linux-ext4 - Re: e2fsprogs-1.39-tyt3

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Date:	Tue, 1 May 2007 01:56:41 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: e2fsprogs-1.39-tyt3

On Apr 30, 2007  11:22 -0400, Theodore Ts'o wrote:
> One concern I still have is the fact that we're exposing a lot of
> interfaces in libext2fs.so which are very specifically tied to the
> current 48-bit physical/32-bit logical on-disk extent data structure.
> If/when we add support for the 64/64-bit extent data structure, and some
> kind of compressed/bit-packed extent format, those interfaces will have
> to be extended.

Some other comments:
- it appears you have all of extents.c copied into both "block.c" and
  in "extent.c"
- it appears you are missing a couple of extent sanity checks for headers
  and such that were added more recently, but those might also have been
  removed by you
- do the patches as they stand actually fix the duplicate block test
  cases yet?  It seems all of the BLOCK_CHANGED handling was removed
  from block_iterate_extents().
- it would be easier to read if the patches were generated with "diff -up"
  (can be set in .quiltrc via 'export QUILT_DIFF_OPTS="-up"'.  I also like
  "export QUILT_NO_DIFF_TIMESTAMPS=1" to avoid tons of gratuitous changes
  to patches when they are refreshed.

> Another problem is that while external extent blocks are getting byte
> swapped, there is no byte swapping going on for the extents stored in
> the inode.  I haven't tried it on a big endian system, such as Power
> machine, but I'm pretty sure it's going to blow up spectacularly.

Ah, interesting.  We have 64-bit machines for testing, but no big-endian
ones.

> The patches can be found at:
> 
> ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs-interim/e2fsprogs-1.39-tyt3

What else I think is important to get into this patch series is a change
to "mkfs.ext4" so that the default inode size is increased to 256.  I'm
not sure how/if this can be done via mke2fs.conf.

I also wouldn't object to changing the default inode_ratio on large
filesystems to be a lot fewer than 1/8192 bytes.  At a minimum, allowing
an inode_ratio > 1/4MB should be allowed.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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