linux-kernel - Re: New filesystem for Linux

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20061103134802.GD11947@wohnheim.fh-wedel.de>
Date:	Fri, 3 Nov 2006 14:48:02 +0100
From:	Jörn Engel <joern@...nheim.fh-wedel.de>
To:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: New filesystem for Linux

On Fri, 3 November 2006 14:31:46 +0100, Mikulas Patocka wrote:
> 
> Really it can batch any number of modifications into one transaction 
> (unless fsync or sync is called). Transaction is closed only on 
> fsync/sync, if 2 minutes pass (can be adjusted) or when the disk runs out 
> of space.

Interesting.  Let me pick an example and see where we're going from
there.  You have four directories, A, B, C and D, none of which is the
parent of another.  Two cross-directory renames happen:
$ mv A/foo B/
$ mv C/bar D/

This will cause four modifications, one to each of the directories.  I
would have assumed that the modifications to A and B receive one
transaction number n, C and D get a different one, n+1 if nothing else
is going on in between.

To commit the first rename, n is written into cct[entry->cc].  To
commit both, n+1 is written instead.  Committing the second
transaction without committing the first is not possible.

Now clearly we are disagreeing, so I must have misunderstood your
design somehow.  Can you see how?

Jörn

-- 
The story so far:
In the beginning the Universe was created.  This has made a lot
of people very angry and been widely regarded as a bad move.
-- Douglas Adams
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/