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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Linux doesn't serve birth time attribute over NFS (discuss.tchncs.de)

submitted 9 months ago by [email protected] to c/[email protected]

5 comments fedilink hide all child comments

According to this Phoronix article, Linux should support the birth time attribute in the NFS server since 5.18. However, it doesn't show up in the stat output when looking at the file through the NFS mount, or elsewhere (at least, the Dolphin file browser and also a macOS client):

% stat file
  File: file
  Size: 0               Blocks: 0          IO Block: 1048576 regular empty file
Device: 0,70    Inode: 103416894   Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/   saiko)   Gid: (  100/   users)
Access: 2023-12-17 03:22:45.368950609 +0100
Modify: 2023-12-17 03:22:45.368950609 +0100
Change: 2023-12-17 03:22:45.368950609 +0100
 Birth: -

What gives? Running stat on the server directly, it shows the attribute. The backing file system is ext4, kernel 6.5.12. The client is using kernel 6.1.63.

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[–] [email protected] 6 points 9 months ago (2 children)

Which version of stat do you have? I get the same blank result locally on ext4 and btrfs filesystems (not over nfs) using stat 8.30 on an rpi4 (raspbian, 5.10.103-v8+).

Seems to work fine with stat 8.32 on xfs on a spot instance I have, running Rocky 9 (5.14.0-362.13.1.el9_3.x86_64).

I thought there might be more info in the changelog: info coreutils aqstat invocationaq but I'm not seeing it.

[–] [email protected] 5 points 9 months ago

[coreutils-announce] coreutils-8.31 released [stable]

stat now prints file creation time when supported by the file system,
on GNU Linux systems with glibc >= 2.28 and kernel >= 4.11.

https://lists.gnu.org/archive/html/coreutils-announce/2019-03/msg00000.html

(found thanks to this blog post titled "File Creation Time in Linux")

[–] [email protected] 2 points 9 months ago

I have 9.3. It works for me on a local file system on the client as well as the server, just not through NFS.

[–] [email protected] 4 points 9 months ago (1 children)

Simple thing, but are you sure you mounted the NFS share as NFSv4? I don't have access to a machine to check right now, but I think it might default to mounting NFSv3, even if both sides support v4.

[–] [email protected] 3 points 9 months ago* (last edited 9 months ago)

It is NFS4:

vineta.h.kfe.pt:/nfs/nas on /nfs/nas type nfs4 (rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,soft,proto=tcp6,timeo=600,retrans=2,sec=krb5p,clientaddr=2001:470:7391::ce,local_lock=none,addr=2001:470:7391::c0,_netdev)