Messages in this thread | | | Date | Wed, 28 Feb 2007 16:09:29 -0500 | From | Peter Staubach <> | Subject | Re: [patch 01/22] update ctime and mtime for mmaped write |
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Miklos Szeredi wrote: >> What happens if the application overwrites what it had written some >> time later? Nothing. The page is already read-write, the pte dirty, >> so even though the file was clearly modified, there's absolutely no >> way in which this can be used to force an update to the timestamp. >> > > Which, I realize now, actually means, that the patch is wrong. Msync > will have to write protect the page table entries, so that later > dirtyings may have an effect on the timestamp.
I thought that PeterZ's changes were to write-protect the page after cleaning it so that future modifications could be detected and tracked accordingly? Does the right thing not happen already?
Thanx...
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