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authorShaohua Li <shli@fb.com>2015-05-01 09:59:44 -0700
committerJens Axboe <axboe@fb.com>2015-05-04 13:09:55 -0600
commitb2387ddcced8de3e6471a2fb16a409577063016f (patch)
treebd13a1c05ec6b788aab5d53f855b64adeb1a9fdd /block
parent6cd18e711dd8075da9d78cfc1239f912ff28968a (diff)
blk-mq: fix FUA request hang
When a FUA request enters its DATA stage of flush pipeline, the request is added to mq requeue list, the request will then be added to ctx->rq_list. blk_mq_attempt_merge() might merge the request with a bio. Later when the request is finished the flush pipeline, the request->__data_len is 0. Then I only saw the bio gets endio called, the original request never finish. Adding REQ_FLUSH_SEQ into REQ_NOMERGE_FLAGS looks an easy fix. stable: 3.15+ Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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