mm: clarify why we want kmalloc before falling backto vmallock

[karo-tx-linux.git] / block / bio.c

diff --git a/block/bio.c b/block/bio.c
index f4d2071802663f0264711edad40b9126fa1f1799..888e7801c6381edd8d995503643917b2f452282e 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -633,20 +633,21 @@ struct bio *bio_clone_fast(struct bio *bio, gfp_t gfp_mask, struct bio_set *bs)
 }
 EXPORT_SYMBOL(bio_clone_fast);
 
-static struct bio *__bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
-                                     struct bio_set *bs, int offset,
-                                     int size)
+/**
+ *     bio_clone_bioset - clone a bio
+ *     @bio_src: bio to clone
+ *     @gfp_mask: allocation priority
+ *     @bs: bio_set to allocate from
+ *
+ *     Clone bio. Caller will own the returned bio, but not the actual data it
+ *     points to. Reference count of returned bio will be one.
+ */
+struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
+                            struct bio_set *bs)
 {
        struct bvec_iter iter;
        struct bio_vec bv;
        struct bio *bio;
-       struct bvec_iter iter_src = bio_src->bi_iter;
-
-       /* for supporting partial clone */
-       if (offset || size != bio_src->bi_iter.bi_size) {
-               bio_advance_iter(bio_src, &iter_src, offset);
-               iter_src.bi_size = size;
-       }
 
        /*
         * Pre immutable biovecs, __bio_clone() used to just do a memcpy from
@@ -670,8 +671,7 @@ static struct bio *__bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
         *    __bio_clone_fast() anyways.
         */
 
-       bio = bio_alloc_bioset(gfp_mask, __bio_segments(bio_src,
-                              &iter_src), bs);
+       bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs);
        if (!bio)
                return NULL;
        bio->bi_bdev            = bio_src->bi_bdev;
@@ -688,7 +688,7 @@ static struct bio *__bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
                bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0];
                break;
        default:
-               __bio_for_each_segment(bv, bio_src, iter, iter_src)
+               bio_for_each_segment(bv, bio_src, iter)
                        bio->bi_io_vec[bio->bi_vcnt++] = bv;
                break;
        }
@@ -707,43 +707,8 @@ static struct bio *__bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
 
        return bio;
 }
-
-/**
- *     bio_clone_bioset - clone a bio
- *     @bio_src: bio to clone
- *     @gfp_mask: allocation priority
- *     @bs: bio_set to allocate from
- *
- *     Clone bio. Caller will own the returned bio, but not the actual data it
- *     points to. Reference count of returned bio will be one.
- */
-struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
-                            struct bio_set *bs)
-{
-       return __bio_clone_bioset(bio_src, gfp_mask, bs, 0,
-                                 bio_src->bi_iter.bi_size);
-}
 EXPORT_SYMBOL(bio_clone_bioset);
 
-/**
- *     bio_clone_bioset_partial - clone a partial bio
- *     @bio_src: bio to clone
- *     @gfp_mask: allocation priority
- *     @bs: bio_set to allocate from
- *     @offset: cloned starting from the offset
- *     @size: size for the cloned bio
- *
- *     Clone bio. Caller will own the returned bio, but not the actual data it
- *     points to. Reference count of returned bio will be one.
- */
-struct bio *bio_clone_bioset_partial(struct bio *bio_src, gfp_t gfp_mask,
-                                    struct bio_set *bs, int offset,
-                                    int size)
-{
-       return __bio_clone_bioset(bio_src, gfp_mask, bs, offset, size);
-}
-EXPORT_SYMBOL(bio_clone_bioset_partial);
-
 /**
  *     bio_add_pc_page -       attempt to add page to bio
  *     @q: the target queue