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| author | Jens Axboe <axboe@fb.com> | 2016-11-08 19:39:28 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-11-08 19:39:28 -0700 |
| commit | ae5b2ec8ad5e017126cd4552220f25ce8a6b92e9 (patch) | |
| tree | 8adef3f0d868cdb67dd8d4aba11edf210341ebdf | |
| parent | b57d74aff9ab92fbfb7c197c384d1adfa2827b2e (diff) | |
| download | linux-0-day-ae5b2ec8ad5e017126cd4552220f25ce8a6b92e9.tar.gz linux-0-day-ae5b2ec8ad5e017126cd4552220f25ce8a6b92e9.tar.xz | |
block: set REQ_SYNC if we clear REQ_FUA|REQ_PREFLUSH
If we insert a flush request, we clear REQ_PREFLUSH and/or REQ_FUA,
depending on flush settings. Since op_is_sync() factors those flags
in for deciding whether this request is sync or not, we should
set REQ_SYNC to avoid screwing up this accounting.
This should be less fragile.
Reported-by: Logan Gunthorpe <logang@deltatee.com>
Fixes: b685d3d65ac ("block: treat REQ_FUA and REQ_PREFLUSH as synchronous")
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-flush.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c index c486b7aa62eeb..1bdbb3d3e5f57 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -396,6 +396,13 @@ void blk_insert_flush(struct request *rq) rq->cmd_flags &= ~REQ_FUA; /* + * REQ_PREFLUSH|REQ_FUA implies REQ_SYNC, so if we clear any + * of those flags, we have to set REQ_SYNC to avoid skewing + * the request accounting. + */ + rq->cmd_flags |= REQ_SYNC; + + /* * An empty flush handed down from a stacking driver may * translate into nothing if the underlying device does not * advertise a write-back cache. In this case, simply |