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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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