lustre: Convert to separately allocated bdi
Allocate struct backing_dev_info separately instead of embedding it inside superblock. This unifies handling of bdi among users. CC: Oleg Drokin <oleg.drokin@intel.com> CC: Andreas Dilger <andreas.dilger@intel.com> CC: James Simmons <jsimmons@infradead.org> CC: lustre-devel@lists.lustre.org Reviewed-by: NAndreas Dilger <andreas.dilger@intel.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NJens Axboe <axboe@fb.com>
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