1453b329bSJens Axboe // SPDX-License-Identifier: GPL-2.0 2453b329bSJens Axboe #ifndef IOU_FILE_TABLE_H 3453b329bSJens Axboe #define IOU_FILE_TABLE_H 4453b329bSJens Axboe 5453b329bSJens Axboe struct io_ring_ctx; 6*c98817e6SJens Axboe struct io_kiocb; 7453b329bSJens Axboe 8453b329bSJens Axboe /* 9453b329bSJens Axboe * FFS_SCM is only available on 64-bit archs, for 32-bit we just define it as 0 10453b329bSJens Axboe * and define IO_URING_SCM_ALL. For this case, we use SCM for all files as we 11453b329bSJens Axboe * can't safely always dereference the file when the task has exited and ring 12453b329bSJens Axboe * cleanup is done. If a file is tracked and part of SCM, then unix gc on 13453b329bSJens Axboe * process exit may reap it before __io_sqe_files_unregister() is run. 14453b329bSJens Axboe */ 15453b329bSJens Axboe #define FFS_NOWAIT 0x1UL 16453b329bSJens Axboe #define FFS_ISREG 0x2UL 17453b329bSJens Axboe #if defined(CONFIG_64BIT) 18453b329bSJens Axboe #define FFS_SCM 0x4UL 19453b329bSJens Axboe #else 20453b329bSJens Axboe #define IO_URING_SCM_ALL 21453b329bSJens Axboe #define FFS_SCM 0x0UL 22453b329bSJens Axboe #endif 23453b329bSJens Axboe #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG|FFS_SCM) 24453b329bSJens Axboe 25453b329bSJens Axboe struct io_fixed_file { 26453b329bSJens Axboe /* file * with additional FFS_* flags */ 27453b329bSJens Axboe unsigned long file_ptr; 28453b329bSJens Axboe }; 29453b329bSJens Axboe 30453b329bSJens Axboe struct io_file_table { 31453b329bSJens Axboe struct io_fixed_file *files; 32453b329bSJens Axboe unsigned long *bitmap; 33453b329bSJens Axboe unsigned int alloc_hint; 34453b329bSJens Axboe }; 35453b329bSJens Axboe 36453b329bSJens Axboe bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files); 37453b329bSJens Axboe void io_free_file_tables(struct io_file_table *table); 38*c98817e6SJens Axboe 39*c98817e6SJens Axboe int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags, 40*c98817e6SJens Axboe struct file *file, unsigned int file_slot); 41453b329bSJens Axboe 42a4ad4f74SJens Axboe unsigned int io_file_get_flags(struct file *file); 43a4ad4f74SJens Axboe 44453b329bSJens Axboe static inline void io_file_bitmap_clear(struct io_file_table *table, int bit) 45453b329bSJens Axboe { 46453b329bSJens Axboe __clear_bit(bit, table->bitmap); 47453b329bSJens Axboe table->alloc_hint = bit; 48453b329bSJens Axboe } 49453b329bSJens Axboe 50453b329bSJens Axboe static inline void io_file_bitmap_set(struct io_file_table *table, int bit) 51453b329bSJens Axboe { 52453b329bSJens Axboe WARN_ON_ONCE(test_bit(bit, table->bitmap)); 53453b329bSJens Axboe __set_bit(bit, table->bitmap); 54453b329bSJens Axboe table->alloc_hint = bit + 1; 55453b329bSJens Axboe } 56453b329bSJens Axboe 57453b329bSJens Axboe static inline struct io_fixed_file * 58453b329bSJens Axboe io_fixed_file_slot(struct io_file_table *table, unsigned i) 59453b329bSJens Axboe { 60453b329bSJens Axboe return &table->files[i]; 61453b329bSJens Axboe } 62453b329bSJens Axboe 63a4ad4f74SJens Axboe static inline struct file *io_file_from_index(struct io_file_table *table, 64a4ad4f74SJens Axboe int index) 65a4ad4f74SJens Axboe { 66a4ad4f74SJens Axboe struct io_fixed_file *slot = io_fixed_file_slot(table, index); 67a4ad4f74SJens Axboe 68a4ad4f74SJens Axboe return (struct file *) (slot->file_ptr & FFS_MASK); 69a4ad4f74SJens Axboe } 70a4ad4f74SJens Axboe 71a4ad4f74SJens Axboe static inline void io_fixed_file_set(struct io_fixed_file *file_slot, 72a4ad4f74SJens Axboe struct file *file) 73a4ad4f74SJens Axboe { 74a4ad4f74SJens Axboe unsigned long file_ptr = (unsigned long) file; 75a4ad4f74SJens Axboe 76a4ad4f74SJens Axboe file_ptr |= io_file_get_flags(file); 77a4ad4f74SJens Axboe file_slot->file_ptr = file_ptr; 78a4ad4f74SJens Axboe } 79a4ad4f74SJens Axboe 80453b329bSJens Axboe #endif 81