1// SPDX-License-Identifier: GPL-2.0
 2#ifndef IOU_FILE_TABLE_H
 3#define IOU_FILE_TABLE_H
 4
 5#include <linux/file.h>
 6#include <linux/io_uring_types.h>
 7
 8#define FFS_NOWAIT		0x1UL
 9#define FFS_ISREG		0x2UL
10#define FFS_MASK		~(FFS_NOWAIT|FFS_ISREG)
11
12bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
13void io_free_file_tables(struct io_file_table *table);
14
15int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
16			struct file *file, unsigned int file_slot);
17int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
18				unsigned int file_slot);
19int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
20
21int io_register_file_alloc_range(struct io_ring_ctx *ctx,
22				 struct io_uring_file_index_range __user *arg);
23
24unsigned int io_file_get_flags(struct file *file);
25
26static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
27{
28	WARN_ON_ONCE(!test_bit(bit, table->bitmap));
29	__clear_bit(bit, table->bitmap);
30	table->alloc_hint = bit;
31}
32
33static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
34{
35	WARN_ON_ONCE(test_bit(bit, table->bitmap));
36	__set_bit(bit, table->bitmap);
37	table->alloc_hint = bit + 1;
38}
39
40static inline struct io_fixed_file *
41io_fixed_file_slot(struct io_file_table *table, unsigned i)
42{
43	return &table->files[i];
44}
45
46static inline struct file *io_file_from_index(struct io_file_table *table,
47					      int index)
48{
49	struct io_fixed_file *slot = io_fixed_file_slot(table, index);
50
51	return (struct file *) (slot->file_ptr & FFS_MASK);
52}
53
54static inline void io_fixed_file_set(struct io_fixed_file *file_slot,
55				     struct file *file)
56{
57	unsigned long file_ptr = (unsigned long) file;
58
59	file_ptr |= io_file_get_flags(file);
60	file_slot->file_ptr = file_ptr;
61}
62
63static inline void io_reset_alloc_hint(struct io_ring_ctx *ctx)
64{
65	ctx->file_table.alloc_hint = ctx->file_alloc_start;
66}
67
68static inline void io_file_table_set_alloc_range(struct io_ring_ctx *ctx,
69						 unsigned off, unsigned len)
70{
71	ctx->file_alloc_start = off;
72	ctx->file_alloc_end = off + len;
73	io_reset_alloc_hint(ctx);
74}
75
76#endif