linux-ext4 - Re: [PATCH 0/3] ext4: introduce two new ioctls

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 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]

Date:	Mon, 24 Jun 2013 18:35:37 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Dave Chinner <david@...morbit.com>,
	Eric Sandeen <esandeen@...hat.com>,
	Andreas Dilger <adilger@...ger.ca>,
	"tytso@....edu" <tytso@....edu>,
	"adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"a.sangwan@...sung.com" <a.sangwan@...sung.com>,
	Namjae Jeon <namjae.jeon@...sung.com>
Subject: Re: [PATCH 0/3] ext4: introduce two new ioctls

2013/6/24, Christoph Hellwig <hch@...radead.org>:
> On Mon, Jun 24, 2013 at 12:44:59PM +1000, Dave Chinner wrote:
>> various DVR companies shipping equivalent ioctl-based functionality
>> for XFS filesystems to both insert and remove chunks in video
>> streams, but I've never been able to find the code for it anywhere.
>
Hi. Christoph.
> Samsung does this, also for UDF.  Namjae, could you please submit these
> two as well, including a proper VFS interface?
Yes, Sure.
Intially, we also thought of adding a new flag to fallocate instead of ioctls.
But as Ted rightly pointed, fallocate works on byte granularity and we
have block aligned restrictions, so once we decided to go for ioctls
and hear other people opninons.
Currently, we can try implementing dave's suggesstion of introducing a
new flag FALLOC_FL_COLLAPSE_RANGE  for falloctae instead of individual
ioctls for both XFS and EXT4.

Thanks.
>
>
--
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