Re: [RFC] set MS_NOATIME on FAT ?

[Werner Almesberger <werner@almesberger.net>]

OGAWA Hirofumi wrote:
> Looks good to me. But, I don't know whether actually DOS updates ->adate
> or not. It would depend on it.

According to http://home.no.net/tkos/info/fat.html, it's a new
addition with VFAT. Wikipedia (http://en.wikipedia.org/wiki/VFAT)
doesn't say anything, but seems in general relatively silent about
FAT versions in the description of the directory entries.

There might also be useful information in the FAT specification at
http://www.microsoft.com/whdc/system/platform/firmware/fatgen.mspx
but it seems to me that you'll need to have your IP laywers go over
their very weird download license a few time before you can know if
it's dangerous to read or not :-(

In any case, adate clearly didn't exist in older DOS versions, so
there are cases where you don't want to touch adate. An in all these,
it should always be correct to set noatime.

Thanks,
- Werner

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