LXR linux/drivers/md/dm-bio-record.h

   1/*
   2 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
   3 *
   4 * This file is released under the GPL.
   5 */
   6
   7#ifndef DM_BIO_RECORD_H
   8#define DM_BIO_RECORD_H
   9
  10#include <linux/bio.h>
  11
  12/*
  13 * There are lots of mutable fields in the bio struct that get
  14 * changed by the lower levels of the block layer.  Some targets,
  15 * such as multipath, may wish to resubmit a bio on error.  The
  16 * functions in this file help the target record and restore the
  17 * original bio state.
  18 */
  19
  20struct dm_bio_details {
  21        struct block_device *bi_bdev;
  22        unsigned long bi_flags;
  23        struct bvec_iter bi_iter;
  24};
  25
  26static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
  27{
  28        bd->bi_bdev = bio->bi_bdev;
  29        bd->bi_flags = bio->bi_flags;
  30        bd->bi_iter = bio->bi_iter;
  31}
  32
  33static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
  34{
  35        bio->bi_bdev = bd->bi_bdev;
  36        bio->bi_flags = bd->bi_flags;
  37        bio->bi_iter = bd->bi_iter;
  38}
  39
  40#endif
  41