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blk-mq: fix for flush deadlock

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The flush state machine takes in a struct request, which then is
submitted multiple times to the underling driver.  The old block code
requeses the same request for each of those, so it does not have an
issue with tapping into the request pool.  The new one on the other hand
allocates a new request for each of the actualy steps of the flush
sequence. If have already allocated all of the tags for IO, we will
fail allocating the flush request.

Set aside a reserved request just for flushes.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2013-10-28 13:33:58 -06:00 • committed by Jens Axboe
commit 3228f48be2
4 changed files with 15 additions and 5 deletions
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block/blk-flush.c
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@ -286,7 +286,7 @@ static void mq_flush_work(struct work_struct *work)
/* We don't need set REQ_FLUSH_SEQ, it's for consistency */
rq = blk_mq_alloc_request(q, WRITE_FLUSH|REQ_FLUSH_SEQ,
__GFP_WAIT|GFP_ATOMIC);
__GFP_WAIT|GFP_ATOMIC, true);
rq->cmd_type = REQ_TYPE_FS;
rq->end_io = flush_end_io;