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io_uring: remove inflight batching in free_many() 

io_free_req_many() is used only for iopoll requests, i.e. reads/writes.
Hence no need to batch inflight unhooking. For safety, it'll be done by
io_dismantle_req(), which replaces __io_req_aux_free(), and looks more
solid and cleaner.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-06-28 12:52:30 +03:00 committed by Jens Axboe
parent 8c9cb6cd9a
commit e6543a816e
1 changed files with 8 additions and 33 deletions
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41
fs/io_uring.c
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@ -1504,7 +1504,7 @@ static inline void io_put_file(struct io_kiocb *req, struct file *file,
fput(file);
}
static void __io_req_aux_free(struct io_kiocb *req)
static void io_dismantle_req(struct io_kiocb *req)
{
if (req->flags & REQ_F_NEED_CLEANUP)
io_cleanup_req(req);
@ -1514,11 +1514,6 @@ static void __io_req_aux_free(struct io_kiocb *req)
io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE));
__io_put_req_task(req);
io_req_work_drop_env(req);
}
static void __io_free_req(struct io_kiocb *req)
{
__io_req_aux_free(req);
if (req->flags & REQ_F_INFLIGHT) {
struct io_ring_ctx *ctx = req->ctx;
@ -1530,7 +1525,11 @@ static void __io_free_req(struct io_kiocb *req)
wake_up(&ctx->inflight_wait);
spin_unlock_irqrestore(&ctx->inflight_lock, flags);
}
}
static void __io_free_req(struct io_kiocb *req)
{
io_dismantle_req(req);
percpu_ref_put(&req->ctx->refs);
if (likely(!io_is_fallback_req(req)))
kmem_cache_free(req_cachep, req);
@ -1549,35 +1548,11 @@ static void io_free_req_many(struct io_ring_ctx *ctx, struct req_batch *rb)
if (!rb->to_free)
return;
if (rb->need_iter) {
int i, inflight = 0;
unsigned long flags;
int i;
for (i = 0; i < rb->to_free; i++) {
struct io_kiocb *req = rb->reqs[i];
if (req->flags & REQ_F_INFLIGHT)
inflight++;
__io_req_aux_free(req);
}
if (!inflight)
goto do_free;
spin_lock_irqsave(&ctx->inflight_lock, flags);
for (i = 0; i < rb->to_free; i++) {
struct io_kiocb *req = rb->reqs[i];
if (req->flags & REQ_F_INFLIGHT) {
list_del(&req->inflight_entry);
if (!--inflight)
break;
}
}
spin_unlock_irqrestore(&ctx->inflight_lock, flags);
if (waitqueue_active(&ctx->inflight_wait))
wake_up(&ctx->inflight_wait);
for (i = 0; i < rb->to_free; i++)
io_dismantle_req(rb->reqs[i]);
}
do_free:
kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs);
percpu_ref_put_many(&ctx->refs, rb->to_free);
rb->to_free = rb->need_iter = 0;