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...
ps
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