From: Tomas Hruby <thruby@few.vu.nl>
To: Erik Mouw <erik@harddisk-recovery.com>
Cc: linux-fsdevel@vger.kernel.org
Subject: ext2/3 subdirectory limit [WAS: Choosing and tuning Linux file systems]
Date: Mon, 26 Jun 2006 14:36:35 +0200 [thread overview]
Message-ID: <20060626123635.GA15200@fspc268> (raw)
In-Reply-To: <20060626111024.GB3114@harddisk-recovery.com>
> > More than ~32,000 files in one directory: XFS or reiser
>
> Ext3 can easily have more than 32000 *files* in a directory. However,
> it can only have 32000 *subdirectories* in a directory. This limit is
> from struct ext3_inode->i_links_count, which is an __le16: each
> subdirectory has an entry ".." that links back to its parent increasing
> the parents i_links_count.
I was always wondering why it increases link_count of the parent directory when
creating a subdirectory. It is clear that .. points to the parent, but the
subdirectory cannot exist without its parent and you cannot delete the parent if
it is not empty. Correct me if I am wrong.
What is the link_count (incremented by subdirectories) used for? Is it ext2/3
specific or should it be implemented in such a way by other FS too? I am asking
becuse I see no reason why to do so in our FS.
Cheers,
Tomas
next prev parent reply other threads:[~2006-06-26 12:32 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-25 22:00 Choosing and tuning Linux file systems Valerie Henson
2006-06-25 22:13 ` Matthew Wilcox
2006-06-25 22:26 ` Arjan van de Ven
2006-06-26 7:22 ` Neil Brown
2006-06-26 9:04 ` Nate Diller
2006-06-27 18:46 ` Valerie Henson
2006-06-26 11:10 ` Erik Mouw
2006-06-26 12:36 ` Tomas Hruby [this message]
2006-06-26 12:35 ` ext2/3 subdirectory limit [WAS: Choosing and tuning Linux file systems] Arjan van de Ven
2006-06-26 12:54 ` Theodore Tso
2006-06-26 16:25 ` Andreas Dilger
2006-06-26 17:35 ` Chris Wedgwood
2006-06-26 21:03 ` Tomas Hruby
2006-06-26 21:03 ` Chris Wedgwood
2006-06-26 21:13 ` H. Peter Anvin
2006-06-26 12:59 ` Erik Mouw
2006-06-26 21:09 ` Tomas Hruby
[not found] ` <20060626091357.GQ5817@schatzie.adilger.int>
2006-06-26 22:01 ` Choosing and tuning Linux file systems Valerie Henson
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