linux-ext4 - Re: ext2_block_alloc

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Date:	Wed, 24 Dec 2008 12:15:59 +0530
From:	"Sandeep K Sinha" <sandeepksinha@...il.com>
To:	"Andreas Dilger" <adilger@....com>
Cc:	"Peter Teoh" <htmldeveloper@...il.com>,
	"Mike Snitzer" <snitzer@...il.com>,
	"Rohit Sharma" <imreckless@...il.com>,
	Kernelnewbies <kernelnewbies@...linux.org>,
	ext4 <linux-ext4@...r.kernel.org>,
	"Chetan Risbud" <chetan.risbud@...il.com>,
	"Bharti Alatgi" <bharati.alatgi@...il.com>
Subject: Re: ext2_block_alloc_info

Thanks a lot Peter and Andreas for taking out time and going through fscops.
We welcome all your suggestion.

We will soon be uploading all the docs/sources on to the web.
Stay tuned !!!

Thanks,
Again

On Tue, Dec 23, 2008 at 1:35 PM, Andreas Dilger <adilger@....com> wrote:
> On Dec 23, 2008  10:07 +0530, Sandeep K Sinha wrote:
>> I have a tool ready with unfolds a file system completely thrugh
>> ioctl. You will just have to patch the kernel.
>> And that also, its for ext2.
>
> It would be much more generic to use the FIEMAP ioctl, which has made
> it into the 2.6.28 kernel.  It will currently only dump the file data
> and xattr blocks, but it is designed to be extensible to allow dumping
> other kinds of inode metadata (e.g. indirect/index blocks, etc).
>
>> But its really verbose.
>
> There are patches to e2fsprogs to allow filefrag to call FIEMAP to dump
> the file layout.  They were posted to this list a few months ago, and
> are scheduled for upstream inclusion.  While they will be part of e2fsprogs,
> the FIEMAP ioctl is a generic mechanism that is supported by ext2/3/4,
> OCFS, and XFS, and hopefully more now that it is in the kernel.
>
>> You can have a look for the sources @ http://code.google.com/p/fscops/
>> We will be uploading the tool there soon.
>
> While the description of "What OHSM offer" sounds really good, I couldn't
> find any code or description of what is actually implemented.  Is this
> a system that actually works, or is it only describing what you would like
> OHSM to do?
>
> Cheers, Andreas
> --
> Andreas Dilger
> Sr. Staff Engineer, Lustre Group
> Sun Microsystems of Canada, Inc.
>
>



-- 
Regards,
Sandeep.





 	
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