On Wed, 2014-06-04 at 10:58 -0400, Douglas Gilbert wrote: > When the SG_IO ioctl was copied into the block layer and > later into the bsg driver, subtle differences emerged. > > One difference is the way injected commands are queued through > the block layer (i.e. this is not SCSI device queueing nor SATA > NCQ). Summarizing: > - SG_IO in the block layer: blk_exec*(at_head=false) > - sg SG_IO: at_head=true > - bsg SG_IO: at_head=true > > Some time ago Boaz Harrosh introduced a sg v4 flag called > BSG_FLAG_Q_AT_TAIL to override the bsg driver default. > This patch does the equivalent for the sg driver. > > > ChangeLog: > Introduce SG_FLAG_Q_AT_TAIL flag to cause commands > to be injected into the block layer with > at_head=false. > > Changes since v1: > Make guard condition (only take sg v3 interface or later > invocations) clearer. > > Signed-off-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> Looks good. Reviewed-by: Ewan D. Milne <emilne@xxxxxxxxxx> -- 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
