Messages in this thread | | | Date | Fri, 31 Oct 2014 11:57:38 +0100 | From | Richard Weinberger <> | Subject | Re: [PATCH] UBI: vtbl: Use ubi_eba_atomic_leb_change() |
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Am 31.10.2014 um 11:45 schrieb hujianyang: > This question is basing on your comment for this patch: > > """ > we can guarantee that the first VTBL record is always > correct and we don't really need the second one anymore. > """ > > I think that means one PEB is enough in your considering. > So I want to know if you are sure about this. Because > we use two leb for master_node in ubifs-level. So maybe > VTBL is like super_node, not master_node, right?
Yes, technically one PEB is enough if atomic leb change is used. But existing UBI implementations want a second one and a backup VTBL PEB is good for robustness. i.e. if the PEB turns bad we have a backup and do not lose all volume meta information.
Thanks, //richard
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