scsi: replace the fmode_t argument to scsi_cmd_allowed 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/20230608110258.189493-19-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/scsi/scsi_bsg.c

@@ -42,7 +42,7 @@ static int scsi_bsg_sg_io_fn(struct request_queue *q, struct sg_io_v4 *hdr,
 	if (copy_from_user(scmd->cmnd, uptr64(hdr->request), scmd->cmd_len))
 		goto out_put_request;
 	ret = -EPERM;
-	if (!scsi_cmd_allowed(scmd->cmnd, mode))
+	if (!scsi_cmd_allowed(scmd->cmnd, mode & FMODE_WRITE))
 		goto out_put_request;
 
 	ret = 0;

drivers/scsi/scsi_ioctl.c

@@ -248,7 +248,7 @@ static int scsi_send_start_stop(struct scsi_device *sdev, int data)
  * Only a subset of commands are allowed for unprivileged users. Commands used
  * to format the media, update the firmware, etc. are not permitted.
  */
-bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode)
+bool scsi_cmd_allowed(unsigned char *cmd, bool open_for_write)
 {
 	/* root can do any command. */
 	if (capable(CAP_SYS_RAWIO))
@@ -338,7 +338,7 @@ bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode)
 	case GPCMD_SET_READ_AHEAD:
 	/* ZBC */
 	case ZBC_OUT:
-		return (mode & FMODE_WRITE);
+		return open_for_write;
 	default:
 		return false;
 	}
@@ -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))
+	if (!scsi_cmd_allowed(scmd->cmnd, mode & FMODE_WRITE))
 		return -EPERM;
 	scmd->cmd_len = hdr->cmd_len;
 
@@ -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))
+	if (!scsi_cmd_allowed(scmd->cmnd, mode & FMODE_WRITE))
 		goto error;
 
 	/* default.  possible overridden later */

drivers/scsi/sg.c

@@ -237,7 +237,7 @@ static int sg_allow_access(struct file *filp, unsigned char *cmd)
 
 	if (sfp->parentdp->device->type == TYPE_SCANNER)
 		return 0;
-	if (!scsi_cmd_allowed(cmd, filp->f_mode))
+	if (!scsi_cmd_allowed(cmd, filp->f_mode & FMODE_WRITE))
 		return -EPERM;
 	return 0;
 }

include/scsi/scsi_ioctl.h

@@ -49,7 +49,7 @@ int scsi_ioctl(struct scsi_device *sdev, fmode_t mode, 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);
-bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode);
+bool scsi_cmd_allowed(unsigned char *cmd, bool open_for_write);
 
 #endif /* __KERNEL__ */
 #endif /* _SCSI_IOCTL_H */