Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus

[~andy/linux] / fs / bio.c

diff --git a/fs/bio.c b/fs/bio.c
index 75c49a38223969c1f7256868cb3b09fc7d3bd286..8754e7b6eb49330055a1efc69e86451fa9c65ff8 100644 (file)
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -611,7 +611,6 @@ EXPORT_SYMBOL(bio_clone_fast);
 struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
                             struct bio_set *bs)
 {
-       unsigned nr_iovecs = 0;
        struct bvec_iter iter;
        struct bio_vec bv;
        struct bio *bio;
@@ -638,10 +637,7 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
         *    __bio_clone_fast() anyways.
         */
 
-       bio_for_each_segment(bv, bio_src, iter)
-               nr_iovecs++;
-
-       bio = bio_alloc_bioset(gfp_mask, nr_iovecs, bs);
+       bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs);
        if (!bio)
                return NULL;
 
@@ -650,9 +646,18 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
        bio->bi_iter.bi_sector  = bio_src->bi_iter.bi_sector;
        bio->bi_iter.bi_size    = bio_src->bi_iter.bi_size;
 
+       if (bio->bi_rw & REQ_DISCARD)
+               goto integrity_clone;
+
+       if (bio->bi_rw & REQ_WRITE_SAME) {
+               bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0];
+               goto integrity_clone;
+       }
+
        bio_for_each_segment(bv, bio_src, iter)
                bio->bi_io_vec[bio->bi_vcnt++] = bv;
 
+integrity_clone:
        if (bio_integrity(bio_src)) {
                int ret;