[PATCH v1] fuse: optimize over-io-uring request expiration check

[Joanne Koong <joannelkoong@xxxxxxxxx>]

Currently, when checking whether a request has timed out, we check
fpq processing, but fuse-over-io-uring has one fpq per core and 256
entries in the processing table. For systems where there are a
large number of cores, this may be too much overhead.

Instead of checking the fpq processing list, check ent_w_req_queue,
ent_in_userspace, and ent_commit_queue.

Signed-off-by: Joanne Koong <joannelkoong@xxxxxxxxx>
---
 fs/fuse/dev.c        |  2 +-
 fs/fuse/dev_uring.c  | 23 ++++++++++++++++++++---
 fs/fuse/fuse_dev_i.h |  1 -
 3 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 3c03aac480a4..80a11ef4b69a 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -45,7 +45,7 @@ bool fuse_request_expired(struct fuse_conn *fc, struct list_head *list)
 	return time_is_before_jiffies(req->create_time + fc->timeout.req_timeout);
 }
 
-bool fuse_fpq_processing_expired(struct fuse_conn *fc, struct list_head *processing)
+static bool fuse_fpq_processing_expired(struct fuse_conn *fc, struct list_head *processing)
 {
 	int i;
 
diff --git a/fs/fuse/dev_uring.c b/fs/fuse/dev_uring.c
index 5c9b5a5fb7f7..dfa6c5337bbf 100644
--- a/fs/fuse/dev_uring.c
+++ b/fs/fuse/dev_uring.c
@@ -90,6 +90,7 @@ static void fuse_uring_req_end(struct fuse_ring_ent *ent, int error)
 		fuse_uring_flush_bg(queue);
 		spin_unlock(&fc->bg_lock);
 	}
+	ent->fuse_req = NULL;
 
 	spin_unlock(&queue->lock);
 
@@ -97,8 +98,7 @@ static void fuse_uring_req_end(struct fuse_ring_ent *ent, int error)
 		req->out.h.error = error;
 
 	clear_bit(FR_SENT, &req->flags);
-	fuse_request_end(ent->fuse_req);
-	ent->fuse_req = NULL;
+	fuse_request_end(req);
 }
 
 /* Abort all list queued request on the given ring queue */
@@ -140,6 +140,21 @@ void fuse_uring_abort_end_requests(struct fuse_ring *ring)
 	}
 }
 
+static bool ent_list_request_expired(struct fuse_conn *fc, struct list_head *list)
+{
+	struct fuse_ring_ent *ent;
+	struct fuse_req *req;
+
+	list_for_each_entry(ent, list, list) {
+		req = ent->fuse_req;
+		if (req)
+			return time_is_before_jiffies(req->create_time +
+						      fc->timeout.req_timeout);
+	}
+
+	return false;
+}
+
 bool fuse_uring_request_expired(struct fuse_conn *fc)
 {
 	struct fuse_ring *ring = fc->ring;
@@ -157,7 +172,9 @@ bool fuse_uring_request_expired(struct fuse_conn *fc)
 		spin_lock(&queue->lock);
 		if (fuse_request_expired(fc, &queue->fuse_req_queue) ||
 		    fuse_request_expired(fc, &queue->fuse_req_bg_queue) ||
-		    fuse_fpq_processing_expired(fc, queue->fpq.processing)) {
+		    ent_list_request_expired(fc, &queue->ent_w_req_queue) ||
+		    ent_list_request_expired(fc, &queue->ent_in_userspace) ||
+		    ent_list_request_expired(fc, &queue->ent_commit_queue)) {
 			spin_unlock(&queue->lock);
 			return true;
 		}
diff --git a/fs/fuse/fuse_dev_i.h b/fs/fuse/fuse_dev_i.h
index 3c4ae4d52b6f..19c29c6000a7 100644
--- a/fs/fuse/fuse_dev_i.h
+++ b/fs/fuse/fuse_dev_i.h
@@ -63,7 +63,6 @@ void fuse_dev_queue_forget(struct fuse_iqueue *fiq,
 void fuse_dev_queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req);
 
 bool fuse_request_expired(struct fuse_conn *fc, struct list_head *list);
-bool fuse_fpq_processing_expired(struct fuse_conn *fc, struct list_head *processing);
 
 #endif
 
-- 
2.43.5