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453b329b JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #ifndef IOU_FILE_TABLE_H | |
3 | #define IOU_FILE_TABLE_H | |
4 | ||
5 | struct io_ring_ctx; | |
6 | ||
7 | /* | |
8 | * FFS_SCM is only available on 64-bit archs, for 32-bit we just define it as 0 | |
9 | * and define IO_URING_SCM_ALL. For this case, we use SCM for all files as we | |
10 | * can't safely always dereference the file when the task has exited and ring | |
11 | * cleanup is done. If a file is tracked and part of SCM, then unix gc on | |
12 | * process exit may reap it before __io_sqe_files_unregister() is run. | |
13 | */ | |
14 | #define FFS_NOWAIT 0x1UL | |
15 | #define FFS_ISREG 0x2UL | |
16 | #if defined(CONFIG_64BIT) | |
17 | #define FFS_SCM 0x4UL | |
18 | #else | |
19 | #define IO_URING_SCM_ALL | |
20 | #define FFS_SCM 0x0UL | |
21 | #endif | |
22 | #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG|FFS_SCM) | |
23 | ||
24 | struct io_fixed_file { | |
25 | /* file * with additional FFS_* flags */ | |
26 | unsigned long file_ptr; | |
27 | }; | |
28 | ||
29 | struct io_file_table { | |
30 | struct io_fixed_file *files; | |
31 | unsigned long *bitmap; | |
32 | unsigned int alloc_hint; | |
33 | }; | |
34 | ||
35 | bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files); | |
36 | void io_free_file_tables(struct io_file_table *table); | |
37 | int io_file_bitmap_get(struct io_ring_ctx *ctx); | |
38 | ||
39 | static inline void io_file_bitmap_clear(struct io_file_table *table, int bit) | |
40 | { | |
41 | __clear_bit(bit, table->bitmap); | |
42 | table->alloc_hint = bit; | |
43 | } | |
44 | ||
45 | static inline void io_file_bitmap_set(struct io_file_table *table, int bit) | |
46 | { | |
47 | WARN_ON_ONCE(test_bit(bit, table->bitmap)); | |
48 | __set_bit(bit, table->bitmap); | |
49 | table->alloc_hint = bit + 1; | |
50 | } | |
51 | ||
52 | static inline struct io_fixed_file * | |
53 | io_fixed_file_slot(struct io_file_table *table, unsigned i) | |
54 | { | |
55 | return &table->files[i]; | |
56 | } | |
57 | ||
58 | #endif |