Date: Mon, 19 Jun 2006 16:32:31 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: "R. B. Riddick" <arne_woerner@yahoo.com> Cc: freebsd-fs@FreeBSD.org Subject: Re: Journaling UFS with gjournal. Message-ID: <20060619143231.GF1130@garage.freebsd.pl> In-Reply-To: <20060619133706.63795.qmail@web30302.mail.mud.yahoo.com> References: <20060619131101.GD1130@garage.freebsd.pl> <20060619133706.63795.qmail@web30302.mail.mud.yahoo.com>
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[-- Attachment #1 --] On Mon, Jun 19, 2006 at 06:37:06AM -0700, R. B. Riddick wrote: +> --- Pawel Jakub Dawidek <pjd@FreeBSD.org> wrote: +> > 2. If we have file system, synchronize it. +> > 3. Mark file system as clean. +> > 4. Block all write requests to the file system. +> > +> Shouldn't we do 4. before 2.? 4 is done via vfs_write_suspend() function, which synchronize file system once again. +> Do we write _new_ blocks of a file via the journal or directly to the file +> system (I mean: If we have a new file, that grows sequentially from 0 bytes to +> 1GB, it would save some disc access, if we didn't write the data to the +> journal)? As I said gjournal is below file system layer. It receives I/O requests only and cannot say which one is related to growing file, which has metadata inside, etc. -- Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFElrV/ForvXbEpPzQRArG5AJwPSlBnmkANdK8BeVcc/Z7yyux+IQCgs8AO KOtRRf+sOspu7+/IF6PHXjs= =ypFh -----END PGP SIGNATURE-----
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