1 // SPDX-License-Identifier: GPL-2.0
2 #ifndef IOU_FILE_TABLE_H
3 #define IOU_FILE_TABLE_H
5 #include <linux/file.h>
11 * FFS_SCM is only available on 64-bit archs, for 32-bit we just define it as 0
12 * and define IO_URING_SCM_ALL. For this case, we use SCM for all files as we
13 * can't safely always dereference the file when the task has exited and ring
14 * cleanup is done. If a file is tracked and part of SCM, then unix gc on
15 * process exit may reap it before __io_sqe_files_unregister() is run.
17 #define FFS_NOWAIT 0x1UL
18 #define FFS_ISREG 0x2UL
19 #if defined(CONFIG_64BIT)
22 #define IO_URING_SCM_ALL
25 #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG|FFS_SCM)
27 bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
28 void io_free_file_tables(struct io_file_table *table);
30 int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
31 struct file *file, unsigned int file_slot);
32 int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
33 unsigned int file_slot);
34 int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
36 unsigned int io_file_get_flags(struct file *file);
38 static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
40 __clear_bit(bit, table->bitmap);
41 table->alloc_hint = bit;
44 static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
46 WARN_ON_ONCE(test_bit(bit, table->bitmap));
47 __set_bit(bit, table->bitmap);
48 table->alloc_hint = bit + 1;
51 static inline struct io_fixed_file *
52 io_fixed_file_slot(struct io_file_table *table, unsigned i)
54 return &table->files[i];
57 static inline struct file *io_file_from_index(struct io_file_table *table,
60 struct io_fixed_file *slot = io_fixed_file_slot(table, index);
62 return (struct file *) (slot->file_ptr & FFS_MASK);
65 static inline void io_fixed_file_set(struct io_fixed_file *file_slot,
68 unsigned long file_ptr = (unsigned long) file;
70 file_ptr |= io_file_get_flags(file);
71 file_slot->file_ptr = file_ptr;