841,7 +841,7 @@ static int scsi_ioctl_sg_io(struct scsi_device *sdev, fmode_t mode,
 	error = get_sg_io_hdr(&hdr, argp);
 	if (error)
 		return error;
-	error = sg_io(sdev, &hdr, mode);
+	error = sg_io(sdev, &hdr, open_for_write);
 	if (error == -EFAULT)
 		return error;
 	if (put_sg_io_hdr(&hdr, argp))
@@ -852,7 +852,7 @@ static int scsi_ioctl_sg_io(struct scsi_device *sdev, fmode_t mode,
 /**
  * scsi_ioctl - Dispatch ioctl to scsi device
  * @sdev: scsi device receiving ioctl
- * @mode: mode the block/char device is opened with
+ * @open_for_write: is the file / block device opened for writing?
  * @cmd: which ioctl is it
  * @arg: data associated with ioctl
  *
@@ -860,7 +860,7 @@ static int scsi_ioctl_sg_io(struct scsi_device *sdev, fmode_t mode,
  * does not take a major/minor number as the dev field.  Rather, it takes
  * a pointer to a &struct scsi_device.
  */
-int scsi_ioctl(struct scsi_device *sdev, fmode_t mode, int cmd,
+int scsi_ioctl(struct scsi_device *sdev, bool open_for_write, int cmd,
 		void __user *arg)
 {
 	struct request_queue *q = sdev->request_queue;
@@ -896,11 +896,11 @@ int scsi_ioctl(struct scsi_device *sdev, fmode_t mode, int cmd,
 	case SG_EMULATED_HOST:
 		return sg_emulated_host(q, arg);
 	case SG_IO:
-		return scsi_ioctl_sg_io(sdev, mode, arg);
+		return scsi_ioctl_sg_io(sdev, open_for_write, arg);
 	case SCSI_IOCTL_SEND_COMMAND:
-		return sg_scsi_ioctl(q, mode, arg);
+		return sg_scsi_ioctl(q, open_for_write, arg);
 	case CDROM_SEND_PACKET:
-		return scsi_cdrom_send_packet(sdev, mode, arg);
+		return scsi_cdrom_send_packet(sdev, open_for_write, arg);
 	case CDROMCLOSETRAY:
 		return scsi_send_start_stop(sdev, 3);
 	case CDROMEJECT:

drivers/scsi/sd.c

@@ -1463,7 +1463,7 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
 
 	if (is_sed_ioctl(cmd))
 		return sed_ioctl(sdkp->opal_dev, cmd, p);
-	return scsi_ioctl(sdp, mode, cmd, p);
+	return scsi_ioctl(sdp, mode & FMODE_WRITE, cmd, p);
 }
 
 static void set_media_not_present(struct scsi_disk *sdkp)

drivers/scsi/sg.c

@@ -1103,7 +1103,8 @@ sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd *sfp,
 	case SCSI_IOCTL_SEND_COMMAND:
 		if (atomic_read(&sdp->detaching))
 			return -ENODEV;
-		return scsi_ioctl(sdp->device, filp->f_mode, cmd_in, p);
+		return scsi_ioctl(sdp->device, filp->f_mode & FMODE_WRITE,
+				  cmd_in, p);
 	case SG_SET_DEBUG:
 		result = get_user(val, ip);
 		if (result)
@@ -1159,7 +1160,7 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
 	ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p);
 	if (ret != -ENOIOCTLCMD)
 		return ret;
-	return scsi_ioctl(sdp->device, filp->f_mode, cmd_in, p);
+	return scsi_ioctl(sdp->device, filp->f_mode & FMODE_WRITE, cmd_in, p);
 }
 
 static __poll_t

drivers/scsi/sr.c

@@ -543,7 +543,7 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 		if (ret != -ENOSYS)
 			goto put;
 	}
-	ret = scsi_ioctl(sdev, mode, cmd, argp);
+	ret = scsi_ioctl(sdev, mode & FMODE_WRITE, cmd, argp);
 
 put:
 	scsi_autopm_put_device(sdev);

drivers/scsi/st.c

@@ -3832,7 +3832,7 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg)
 		break;
 	}
 
-	retval = scsi_ioctl(STp->device, file->f_mode, cmd_in, p);
+	retval = scsi_ioctl(STp->device, file->f_mode & FMODE_WRITE, cmd_in, p);
 	if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) {
 		/* unload */
 		STp->rew_at_close = 0;

include/scsi/scsi_ioctl.h

@@ -45,7 +45,7 @@ typedef struct scsi_fctargaddress {
 
 int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev,
 		int cmd, bool ndelay);
-int scsi_ioctl(struct scsi_device *sdev, fmode_t mode, int cmd,
+int scsi_ioctl(struct scsi_device *sdev, bool open_for_write, int cmd,
 		void __user *arg);
 int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp);
 int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp);