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SubjectRe: file changes without updating mtime
On Tue 2006-06-27 13:10:10, Erik Paulson wrote:
>
> Hello -
>
> I'm seeing file content change without a change to the mtime for that
> file, and I'm trying to understand why.
>
> The filesystem is ext3, on a local IDE drive. It's a Centos 4.3 machine,
> with kernel version: 2.6.9-34.0.1.ELsmp
>
> A shell script that in a loop prints the date, stats the file, and then runs
> 'md5sum' gave me this output:
>
> Fri Jun 23 04:03:24 CDT 2006
> File: `/var/lib/rpm/__db.001'
> Size: 16384 Blocks: 32 IO Block: 4096 regular file
> Device: 303h/771d Inode: 6291609 Links: 1
> Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
> Access: 2006-06-23 04:00:24.669054993 -0500
> Modify: 2006-06-18 21:42:43.685708137 -0500
> Change: 2006-06-18 21:42:43.685708137 -0500
> 37327d016d9741b0d74e4c9bd14d2956 /var/lib/rpm/__db.001
>
>
> Fri Jun 23 04:06:24 CDT 2006
> File: `/var/lib/rpm/__db.001'
> Size: 16384 Blocks: 32 IO Block: 4096 regular file
> Device: 303h/771d Inode: 6291609 Links: 1
> Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
> Access: 2006-06-23 04:04:51.898420485 -0500
> Modify: 2006-06-18 21:42:43.685708137 -0500
> Change: 2006-06-18 21:42:43.685708137 -0500
> b2b25d452c94bb376f172e1789e8ab6e /var/lib/rpm/__db.001
>
>
> So something else read the file at 4:04:51, and apparently changed
> it.

I believe it is / was possible to change file using mmap without
affecting mtime. It might have been fixed in the meantime.

Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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