From 1e1a9cecfab3f22ebef0a976f849c87be8d03c1c Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 31 Jan 2025 13:03:47 +0100 Subject: block: force noio scope in blk_mq_freeze_queue 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 Link: https://lore.kernel.org/r/20250131120352.1315351-2-hch@lst.de Signed-off-by: Jens Axboe --- drivers/block/rbd.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'drivers/block/rbd.c') diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 5b393e4a1ddf..faafd7ff43d6 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -7281,9 +7281,10 @@ static ssize_t do_rbd_remove(const char *buf, size_t count) * Prevent new IO from being queued and wait for existing * IO to complete/fail. */ - blk_mq_freeze_queue(rbd_dev->disk->queue); + unsigned int memflags = blk_mq_freeze_queue(rbd_dev->disk->queue); + blk_mark_disk_dead(rbd_dev->disk); - blk_mq_unfreeze_queue(rbd_dev->disk->queue); + blk_mq_unfreeze_queue(rbd_dev->disk->queue, memflags); } del_gendisk(rbd_dev->disk); -- cgit v1.2.3