On Thu, 1 Mar 2012, Lee Duncan wrote: > The st tape driver recently added the MTWEOFI ioctl, which writes > a tape filemark (EOF), like the MTWEOF ioctl, except that MTWEOFI > returns immediately. This makes certain applications, like backup > software, run much more quickly on buffered tape drives. > > Since legacy applications do not know about this new MTWEOFI ioctl, > this patch adds a new ioctl option that tells the st driver to return > immediately when writing an EOF (i.e. a filemark). This new flag > is much like the existing flag that tells the st driver to perform > writes (and certain other IOs) immediately, but this new flag only > applies to writing EOFs. > > This new feature is controlled via the MTSETDRVBUFFER ioctl, using > the newly-defined MT_ST_NOWAIT_EOF flag. > > Use of this new feature is displayed via the sysfs tape "options" > attribute. > > The st documentation was updated to mention this new flag, as well > as the problems that can occur from using it. > > Signed-off-by: Lee Duncan <lduncan@xxxxxxxx> Acked-by: Kai Makisara <kai.makisara@xxxxxxxxxxx> > --- > Documentation/scsi/st.txt | 4 ++++ > drivers/scsi/st.c | 21 ++++++++++++++++++--- > drivers/scsi/st.h | 1 + > include/linux/mtio.h | 1 + > 4 files changed, 24 insertions(+), 3 deletions(-) Thanks, Kai -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
