linux-ext4 - Re: Commit c1a1e7fc24d6 causes segfault in ext2fs_new

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Date:	Fri, 06 Apr 2012 12:31:25 -0700
From:	Eric Sandeen <sandeen@...hat.com>
To:	Sami Liedes <sami.liedes@....fi>
CC:	"Richard W.M. Jones" <rjones@...hat.com>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: Commit c1a1e7fc24d6 causes segfault in ext2fs_new_inode

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On 4/6/12 12:19 PM, Eric Sandeen wrote:

...

> Thanks; I am actually just now testing my own patch, I wasn't sure if
> you were around and I wanted to get this fixed.  :)
> 
> Mine is more invasive, with all of the full-on inscrutable redirection
> mess every other bitmap function uses ;)  But maybe that's not necessary
> for this new function, since there will be no old users of it.
> 
> We probably need a way to test at least every binary in e2fsprogs
> with the 64-bit flags off, to be sure that old apps won't break.
> 
> For now I just edited every util which set the 64 bit flag and turned
> that off, and ran make check.
> 
> I may send my patch as well, and see what Ted thinks is the best
> fit for the current code layout... yours is simpler, and without
> any API concerns/constraints, it may be better.

Ok, I also tested your patch through make check
with the 64 bit flags off on all the normal utils, and it passed (for all
but the one test which exclusively requires 64-bit bitmaps).  It seems fine
to me, thanks.

However, there seems to be some unstated (?) naming convention about foo_bmap
(for 64-bit bitmaps) vs. foo_bitmap (for 32-bit bitmaps), and "bitmap2"
functions which seem to take 64-bit args, etc.  I'm not sure if this new
function needs to follow similar conventions...

My patch is probably overkill, so I won't bother to send it unless Ted
thinks something like that is necessary.  Documenting the api preservation
framework for 64-bit bitmaps would be really helpful, I think.

- -Eric
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