dm bio record: save/restore bi_end_io and bi_integrity

Also, save/restore __bi_remaining in case the bio was used in a
BIO_CHAIN (e.g. due to blk_queue_split).

Suggested-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-bio-record.h b/drivers/md/dm-bio-record.h
index c82578af56a5bbff035a272f258327a7fce6ecfd..2ea0360108e1d41b57a39b5c5df715c52a641442 100644 (file)
--- a/drivers/md/dm-bio-record.h
+++ b/drivers/md/dm-bio-record.h
@@ -20,8 +20,13 @@
 struct dm_bio_details {
        struct gendisk *bi_disk;
        u8 bi_partno;
+       int __bi_remaining;
        unsigned long bi_flags;
        struct bvec_iter bi_iter;
+       bio_end_io_t *bi_end_io;
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
+       struct bio_integrity_payload *bi_integrity;
+#endif
 };
 
 static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
@@ -30,6 +35,11 @@ static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
        bd->bi_partno = bio->bi_partno;
        bd->bi_flags = bio->bi_flags;
        bd->bi_iter = bio->bi_iter;
+       bd->__bi_remaining = atomic_read(&bio->__bi_remaining);
+       bd->bi_end_io = bio->bi_end_io;
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
+       bd->bi_integrity = bio_integrity(bio);
+#endif
 }
 
 static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
@@ -38,6 +48,11 @@ static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
        bio->bi_partno = bd->bi_partno;
        bio->bi_flags = bd->bi_flags;
        bio->bi_iter = bd->bi_iter;
+       atomic_set(&bio->__bi_remaining, bd->__bi_remaining);
+       bio->bi_end_io = bd->bi_end_io;
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
+       bio->bi_integrity = bd->bi_integrity;
+#endif
 }
 
 #endif