The maximum number of files under a folder

[liuyue]

Thank you all.

Now I find a patch which can extend ext3 subdirectory limit.
 http://osdir.com/ml/file-systems.ext2.devel/2004-12/msg00026.html

======= 2008-03-19 06:56:58 您在来信中写道：=======

>On Mar 17, 2008  09:32 -0400, Theodore Ts'o wrote:
>> On Mon, Mar 17, 2008 at 03:40:36PM +0800, liuyue wrote:
>> > Theodore Tso,
>> > 
>> > 	In 64bit system, directory size can not be bigger than 2GB?
>> 
>> No, because the high 32-bits for i_size are overloaded to store the
>> directory creation acl.
>
>I think we should change the code (kernel and e2fsprogs) to allow
>i_size_high for directories also.
>
>> In practice, you really don't want to have a directory that huge
>> anyway.  Iterating through it all with readdir() gets horribly slow,
>> and applications that try do anything with really huge directories
>> would be well advised to use a database, because they will get *much*
>> better performance that way....
>
>Actually, for many HPC applications they never do readdir at all.
>The job creates 1 file/process and always uses a predefined filename
>like {job}-{timestamp}-{process} that it will directly look up.
>
>Cheers, Andreas
>--
>Andreas Dilger
>Sr. Staff Engineer, Lustre Group
>Sun Microsystems of Canada, Inc.
>
>
>

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　　　　　　　　liuyue
　　　　　　　　liuyue at ncic.ac.cn
　　　　　　　　　　2008-03-20