linux-ext4 - Re: [PATCH 1/2] fs: ext4: Consolidate checks for resize of bigalloc into ext4_resize

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Date:   Wed, 30 Jun 2021 20:48:04 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Josh Triplett <josh@...htriplett.org>
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andreas Dilger <adilger.kernel@...ger.ca>
Subject: Re: [PATCH 1/2] fs: ext4: Consolidate checks for resize of bigalloc
 into ext4_resize_begin

On Thu, Jun 24, 2021 at 10:23:15AM -0400, Theodore Ts'o wrote:
> On Mon, Jun 07, 2021 at 12:15:08PM -0700, Josh Triplett wrote:
> > Two different places checked for attempts to resize a filesystem with
> > the bigalloc feature. Move the check into ext4_resize_begin, which both
> > places already call.
> > 
> > Signed-off-by: Josh Triplett <josh@...htriplett.org>
> 
> Applied, thanks.

I'm going to have to revert this change, since it breaks online
resizing for bigalloc file system.  The issue is that
ext4_resize_begin() is called from *three* places: for
EXT4_IOC_GROUP_ADD, EXT4_IOC_GROUP_EXTEND, and EXT4_IOC_RESIZE_FS.
The first two ioctls are used for the "old-style" online resize, and
bigalloc is not supported for those two ioctls.  However, it *is*
supposed to work for EXT4_IOC_RESIZE_FS.

Unfortunately, this just caused some tests to be skipped (assuming
that this was an old kernel that didn't support this feature) and I
didn't notice it right away.

						- Ted