Messages in this thread |  | | | Subject | Re: (fwd) Re: [RFC] mount flag "direct" | | From | Xavier Bestel <> | | Date | 04 Sep 2002 00:52:58 +0200 |
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Le mer 04/09/2002 à 00:42, Peter T. Breuer a écrit :
> Let's maintain a single bit in the superblock that says whether any > directory structure or whatever else we're worried about has been > altered (ecch, well, it has to be a timestamp, never mind ..). Before > every read we check this "bit" ondisk. If it's not set, we happily dive > for our data where we expect to find it. Otherwise we go through the > rigmarole you describe.
Won't work. You would need an atomic read-and-write operation for that (read previous timestamp and write a special timestamp meaning "currently writing this block"), and you don't have that.
Xav
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