| 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 |