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md: protect against crash upon fsync on ro array

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If an fsync occurs on a read-only array, we need to send a
completion for the IO and may not increment the active IO count.
Otherwise, we hit a bug trace and can't stop the MD array anymore.

By advice of Christoph Hellwig we return success upon a flush
request but we return -EROFS for other writes.
We detect flush requests by checking if the bio has zero sectors.

This patch is suitable to any -stable kernel to which it applies.

Cc: Christoph Hellwig <[email protected]>
Cc: Ben Hutchings <[email protected]>
Cc: NeilBrown <[email protected]>
Cc: [email protected]
Signed-off-by: Sebastian Riemer <[email protected]>
Reported-by: Ben Hutchings <[email protected]>
Acked-by: Paul Menzel <[email protected]>
Signed-off-by: NeilBrown <[email protected]>
This commit is contained in:
Sebastian Riemer 2013-02-21 13:28:09 +11:00 • committed by NeilBrown
commit bbfa57c0f2
1 changed files with 4 additions and 0 deletions
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4
drivers/md/md.c
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@ -307,6 +307,10 @@ static void md_make_request(struct request_queue *q, struct bio *bio)
bio_io_error(bio);
return;
}
if (mddev->ro == 1 && unlikely(rw == WRITE)) {
bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
return;
}
smp_rmb(); /* Ensure implications of 'active' are visible */
rcu_read_lock();
if (mddev->suspended) {