drbd: prevent NULL pointer deref when resuming diskless primary

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In a multiple error scenario, we may end up with a "frozen" Primary,
that has no access to any data (no local disk, no replication link).

If we then resume-io, we try to generate a new data generation id,
which will fail if there is no longer a local disk.

Double check for available local data,
which prevents the NULL pointer deref.

If we are diskless, turn the resume-io in this situation
into the first stage of a "force down", by bumping the "effective" data
gen id, which will prevent later attach or connect to the former data
set without first being demoted (deconfigured).

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

...

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Lars Ellenberg 2015-03-18 17:13:26 +01:00 • committed by Jens Axboe

parent 668700b40a

commit 9fa4826919

1 changed files with 24 additions and 1 deletions

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25

drivers/block/drbd/drbd_nl.c

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