[Bug 288014] net/samba420: errors when copying sparse files to samba share

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 18 Jul 2025 06:14:54 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288014

--- Comment #15 from Andrej Ebert <andrej@ebert.su> ---
(In reply to hunt from comment #9)

Please try the attached patch disabling posix_fallocate. And it definitely is
an upstream issue, just FreeBSD-specific.  Samba should fallback to just
writing blocks if something doesn't work with posix_fallocate, but doesn't do
that.

Aside from this, preallocating space for sparse files just doesn't make sense
on ZFS(this is what fallocate does), and apparently is horribly slow on UFS.

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