1 files changed, 160 insertions, 0 deletions
diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h
new file mode 100644
index 0000000000..08ac0d8e07
--- /dev/null
+++ b/io_uring/rsrc.h
@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef IOU_RSRC_H
+#define IOU_RSRC_H
+
+#include <net/af_unix.h>
+
+#include "alloc_cache.h"
+
+#define IO_NODE_ALLOC_CACHE_MAX 32
+
+#define IO_RSRC_TAG_TABLE_SHIFT	(PAGE_SHIFT - 3)
+#define IO_RSRC_TAG_TABLE_MAX	(1U << IO_RSRC_TAG_TABLE_SHIFT)
+#define IO_RSRC_TAG_TABLE_MASK	(IO_RSRC_TAG_TABLE_MAX - 1)
+
+enum {
+	IORING_RSRC_FILE		= 0,
+	IORING_RSRC_BUFFER		= 1,
+};
+
+struct io_rsrc_put {
+	u64 tag;
+	union {
+		void *rsrc;
+		struct file *file;
+		struct io_mapped_ubuf *buf;
+	};
+};
+
+typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
+
+struct io_rsrc_data {
+	struct io_ring_ctx		*ctx;
+
+	u64				**tags;
+	unsigned int			nr;
+	u16				rsrc_type;
+	bool				quiesce;
+};
+
+struct io_rsrc_node {
+	union {
+		struct io_cache_entry		cache;
+		struct io_ring_ctx		*ctx;
+	};
+	int				refs;
+	bool				empty;
+	u16				type;
+	struct list_head		node;
+	struct io_rsrc_put		item;
+};
+
+struct io_mapped_ubuf {
+	u64		ubuf;
+	u64		ubuf_end;
+	unsigned int	nr_bvecs;
+	unsigned long	acct_pages;
+	struct bio_vec	bvec[] __counted_by(nr_bvecs);
+};
+
+void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
+void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
+struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
+int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);
+
+int io_import_fixed(int ddir, struct iov_iter *iter,
+			   struct io_mapped_ubuf *imu,
+			   u64 buf_addr, size_t len);
+
+void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
+int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
+int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
+			    unsigned int nr_args, u64 __user *tags);
+void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
+int io_sqe_files_unregister(struct io_ring_ctx *ctx);
+int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
+			  unsigned nr_args, u64 __user *tags);
+
+int __io_scm_file_account(struct io_ring_ctx *ctx, struct file *file);
+
+static inline bool io_file_need_scm(struct file *filp)
+{
+	return false;
+}
+
+static inline int io_scm_file_account(struct io_ring_ctx *ctx,
+				      struct file *file)
+{
+	if (likely(!io_file_need_scm(file)))
+		return 0;
+	return __io_scm_file_account(ctx, file);
+}
+
+int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
+			     unsigned nr_args);
+int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
+			    unsigned size, unsigned type);
+int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
+			unsigned int size, unsigned int type);
+
+static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
+{
+	lockdep_assert_held(&ctx->uring_lock);
+
+	if (node && !--node->refs)
+		io_rsrc_node_ref_zero(node);
+}
+
+static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
+					  struct io_ring_ctx *ctx)
+{
+	io_put_rsrc_node(ctx, req->rsrc_node);
+}
+
+static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
+				       struct io_rsrc_node *node)
+{
+	node->refs++;
+}
+
+static inline void io_req_set_rsrc_node(struct io_kiocb *req,
+					struct io_ring_ctx *ctx,
+					unsigned int issue_flags)
+{
+	if (!req->rsrc_node) {
+		io_ring_submit_lock(ctx, issue_flags);
+
+		lockdep_assert_held(&ctx->uring_lock);
+
+		req->rsrc_node = ctx->rsrc_node;
+		io_charge_rsrc_node(ctx, ctx->rsrc_node);
+		io_ring_submit_unlock(ctx, issue_flags);
+	}
+}
+
+static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
+{
+	unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
+	unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
+
+	return &data->tags[table_idx][off];
+}
+
+static inline int io_rsrc_init(struct io_ring_ctx *ctx)
+{
+	ctx->rsrc_node = io_rsrc_node_alloc(ctx);
+	return ctx->rsrc_node ? 0 : -ENOMEM;
+}
+
+int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
+int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
+
+int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
+
+static inline void __io_unaccount_mem(struct user_struct *user,
+				      unsigned long nr_pages)
+{
+	atomic_long_sub(nr_pages, &user->locked_vm);
+}
+
+#endif