Commit 5af110b2 authored Apr 12, 2017 by Jan Kara Committed by Jens Axboe Apr 20, 2017

block: Unregister bdi on last reference drop



Most users will want to unregister bdi when dropping last reference to a
bdi. Only a few users (like block devices) want to play more complex
tricks with bdi registration and unregistration. So unregister bdi when
the last reference to bdi is dropped and just make sure we don't
unregister the bdi the second time if it is already unregistered.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>

parent baf7a616

mm/backing-dev.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -961,6 +961,8 @@ static void release_bdi(struct kref *ref)
		struct backing_dev_info *bdi =
		container_of(ref, struct backing_dev_info, refcnt);

		if (test_bit(WB_registered, &bdi->wb.state))
		bdi_unregister(bdi);
		bdi_exit(bdi);
		kfree(bdi);
		}

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