drivers/md/dm-bio-record.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
   4  *
   5  * This file is released under the GPL.
   6  */
   7
   8 #ifndef DM_BIO_RECORD_H
   9 #define DM_BIO_RECORD_H
  10
  11 #include <linux/bio.h>
  12 #include <linux/blk-integrity.h>
  13
  14 /*
  15  * There are lots of mutable fields in the bio struct that get
  16  * changed by the lower levels of the block layer.  Some targets,
  17  * such as multipath, may wish to resubmit a bio on error.  The
  18  * functions in this file help the target record and restore the
  19  * original bio state.
  20  */
  21
  22 struct dm_bio_details {
  23         struct block_device *bi_bdev;
  24         int __bi_remaining;
  25         unsigned long bi_flags;
  26         struct bvec_iter bi_iter;
  27         bio_end_io_t *bi_end_io;
  28 #if defined(CONFIG_BLK_DEV_INTEGRITY)
  29         struct bio_integrity_payload *bi_integrity;
  30 #endif
  31 };
  32
  33 static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
  34 {
  35         bd->bi_bdev = bio->bi_bdev;
  36         bd->bi_flags = bio->bi_flags;
  37         bd->bi_iter = bio->bi_iter;
  38         bd->__bi_remaining = atomic_read(&bio->__bi_remaining);
  39         bd->bi_end_io = bio->bi_end_io;
  40 #if defined(CONFIG_BLK_DEV_INTEGRITY)
  41         bd->bi_integrity = bio_integrity(bio);
  42 #endif
  43 }
  44
  45 static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
  46 {
  47         bio->bi_bdev = bd->bi_bdev;
  48         bio->bi_flags = bd->bi_flags;
  49         bio->bi_iter = bd->bi_iter;
  50         atomic_set(&bio->__bi_remaining, bd->__bi_remaining);
  51         bio->bi_end_io = bd->bi_end_io;
  52 #if defined(CONFIG_BLK_DEV_INTEGRITY)
  53         bio->bi_integrity = bd->bi_integrity;
  54 #endif
  55 }
  56
  57 #endif