io_uring/filetable.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 #ifndef IOU_FILE_TABLE_H
   3 #define IOU_FILE_TABLE_H
   4
   5 #include <linux/file.h>
   6 #include <linux/io_uring_types.h>
   7
   8 #define FFS_NOWAIT              0x1UL
   9 #define FFS_ISREG               0x2UL
  10 #define FFS_MASK                ~(FFS_NOWAIT|FFS_ISREG)
  11
  12 bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
  13 void io_free_file_tables(struct io_file_table *table);
  14
  15 int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
  16                         struct file *file, unsigned int file_slot);
  17 int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
  18                                 unsigned int file_slot);
  19 int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
  20
  21 int io_register_file_alloc_range(struct io_ring_ctx *ctx,
  22                                  struct io_uring_file_index_range __user *arg);
  23
  24 unsigned int io_file_get_flags(struct file *file);
  25
  26 static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
  27 {
  28         WARN_ON_ONCE(!test_bit(bit, table->bitmap));
  29         __clear_bit(bit, table->bitmap);
  30         table->alloc_hint = bit;
  31 }
  32
  33 static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
  34 {
  35         WARN_ON_ONCE(test_bit(bit, table->bitmap));
  36         __set_bit(bit, table->bitmap);
  37         table->alloc_hint = bit + 1;
  38 }
  39
  40 static inline struct io_fixed_file *
  41 io_fixed_file_slot(struct io_file_table *table, unsigned i)
  42 {
  43         return &table->files[i];
  44 }
  45
  46 static inline struct file *io_file_from_index(struct io_file_table *table,
  47                                               int index)
  48 {
  49         struct io_fixed_file *slot = io_fixed_file_slot(table, index);
  50
  51         return (struct file *) (slot->file_ptr & FFS_MASK);
  52 }
  53
  54 static inline void io_fixed_file_set(struct io_fixed_file *file_slot,
  55                                      struct file *file)
  56 {
  57         unsigned long file_ptr = (unsigned long) file;
  58
  59         file_ptr |= io_file_get_flags(file);
  60         file_slot->file_ptr = file_ptr;
  61 }
  62
  63 static inline void io_reset_alloc_hint(struct io_ring_ctx *ctx)
  64 {
  65         ctx->file_table.alloc_hint = ctx->file_alloc_start;
  66 }
  67
  68 static inline void io_file_table_set_alloc_range(struct io_ring_ctx *ctx,
  69                                                  unsigned off, unsigned len)
  70 {
  71         ctx->file_alloc_start = off;
  72         ctx->file_alloc_end = off + len;
  73         io_reset_alloc_hint(ctx);
  74 }
  75
  76 #endif