From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars Marowsky-Bree Subject: Re: reiser4 data journalling? Date: Fri, 29 Aug 2003 15:12:50 +0200 Message-ID: <20030829131250.GU24767@marowsky-bree.de> References: <3F4E3AF9.2060100@tupshin.com> <16206.16138.72832.920045@laputa.namesys.com> <3F4E6AA4.3030900@namesys.com> <20030829001814.GB9019@zero> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com Content-Disposition: inline In-Reply-To: <20030829001814.GB9019@zero> List-Id: Content-Type: text/plain; charset="iso-8859-1" To: Reiserfs List On 2003-08-28T20:18:14, Tom Vier said: > and shell builtins would have to be modded to insure page alignment. it > would be neat if all the regular builtins (cp, mv, ln) were atomic. mv (ie, rename), ln and rm have always been atomic. That's a POSIX requirement. The new thing with reiserfs4 seems to be that if you do a write of, say, 1M size in the atomic way, another reading process will either see all of the write or none of the write to have taken place. (Right now, you could see a 'partial' read, where some pages from the write have been written already while others return the old data.) And apparently, you can say "begin transaction" and "commit / abort transaction" to achieve the same for multiple operations as a group. Hans, does that support nested transactions, too? And one thing has slipped from my mind: How do I enter a transaction? is it like chroot(), or a task-specific thing, how can child processes participate in the transaction etc? Sincerely, Lars Marowsky-Br=E9e --=20 High Availability & Clustering ever tried. ever failed. no matter. SuSE Labs try again. fail again. fail better. Research & Development, SuSE Linux AG -- Samuel Beckett