releases/4.14.60/block-reset-bi_iter.bi_done-after-splitting-bio.patch

   1 From 5151842b9d8732d4cbfa8400b40bff894f501b2f Mon Sep 17 00:00:00 2001
   2 From: Greg Edwards <gedwards@ddn.com>
   3 Date: Thu, 26 Jul 2018 14:39:37 -0400
   4 Subject: block: reset bi_iter.bi_done after splitting bio
   5
   6 From: Greg Edwards <gedwards@ddn.com>
   7
   8 commit 5151842b9d8732d4cbfa8400b40bff894f501b2f upstream.
   9
  10 After the bio has been updated to represent the remaining sectors, reset
  11 bi_done so bio_rewind_iter() does not rewind further than it should.
  12
  13 This resolves a bio_integrity_process() failure on reads where the
  14 original request was split.
  15
  16 Fixes: 63573e359d05 ("bio-integrity: Restore original iterator on verify stage")
  17 Signed-off-by: Greg Edwards <gedwards@ddn.com>
  18 Signed-off-by: Jens Axboe <axboe@kernel.dk>
  19 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  20
  21 ---
  22  block/bio.c |    1 +
  23  1 file changed, 1 insertion(+)
  24
  25 --- a/block/bio.c
  26 +++ b/block/bio.c
  27 @@ -1889,6 +1889,7 @@ struct bio *bio_split(struct bio *bio, i
  28                 bio_integrity_trim(split);
  29
  30         bio_advance(bio, split->bi_iter.bi_size);
  31 +       bio->bi_iter.bi_done = 0;
  32
  33         if (bio_flagged(bio, BIO_TRACE_COMPLETION))
  34                 bio_set_flag(split, BIO_TRACE_COMPLETION);