Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block size

Andrew Morton
2007-10-18T04:09:32Z

On Thu, 11 Oct 2007 13:18:49 +0200 Jan Kara <jack@suse.cz> wrote:

> With 64KB blocksize, a directory entry can have size 64KB which does not fit
> into 16 bits we have for entry lenght. So we store 0xffff instead and convert
> value when read from / written to disk.

btw, this changes ext2's on-disk format.

a) is the ext2 format documented anywhere? If so, that document will
need updating.

b) what happens when an old ext2 driver tries to read and/or write this
directory entry? Do we need a compat flag for it?

c) what happens when old and new ext3 or ext4 try to read/write this
directory entry?