Date: Tue, 6 Feb 2001 12:40:12 -0800 From: Alfred Perlstein <bright@wintelcom.net> To: Andre Oppermann <oppermann@monzoon.net> Cc: Matt Dillon <dillon@earth.backplane.com>, Rik van Riel <riel@conectiva.com.br>, Mike Silbersack <silby@silby.com>, Poul-Henning Kamp <phk@critter.freebsd.dk>, Charles Randall <crandall@matchlogic.com>, Dan Phoenix <dphoenix@bravenet.com>, Jos Backus <josb@cncdsl.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: soft updates and qmail (RE: qmail IO problems) Message-ID: <20010206124012.V26076@fw.wintelcom.net> In-Reply-To: <3A805F53.F5CD60D9@monzoon.net>; from oppermann@monzoon.net on Tue, Feb 06, 2001 at 09:32:19PM %2B0100 References: <Pine.LNX.4.21.0102061555550.1535-100000@duckman.distro.conectiva> <3A805035.C71AAD5E@monzoon.net> <200102061943.f16Jhp365113@earth.backplane.com> <3A805938.96ED890D@monzoon.net> <20010206121357.S26076@fw.wintelcom.net> <3A805F53.F5CD60D9@monzoon.net>
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* Andre Oppermann <oppermann@monzoon.net> [010206 12:33] wrote: > Alfred Perlstein wrote: > > > > * Andre Oppermann <oppermann@monzoon.net> [010206 12:07] wrote: > > > > > > Yes, my understanding of the meaning of "ordered meta-date update" as > > > I have grasped it from Terry's rants in the past years is not that all > > > meta-data updates on a filesystem have to be done one-after-the-other > > > but ordered in respect to each other; That a link() happens before a > > > unlink() on the same file. Does this make sense? > > > > Only when done by a single process or something waits for the link > > to complete before starting the unlink. If two processes "race" > > to link and unlink then no. > > It is just one process waiting for the link() to complete. And then > unlink(). After completion a IPC signal is send to another process > to pick the file up and continue processing. Basically, you want a fsync right before the IPC. This should bring the metadata up to date with what's in-core and you should then be safe when you reply with your 250 accepted message. -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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