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authorKent Overstreet <kmo@daterainc.com>2014-01-16 15:04:18 -0800
committerKent Overstreet <kmo@daterainc.com>2014-02-25 18:41:11 -0800
commit1b4eaf3d3809a658c85911e92d9ff64086931efa (patch)
treeda491dc55af651888db6390f9a495f0c848f43c9 /drivers/md/bcache
parent85cbe1f88cb189322e3e4ef98816c19ab12161ea (diff)
downloadblackbird-op-linux-1b4eaf3d3809a658c85911e92d9ff64086931efa.tar.gz
blackbird-op-linux-1b4eaf3d3809a658c85911e92d9ff64086931efa.zip
bcache: Fix flash_dev_cache_miss() for real this time
The code was using sectors to count the number of sectors it was zeroing... but then it passed it to bio_advance()... after it had been set to 0. Amusing... Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Diffstat (limited to 'drivers/md/bcache')
-rw-r--r--drivers/md/bcache/request.c19
1 files changed, 5 insertions, 14 deletions
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 5d5d031cf381..fc14ba3f6d05 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -1203,22 +1203,13 @@ void bch_cached_dev_request_init(struct cached_dev *dc)
static int flash_dev_cache_miss(struct btree *b, struct search *s,
struct bio *bio, unsigned sectors)
{
- struct bio_vec bv;
- struct bvec_iter iter;
-
- /* Zero fill bio */
-
- bio_for_each_segment(bv, bio, iter) {
- unsigned j = min(bv.bv_len >> 9, sectors);
-
- void *p = kmap(bv.bv_page);
- memset(p + bv.bv_offset, 0, j << 9);
- kunmap(bv.bv_page);
+ unsigned bytes = min(sectors, bio_sectors(bio)) << 9;
- sectors -= j;
- }
+ swap(bio->bi_iter.bi_size, bytes);
+ zero_fill_bio(bio);
+ swap(bio->bi_iter.bi_size, bytes);
- bio_advance(bio, min(sectors << 9, bio->bi_iter.bi_size));
+ bio_advance(bio, bytes);
if (!bio->bi_iter.bi_size)
return MAP_DONE;
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