Re: 2.4.18 no timestamp update on modified mmapped files

From: Keith Owens (
Date: Tue Jun 11 2002 - 02:07:37 EST

On Mon, 10 Jun 2002 23:49:02 -0700,
Andrew Morton <> wrote:
>Keith Owens wrote:
>> On Mon, 10 Jun 2002 23:17:27 -0700,
>> Andrew Morton <> wrote:
>> > The st_ctime and st_mtime fields of a file that is mapped with MAP_SHARED
>> > and PROT_WRITE shall be marked for update at some point in the interval
>> > between a write reference to the mapped region and the next call to msync() with
>> > MS_ASYNC or MS_SYNC for that portion of the file by any process. If there is
>> > no such call and if the underlying file is modified as a result of a write reference,
>> > then these fields shall be marked for update at some time after the write reference.
>> That says nothing about a file where the only updates are via mmap. My
>> file had grown to its final size so there were no more writes, only
>> pages being dirtied via mmap.
>It is specifically referring to updates via mmap! "a write reference
>to the mapped region". This is the mmap documentation.

I saw "write reference" and my brain translated that to "write()". I
blame the long weekend.

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