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authorTejun Heo <tj@kernel.org>2015-07-01 20:53:37 -0400
committerJens Axboe <axboe@fb.com>2015-07-02 08:46:00 -0600
commita20135ffbc44545596f9b99c970de097fb497bdd (patch)
tree18d7267ad1c0b0d603b4ca9cb1e43755c344f632 /.mailmap
parenta13f35e8714009145e32ebe2bf25b84e1376e314 (diff)
downloadop-kernel-dev-a20135ffbc44545596f9b99c970de097fb497bdd.zip
op-kernel-dev-a20135ffbc44545596f9b99c970de097fb497bdd.tar.gz
writeback: don't drain bdi_writeback_congested on bdi destruction
52ebea749aae ("writeback: make backing_dev_info host cgroup-specific bdi_writebacks") made bdi (backing_dev_info) host per-cgroup wb's (bdi_writeback's). As the congested state needs to be per-wb and referenced from blkcg side and multiple wbs, the patch made all non-root cong's (bdi_writeback_congested's) reference counted and indexed on bdi. When a bdi is destroyed, cgwb_bdi_destroy() tries to drain all non-root cong's; however, this can hang indefinitely because wb's can also be referenced from blkcg_gq's which are destroyed after bdi destruction is complete. This patch fixes the bug by updating bdi destruction to not wait for cong's to drain. A cong is unlinked from bdi->cgwb_congested_tree on bdi destuction regardless of its reference count as the bdi may go away any point after destruction. wb_congested_put() checks whether the cong is already unlinked on release. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Jon Christopherson <jon@jons.org> Link: https://bugzilla.kernel.org/show_bug.cgi?id=100681 Fixes: 52ebea749aae ("writeback: make backing_dev_info host cgroup-specific bdi_writebacks") Tested-by: Jon Christopherson <jon@jons.org> Signed-off-by: Jens Axboe <axboe@fb.com>
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