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From: Bob Liu <bob.liu@oracle.com>
To: axboe@kernel.dk
Cc: io-uring@vger.kernel.org, Bob Liu <bob.liu@oracle.com>
Subject: [PATCH 2/2] fs: io_uring: introduce req_need_defer()
Date: Wed, 13 Nov 2019 18:06:25 +0800	[thread overview]
Message-ID: <20191113100625.10774-2-bob.liu@oracle.com> (raw)
In-Reply-To: <20191113100625.10774-1-bob.liu@oracle.com>

Make the code easier to read.

Signed-off-by: Bob Liu <bob.liu@oracle.com>
---
 fs/io_uring.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 5781bfe..742f6a7 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -448,7 +448,7 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 	return NULL;
 }
 
-static inline bool __io_sequence_defer(struct io_kiocb *req)
+static inline bool __req_need_defer(struct io_kiocb *req)
 {
 	struct io_ring_ctx *ctx = req->ctx;
 
@@ -456,12 +456,12 @@ static inline bool __io_sequence_defer(struct io_kiocb *req)
 					+ atomic_read(&ctx->cached_cq_overflow);
 }
 
-static inline bool io_sequence_defer(struct io_kiocb *req)
+static inline bool req_need_defer(struct io_kiocb *req)
 {
-	if ((req->flags & (REQ_F_IO_DRAIN|REQ_F_IO_DRAINED)) != REQ_F_IO_DRAIN)
-		return false;
+	if ((req->flags & (REQ_F_IO_DRAIN|REQ_F_IO_DRAINED)) == REQ_F_IO_DRAIN)
+		return __req_need_defer(req);
 
-	return __io_sequence_defer(req);
+	return false;
 }
 
 static struct io_kiocb *io_get_deferred_req(struct io_ring_ctx *ctx)
@@ -469,7 +469,7 @@ static struct io_kiocb *io_get_deferred_req(struct io_ring_ctx *ctx)
 	struct io_kiocb *req;
 
 	req = list_first_entry_or_null(&ctx->defer_list, struct io_kiocb, list);
-	if (req && !io_sequence_defer(req)) {
+	if (req && !req_need_defer(req)) {
 		list_del_init(&req->list);
 		return req;
 	}
@@ -482,7 +482,7 @@ static struct io_kiocb *io_get_timeout_req(struct io_ring_ctx *ctx)
 	struct io_kiocb *req;
 
 	req = list_first_entry_or_null(&ctx->timeout_list, struct io_kiocb, list);
-	if (req && !__io_sequence_defer(req)) {
+	if (req && !__req_need_defer(req)) {
 		list_del_init(&req->list);
 		return req;
 	}
@@ -2436,7 +2436,8 @@ static int io_req_defer(struct io_kiocb *req)
 	struct io_uring_sqe *sqe_copy;
 	struct io_ring_ctx *ctx = req->ctx;
 
-	if (!io_sequence_defer(req) && list_empty(&ctx->defer_list))
+	/* Still need defer if there is pending req in defer list. */
+	if (!req_need_defer(req) && list_empty(&ctx->defer_list))
 		return 0;
 
 	sqe_copy = kmalloc(sizeof(*sqe_copy), GFP_KERNEL);
@@ -2444,7 +2445,7 @@ static int io_req_defer(struct io_kiocb *req)
 		return -EAGAIN;
 
 	spin_lock_irq(&ctx->completion_lock);
-	if (!io_sequence_defer(req) && list_empty(&ctx->defer_list)) {
+	if (!req_need_defer(req) && list_empty(&ctx->defer_list)) {
 		spin_unlock_irq(&ctx->completion_lock);
 		kfree(sqe_copy);
 		return 0;
-- 
2.9.5


  reply	other threads:[~2019-11-13 10:07 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-13 10:06 [PATCH 1/2] fs:io_uring: clean up io_uring_cancel_files Bob Liu
2019-11-13 10:06 ` Bob Liu [this message]
2019-11-13 19:37 ` Jens Axboe

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