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