| 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 | struct io_kiocb; |
| 7 | |
| 8 | /* |
| 9 | * FFS_SCM is only available on 64-bit archs, for 32-bit we just define it as 0 |
| 10 | * and define IO_URING_SCM_ALL. For this case, we use SCM for all files as we |
| 11 | * can't safely always dereference the file when the task has exited and ring |
| 12 | * cleanup is done. If a file is tracked and part of SCM, then unix gc on |
| 13 | * process exit may reap it before __io_sqe_files_unregister() is run. |
| 14 | */ |
| 15 | #define FFS_NOWAIT 0x1UL |
| 16 | #define FFS_ISREG 0x2UL |
| 17 | #if defined(CONFIG_64BIT) |
| 18 | #define FFS_SCM 0x4UL |
| 19 | #else |
| 20 | #define IO_URING_SCM_ALL |
| 21 | #define FFS_SCM 0x0UL |
| 22 | #endif |
| 23 | #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG|FFS_SCM) |
| 24 | |
| 25 | bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files); |
| 26 | void io_free_file_tables(struct io_file_table *table); |
| 27 | |
| 28 | int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags, |
| 29 | struct file *file, unsigned int file_slot); |
| 30 | |
| 31 | unsigned int io_file_get_flags(struct file *file); |
| 32 | |
| 33 | static inline void io_file_bitmap_clear(struct io_file_table *table, int bit) |
| 34 | { |
| 35 | __clear_bit(bit, table->bitmap); |
| 36 | table->alloc_hint = bit; |
| 37 | } |
| 38 | |
| 39 | static inline void io_file_bitmap_set(struct io_file_table *table, int bit) |
| 40 | { |
| 41 | WARN_ON_ONCE(test_bit(bit, table->bitmap)); |
| 42 | __set_bit(bit, table->bitmap); |
| 43 | table->alloc_hint = bit + 1; |
| 44 | } |
| 45 | |
| 46 | static inline struct io_fixed_file * |
| 47 | io_fixed_file_slot(struct io_file_table *table, unsigned i) |
| 48 | { |
| 49 | return &table->files[i]; |
| 50 | } |
| 51 | |
| 52 | static inline struct file *io_file_from_index(struct io_file_table *table, |
| 53 | int index) |
| 54 | { |
| 55 | struct io_fixed_file *slot = io_fixed_file_slot(table, index); |
| 56 | |
| 57 | return (struct file *) (slot->file_ptr & FFS_MASK); |
| 58 | } |
| 59 | |
| 60 | static inline void io_fixed_file_set(struct io_fixed_file *file_slot, |
| 61 | struct file *file) |
| 62 | { |
| 63 | unsigned long file_ptr = (unsigned long) file; |
| 64 | |
| 65 | file_ptr |= io_file_get_flags(file); |
| 66 | file_slot->file_ptr = file_ptr; |
| 67 | } |
| 68 | |
| 69 | #endif |