Milan Broz
fcac03abd3
dm snapshot: fix invalidation deadlock
...
Process persistent exception store metadata IOs in a separate thread.
A snapshot may become invalid while inside generic_make_request().
A synchronous write is then needed to update the metadata while still
inside that function. Since the introduction of
md-dm-reduce-stack-usage-with-stacked-block-devices.patch this has to
be performed by a separate thread to avoid deadlock.
Signed-off-by: Milan Broz <mbroz@redhat.com >
Signed-off-by: Alasdair G Kergon <agk@redhat.com >
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org >
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