block: Add bio_for_each_segment_all()
__bio_for_each_segment() iterates bvecs from the specified index
instead of bio->bv_idx. Currently, the only usage is to walk all the
bvecs after the bio has been advanced by specifying 0 index.
For immutable bvecs, we need to split these apart;
bio_for_each_segment() is going to have a different implementation.
This will also help document the intent of code that's using it -
bio_for_each_segment_all() is only legal to use for code that owns the
bio.
Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: Neil Brown <neilb@suse.de>
CC: Boaz Harrosh <bharrosh@panasas.com>
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 6c81a4c..11e1798 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -952,7 +952,7 @@
/* Find first affected segment... */
resid = offset;
- __bio_for_each_segment(bv, bio_src, idx, 0) {
+ bio_for_each_segment(bv, bio_src, idx) {
if (resid < bv->bv_len)
break;
resid -= bv->bv_len;