[PATCH 3/3] io_uring: keep generic rsrc infra generic

[Pavel Begunkov <asml.silence@gmail.com>]

io_rsrc_ref_quiesce() is a generic resource function, though now it
was wired to allocate and initialise ref nodes with file-specific
callbacks/etc. Keep it sane by passing in as a parameters everything we
need for initialisations, otherwise it will hurt us badly one day.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 fs/io_uring.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 38ed52065a29..f3af499b12a9 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1036,8 +1036,7 @@ static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
 static void destroy_fixed_rsrc_ref_node(struct fixed_rsrc_ref_node *ref_node);
 static struct fixed_rsrc_ref_node *alloc_fixed_rsrc_ref_node(
 			struct io_ring_ctx *ctx);
-static void init_fixed_file_ref_node(struct io_ring_ctx *ctx,
-				     struct fixed_rsrc_ref_node *ref_node);
+static void io_ring_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
 
 static bool io_rw_reissue(struct io_kiocb *req);
 static void io_cqring_fill_event(struct io_kiocb *req, long res);
@@ -7330,11 +7329,19 @@ static void io_sqe_rsrc_kill_node(struct io_ring_ctx *ctx, struct fixed_rsrc_dat
 
 static int io_rsrc_ref_quiesce(struct fixed_rsrc_data *data,
 			       struct io_ring_ctx *ctx,
-			       struct fixed_rsrc_ref_node *backup_node)
+			       void (*rsrc_put)(struct io_ring_ctx *ctx,
+						struct io_rsrc_put *prsrc))
 {
+	struct fixed_rsrc_ref_node *backup_node;
 	int ret;
 
 	do {
+		backup_node = alloc_fixed_rsrc_ref_node(ctx);
+		if (!backup_node)
+			return -ENOMEM;
+		backup_node->rsrc_data = data;
+		backup_node->rsrc_put = rsrc_put;
+
 		io_sqe_rsrc_kill_node(ctx, data);
 		percpu_ref_kill(&data->refs);
 		flush_delayed_work(&ctx->rsrc_put_work);
@@ -7349,13 +7356,8 @@ static int io_rsrc_ref_quiesce(struct fixed_rsrc_data *data,
 		mutex_unlock(&ctx->uring_lock);
 		ret = io_run_task_work_sig();
 		mutex_lock(&ctx->uring_lock);
-
 		if (ret < 0)
 			return ret;
-		backup_node = alloc_fixed_rsrc_ref_node(ctx);
-		if (!backup_node)
-			return -ENOMEM;
-		init_fixed_file_ref_node(ctx, backup_node);
 	} while (1);
 
 	destroy_fixed_rsrc_ref_node(backup_node);
@@ -7390,7 +7392,6 @@ static void free_fixed_rsrc_data(struct fixed_rsrc_data *data)
 static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
 {
 	struct fixed_rsrc_data *data = ctx->file_data;
-	struct fixed_rsrc_ref_node *backup_node;
 	unsigned nr_tables, i;
 	int ret;
 
@@ -7401,12 +7402,7 @@ static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
 	 */
 	if (!data || percpu_ref_is_dying(&data->refs))
 		return -ENXIO;
-	backup_node = alloc_fixed_rsrc_ref_node(ctx);
-	if (!backup_node)
-		return -ENOMEM;
-	init_fixed_file_ref_node(ctx, backup_node);
-
-	ret = io_rsrc_ref_quiesce(data, ctx, backup_node);
+	ret = io_rsrc_ref_quiesce(data, ctx, io_ring_file_put);
 	if (ret)
 		return ret;
 
-- 
2.24.0