Date: Wed, 07 Nov 2018 20:20:15 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Warner Losh <imp@bsdimp.com> Cc: "Rodney W. Grimes" <rgrimes@freebsd.org>, Ian Lepore <ian@freebsd.org>, Maxim Sobolev <sobomax@freebsd.org>, src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org, Pawel Jakub Dawidek <pjd@freebsd.org> Subject: Re: svn commit: r340187 - head/sys/geom Message-ID: <1603.1541622015@critter.freebsd.dk> In-Reply-To: <CANCZdfrK-7vBETkhfQ9KkM4usrvjVh8wS_OZJiDmH5336DTsqQ@mail.gmail.com> References: <1541606248.52306.42.camel@freebsd.org> <201811071606.wA7G6mQW001639@pdx.rh.CN85.dnsmgr.net> <CANCZdfrK-7vBETkhfQ9KkM4usrvjVh8wS_OZJiDmH5336DTsqQ@mail.gmail.com>
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-------- In message <CANCZdfrK-7vBETkhfQ9KkM4usrvjVh8wS_OZJiDmH5336DTsqQ@mail.gmail.com> , Warner Losh writes: >BIO_FLUSH is primarily done to force ordering points, Originally BIO_FLUSH was defined the way it is, to make it possible to flush an isolated specified range on providers which support that so that fsync(2) could be implemented that way. I can't remember the exact semantics of the two "magic" flush operations (off=0,len=0) and (off=end,len=0) but they were different from each other in some important aspect (Pawel?) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.help
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