1 // SPDX-License-Identifier: GPL-2.0
2 #ifndef IOU_FILE_TABLE_H
3 #define IOU_FILE_TABLE_H
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.
15 #define FFS_NOWAIT 0x1UL
16 #define FFS_ISREG 0x2UL
17 #if defined(CONFIG_64BIT)
20 #define IO_URING_SCM_ALL
23 #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG|FFS_SCM)
25 struct io_fixed_file {
26 /* file * with additional FFS_* flags */
27 unsigned long file_ptr;
30 struct io_file_table {
31 struct io_fixed_file *files;
32 unsigned long *bitmap;
33 unsigned int alloc_hint;
36 bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
37 void io_free_file_tables(struct io_file_table *table);
39 int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
40 struct file *file, unsigned int file_slot);
42 unsigned int io_file_get_flags(struct file *file);
44 static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
46 __clear_bit(bit, table->bitmap);
47 table->alloc_hint = bit;
50 static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
52 WARN_ON_ONCE(test_bit(bit, table->bitmap));
53 __set_bit(bit, table->bitmap);
54 table->alloc_hint = bit + 1;
57 static inline struct io_fixed_file *
58 io_fixed_file_slot(struct io_file_table *table, unsigned i)
60 return &table->files[i];
63 static inline struct file *io_file_from_index(struct io_file_table *table,
66 struct io_fixed_file *slot = io_fixed_file_slot(table, index);
68 return (struct file *) (slot->file_ptr & FFS_MASK);
71 static inline void io_fixed_file_set(struct io_fixed_file *file_slot,
74 unsigned long file_ptr = (unsigned long) file;
76 file_ptr |= io_file_get_flags(file);
77 file_slot->file_ptr = file_ptr;