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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).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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

submitted 10 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] 4 points 10 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 10 months ago* (last edited 10 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)