Re: BIG files & file systems

From: Trond Myklebust (
Date: Fri Aug 02 2002 - 10:39:46 EST

>>>>> " " == Hans Reiser <> writes:

> There are a number of interfaces that need expansion in 2.5.
> Telldir and seekdir would be much better if they took as
> argument some filesystem specific opaque cookie
> (e.g. filename). Using a byte offset to reference a directory
> entry that was found with a filename is an implementation
> specific artifact that obviously only works for a ufs/s5fs/ext2
> type of filesystem, and is just wrong.

> 4 billion files is not enough to store the government's XML
> databases in.

That's more of a glibc-specific bug. Most other libc implementations
appear to be quite capable of providing a userspace 'readdir()' which
doesn't ever use the lseek() syscall.

Note however that NFS compatibility *does* provide a limitation here:
the cookies that are passed between client and server are limited to
32 bits (NFSv2) or 64 bits (NFSv3/v4), so you'll be wanting to provide
some hack to get around this...

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