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block: force noio scope in blk_mq_freeze_queue

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When block drivers or the core block code perform allocations with a
frozen queue, this could try to recurse into the block device to
reclaim memory and deadlock.  Thus all allocations done by a process
that froze a queue need to be done without __GFP_IO and __GFP_FS.
Instead of tying to track all of them down, force a noio scope as
part of freezing the queue.

Note that nvme is a bit of a mess here due to the non-owner freezes,
and they will be addressed separately.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20250131120352.1315351-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2025-01-31 13:03:47 +01:00
committed by Jens Axboe
parent 14ef49657f
commit 1e1a9cecfa
26 changed files with 136 additions and 84 deletions
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2
drivers/nvme/host/multipath.c
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@@ -60,7 +60,7 @@ void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
lockdep_assert_held(&subsys->lock);
list_for_each_entry(h, &subsys->nsheads, entry)
if (h->disk)
blk_mq_unfreeze_queue(h->disk->queue);
blk_mq_unfreeze_queue_nomemrestore(h->disk->queue);
}
void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)