linux-ext4 - Re: defragmentation of boot related files

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]

Date:	Thu, 26 Aug 2010 18:47:52 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	andreas@...-net.de
Cc:	Greg Freemyer <greg.freemyer@...il.com>, k-mio@...jp.nec.com,
	linux-ext4@...r.kernel.org
Subject: Re: defragmentation of boot related files

On 2010-08-26, at 14:16, andreas@...-net.de wrote:
>>> Usage: e4defrag -r directory...| device...
>>>       e4defrag -r base_file move_file...<--- new
>>> 
> 
> The new interface looks nice. As I see it's easy to implement cause only the main-function must be modified. If you have no objections, I will do it myself and send you the patch to review it.
> 
>> I suspect the original idea would work better because it is more
>> likely to pack the libs / files into perfectly contiguous block
>> ranges.
> 
> I don't know if it makes a difference for the block allocator. Even though you know the size of all files to be moved.
> 
> For a better result, may it be possible to create a base_file whose inode is part of an empty block group?

There is a /proc/fs/ext4/*/inode_goal that will cause new inodes allocated in the filesystem to be after the specified goal inode.

I suppose it would also be possible to have e4defrag simply take an inode number in the form "<inode_number>" in place of "base_file", as debugfs does.

Cheers, Andreas





--
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