[gpfsug-discuss] immutable file in an immutable folder can be touched

Haizhu Liu haizhu at us.ibm.com
Tue Mar 29 14:49:54 BST 2022 

Yes, that’s correct. Atime, mtime and ctime can be changed, in addition, if the file is under an immutable fileset, mtime and ctime can be changed, atime is overloaded with expiration time.

From: <hupancha at in.ibm.com> on behalf of "scale at us.ibm.com" <scale at us.ibm.com>
Date: Tuesday, March 29, 2022 at 8:57 AM
To: gpfsug main discussion list <gpfsug-discuss at gpfsug.org>
Cc: gpfsug-discuss <gpfsug-discuss-bounces at gpfsug.org>, "juergen.hannappel at desy.de" <juergen.hannappel at desy.de>, "p.ward at nhm.ac.uk" <p.ward at nhm.ac.uk>, Haizhu Liu <haizhu at us.ibm.com>
Subject: Re: [EXTERNAL] Re: [gpfsug-discuss] immutable file in an immutable folder can be touched


From design docs can see that Spectrum scale allows changing of timestamps for immutable files.
+ Haizhu to confirm this as well.

Regards, The Spectrum Scale (GPFS) team

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[Inactive hide details for "Paul Ward" ---28-03-2022 06.56.04 PM---Hi Jürgen, We noticed this behaviour when we were trying to t]"Paul Ward" ---28-03-2022 06.56.04 PM---Hi Jürgen, We noticed this behaviour when we were trying to test immutability on our newly installed

From: "Paul Ward" <p.ward at nhm.ac.uk>
To: "gpfsug main discussion list" <gpfsug-discuss at gpfsug.org>
Date: 28-03-2022 06.56 PM
Subject: [EXTERNAL] Re: [gpfsug-discuss] immutable file in an immutable folder can be touched
Sent by: "gpfsug-discuss" <gpfsug-discuss-bounces at gpfsug.org>

________________________________



Hi Jürgen,

We noticed this behaviour when we were trying to test immutability on our newly installed solution.
We tried using touch with a date in the past to test the expiry date.
We noticed although touch changed the timestamp, it didn't change wherever the policy engine checked.

We found a work around for our testing, so I think we accepted it as a 'feature'.
I can't find a support ticket, so I am assuming we didn't report it.


Kindest regards,
Paul

Paul Ward
TS Infrastructure Architect
Natural History Museum
T: 02079426450
E: p.ward at nhm.ac.uk


-----Original Message-----
From: gpfsug-discuss <gpfsug-discuss-bounces at gpfsug.org> On Behalf Of Hannappel, Juergen
Sent: 28 March 2022 13:25
To: gpfsug-discuss <gpfsug-discuss at gpfsug.org>
Subject: Re: [gpfsug-discuss] immutable file in an immutable folder can be touched

... if I try a similar action e.g on ext4 where I can use the posix way with ioctl(fd, FS_IOC_GETFLAGS, &flags) flags |= FS_IMMUTABLE_FL; ioctl(fd, FS_IOC_SETFLAGS, &flags)

the touch fails and the mtime remains unchanged....

----- Original Message -----
> From: "Juergen Hannappel" <juergen.hannappel at desy.de>
> To: "gpfsug main discussion list" <gpfsug-discuss at spectrumscale.org>
> Sent: Monday, 28 March, 2022 11:50:50
> Subject: [gpfsug-discuss] immutable file in an immutable folder can be
> touched

> Hi,
> I have an immutable file in an immutable folder:
>
> mmchattr -i yes mutabilityTest/file
> mmchattr -i yes mutabilityTest
> ls -la mutabilityTest
> total 18
> drwxr-xr-x 2 hannappj it 4096 Mar 28 11:45 .
> drwxr-xr-x 7 hannappj it 8192 Mar 28 11:45 ..
> -rw-r--r-- 1 hannappj it   30 Mar 28 11:45 file
>
> mmlsattr -L mutabilityTest mutabilityTest/file | grep immu
> immutable:            yes
> immutable:            yes
>
>
> Now i do a touch:
> touch mutabilityTest/file
>
> no error, and the modification time is changed:
> ls -la mutabilityTest
> total 18
> drwxr-xr-x 2 hannappj it 4096 Mar 28 11:45 .
> drwxr-xr-x 7 hannappj it 8192 Mar 28 11:45 ..
> -rw-r--r-- 1 hannappj it   30 Mar 28 11:46 file
>
> stat mutabilityTest/file
>  File: 'mutabilityTest/file'
>  Size: 30         Blocks: 2          IO Block: 4194304 regular file
> Device: 2eh/46d Inode: 112989      Links: 1
> Access: (0644/-rw-r--r--)  Uid: (28851/hannappj)   Gid: ( 1000/      it)
> Access: 2022-03-28 11:46:28.454807982 +0200
> Modify: 2022-03-28 11:46:28.454807982 +0200
> Change: 2022-03-28 11:46:28.454807982 +0200
>
>
> Shouldn't the immutability of the file include its change time?
>
>
>
> --
> Dr. Jürgen Hannappel  DESY/IT    Tel.  : +49 40 8998-4616
>
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