Messages in this thread | | | From | Brian Pawlowski <> | Subject | Re: ext3 and SPEC SFS Run rules. | Date | Mon, 26 Jul 2004 16:45:55 -0700 (PDT) |
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> The only place that I am aware of where we *do*not* return wcc data is > for the WRITE request (which you have not listed). As the underlying > filesystem is left to do whatever locking it thinks is appropriate, > and vfs_write does none, nfsd is not in a position to lock it itself > against sys_write and so cannot record before and after stat > information that is atomic w.r.t the update.
Without replaying conversations on V3 and wcc_ stuff I do believe that long about 1993 or 1994 most decided that making the pre- and post-stat info atomic w.r.t. the update was not "required" - because that would be hard.
The WCC stuff is relegated to a hint to help detect conflicting changes in that case I believe.
beepy
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