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| author | Ming Lei <ming.lei@redhat.com> | 2018-08-14 23:57:49 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-08-14 11:05:52 -0600 |
| commit | df60f6e835f763258a06cdbb5690a2e35c1aac4e (patch) | |
| tree | 2313844fbbbc0204fadbca168205b46cc619071e /block/blk-rq-qos.c | |
| parent | b089cfd95d32638335c551651a8e00fd2c4edb0b (diff) | |
blk-wbt: fix IO hang in wbt_wait()
On wbt invariant is that if one IO is tracked via WBT_TRACKED, rqw->inflight
should be updated for tracking this IO.
But commit c1c80384c8f ("block: remove external dependency on wbt_flags")
forgets to remove the early handling of !rwb_enabled(rwb) inside wbt_wait(),
then the inflight counter may not be increased in wbt_wait(), but decreased
in wbt_done() for this kind of IO, so this counter may become negative, then
wbt_wait() may wait forever.
This patch fixes the report in the following link:
https://marc.info/?l=linux-block&m=153221542021033&w=2
Fixes: c1c80384c8f ("block: remove external dependency on wbt_flags")
Cc: Josef Bacik <jbacik@fb.com>
Reported-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-rq-qos.c')
0 files changed, 0 insertions, 0 deletions