[PATCH v2 RESEND] io_uring/fdinfo: add timeout_list to fdinfo

[Ruyi Zhang]

io_uring fdinfo contains most of the runtime information,which is
helpful for debugging io_uring applications; However, there is
currently a lack of timeout-related information, and this patch adds
timeout_list information.

--
changes since v1:
- use _irq version spin_lock.
- Fixed formatting issues and delete redundant code.
- v1 :https://lore.kernel.org/io-uring/20240812020052.8763-1-ruyi.zhang@xxxxxxxxxxx/
--

Signed-off-by: Ruyi Zhang <ruyi.zhang@xxxxxxxxxxx>
---
 io_uring/fdinfo.c  | 14 ++++++++++++++
 io_uring/timeout.c | 12 ------------
 io_uring/timeout.h | 12 ++++++++++++
 3 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c
index d43e1b5fcb36..f524c3cd6f57 100644
--- a/io_uring/fdinfo.c
+++ b/io_uring/fdinfo.c
@@ -14,6 +14,7 @@
 #include "fdinfo.h"
 #include "cancel.h"
 #include "rsrc.h"
+#include "timeout.h"
 
 #ifdef CONFIG_PROC_FS
 static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id,
@@ -55,6 +56,7 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file)
 	struct io_ring_ctx *ctx = file->private_data;
 	struct io_overflow_cqe *ocqe;
 	struct io_rings *r = ctx->rings;
+	struct io_timeout *timeout;
 	struct rusage sq_usage;
 	unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1;
 	unsigned int sq_head = READ_ONCE(r->sq.head);
@@ -235,5 +237,17 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file)
 		seq_puts(m, "NAPI:\tdisabled\n");
 	}
 #endif
+
+	seq_puts(m, "TimeoutList:\n");
+	spin_lock_irq(&ctx->timeout_lock);
+	list_for_each_entry(timeout, &ctx->timeout_list, list) {
+		struct io_timeout_data *data;
+
+		data = cmd_to_io_kiocb(timeout)->async_data;
+		seq_printf(m, "  off=%u, repeats=%u, sec=%lld, nsec=%ld\n",
+			   timeout->off, timeout->repeats, data->ts.tv_sec,
+			   data->ts.tv_nsec);
+	}
+	spin_unlock_irq(&ctx->timeout_lock);
 }
 #endif
diff --git a/io_uring/timeout.c b/io_uring/timeout.c
index 9973876d91b0..4449e139e371 100644
--- a/io_uring/timeout.c
+++ b/io_uring/timeout.c
@@ -13,18 +13,6 @@
 #include "cancel.h"
 #include "timeout.h"
 
-struct io_timeout {
-	struct file			*file;
-	u32				off;
-	u32				target_seq;
-	u32				repeats;
-	struct list_head		list;
-	/* head of the link, used by linked timeouts only */
-	struct io_kiocb			*head;
-	/* for linked completions */
-	struct io_kiocb			*prev;
-};
-
 struct io_timeout_rem {
 	struct file			*file;
 	u64				addr;
diff --git a/io_uring/timeout.h b/io_uring/timeout.h
index a6939f18313e..befd489a6286 100644
--- a/io_uring/timeout.h
+++ b/io_uring/timeout.h
@@ -1,5 +1,17 @@
 // SPDX-License-Identifier: GPL-2.0
 
+struct io_timeout {
+	struct file			*file;
+	u32				off;
+	u32				target_seq;
+	u32				repeats;
+	struct list_head		list;
+	/* head of the link, used by linked timeouts only */
+	struct io_kiocb			*head;
+	/* for linked completions */
+	struct io_kiocb			*prev;
+};
+
 struct io_timeout_data {
 	struct io_kiocb			*req;
 	struct hrtimer			timer;
-- 
2.43.0