[Bug 254210] jail: nullfs: deleted files does not free up space

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From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 08 Mar 2025 21:16:34 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254210

--- Comment #17 from Danilo G. Baio <dbaio@freebsd.org> ---
Hi,

Unfortunately, we are still facing this issue in the FreeBSD infra. 
Two jails are involved, gitmir and cgit, plus ZFS.
We are using 14-STABLE with this specific update.
The gitmir dataset usually consumes only about 5GB.

$ uname -a
FreeBSD xxx.yyy.freebsd.org 14.2-STABLE FreeBSD 14.2-STABLE #0
stable/14-n270391-cba91bf59c79: Tue Feb 11 01:59:07 UTC 2025    
root@build-14.freebsd.org:/usr/obj/usr/src/sys/CLUSTER14 amd64

$ cat /etc/fstab.cgit
  /j/jails/gitmir/home/git/ /j/jails/cgit/home/git/ nullfs ro 0 0

zroot/j/jails/gitmir         440G   296G   440G  /j/jails/gitmir

# /etc/rc.d/jail restart cgit

zroot/j/jails/gitmir        5.51G   731G  5.51G  /j/jails/gitmir

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