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authorKent Overstreet <kmo@daterainc.com>2014-02-10 17:45:50 -0800
committerJens Axboe <axboe@fb.com>2014-02-11 08:40:45 -0700
commit8423ae3d7a3cfe084865262cfaeba1359d405182 (patch)
treee8e6f9c31f5622e66ff176b600cf3b3c951eb4d8 /include/linux
parent9d4cb8e3a5b448d802155688bf2d50ac1b9e1a51 (diff)
block: Fix cloning of discard/write same bios
Immutable biovecs changed the way bio segments are treated in such a way that bio_for_each_segment() cannot now do what we want for discard/write same bios, since bi_size means something completely different for them. Fortunately discard and write same bios never have more than a single biovec, so bio_for_each_segment() is unnecessary and not terribly meaningful for them, but we still have to special case them in a few places. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Tested-by: Richard W.M. Jones <rjones@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/bio.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h
index d6791bba8264..5a4d39b4686b 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -250,6 +250,17 @@ static inline unsigned bio_segments(struct bio *bio)
struct bio_vec bv;
struct bvec_iter iter;
+ /*
+ * We special case discard/write same, because they interpret bi_size
+ * differently:
+ */
+
+ if (bio->bi_rw & REQ_DISCARD)
+ return 1;
+
+ if (bio->bi_rw & REQ_WRITE_SAME)
+ return 1;
+
bio_for_each_segment(bv, bio, iter)
segs++;

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