fs: don't reassign dirty inodes to default_backing_dev_info
If we have dirty inodes we need to call the filesystem for it, even if the device has been removed and the filesystem will error out early. The current code does that by reassining all dirty inodes to the default backing_dev_info when a bdi is unlinked, but that's pretty pointless given that the bdi must always outlive the super block. Instead of stopping writeback at unregister time and moving inodes to the default bdi just keep the current bdi alive until it is destroyed. The containing objects of the bdi ensure this doesn't happen until all writeback has finished by erroring out. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NTejun Heo <tj@kernel.org> Reviewed-by: NJan Kara <jack@suse.cz> Killed the redundant WARN_ON(), as noticed by Jan. Signed-off-by: NJens Axboe <axboe@fb.com>
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