writeback: initialize inode members that track writeback history
inode struct members that track cgroup writeback information should be reinitialized when inode gets allocated from kmem_cache. Otherwise, their values remain and get used by the new inode. Signed-off-by: NTahsin Erdogan <tahsin@google.com> Acked-by: NTejun Heo <tj@kernel.org> Fixes: d10c8095 ("writeback: implement foreign cgroup inode bdi_writeback switching") Signed-off-by: NJens Axboe <axboe@fb.com>
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