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Re: bin/45072 (fsck_ext2fs dosn't work well with ext2fs's without alternate superblocks)
The following reply was made to PR bin/45072; it has been noted by GNATS.
From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
Cc: dholland%NetBSD.org@localhost, tsutsui%ceres.dti.ne.jp@localhost
Subject: Re: bin/45072 (fsck_ext2fs dosn't work well with ext2fs's without
Date: Sat, 18 Jun 2011 02:33:22 +0900
> Can you clear up with the linux ext2fs folks what the correct behavior of
> linux e2fsck should be?
I'm afraid there is no proper documents other than sources of e2fsprogs..
> One possibility suggested was that the volume might have gotten resized,
> which would move the alternate superblocks.
IIUC ext2fs uses a fixed block number per block group (cylinder group)
so alternate superblocks are always allocated at the same blocks even
after resize if block size is not changed.
(see also cg_has_sb() in <ufs/ext2fs/ext2fs.h>)
> Another possibility is that
> Ubuntu did something ext4-related that our ext2 tools don't understand.
At least fsck_ext2fs(8) seems to check INCOMPATIBLE FEATURE bits
in superblock. (though I'm not sure how Linux guys take care
of backward compatibititty)
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