linux-ext4 - How many files to create in one directory?

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-next>] [day] [month] [year] [list]

Message-ID: <52E607B1.2060206@jprs.co.jp>
Date:	Mon, 27 Jan 2014 16:16:01 +0900
From:	Masato Minda <minmin@...s.co.jp>
To:	linux-ext4@...r.kernel.org
Subject: How many files to create in one directory?

Dear Ext4 Developer;

I've copied the files from VxFS to EXT4, I saw the message “Directory
index full!”. I've checked the search engine and found these mails.

  http://www.spinics.net/lists/linux-ext4/msg25058.html
  http://www.spinics.net/lists/linux-ext4/msg25069.html

Our Ext4's block size was 1024. I've changed the block size from 1024 to
4096. Our problem was solved. But I have question.

How many files to create in one directory in 4096 block size?
I think that it is about 3 million files with perfect hashing.

  16*(4096-16)/8*(4096-8)/8*3/4= 3M

Is this correct?

Thanks in advance.

--
Masato minmin Minda <minmin@...s.co.jp>
Japan Registry Services Co., Ltd. (JPRS)

--
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