From: Collin Funk Date: Fri, 20 Feb 2026 16:48:55 GMT Subject: Re: [PATCH] copy.c: use `sendfile()` for in-kernel file copying on Linux Message-ID: <87o6ljtl6w.fsf@gmail.com> In-Reply-To: Ed Maste writes: > On Sat, 14 Feb 2026 at 11:50, Chris Torek wrote: >> >> Ah, more importantly, FreeBSD's sendfile only operates on sockets. > > True. If benchmarking shows this is profitable then we'd want to use > copy_file_range(2) on FreeBSD. We use copy_file_range in GNU Coreutils. Note that it has quite a few issues [1], including a recent one affecting files larger than INT_MAX bytes [2][3]. Coreutils has Gnulib to work around this stuff, and the performance improvement is meaningful for 'cp'. Based on earlier messages in this thread, I am not sure if it is worth dealing with in this case. Collin [1] https://lwn.net/Articles/789527/ [2] https://sourceware.org/PR33245 [3] https://bugs.gnu.org/79139