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
12 bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
13 void io_free_file_tables(struct io_file_table *table);
14
15 int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
16 struct file *file, unsigned int file_slot);
17 int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
18 unsigned int file_slot);
19 int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
20
21 int io_register_file_alloc_range(struct io_ring_ctx *ctx,
22 struct io_uring_file_index_range __user *arg);
23
24 unsigned int io_file_get_flags(struct file *file);
25
io_file_bitmap_clear(struct io_file_table * table,int bit)26 static 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
io_file_bitmap_set(struct io_file_table * table,int bit)33 static 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
40 static inline struct io_fixed_file *
io_fixed_file_slot(struct io_file_table * table,unsigned i)41 io_fixed_file_slot(struct io_file_table *table, unsigned i)
42 {
43 return &table->files[i];
44 }
45
io_file_from_index(struct io_file_table * table,int index)46 static 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
io_fixed_file_set(struct io_fixed_file * file_slot,struct file * file)54 static 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
io_reset_alloc_hint(struct io_ring_ctx * ctx)63 static inline void io_reset_alloc_hint(struct io_ring_ctx *ctx)
64 {
65 ctx->file_table.alloc_hint = ctx->file_alloc_start;
66 }
67
io_file_table_set_alloc_range(struct io_ring_ctx * ctx,unsigned off,unsigned len)68 static 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
77