| 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 | |
| 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 | |
| 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 * |
| 41 | io_fixed_file_slot(struct io_file_table *table, unsigned i) |
| 42 | { |
| 43 | return &table->files[i]; |
| 44 | } |
| 45 | |
| 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 | |
| 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 | |
| 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 | |
| 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 |