On 01/23/2017 07:29 AM, Christoph Hellwig wrote: > +int scsi_cmd_buf_len(struct request *rq) > +{ > + return scsi_req(rq)->cmd_len * 3; > +} > +EXPORT_SYMBOL(scsi_cmd_buf_len); Hello Christoph, Where does the '* 3' come from? I think that deserves a comment. Additionally, this patch introduces a new warning when building with W=1: block/scsi_ioctl.c:761:5: warning: no previous prototype for ‘scsi_cmd_buf_len’ [-Wmissing-prototypes] Please consider adding #include <linux/blktrace_api.h> to the source file in which scsi_cmd_buf_len() is added. Thanks, Bart. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel