src/libbio/bio.h

   1 #ifndef BIO_H
   2 #define BIO_H
   3
   4 #include <fs.h>
   5 #include <buffer_head.h>
   6 #include <types.h>
   7
   8 enum bio_type {
   9         BI_read,
  10         BI_write
  11 };
  12
  13 struct bio {
  14         sector_t                bi_sector;      /* first sector on disk of i/o operation */
  15         struct block_device     *bi_bdev;       /* pointer to the block descriptor device */
  16         blksize_t               bi_size;        /* size of data to transfer */
  17         struct bio_operations   *bi_ops;        /* set of operation pointers */
  18         enum bio_type           bi_type;        /* type of i/o operation */
  19         struct buffer_head      *bi_buff;       /* kernel buffer */
  20         bool                    bi_finished;    /* tells i/o finished or not */
  21 };
  22
  23 struct bio_operations {
  24         int (*read_block) (struct bio *bio);
  25         int (*write_block) (struct bio *bio);
  26 };
  27
  28 extern struct bio_operations biops;
  29
  30 extern void buffer_io(struct bio *bio);
  31
  32 #endif