Merge branch 'linus' into core/printk

[sfrench/cifs-2.6.git] / block / blk-merge.c

diff --git a/block/blk-merge.c b/block/blk-merge.c
index b92f5b0866b0972b80e5b7f69e1fae046608a90b..5a244f05360f5ca67592e29a7270f3874bf16c37 100644 (file)
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -38,72 +38,77 @@ void blk_recalc_rq_sectors(struct request *rq, int nsect)
        }
 }
 
-void blk_recalc_rq_segments(struct request *rq)
+static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
+                                            struct bio *bio)
 {
-       int nr_phys_segs;
        unsigned int phys_size;
        struct bio_vec *bv, *bvprv = NULL;
-       int seg_size;
-       int cluster;
-       struct req_iterator iter;
-       int high, highprv = 1;
-       struct request_queue *q = rq->q;
+       int cluster, i, high, highprv = 1;
+       unsigned int seg_size, nr_phys_segs;
+       struct bio *fbio, *bbio;
 
-       if (!rq->bio)
-               return;
+       if (!bio)
+               return 0;
 
+       fbio = bio;
        cluster = test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
        seg_size = 0;
        phys_size = nr_phys_segs = 0;
-       rq_for_each_segment(bv, rq, iter) {
-               /*
-                * the trick here is making sure that a high page is never
-                * considered part of another segment, since that might
-                * change with the bounce page.
-                */
-               high = page_to_pfn(bv->bv_page) > q->bounce_pfn;
-               if (high || highprv)
-                       goto new_segment;
-               if (cluster) {
-                       if (seg_size + bv->bv_len > q->max_segment_size)
-                               goto new_segment;
-                       if (!BIOVEC_PHYS_MERGEABLE(bvprv, bv))
-                               goto new_segment;
-                       if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bv))
+       for_each_bio(bio) {
+               bio_for_each_segment(bv, bio, i) {
+                       /*
+                        * the trick here is making sure that a high page is
+                        * never considered part of another segment, since that
+                        * might change with the bounce page.
+                        */
+                       high = page_to_pfn(bv->bv_page) > q->bounce_pfn;
+                       if (high || highprv)
                                goto new_segment;
+                       if (cluster) {
+                               if (seg_size + bv->bv_len > q->max_segment_size)
+                                       goto new_segment;
+                               if (!BIOVEC_PHYS_MERGEABLE(bvprv, bv))
+                                       goto new_segment;
+                               if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bv))
+                                       goto new_segment;
+
+                               seg_size += bv->bv_len;
+                               bvprv = bv;
+                               continue;
+                       }
+new_segment:
+                       if (nr_phys_segs == 1 && seg_size >
+                           fbio->bi_seg_front_size)
+                               fbio->bi_seg_front_size = seg_size;
 
-                       seg_size += bv->bv_len;
+                       nr_phys_segs++;
                        bvprv = bv;
-                       continue;
+                       seg_size = bv->bv_len;
+                       highprv = high;
                }
-new_segment:
-               if (nr_phys_segs == 1 && seg_size > rq->bio->bi_seg_front_size)
-                       rq->bio->bi_seg_front_size = seg_size;
-
-               nr_phys_segs++;
-               bvprv = bv;
-               seg_size = bv->bv_len;
-               highprv = high;
+               bbio = bio;
        }
 
-       if (nr_phys_segs == 1 && seg_size > rq->bio->bi_seg_front_size)
-               rq->bio->bi_seg_front_size = seg_size;
-       if (seg_size > rq->biotail->bi_seg_back_size)
-               rq->biotail->bi_seg_back_size = seg_size;
+       if (nr_phys_segs == 1 && seg_size > fbio->bi_seg_front_size)
+               fbio->bi_seg_front_size = seg_size;
+       if (seg_size > bbio->bi_seg_back_size)
+               bbio->bi_seg_back_size = seg_size;
+
+       return nr_phys_segs;
+}
 
-       rq->nr_phys_segments = nr_phys_segs;
+void blk_recalc_rq_segments(struct request *rq)
+{
+       rq->nr_phys_segments = __blk_recalc_rq_segments(rq->q, rq->bio);
 }
 
 void blk_recount_segments(struct request_queue *q, struct bio *bio)
 {
-       struct request rq;
        struct bio *nxt = bio->bi_next;
-       rq.q = q;
-       rq.bio = rq.biotail = bio;
+
        bio->bi_next = NULL;
-       blk_recalc_rq_segments(&rq);
+       bio->bi_phys_segments = __blk_recalc_rq_segments(q, bio);
        bio->bi_next = nxt;
-       bio->bi_phys_segments = rq.nr_phys_segments;
        bio->bi_flags |= (1 << BIO_SEG_VALID);
 }
 EXPORT_SYMBOL(blk_recount_segments);