linux-ext4 - Re: [PATCH 0/5] fallocate system call

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: <20070430052559.GA13145@tuatara.stupidest.org>
Date:	Sun, 29 Apr 2007 22:25:59 -0700
From:	Chris Wedgwood <cw@...f.org>
To:	David Chinner <dgc@....com>
Cc:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>, torvalds@...l.org,
	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, suparna@...ibm.com, cmm@...ibm.com
Subject: Re: [PATCH 0/5] fallocate system call

On Mon, Apr 30, 2007 at 10:47:02AM +1000, David Chinner wrote:

> For FA_ALLOCATE, it's supposed to change the file size if we
> allocate past EOF, right?

I would argue no.  Use truncate for that.

> For FA_DEALLOCATE, does it change the filesize at all?

Same as above.

> Or does
> it just punch a hole in the file?

Yes.

> FWIW, we definitely need a FA_PREALLOCATE mode (FA_ALLOCATE but does
> not change file size) so we can preallocate beyond EOF for apps
> which use O_APPEND (i.e. changing file size would cause problems for
> them).

FA_ALLOCATE should be able to allocate past-EOF I would argue.
-
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html