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| author | Pavel Begunkov <asml.silence@gmail.com> | 2020-07-13 23:37:08 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-07-24 12:55:44 -0600 |
| commit | 3ca405ebfc1c3445b049dd25ca3338cbc99837d1 (patch) | |
| tree | 9fbdb13d0191dd287c94f0fad2f82e11e85ab072 /fs | |
| parent | 252917c30f551e8e4377faac81d7fcf8e9629df1 (diff) | |
| download | linux-stable-3ca405ebfc1c3445b049dd25ca3338cbc99837d1.tar.gz linux-stable-3ca405ebfc1c3445b049dd25ca3338cbc99837d1.tar.bz2 linux-stable-3ca405ebfc1c3445b049dd25ca3338cbc99837d1.zip | |
io_uring: share completion list w/ per-op space
Calling io_req_complete(req) means that the request is done, and there
is nothing left but to clean it up. That also means that per-op data
after that should not be used, so we're free to reuse it in completion
path, e.g. to store overflow_list as done in this patch.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/io_uring.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 64ae5b681c62..3cadd5f963b7 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -487,6 +487,11 @@ struct io_statx { struct statx __user *buffer; }; +struct io_completion { + struct file *file; + struct list_head list; +}; + struct io_async_connect { struct sockaddr_storage address; }; @@ -622,6 +627,8 @@ struct io_kiocb { struct io_splice splice; struct io_provide_buf pbuf; struct io_statx statx; + /* use only after cleaning per-op data, see io_clean_op() */ + struct io_completion compl; }; struct io_async_ctx *io; @@ -896,7 +903,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx, static int io_grab_files(struct io_kiocb *req); static void io_complete_rw_common(struct kiocb *kiocb, long res, struct io_comp_state *cs); -static void io_cleanup_req(struct io_kiocb *req); +static void __io_clean_op(struct io_kiocb *req); static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, int fd, struct file **out_file, bool fixed); static void __io_queue_sqe(struct io_kiocb *req, @@ -936,6 +943,12 @@ static void io_get_req_task(struct io_kiocb *req) req->flags |= REQ_F_TASK_PINNED; } +static inline void io_clean_op(struct io_kiocb *req) +{ + if (req->flags & REQ_F_NEED_CLEANUP) + __io_clean_op(req); +} + /* not idempotent -- it doesn't clear REQ_F_TASK_PINNED */ static void __io_put_req_task(struct io_kiocb *req) { @@ -1413,8 +1426,8 @@ static void io_submit_flush_completions(struct io_comp_state *cs) while (!list_empty(&cs->list)) { struct io_kiocb *req; - req = list_first_entry(&cs->list, struct io_kiocb, list); - list_del(&req->list); + req = list_first_entry(&cs->list, struct io_kiocb, compl.list); + list_del(&req->compl.list); __io_cqring_fill_event(req, req->result, req->cflags); if (!(req->flags & REQ_F_LINK_HEAD)) { req->flags |= REQ_F_COMP_LOCKED; @@ -1439,9 +1452,10 @@ static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, io_cqring_add_event(req, res, cflags); io_put_req(req); } else { + io_clean_op(req); req->result = res; req->cflags = cflags; - list_add_tail(&req->list, &cs->list); + list_add_tail(&req->compl.list, &cs->list); if (++cs->nr >= 32) io_submit_flush_completions(cs); } @@ -1515,8 +1529,7 @@ static inline void io_put_file(struct io_kiocb *req, struct file *file, static void io_dismantle_req(struct io_kiocb *req) { - if (req->flags & REQ_F_NEED_CLEANUP) - io_cleanup_req(req); + io_clean_op(req); if (req->io) kfree(req->io); @@ -5402,7 +5415,7 @@ static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) return -EIOCBQUEUED; } -static void io_cleanup_req(struct io_kiocb *req) +static void __io_clean_op(struct io_kiocb *req) { struct io_async_ctx *io = req->io; |