On Tue, Nov 18 2003, Patrick Mansfield wrote: > On Tue, Nov 18, 2003 at 10:20:17AM -0500, Alan Stern wrote: > > > Alignment to a 512-byte boundary would suffice and page alignment would be > > more than enough. The cleanest way to fix the problem would be to have st > > and sg refuse to do direct I/O when the user's buffer isn't page aligned. > > That's probably too draconian (but it would allow us to give the user > > process an appropriate error code right away). > > The above restriction sounds reasonable to me, but I do not have > experience in this area. I thought that the raw and direct block > interfaces already had such restrictions. > > Jens or Doug G can you comment on this? > > You could add a scsi_host fields or bits specifying alignment > restrictions, and enforce them as needed in upper level drivers.
The queue already has such a restriction embedded, see bio_map_user() and queue_dma_alignment(). -- Jens Axboe ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
