dm snapshot: fix invalidation deadlock

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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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Milan Broz 2007-07-12 17:28:00 +01:00 • committed by Linus Torvalds

parent 596f138eed

commit fcac03abd3

1 changed files with 43 additions and 5 deletions

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drivers/md/dm-exception-store.c

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