[Bug 194567] ext4 no longer mounts

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=194567

--- Comment #5 from Theodore Tso (tytso@mit.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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