New subject: [ceph-users] Re: Unexpected behavior of directory mtime after being set explicitly

25 May 2023

      Hi Chris,

Kindly request you that follow steps given in previous mail and paste the output here.

The reason behind this request is that we have encountered an issue which is easily reproducible on
Latest version of both quincy and pacific, also we have thoroughly investigated the matter and we are certain that
No other factors are at play in this scenario.

Note :  We have used Debian 11 for testing.
sdsadmin@ceph-pacific-1:~$ uname -a
Linux ceph-pacific-1 5.10.0-10-amd64 #1 SMP Debian 5.10.84-1 (2021-12-08) x86_64 GNU/Linux
sdsadmin@ceph-pacific-1:~$ sudo ceph -v
ceph version 16.2.13 (5378749ba6be3a0868b51803968ee9cde4833a3e) pacific (stable)

Thanks for your prompt reply.

      Regards
   Sandip Divekar

-----Original Message-----
From: Chris Palmer <chris.palmer@idnet.com> 
Sent: Thursday, May 25, 2023 7:25 PM
To: ceph-users@ceph.io
Subject: [ceph-users] Re: Unexpected behavior of directory mtime after being set explicitly

***** EXTERNAL EMAIL *****

Hi Milind
I just tried this using the ceph kernel client and ceph-common 17.2.6 package in the latest Fedora kernel, against Ceph 17.2.6 and it worked perfectly...
There must be some other factor in play.
Chris

On 25/05/2023 13:04, Sandip Divekar wrote:
...
Hello Milind,
We are using Ceph Kernel Client.
But we found this same behavior while using Libcephfs library.
Should we treat this as a bug?  Or
Is there any existing bug for similar issue ?
Thanks and Regards,
   Sandip Divekar
From: Milind Changire <mchangir@redhat.com>
Sent: Thursday, May 25, 2023 4:24 PM
To: Sandip Divekar <sandip.divekar@hitachivantara.com>
Cc: ceph-users@ceph.io; dev@ceph.io
Subject: Re: [ceph-users] Unexpected behavior of directory mtime after 
being set explicitly
***** EXTERNAL EMAIL *****
Sandip,
What type of client are you using ?
kernel client or fuse client ?
If it's the kernel client, then it's a bug.
FYI - Pacific and Quincy fuse clients do the right thing
On Wed, May 24, 2023 at 9:24 PM Sandip Divekar <sandip.divekar@hitachivantara.com<mailto:sandip.divekar@hitachivantara.com>> wrote:
Hi Team,
I'm writing to bring to your attention an issue we have encountered with the "mtime" (modification time) behavior for directories in the Ceph filesystem.
Upon observation, we have noticed that when the mtime of a directory 
(let's say: dir1) is explicitly changed in CephFS, subsequent additions of files or directories within 'dir1' fail to update the directory's mtime as expected.
This behavior appears to be specific to CephFS - we have reproduced this issue on both Quincy and Pacific.  Similar steps work as expected in the ext4 filesystem amongst others.
Reproduction steps:
1. Create a directory - mkdir dir1
2. Modify mtime using the touch command - touch dir1 3. Create a file 
or directory inside of 'dir1' - mkdir dir1/dir2 Expected result:
mtime for dir1 should change to the time the file or directory was 
created in step 3 Actual result:
there was no change to the mtime for 'dir1'
Note : For more detail, kindly find the attached logs.
Our queries are :
1. Is this expected behavior for CephFS?
2. If so, can you explain why the directory behavior is inconsistent depending on whether the mtime for the directory has previously been manually updated.
Best Regards,
   Sandip Divekar
Component QA Lead SDET.
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Milind
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RE: [ceph-users] Re: Unexpected behavior of directory mtime after being set explicitly

Sandip Divekar

Gregory Farnum

Sandip Divekar

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