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
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
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 *
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
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
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
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
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
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
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
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