Quelle filetable.h Sprache: C

// SPDX-License-Identifier: GPL-2.0
#ifndef IOU_FILE_TABLE_H
#define IOU_FILE_TABLE_H

#include <linux/file.h>
#include <linux/io_uring_types.h>
#include "rsrc.h"

bool io_alloc_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table, unsigned nr_files);
void io_free_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table);

int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
   struct file *file, unsigned int file_slot);
int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
    unsigned int file_slot);
int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);

int io_register_file_alloc_range(struct io_ring_ctx *ctx,
     struct io_uring_file_index_range __user *arg);

io_req_flags_t io_file_get_flags(struct file *file);

static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
{
WARN_ON_ONCE(!test_bit(bit, table->bitmap));
__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;
}

#define FFS_NOWAIT  0x1UL
#define FFS_ISREG  0x2UL
#define FFS_MASK  ~(FFS_NOWAIT|FFS_ISREG)

static inline unsigned int io_slot_flags(struct io_rsrc_node *node)
{

return (node->file_ptr & ~FFS_MASK) << REQ_F_SUPPORT_NOWAIT_BIT;
}

static inline struct file *io_slot_file(struct io_rsrc_node *node)
{
return (struct file *)(node->file_ptr & FFS_MASK);
}

static inline void io_fixed_file_set(struct io_rsrc_node *node,
         struct file *file)
{
node->file_ptr = (unsigned long)file |
  (io_file_get_flags(file) >> REQ_F_SUPPORT_NOWAIT_BIT);
}

static inline void io_file_table_set_alloc_range(struct io_ring_ctx *ctx,
       unsigned off, unsigned len)
{
ctx->file_alloc_start = off;
ctx->file_alloc_end = off + len;
ctx->file_table.alloc_hint = ctx->file_alloc_start;
}

#endif

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