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Date: Mon, 15 Aug 2022 13:03:37 +0200 From: Stefan Wahren <stefan.wahren@...e.com> To: Jan Kara <jack@...e.cz> Cc: 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, Florian Fainelli <f.fainelli@...il.com> Subject: Re: [Regression] ext4: changes to mb_optimize_scan cause issues on Raspberry Pi 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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