Re: [Regression] ext4: changes to mb_optimize_scan cause issues on Raspberry Pi

[Stefan Wahren]

Hi Jan,

Am 15.08.22 um 12:34 schrieb Jan Kara:
> Hi Stefan,
>
> Back from vacation...
>
> On Sun 31-07-22 22:42:56, Stefan Wahren wrote:
> > Hi Jan,
> >
> > Am 28.07.22 um 12:00 schrieb Jan Kara:
> > > Also can get filesystem metadata image of your card like:
> > >     e2image -r <fs-device> - | gzip >/tmp/ext4-image.gz
> > >
> > > and put it somewhere for download? The image will contain only fs metadata,
> > > not data so it should be relatively small and we won't have access to your
> > > secrets ;). With the image we'd be able to see how the free space looks
> > > like and whether it perhaps does not trigger some pathological behavior.
> > i've problems with this. If i try store uncompressed the metadata of the
> > second SD card partition (/dev/sdb2 = rootfs) the generated image file is
> > nearly big as the whole partition. In compressed state it's 25 MB. Is this
> > expected?
> Yes, that is expected. The resulting file is a sparse file that contains
> only metadata blocks that is the reason why it compresses so well but looks
> big.

i've added here:

https://github.com/lategoodbye/mb_optimize_scan_regress/blob/main/Kingston_SDCIT_rootfs_metadata.gz

> 								Honza