1 files changed, 30 insertions, 51 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index 82dc20621c06..3596ca71909b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -127,7 +127,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
         INIT_LIST_HEAD(&rq->timeout_list);
         rq->cpu = -1;
         rq->q = q;
-        rq->sector = rq->hard_sector = (sector_t) -1;
+        rq->sector = (sector_t) -1;
         INIT_HLIST_NODE(&rq->hash);
         RB_CLEAR_NODE(&rq->rb_node);
         rq->cmd = rq->__cmd;
@@ -189,8 +189,7 @@ void blk_dump_rq_flags(struct request *rq, char *msg)
                (unsigned long long)blk_rq_pos(rq),
                blk_rq_sectors(rq), blk_rq_cur_sectors(rq));
         printk(KERN_INFO "  bio %p, biotail %p, buffer %p, len %u\n",
-                                                rq->bio, rq->biotail,
-                                                rq->buffer, rq->data_len);
+               rq->bio, rq->biotail, rq->buffer, blk_rq_bytes(rq));
 
         if (blk_pc_request(rq)) {
                 printk(KERN_INFO "  cdb: ");
@@ -1096,7 +1095,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
                 req->cmd_flags |= REQ_NOIDLE;
 
         req->errors = 0;
-        req->hard_sector = req->sector = bio->bi_sector;
+        req->sector = bio->bi_sector;
         req->ioprio = bio_prio(bio);
         blk_rq_bio_prep(req->q, req, bio);
 }
@@ -1113,14 +1112,13 @@ static inline bool queue_should_plug(struct request_queue *q)
 static int __make_request(struct request_queue *q, struct bio *bio)
 {
         struct request *req;
-        int el_ret, nr_sectors;
+        int el_ret;
+        unsigned int bytes = bio->bi_size;
         const unsigned short prio = bio_prio(bio);
         const int sync = bio_sync(bio);
         const int unplug = bio_unplug(bio);
         int rw_flags;
 
-        nr_sectors = bio_sectors(bio);
-
         /*
          * low level driver can indicate that it wants pages above a
          * certain limit bounced to low memory (ie for highmem, or even
@@ -1145,7 +1143,7 @@ static int __make_request(struct request_queue *q, struct bio *bio)
 
                 req->biotail->bi_next = bio;
                 req->biotail = bio;
-                req->nr_sectors = req->hard_nr_sectors += nr_sectors;
+                req->data_len += bytes;
                 req->ioprio = ioprio_best(req->ioprio, prio);
                 if (!blk_rq_cpu_valid(req))
                         req->cpu = bio->bi_comp_cpu;
@@ -1171,10 +1169,8 @@ static int __make_request(struct request_queue *q, struct bio *bio)
                  * not touch req->buffer either...
                  */
                 req->buffer = bio_data(bio);
-                req->current_nr_sectors = bio_cur_sectors(bio);
-                req->hard_cur_sectors = req->current_nr_sectors;
-                req->sector = req->hard_sector = bio->bi_sector;
-                req->nr_sectors = req->hard_nr_sectors += nr_sectors;
+                req->sector = bio->bi_sector;
+                req->data_len += bytes;
                 req->ioprio = ioprio_best(req->ioprio, prio);
                 if (!blk_rq_cpu_valid(req))
                         req->cpu = bio->bi_comp_cpu;
@@ -1557,7 +1553,7 @@ EXPORT_SYMBOL(submit_bio);
 int blk_rq_check_limits(struct request_queue *q, struct request *rq)
 {
         if (blk_rq_sectors(rq) > q->max_sectors ||
-            rq->data_len > q->max_hw_sectors << 9) {
+            blk_rq_bytes(rq) > q->max_hw_sectors << 9) {
                 printk(KERN_ERR "%s: over max size limit.\n", __func__);
                 return -EIO;
         }
@@ -1675,35 +1671,6 @@ static void blk_account_io_done(struct request *req)
         }
 }
 
-/**
- * blk_rq_bytes - Returns bytes left to complete in the entire request
- * @rq: the request being processed
- **/
-unsigned int blk_rq_bytes(struct request *rq)
-{
-        if (blk_fs_request(rq))
-                return blk_rq_sectors(rq) << 9;
-
-        return rq->data_len;
-}
-EXPORT_SYMBOL_GPL(blk_rq_bytes);
-
-/**
- * blk_rq_cur_bytes - Returns bytes left to complete in the current segment
- * @rq: the request being processed
- **/
-unsigned int blk_rq_cur_bytes(struct request *rq)
-{
-        if (blk_fs_request(rq))
-                return rq->current_nr_sectors << 9;
-
-        if (rq->bio)
-                return rq->bio->bi_size;
-
-        return rq->data_len;
-}
-EXPORT_SYMBOL_GPL(blk_rq_cur_bytes);
-
 struct request *elv_next_request(struct request_queue *q)
 {
         struct request *rq;
@@ -1736,7 +1703,7 @@ struct request *elv_next_request(struct request_queue *q)
                 if (rq->cmd_flags & REQ_DONTPREP)
                         break;
 
-                if (q->dma_drain_size && rq->data_len) {
+                if (q->dma_drain_size && blk_rq_bytes(rq)) {
                         /*
                          * make sure space for the drain appears we
                          * know we can do this because max_hw_segments
@@ -1759,7 +1726,7 @@ struct request *elv_next_request(struct request_queue *q)
                          * avoid resource deadlock.  REQ_STARTED will
                          * prevent other fs requests from passing this one.
                          */
-                        if (q->dma_drain_size && rq->data_len &&
+                        if (q->dma_drain_size && blk_rq_bytes(rq) &&
                             !(rq->cmd_flags & REQ_DONTPREP)) {
                                 /*
                                  * remove the space for the drain we added
@@ -1911,8 +1878,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
                  * can find how many bytes remain in the request
                  * later.
                  */
-                req->nr_sectors = req->hard_nr_sectors = 0;
-                req->current_nr_sectors = req->hard_cur_sectors = 0;
+                req->data_len = 0;
                 return false;
         }
 
@@ -1926,8 +1892,25 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
                 bio_iovec(bio)->bv_len -= nr_bytes;
         }
 
-        blk_recalc_rq_sectors(req, total_bytes >> 9);
+        req->data_len -= total_bytes;
+        req->buffer = bio_data(req->bio);
+
+        /* update sector only for requests with clear definition of sector */
+        if (blk_fs_request(req) || blk_discard_rq(req))
+                req->sector += total_bytes >> 9;
+
+        /*
+         * If total number of sectors is less than the first segment
+         * size, something has gone terribly wrong.
+         */
+        if (blk_rq_bytes(req) < blk_rq_cur_bytes(req)) {
+                printk(KERN_ERR "blk: request botched\n");
+                req->data_len = blk_rq_cur_bytes(req);
+        }
+
+        /* recalculate the number of segments */
         blk_recalc_rq_segments(req);
+
         return true;
 }
 EXPORT_SYMBOL_GPL(blk_update_request);
@@ -2049,11 +2032,7 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
                 rq->nr_phys_segments = bio_phys_segments(q, bio);
                 rq->buffer = bio_data(bio);
         }
-        rq->current_nr_sectors = bio_cur_sectors(bio);
-        rq->hard_cur_sectors = rq->current_nr_sectors;
-        rq->hard_nr_sectors = rq->nr_sectors = bio_sectors(bio);
         rq->data_len = bio->bi_size;
-
         rq->bio = rq->biotail = bio;
 
         if (bio->bi_bdev)