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Date: Wed, 15 Feb 2017 23:46:59 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: linux-ext4@...nel.org
Subject: [Bug 194567] ext4 no longer mounts
https://bugzilla.kernel.org/show_bug.cgi?id=194567
--- Comment #5 from Theodore Tso (tytso@....edu) ---
The meta_bg feature allows file system resizing when (a) there is no
resize_inode, OR (b) when the file system has more than 2**32 blocks. We
don't enable the meta_bg field and turn off resize_inode by default because for
smaller file systems on HDD's, using the meta_bg slows down the mount by a
little (since the block group descriptors get spread out across the disk). So
in general the strategy is to use the resize_inode until the file system grows
beyond 2**32 blocks, and only then to switch on the meta_bg feature. So I was
a bit surprised to see your smallish file system with meta_bg. This is
supported primarily for debugging / development processes (so we can easily
test meta_bg without needing huge test disks), and not something I had
necessarily had intended for use in production.
(But thanks for being a guinea pig so we could find this bug! :-) :-) :-)
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