> O_NOATIME only works if the kernel is 2.6.8 or above. Wouldn't it make
> sense to try again opening the file without that flag if the first
> open() fails?
It is my understanding that the flag is silently ignored on earlier
kernels.
However, according to the manual page,
EPERM The O_NOATIME flag was specified, but the effective user ID of
the caller did not match the owner of the file and the caller
was not privileged (CAP_FOWNER).
so it may be useful to retry anyway to deal with weird configs.
Juliusz
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