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

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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




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