From: Theodore Tso <tytso@mit.edu>
To: Mark Knibbs <markk@clara.co.uk>
Cc: linux-ext4@vger.kernel.org
Subject: Re: Possible ext2 bug with large sparse files?
Date: Tue, 5 Jun 2007 09:56:06 -0400 [thread overview]
Message-ID: <20070605135606.GE12755@thunk.org> (raw)
In-Reply-To: <E1HvY6M-000Ai0-Ff@oceanus.uk.clara.net>
On Tue, Jun 05, 2007 at 01:25:29PM +0100, Mark Knibbs wrote:
> For whatever reason, it seems the maximum file size for that
> partition is 17,247,252,480 bytes. In itself that behaviour isn't
> necessarily a bug; but if you have any clue how the ext2 maximum file size
> is related (or not) to the amount of free space or the volume size, please
> let me know!
You're using a filesystem with a 1k blocksize, and that's the cause of
the limit. The maximum number of 1k blocks that can be addressed
using the direct/indirect scheme is:
12 + 256 + 256*256 + 256*256*256 = 16843020 blocks
or
16843020 blocks * 1024 bytes/block = 17,247,252,480 bytes
Unless you are using a really tiny filesystem, you really don't want
to be using 1k block sizes; in addition to imposing this 16GB file
size limit, it also makes the filesystem much more inefficient for
large files.
Regards,
- Ted
next prev parent reply other threads:[~2007-06-05 13:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-05 12:25 Possible ext2 bug with large sparse files? Mark Knibbs
2007-06-05 13:56 ` Theodore Tso [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-06-06 13:18 Mark Knibbs
2007-06-07 17:51 ` Andreas Dilger
2007-06-07 21:40 ` Mark Knibbs
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