[Bug 220489] New: copy_file_range glibc user-space emulation in versions 2.27-2.29 only

[Bug 220489] New: copy_file_range glibc user-space emulation in versions 2.27-2.29 only

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220489

            Bug ID: 220489
           Summary: copy_file_range glibc user-space emulation in versions
                    2.27-2.29 only
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: low
          Priority: P3
         Component: man-pages
          Assignee: documentation_man-pages@kernel-bugs.osdl.org
          Reporter: hvtaifwkbgefbaei@gmail.com
        Regression: No

Current version of the man page: "Linux 4.5, but glibc 2.27 provides a
user-space emulation when it is not available."

However, glibc 2.30 changelog:
The copy_file_range function fails with ENOSYS if the kernel does not support
the system call of the same name. Previously, user space emulation was
performed, but its behavior did not match the kernel behavior, which was deemed
too confusing. Applications which use the copy_file_range function can no
longer rely on glibc to provide a fallback on kernels that do not support the
copy_file_range system call, and if this function returns ENOSYS, they will
need to use their own fallback. Support for copy_file_range for most
architectures was added in version 4.5 of the mainline Linux kernel.

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[Bug 220489] copy_file_range glibc user-space emulation in versions 2.27-2.29 only

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220489

--- Comment #1 from Wes Gibbs (wg21908@gmail.com) ---
I emailed linux-man@vger.kernel.org with my plan/interest to work this ticket. 
Archive of this email shown at
https://lore.kernel.org/linux-man/aP0T3yZ0jflUtliV@secra.localdomain/T/#u

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[Bug 220489] copy_file_range glibc user-space emulation in versions 2.27-2.29 only

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220489

--- Comment #2 from Wes Gibbs (wg21908@gmail.com) ---
I'm aware of have some remaining feedback to address on this ticket, feedback
that was provided by Alejandro Colomar that was sent on 2025-10-28 23:24.  I
will need to address this in a v3 patch.  I will have this sent in in the next
few days.  Thank you for the peer review.

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