Date: Thu, 8 Feb 2001 09:33:29 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Tony Finch <dot@dotat.at> Cc: Greg Black <gjb@gbch.net>, Andre Oppermann <oppermann@monzoon.net>, 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>, Alfred Perlstein <bright@wintelcom.net>, Jos Backus <josb@cncdsl.com>, freebsd-hackers@FreeBSD.ORG, Tony Finch <dot@dotat.at> Subject: Re: soft updates and qmail (RE: qmail IO problems) Message-ID: <200102081733.f18HXTp07738@earth.backplane.com> References: <Pine.LNX.4.21.0102061555550.1535-100000@duckman.distro.conectiva> <3A805035.C71AAD5E@monzoon.net> <200102061943.f16Jhp365113@earth.backplane.com> <3A805938.96ED890D@monzoon.net> <20010207110208.G74296@hand.dotat.at> <nospam-3a813095860ab65@maxim.gbch.net> <20010208081542.M74296@hand.dotat.at>
next in thread | previous in thread | raw e-mail | index | archive | help
:>> already existing?
:>
:>Why not just read the man page for rename(2) before making
:>suggestions?
:
:I did. I'm glad I was right that it's deleting the destination that is
:the problem. I would have thought it would be easy to be sure that
:spool filenames are unique, but OTOH I guess that's not completely
:robust.
:
:Tony.
:--
:f.a.n.finch fanf@covalent.net dot@dotat.at
Yes, rename() will 'delete' the destination file if it previously
existed. Of course, if the spool file names are unique then you
are not in danger of deleting anything on the destination.
If softupdates is turned on, rename() is 100% safe -- softupdates will
guarentee that the file will exist in one directory or the other, and
never get lost. The absolute worst crash-case that can occur is for
the file to wind up in both directories (as if a hardlink had been
issued). There is no need for a link() operation followed by a remove().
-Matt
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200102081733.f18HXTp07738>