3 files changed, 20 insertions, 25 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index f37ca8c726ba..d30ec6f30dd7 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -218,12 +218,12 @@ struct bio {
 #define bio_sectors(bio)        ((bio)->bi_size >> 9)
 #define bio_empty_barrier(bio)  (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
 
-static inline unsigned int bio_cur_sectors(struct bio *bio)
+static inline unsigned int bio_cur_bytes(struct bio *bio)
 {
         if (bio->bi_vcnt)
-                return bio_iovec(bio)->bv_len >> 9;
+                return bio_iovec(bio)->bv_len;
         else /* dataless requests such as discard */
-                return bio->bi_size >> 9;
+                return bio->bi_size;
 }
 
 static inline void *bio_data(struct bio *bio)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 4e5f85598728..ce2bf5efa9ba 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -166,19 +166,8 @@ struct request {
         enum rq_cmd_type_bits cmd_type;
         unsigned long atomic_flags;
 
-        /* Maintain bio traversal state for part by part I/O submission.
-         * hard_* are block layer internals, no driver should touch them!
-         */
-
-        sector_t sector;                /* next sector to submit */
-        sector_t hard_sector;           /* next sector to complete */
-        unsigned long nr_sectors;       /* no. of sectors left to submit */
-        unsigned long hard_nr_sectors;  /* no. of sectors left to complete */
-        /* no. of sectors left to submit in the current segment */
-        unsigned int current_nr_sectors;
-
-        /* no. of sectors left to complete in the current segment */
-        unsigned int hard_cur_sectors;
+        sector_t sector;        /* sector cursor */
+        unsigned int data_len;  /* total data len, don't access directly */
 
         struct bio *bio;
         struct bio *biotail;
@@ -226,7 +215,6 @@ struct request {
         unsigned char __cmd[BLK_MAX_CDB];
         unsigned char *cmd;
 
-        unsigned int data_len;
         unsigned int extra_len; /* length of alignment and padding */
         unsigned int sense_len;
         unsigned int resid_len; /* residual count */
@@ -840,20 +828,27 @@ extern void blkdev_dequeue_request(struct request *req);
  */
 static inline sector_t blk_rq_pos(const struct request *rq)
 {
-        return rq->hard_sector;
+        return rq->sector;
+}
+
+static inline unsigned int blk_rq_bytes(const struct request *rq)
+{
+        return rq->data_len;
 }
 
-extern unsigned int blk_rq_bytes(struct request *rq);
-extern unsigned int blk_rq_cur_bytes(struct request *rq);
+static inline int blk_rq_cur_bytes(const struct request *rq)
+{
+        return rq->bio ? bio_cur_bytes(rq->bio) : 0;
+}
 
 static inline unsigned int blk_rq_sectors(const struct request *rq)
 {
-        return rq->hard_nr_sectors;
+        return blk_rq_bytes(rq) >> 9;
 }
 
 static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
 {
-        return rq->hard_cur_sectors;
+        return blk_rq_cur_bytes(rq) >> 9;
 }
 
 /*
@@ -928,7 +923,7 @@ static inline void blk_end_request_all(struct request *rq, int error)
  */
 static inline bool blk_end_request_cur(struct request *rq, int error)
 {
-        return blk_end_request(rq, error, rq->hard_cur_sectors << 9);
+        return blk_end_request(rq, error, blk_rq_cur_bytes(rq));
 }
 
 /**
@@ -981,7 +976,7 @@ static inline void __blk_end_request_all(struct request *rq, int error)
  */
 static inline bool __blk_end_request_cur(struct request *rq, int error)
 {
-        return __blk_end_request(rq, error, rq->hard_cur_sectors << 9);
+        return __blk_end_request(rq, error, blk_rq_cur_bytes(rq));
 }
 
 extern void blk_complete_request(struct request *);
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index c59b769f62b0..4e462878c9ca 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -171,7 +171,7 @@ enum {
         ELV_MQUEUE_MUST,
 };
 
-#define rq_end_sector(rq)       ((rq)->sector + (rq)->nr_sectors)
+#define rq_end_sector(rq)       (blk_rq_pos(rq) + blk_rq_sectors(rq))
 #define rb_entry_rq(node)       rb_entry((node), struct request, rb_node)
 
 /*