Hello. The ServeRAID driver, or ips(4), seems to distinguish read or write requests with a macro called ips_read_request(), which is defined as
#define ips_read_request(iobuf) ((iobuf)->bio_cmd == BIO_READ) in its strategy routine and a few other places. So when the request is BIO_FLUSH, the ips driver issues a write command (IPS_WRITE_CMD) with length == 0, right? My question is, do ServeRAID controllers treat 0-byte write command as a sync-to-disk request, or is there any command for that purpose? There's a command called IPS_CACHE_FLUSH_CMD defined in ipsreg.h, but it's not used anywhere in the normal code path. Best regards, YONETANI Tomokazu. _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
