1// SPDX-License-Identifier: GPL-2.0
  2#ifndef IOU_RSRC_H
  3#define IOU_RSRC_H
  4
  5#define IO_NODE_ALLOC_CACHE_MAX 32
  6
  7#define IO_RSRC_TAG_TABLE_SHIFT	(PAGE_SHIFT - 3)
  8#define IO_RSRC_TAG_TABLE_MAX	(1U << IO_RSRC_TAG_TABLE_SHIFT)
  9#define IO_RSRC_TAG_TABLE_MASK	(IO_RSRC_TAG_TABLE_MAX - 1)
 10
 11enum {
 12	IORING_RSRC_FILE		= 0,
 13	IORING_RSRC_BUFFER		= 1,
 14};
 15
 16struct io_rsrc_node {
 17	unsigned char			type;
 18	int				refs;
 19
 20	u64 tag;
 21	union {
 22		unsigned long file_ptr;
 23		struct io_mapped_ubuf *buf;
 24	};
 25};
 26
 27struct io_mapped_ubuf {
 28	u64		ubuf;
 29	unsigned int	len;
 30	unsigned int	nr_bvecs;
 31	unsigned int    folio_shift;
 32	refcount_t	refs;
 33	unsigned long	acct_pages;
 34	struct bio_vec	bvec[] __counted_by(nr_bvecs);
 35};
 36
 37struct io_imu_folio_data {
 38	/* Head folio can be partially included in the fixed buf */
 39	unsigned int	nr_pages_head;
 40	/* For non-head/tail folios, has to be fully included */
 41	unsigned int	nr_pages_mid;
 42	unsigned int	folio_shift;
 43};
 44
 45struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx, int type);
 46void io_free_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node);
 47void io_rsrc_data_free(struct io_ring_ctx *ctx, struct io_rsrc_data *data);
 48int io_rsrc_data_alloc(struct io_rsrc_data *data, unsigned nr);
 49
 50int io_import_fixed(int ddir, struct iov_iter *iter,
 51			   struct io_mapped_ubuf *imu,
 52			   u64 buf_addr, size_t len);
 53
 54int io_register_clone_buffers(struct io_ring_ctx *ctx, void __user *arg);
 55int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
 56int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
 57			    unsigned int nr_args, u64 __user *tags);
 58int io_sqe_files_unregister(struct io_ring_ctx *ctx);
 59int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
 60			  unsigned nr_args, u64 __user *tags);
 61
 62int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
 63			     unsigned nr_args);
 64int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
 65			    unsigned size, unsigned type);
 66int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
 67			unsigned int size, unsigned int type);
 68
 69static inline struct io_rsrc_node *io_rsrc_node_lookup(struct io_rsrc_data *data,
 70						       int index)
 71{
 72	if (index < data->nr)
 73		return data->nodes[array_index_nospec(index, data->nr)];
 74	return NULL;
 75}
 76
 77static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
 78{
 79	if (node && !--node->refs)
 80		io_free_rsrc_node(ctx, node);
 81}
 82
 83static inline bool io_reset_rsrc_node(struct io_ring_ctx *ctx,
 84				      struct io_rsrc_data *data, int index)
 85{
 86	struct io_rsrc_node *node = data->nodes[index];
 87
 88	if (!node)
 89		return false;
 90	io_put_rsrc_node(ctx, node);
 91	data->nodes[index] = NULL;
 92	return true;
 93}
 94
 95static inline void io_req_put_rsrc_nodes(struct io_kiocb *req)
 96{
 97	if (req->file_node) {
 98		io_put_rsrc_node(req->ctx, req->file_node);
 99		req->file_node = NULL;
100	}
101	if (req->flags & REQ_F_BUF_NODE) {
102		io_put_rsrc_node(req->ctx, req->buf_node);
103		req->buf_node = NULL;
104	}
105}
106
107static inline void io_req_assign_rsrc_node(struct io_rsrc_node **dst_node,
108					   struct io_rsrc_node *node)
109{
110	node->refs++;
111	*dst_node = node;
112}
113
114static inline void io_req_assign_buf_node(struct io_kiocb *req,
115					  struct io_rsrc_node *node)
116{
117	io_req_assign_rsrc_node(&req->buf_node, node);
118	req->flags |= REQ_F_BUF_NODE;
119}
120
121int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
122int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
123
124int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
125
126static inline void __io_unaccount_mem(struct user_struct *user,
127				      unsigned long nr_pages)
128{
129	atomic_long_sub(nr_pages, &user->locked_vm);
130}
131
132#endif