Hello,
this patch series attempts to solve the problems with the life time of a
backing_dev_info structure. Currently it lives inside request_queue structure
and thus it gets destroyed as soon as request queue goes away. However
the block device inode still stays around and thus inode_to_bdi() call on
that inode (e.g. from flusher worker) may happen after request queue has been
destroyed resulting in oops.
This patch set tries to solve these problems by making backing_dev_info
independent structure referenced from block device inode. That makes sure
inode_to_bdi() cannot ever oops. The patches are lightly tested for now
(they boot, basic tests with adding & removing loop devices seem to do what
I'd expect them to do ;). If someone is able to reproduce crashes on bdi
when device goes away, please test these patches.
I'd also appreciate if people had a look whether the approach I took looks
sensible.
Honza
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