Branch data     Line data    Source code

       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                 :            : 
      20                 :            : struct dm_bio_details {
      21                 :            :         struct gendisk *bi_disk;
      22                 :            :         u8 bi_partno;
      23                 :            :         int __bi_remaining;
      24                 :            :         unsigned long bi_flags;
      25                 :            :         struct bvec_iter bi_iter;
      26                 :            :         bio_end_io_t *bi_end_io;
      27                 :            : #if defined(CONFIG_BLK_DEV_INTEGRITY)
      28                 :            :         struct bio_integrity_payload *bi_integrity;
      29                 :            : #endif
      30                 :            : };
      31                 :            : 
      32                 :          0 : static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
      33                 :            : {
      34                 :          0 :         bd->bi_disk = bio->bi_disk;
      35                 :          0 :         bd->bi_partno = bio->bi_partno;
      36                 :          0 :         bd->bi_flags = bio->bi_flags;
      37                 :          0 :         bd->bi_iter = bio->bi_iter;
      38                 :          0 :         bd->__bi_remaining = atomic_read(&bio->__bi_remaining);
      39                 :          0 :         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                 :          0 : }
      44                 :            : 
      45                 :          0 : static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
      46                 :            : {
      47                 :          0 :         bio->bi_disk = bd->bi_disk;
      48                 :          0 :         bio->bi_partno = bd->bi_partno;
      49                 :          0 :         bio->bi_flags = bd->bi_flags;
      50                 :          0 :         bio->bi_iter = bd->bi_iter;
      51                 :          0 :         atomic_set(&bio->__bi_remaining, bd->__bi_remaining);
      52                 :          0 :         bio->bi_end_io = bd->bi_end_io;
      53                 :            : #if defined(CONFIG_BLK_DEV_INTEGRITY)
      54                 :            :         bio->bi_integrity = bd->bi_integrity;
      55                 :            : #endif
      56                 :          0 : }
      57                 :            : 
      58                 :            : #endif