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- From: Ulrich Kuehn <kuehn@GOEDEL.UNI-MUENSTER.DE>
- Subject: RE: XATTR structure for biosfs entries
- Date: Wed, 10 Nov 1993 10:45:32 +0100
-
- Hello,
-
- Torsten Scherer writes:
-
- |> As the subject line says, I want to bring the topic of each "file"
- |> in the bios device directory /dev having ownership, filemodes and
- |> c/m/a-time fields, say, a complete XATTR structure, "on stage".
- |> [...]
- |> The problem is how to change mtime/atime for these drivers? Obviously
- |> the change is best made in the read/write calls, but the biosfs can't
- |> do it since it's not touched when an extra device driver does I/O. On
- |> the other hand side the device driver has only _direct_ access to the
- |> filepointer...
- |>
-
- I think the best way to do it would be a new Dcntl on /dev which allows
- the device driver to query the address of its supporting structure in
- the kernel memory. As the device driver run in the kernel's address space,
- there would be no problem with that. It would be backward compatible with
- older device drivers, they simply dont set the values as they dont know
- about it.
- And it should be fairly straight forward to do without messing with some
- dev or index members in some structures.
-
- Regards,
- Ulrich
-
- --
-
- +---------------+----------------------------+-----------------------+
- | Ulrich Kuehn | Internet: | Life is uncertain -- |
- | Cand.Math.Inf | kuehn@math.uni-muenster.de | eat the dessert first |
- +---------------+----------------------------+-----------------------+
-