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 #include "rsrc.h"
   8
   9 bool io_alloc_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table, unsigned nr_files);
  10 void io_free_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table);
  11
  12 int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
  13                         struct file *file, unsigned int file_slot);
  14 int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
  15                                 unsigned int file_slot);
  16 int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
  17
  18 int io_register_file_alloc_range(struct io_ring_ctx *ctx,
  19                                  struct io_uring_file_index_range __user *arg);
  20
  21 io_req_flags_t io_file_get_flags(struct file *file);
  22
  23 static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
  24 {
  25         WARN_ON_ONCE(!test_bit(bit, table->bitmap));
  26         __clear_bit(bit, table->bitmap);
  27         table->alloc_hint = bit;
  28 }
  29
  30 static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
  31 {
  32         WARN_ON_ONCE(test_bit(bit, table->bitmap));
  33         __set_bit(bit, table->bitmap);
  34         table->alloc_hint = bit + 1;
  35 }
  36
  37 #define FFS_NOWAIT              0x1UL
  38 #define FFS_ISREG               0x2UL
  39 #define FFS_MASK                ~(FFS_NOWAIT|FFS_ISREG)
  40
  41 static inline unsigned int io_slot_flags(struct io_rsrc_node *node)
  42 {
  43
  44         return (node->file_ptr & ~FFS_MASK) << REQ_F_SUPPORT_NOWAIT_BIT;
  45 }
  46
  47 static inline struct file *io_slot_file(struct io_rsrc_node *node)
  48 {
  49         return (struct file *)(node->file_ptr & FFS_MASK);
  50 }
  51
  52 static inline void io_fixed_file_set(struct io_rsrc_node *node,
  53                                      struct file *file)
  54 {
  55         node->file_ptr = (unsigned long)file |
  56                 (io_file_get_flags(file) >> REQ_F_SUPPORT_NOWAIT_BIT);
  57 }
  58
  59 static inline void io_file_table_set_alloc_range(struct io_ring_ctx *ctx,
  60                                                  unsigned off, unsigned len)
  61 {
  62         ctx->file_alloc_start = off;
  63         ctx->file_alloc_end = off + len;
  64         ctx->file_table.alloc_hint = ctx->file_alloc_start;
  65 }
  66
  67 #endif