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  bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
9  void io_free_file_tables(struct io_file_table *table);
10  
11  int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
12  			struct file *file, unsigned int file_slot);
13  int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
14  				unsigned int file_slot);
15  int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
16  
17  int io_register_file_alloc_range(struct io_ring_ctx *ctx,
18  				 struct io_uring_file_index_range __user *arg);
19  
20  io_req_flags_t io_file_get_flags(struct file *file);
21  
io_file_bitmap_clear(struct io_file_table * table,int bit)22  static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
23  {
24  	WARN_ON_ONCE(!test_bit(bit, table->bitmap));
25  	__clear_bit(bit, table->bitmap);
26  	table->alloc_hint = bit;
27  }
28  
io_file_bitmap_set(struct io_file_table * table,int bit)29  static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
30  {
31  	WARN_ON_ONCE(test_bit(bit, table->bitmap));
32  	__set_bit(bit, table->bitmap);
33  	table->alloc_hint = bit + 1;
34  }
35  
36  static inline struct io_fixed_file *
io_fixed_file_slot(struct io_file_table * table,unsigned i)37  io_fixed_file_slot(struct io_file_table *table, unsigned i)
38  {
39  	return &table->files[i];
40  }
41  
42  #define FFS_NOWAIT		0x1UL
43  #define FFS_ISREG		0x2UL
44  #define FFS_MASK		~(FFS_NOWAIT|FFS_ISREG)
45  
io_slot_flags(struct io_fixed_file * slot)46  static inline unsigned int io_slot_flags(struct io_fixed_file *slot)
47  {
48  	return (slot->file_ptr & ~FFS_MASK) << REQ_F_SUPPORT_NOWAIT_BIT;
49  }
50  
io_slot_file(struct io_fixed_file * slot)51  static inline struct file *io_slot_file(struct io_fixed_file *slot)
52  {
53  	return (struct file *)(slot->file_ptr & FFS_MASK);
54  }
55  
io_file_from_index(struct io_file_table * table,int index)56  static inline struct file *io_file_from_index(struct io_file_table *table,
57  					      int index)
58  {
59  	return io_slot_file(io_fixed_file_slot(table, index));
60  }
61  
io_fixed_file_set(struct io_fixed_file * file_slot,struct file * file)62  static inline void io_fixed_file_set(struct io_fixed_file *file_slot,
63  				     struct file *file)
64  {
65  	file_slot->file_ptr = (unsigned long)file |
66  		(io_file_get_flags(file) >> REQ_F_SUPPORT_NOWAIT_BIT);
67  }
68  
io_reset_alloc_hint(struct io_ring_ctx * ctx)69  static inline void io_reset_alloc_hint(struct io_ring_ctx *ctx)
70  {
71  	ctx->file_table.alloc_hint = ctx->file_alloc_start;
72  }
73  
io_file_table_set_alloc_range(struct io_ring_ctx * ctx,unsigned off,unsigned len)74  static inline void io_file_table_set_alloc_range(struct io_ring_ctx *ctx,
75  						 unsigned off, unsigned len)
76  {
77  	ctx->file_alloc_start = off;
78  	ctx->file_alloc_end = off + len;
79  	io_reset_alloc_hint(ctx);
80  }
81  
82  #endif
83