diff options
| author | Jens Axboe <axboe@kernel.dk> | 2022-07-21 09:06:47 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-07-24 18:39:18 -0600 |
| commit | f6b543fd03d347e8bf245cee4f2d54eb6ffd8fcb (patch) | |
| tree | 5159aab78b234d41965a12ac991f8a020339cb0e /io_uring/io_uring.c | |
| parent | 4f6a94d337408f23e199eee7d35ed6edc201df0c (diff) | |
io_uring: ensure REQ_F_ISREG is set async offloadfor-5.20/io_uring-2022-07-29
If we're offloading requests directly to io-wq because IOSQE_ASYNC was
set in the sqe, we can miss hashing writes appropriately because we
haven't set REQ_F_ISREG yet. This can cause a performance regression
with buffered writes, as io-wq then no longer correctly serializes writes
to that file.
Ensure that we set the flags in io_prep_async_work(), which will cause
the io-wq work item to be hashed appropriately.
Fixes: 584b0180f0f4 ("io_uring: move read/write file prep state into actual opcode handler")
Link: https://lore.kernel.org/io-uring/20220608080054.GB22428@xsang-OptiPlex-9020/
Reported-by: kernel test robot <oliver.sang@intel.com>
Tested-by: Yin Fengwei <fengwei.yin@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/io_uring.c')
| -rw-r--r-- | io_uring/io_uring.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 624535c62565..4b3fd645d023 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -406,6 +406,9 @@ static void io_prep_async_work(struct io_kiocb *req) if (req->flags & REQ_F_FORCE_ASYNC) req->work.flags |= IO_WQ_WORK_CONCURRENT; + if (req->file && !io_req_ffs_set(req)) + req->flags |= io_file_get_flags(req->file) << REQ_F_SUPPORT_NOWAIT_BIT; + if (req->flags & REQ_F_ISREG) { if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) io_wq_hash_work(&req->work, file_inode(req->file)); |