Date: Sun, 13 Dec 2020 12:20:49 -0700 From: Alan Somers <asomers@freebsd.org> To: Warner Losh <imp@bsdimp.com> Cc: Ian Lepore <ian@freebsd.org>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: char devices without SI_UNMAPPED? Message-ID: <CAOtMX2iu4ipzdvTer=BzG0hgOiZE2nFHwkrq20bPPoXQe9qkfA@mail.gmail.com> In-Reply-To: <CANCZdfqyLHhuq7h1w7dWh3HoywByOg2RxrezXGTPn_xfYAsTSw@mail.gmail.com> References: <CAOtMX2hFVjFAnNb9wxRTuRsvVptrUsy5C%2BrQECZW-kpKiBXjXA@mail.gmail.com> <6dd927984d69ef0e95e1e90651bcd8087bc4eec4.camel@freebsd.org> <CANCZdfqyLHhuq7h1w7dWh3HoywByOg2RxrezXGTPn_xfYAsTSw@mail.gmail.com>
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On Sun, Dec 13, 2020 at 11:20 AM Warner Losh <imp@bsdimp.com> wrote: > > > On Sun, Dec 13, 2020 at 11:18 AM Ian Lepore <ian@freebsd.org> wrote: > >> On Sun, 2020-12-13 at 10:27 -0700, alan somers wrote: >> > I'm trying to exercise the aio code that handles character devices >> > that >> > don't set the SI_UNMAPPED flag. But I can't find any. Are there any >> > remaining character devices that don't allow unmapped I/O? >> > >> > -Alan >> > >> >> I assume you mean disk-like devices? Probably mmcsd, flash/at45d, >> flash/mx25l. >> > Hm. I don't have any of those. > > There are times that it's disabled administratively as well, but that may > be on a per-I/O basis. > vfs.zfs.vol.unmap_enabled: 1 > This one doesn't seem to work. It looks like the only functionality it gates these days is DIOCGDELETE. > vfs.unmapped_buf_allowed: 1 > Well, this one works. Thanks for the tip. Unfortunately, it's a tunable, so I can't use it for any kind of automated testing. > > "Why do you ask?" is the next question... > > Warner >
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