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authorMing Lei <ming.lei@redhat.com>2018-09-05 15:45:54 -0600
committerJens Axboe <axboe@kernel.dk>2018-09-06 15:12:24 -0600
commit7759eb23fd9808a2e4498cf36a798ed65cde78ae (patch)
tree5ff1a0f21a48ee3f1c4eae4c2dbc7dd084e59792 /block/bio.c
parent3d0e63754fa47d65edff172c1156f44b6fca5ca1 (diff)
downloadlinux-7759eb23fd9808a2e4498cf36a798ed65cde78ae.tar.bz2
block: remove bio_rewind_iter()
It is pointed that bio_rewind_iter() is one very bad API[1]: 1) bio size may not be restored after rewinding 2) it causes some bogus change, such as 5151842b9d8732 (block: reset bi_iter.bi_done after splitting bio) 3) rewinding really makes things complicated wrt. bio splitting 4) unnecessary updating of .bi_done in fast path [1] https://marc.info/?t=153549924200005&r=1&w=2 So this patch takes Kent's suggestion to restore one bio into its original state via saving bio iterator(struct bvec_iter) in bio_integrity_prep(), given now bio_rewind_iter() is only used by bio integrity code. Cc: Dmitry Monakhov <dmonakhov@openvz.org> Cc: Hannes Reinecke <hare@suse.com> Suggested-by: Kent Overstreet <kent.overstreet@gmail.com> Acked-by: Kent Overstreet <kent.overstreet@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bio.c')
-rw-r--r--block/bio.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/block/bio.c b/block/bio.c
index 8c680a776171..f685e762809d 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1807,7 +1807,6 @@ struct bio *bio_split(struct bio *bio, int sectors,
bio_integrity_trim(split);
bio_advance(bio, split->bi_iter.bi_size);
- bio->bi_iter.bi_done = 0;
if (bio_flagged(bio, BIO_TRACE_COMPLETION))
bio_set_flag(split, BIO_TRACE_COMPLETION);