Line data    Source code

       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           0 : static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
      23             : {
      24           0 :         WARN_ON_ONCE(!test_bit(bit, table->bitmap));
      25           0 :         __clear_bit(bit, table->bitmap);
      26           0 :         table->alloc_hint = bit;
      27           0 : }
      28             : 
      29           0 : static inline void io_file_bitmap_set(struct io_file_table *table, int bit)
      30             : {
      31           0 :         WARN_ON_ONCE(test_bit(bit, table->bitmap));
      32           0 :         __set_bit(bit, table->bitmap);
      33           0 :         table->alloc_hint = bit + 1;
      34           0 : }
      35             : 
      36             : static inline struct io_fixed_file *
      37             : io_fixed_file_slot(struct io_file_table *table, unsigned i)
      38             : {
      39           0 :         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           0 :         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           0 :         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           0 :         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           0 :         file_slot->file_ptr = (unsigned long)file |
      66           0 :                 (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           0 :         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           0 :         ctx->file_alloc_start = off;
      78           0 :         ctx->file_alloc_end = off + len;
      79           0 :         io_reset_alloc_hint(ctx);
      80             : }
      81             : 
      82             : #endif