From: =?windows-1252?Q?J=F6rg-Volker_Peetz?= <jvpeetz@web.de>
Subject: Re: ext4 lazytime: ctime of some files changed
Date: Sat, 23 May 2015 15:24:15 +0200
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References: <55531AE3.7030704@web.de> <mivtkj$fhi$1@ger.gmane.org> <20150514222044.GA3901@thunk.org> <55560D42.2060402@web.de> <20150515231107.GF3901@thunk.org> <555C4A65.5030100@web.de>
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Cc: Theodore Ts'o <tytso@mit.edu>
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J=F6rg-Volker Peetz wrote on 05/20/2015 10:48:
<snip>
> after a few days of running the patch, I seem to have again two files=
 with
> changed mtime without touching them (only reading by rsync).
>=20
<snip>
I can affirm this error, but am not sure where to hunt.
I'm using several USB drives in a cycle for backup.
I have a directory with a file originally older than a few years.
Mount options are

$ grep sda /proc/mounts
/dev/sda2 /home ext4 rw,lazytime,relatime,nobarrier,errors=3Dremount-ro=
 0 0

(using lazytime with relatime).
As reported, while I started using lazytime, this file's mtime got chan=
ged.
I reset the mtime with the "touch -r <intact_copy> <file>" command.
After a backup to one of the USB drives with something like

$ rsync -acv --exclude-from=3D<file> --delete-excluded <SRC> <DEST_ON_U=
SB_DRIVE>

the namely file had its mtime changed  on the *source* device (the USB =
drive has
an ext4 fs mounted without the lazytime option).
I reset that again on the source SSD using "touch". Another file in the=
 same was
also modified.

Next backup on another USB drive, same thing.
I took a look into the file list on the backup medium before the backup=
=2E
There the file also had a different mtime, but not the same mtime the f=
ile got
after the backup.

I'm confused.
Any idea?
--=20
Regards,
J=F6rg.


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