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 bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
   9 void io_free_file_tables(struct io_file_table *table);
  10
  11 int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
  12                         struct file *file, unsigned int file_slot);
  13 int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
  14                                 unsigned int file_slot);
  15 int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
  16
  17 int io_register_file_alloc_range(struct io_ring_ctx *ctx,
  18                                  struct io_uring_file_index_range __user *arg);
  19
  20 unsigned int io_file_get_flags(struct file *file);
  21
  22 static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
  23 {
  24         WARN_ON_ONCE(!test_bit(bit, table->bitmap));
  25         __clear_bit(bit, table->bitmap);
  26         table->alloc_hint = bit;
  27 }
  28
  29 static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
  30 {
  31         WARN_ON_ONCE(test_bit(bit, table->bitmap));
  32         __set_bit(bit, table->bitmap);
  33         table->alloc_hint = bit + 1;
  34 }
  35
  36 static inline struct io_fixed_file *
  37 io_fixed_file_slot(struct io_file_table *table, unsigned i)
  38 {
  39         return &table->files[i];
  40 }
  41
  42 #define FFS_NOWAIT              0x1UL
  43 #define FFS_ISREG               0x2UL
  44 #define FFS_MASK                ~(FFS_NOWAIT|FFS_ISREG)
  45
  46 static inline unsigned int io_slot_flags(struct io_fixed_file *slot)
  47 {
  48         return (slot->file_ptr & ~FFS_MASK) << REQ_F_SUPPORT_NOWAIT_BIT;
  49 }
  50
  51 static inline struct file *io_slot_file(struct io_fixed_file *slot)
  52 {
  53         return (struct file *)(slot->file_ptr & FFS_MASK);
  54 }
  55
  56 static inline struct file *io_file_from_index(struct io_file_table *table,
  57                                               int index)
  58 {
  59         return io_slot_file(io_fixed_file_slot(table, index));
  60 }
  61
  62 static inline void io_fixed_file_set(struct io_fixed_file *file_slot,
  63                                      struct file *file)
  64 {
  65         file_slot->file_ptr = (unsigned long)file |
  66                 (io_file_get_flags(file) >> REQ_F_SUPPORT_NOWAIT_BIT);
  67 }
  68
  69 static inline void io_reset_alloc_hint(struct io_ring_ctx *ctx)
  70 {
  71         ctx->file_table.alloc_hint = ctx->file_alloc_start;
  72 }
  73
  74 static inline void io_file_table_set_alloc_range(struct io_ring_ctx *ctx,
  75                                                  unsigned off, unsigned len)
  76 {
  77         ctx->file_alloc_start = off;
  78         ctx->file_alloc_end = off + len;
  79         io_reset_alloc_hint(ctx);
  80 }
  81
  82 #endif