[PATCHv3 5/7] io_uring: introduce file slot release helper

[Keith Busch <kbusch@fb.com>]

From: Keith Busch <kbusch@kernel.org>

Releasing the pre-registered file follows a repeated pattern. Introduce
a helper to make it easier to add more complexity to this resource in
the future.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 io_uring/filetable.c | 33 +++++++++++++++++++++------------
 io_uring/filetable.h |  3 +++
 io_uring/rsrc.c      |  5 +----
 3 files changed, 25 insertions(+), 16 deletions(-)

diff --git a/io_uring/filetable.c b/io_uring/filetable.c
index 7b473259f3f4..1b8db1918678 100644
--- a/io_uring/filetable.c
+++ b/io_uring/filetable.c
@@ -76,19 +76,13 @@ static int io_install_fixed_file(struct io_ring_ctx *ctx, struct file *file,
 	file_slot = io_fixed_file_slot(&ctx->file_table, slot_index);
 
 	if (file_slot->file_ptr) {
-		struct file *old_file;
-
 		ret = io_rsrc_node_switch_start(ctx);
 		if (ret)
 			goto err;
 
-		old_file = (struct file *)(file_slot->file_ptr & FFS_MASK);
-		ret = io_queue_rsrc_removal(ctx->file_data, slot_index,
-					    ctx->rsrc_node, old_file);
+		ret = io_file_slot_queue_removal(ctx, file_slot);
 		if (ret)
 			goto err;
-		file_slot->file_ptr = 0;
-		io_file_bitmap_clear(&ctx->file_table, slot_index);
 		needs_switch = true;
 	}
 
@@ -148,7 +142,6 @@ int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
 int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset)
 {
 	struct io_fixed_file *file_slot;
-	struct file *file;
 	int ret;
 
 	if (unlikely(!ctx->file_data))
@@ -164,13 +157,10 @@ int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset)
 	if (!file_slot->file_ptr)
 		return -EBADF;
 
-	file = (struct file *)(file_slot->file_ptr & FFS_MASK);
-	ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file);
+	ret = io_file_slot_queue_removal(ctx, file_slot);
 	if (ret)
 		return ret;
 
-	file_slot->file_ptr = 0;
-	io_file_bitmap_clear(&ctx->file_table, offset);
 	io_rsrc_node_switch(ctx, ctx->file_data);
 	return 0;
 }
@@ -191,3 +181,22 @@ int io_register_file_alloc_range(struct io_ring_ctx *ctx,
 	io_file_table_set_alloc_range(ctx, range.off, range.len);
 	return 0;
 }
+
+int io_file_slot_queue_removal(struct io_ring_ctx *ctx,
+			       struct io_fixed_file *file_slot)
+{
+	u32 slot_index = file_slot - ctx->file_table.files;
+	struct file *file;
+	int ret;
+
+	file = (struct file *)(file_slot->file_ptr & FFS_MASK);
+	ret = io_queue_rsrc_removal(ctx->file_data, slot_index,
+				    ctx->rsrc_node, file);
+	if (ret)
+		return ret;
+
+	file_slot->file_ptr = 0;
+	io_file_bitmap_clear(&ctx->file_table, slot_index);
+
+	return 0;
+}
diff --git a/io_uring/filetable.h b/io_uring/filetable.h
index ff3a712e11bf..e52ecf359199 100644
--- a/io_uring/filetable.h
+++ b/io_uring/filetable.h
@@ -34,6 +34,9 @@ int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
 int io_register_file_alloc_range(struct io_ring_ctx *ctx,
 				 struct io_uring_file_index_range __user *arg);
 
+int io_file_slot_queue_removal(struct io_ring_ctx *ctx,
+			       struct io_fixed_file *file_slot);
+
 unsigned int io_file_get_flags(struct file *file);
 
 static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index 59704b9ac537..1f10eecad4d7 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -469,12 +469,9 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
 		file_slot = io_fixed_file_slot(&ctx->file_table, i);
 
 		if (file_slot->file_ptr) {
-			file = (struct file *)(file_slot->file_ptr & FFS_MASK);
-			err = io_queue_rsrc_removal(data, i, ctx->rsrc_node, file);
+			err = io_file_slot_queue_removal(ctx, file_slot);
 			if (err)
 				break;
-			file_slot->file_ptr = 0;
-			io_file_bitmap_clear(&ctx->file_table, i);
 			needs_switch = true;
 		}
 		if (fd != -1) {
-- 
2.30.2