Date: Sun, 13 Dec 2020 21:40:40 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Alan Somers <asomers@freebsd.org> Cc: Warner Losh <imp@bsdimp.com>, Ian Lepore <ian@freebsd.org>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: char devices without SI_UNMAPPED? Message-ID: <X9ZuOB7Q3PmOgvvY@kib.kiev.ua> In-Reply-To: <CAOtMX2iu4ipzdvTer=BzG0hgOiZE2nFHwkrq20bPPoXQe9qkfA@mail.gmail.com> References: <CAOtMX2hFVjFAnNb9wxRTuRsvVptrUsy5C%2BrQECZW-kpKiBXjXA@mail.gmail.com> <6dd927984d69ef0e95e1e90651bcd8087bc4eec4.camel@freebsd.org> <CANCZdfqyLHhuq7h1w7dWh3HoywByOg2RxrezXGTPn_xfYAsTSw@mail.gmail.com> <CAOtMX2iu4ipzdvTer=BzG0hgOiZE2nFHwkrq20bPPoXQe9qkfA@mail.gmail.com>
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On Sun, Dec 13, 2020 at 12:20:49PM -0700, Alan Somers wrote: > 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. There is enough geoms which do not support unmapped bios, even if only in some configurations. Recursively grep for G_PF_ACCEPT_UNMAPPED in sys/geom to see what I mean. After all, an option for geom_nop should be trivial, to force all bios to map, instead of inheriting from the lower provider.
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