Re: ext3_dx_add_entry: Directory index full!

From: Stefano Fedrigo
Date: Sun May 18 2008 - 19:08:56 EST

On May 18, 2008, at 6:24 PM, Theodore Tso wrote:

No, not a bug, but a limit. Ext3's hash directores are limited to a
depth of 3 blocks, which normally isn't a problem if you are using a
4k blocksize, since each internal node is small; only 8 bytes. So you
have a fanout of 508 for each internal node, and two internal nodes
gets you to over 250,000 4k directory blocks. But with a 1k
blocksize, the internal node fanout is only 124, so that only gets you
a bit more than 15,000 1k directory blocks.

So, if I understand correctly, with a 1024 bytes blocksize, dir_index, and inode size of 128 byte, the maximum number of files in a directory is 123008. With 4k blocks this limit rises to 8,258,048 files?
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