On Wed, 2010-04-07 at 10:55 -0400, lemons_terry@xxxxxxx wrote: > Hi > > I'm trying to understand one aspect of the SCSI persistent reservation functionality. > SPC-4 mentions the terms 'All Registrants' and 'Registrants Only', and applies these > to both 'Write Exclusive' and 'Exclusive Access'. Nowhere can I find a definition > of what these terms mean. If you would, please point me in the right direction. > Greetings Terry, 'All Registrants' means that the persistent reservation holder is any registstered I_T Nexus (eg: multiple reservation holders) 'Registrants Only' means that the persistent reservation holder is the single registered I_T Nexus that has obtained the reservation via RESERVE, PREEMPT, PREEMPT_AND_ABORT, or via another I_T Nexus with REGISTER_AND_MOVE. (eg: single reservation holder) You can find how this logic works for multi-fabric target mode by grepping '_ALLREG' and '_REGONLY' in TCM code at: http://git.kernel.org/?p=linux/kernel/git/nab/lio-core-2.6.git;a=blob;f=drivers/target/target_core_pr.c Best, --nab -- 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
