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// SPDX-License-Identifier: GPL-2.0
#ifndef IOU_FILE_TABLE_H
#define IOU_FILE_TABLE_H
struct io_ring_ctx;
/*
* FFS_SCM is only available on 64-bit archs, for 32-bit we just define it as 0
* and define IO_URING_SCM_ALL. For this case, we use SCM for all files as we
* can't safely always dereference the file when the task has exited and ring
* cleanup is done. If a file is tracked and part of SCM, then unix gc on
* process exit may reap it before __io_sqe_files_unregister() is run.
*/
#define FFS_NOWAIT 0x1UL
#define FFS_ISREG 0x2UL
#if defined(CONFIG_64BIT)
#define FFS_SCM 0x4UL
#else
#define IO_URING_SCM_ALL
#define FFS_SCM 0x0UL
#endif
#define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG|FFS_SCM)
struct io_fixed_file {
/* file * with additional FFS_* flags */
unsigned long file_ptr;
};
struct io_file_table {
struct io_fixed_file *files;
unsigned long *bitmap;
unsigned int alloc_hint;
};
bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
void io_free_file_tables(struct io_file_table *table);
int io_file_bitmap_get(struct io_ring_ctx *ctx);
unsigned int io_file_get_flags(struct file *file);
static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
{
__clear_bit(bit, table->bitmap);
table->alloc_hint = bit;
}
static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
{
WARN_ON_ONCE(test_bit(bit, table->bitmap));
__set_bit(bit, table->bitmap);
table->alloc_hint = bit + 1;
}
static inline struct io_fixed_file *
io_fixed_file_slot(struct io_file_table *table, unsigned i)
{
return &table->files[i];
}
static inline struct file *io_file_from_index(struct io_file_table *table,
int index)
{
struct io_fixed_file *slot = io_fixed_file_slot(table, index);
return (struct file *) (slot->file_ptr & FFS_MASK);
}
static inline void io_fixed_file_set(struct io_fixed_file *file_slot,
struct file *file)
{
unsigned long file_ptr = (unsigned long) file;
file_ptr |= io_file_get_flags(file);
file_slot->file_ptr = file_ptr;
}
#endif
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