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authorKent Overstreet <kmo@daterainc.com>2014-02-11 05:45:50 +0400
committerJens Axboe <axboe@fb.com>2014-02-11 19:40:45 +0400
commit8423ae3d7a3cfe084865262cfaeba1359d405182 (patch)
treee8e6f9c31f5622e66ff176b600cf3b3c951eb4d8 /fs
parent9d4cb8e3a5b448d802155688bf2d50ac1b9e1a51 (diff)
downloadlinux-8423ae3d7a3cfe084865262cfaeba1359d405182.tar.xz
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 'fs')
-rw-r--r--fs/bio.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/fs/bio.c b/fs/bio.c
index 75c49a382239..8754e7b6eb49 100644
--- 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;