Re: [PATCH] fs: remove s_old_blocksize from struct super_block

[Pekka Enberg <penberg@cs.helsinki.fi>]

Hi Anton,

On Fri, 2 Dec 2005, Pekka Enberg wrote:
> > The s_old_blocksize field of struct super_block is only used as a temporary
> > variable in get_sb_bdev(). This patch changes the function to use a local
> > variable instead so we can kill the field from struct super_block.

On Sat, 2005-12-03 at 11:02 +0000, Anton Altaparmakov wrote:
> s_old_blocksize used to be used to restore the blocksize after the 
> filesystem had failed to mount or had unmounted.  Not restoring this leads 
> to all sorts of problems since the blocksize may be set for example to 4k 
> but some userspace app may need it to be set to 1k or whatever.  There 
> used to be applications that failed which is why s_old_blocksize was 
> introduced and it used to restore the blocksize.
> 
> I have no idea why/when the restoring has been removed but chances are the 
> removal was wrong.  Now every file system will need to restore the 
> blocksize itself (as it used to be before s_old_blocksize and blocksize 
> restoral was introduced).  Except whoever removed the restoration failed 
> to fix up all file systems.  )-:

It was removed in this commit, I think:

http://www.kernel.org/git/?p=linux/kernel/git/torvalds/old-2.6-bkcvs.git;a=commit;h=294c42046966e927ef86c0d4ce71cff32d9b458c

			Pekka