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Date: Mon, 15 Aug 2022 12:34:52 +0200 From: Jan Kara <jack@...e.cz> To: Stefan Wahren <stefan.wahren@...e.com> Cc: Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org, Ojaswin Mujoo <ojaswin@...ux.ibm.com>, Harshad Shirwadkar <harshadshirwadkar@...il.com>, Theodore Ts'o <tytso@....edu>, Ritesh Harjani <riteshh@...ux.ibm.com>, linux-fsdevel@...r.kernel.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Geetika.Moolchandani1@....com, regressions@...ts.linux.dev Subject: Re: [Regression] ext4: changes to mb_optimize_scan cause issues on Raspberry Pi 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. Honza -- Jan Kara <jack@...e.com> SUSE Labs, CR
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