In message <[EMAIL PROTECTED]>, Eno Thereska writes:
> >>in /sys/cam/scsi/scsi_da.c the dastrategy() > >>function takes as an argument "struct bio* bp" > >>Now I need to get to the "struct *buf" that bp > >>belongs to. > > >You can't do that, there may not be any struct buf. > >How can a bio exist on it's own, unrelated to any buf? >Would that be a special case or does that happen all the >time? A concrete example would help. struct buf represents a block in the cache/VM system. struct bio represents a disk I/O request. For historical reasons, a buf contains a bio, but that is by no means the only way to create a bio. Throughout geom bio's are created a destroyed which have no relation to any specific buf, for instance to read the key sectors in gbde. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
