drop vmerge accounting

Remove hw_segments field from struct bio and struct request. Without virtual
merge accounting they have no purpose.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2 files changed, 1 insertions, 22 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 894d16ce0020..dfc3556d311c 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -77,21 +77,8 @@ struct bio {
          */
         unsigned short          bi_phys_segments;
 
-        /* Number of segments after physical and DMA remapping
-         * hardware coalescing is performed.
-         */
-        unsigned short          bi_hw_segments;
-
         unsigned int            bi_size;        /* residual I/O count */
 
-        /*
-         * To keep track of the max hw size, we account for the
-         * sizes of the first and last virtually mergeable segments
-         * in this bio
-         */
-        unsigned int            bi_hw_front_size;
-        unsigned int            bi_hw_back_size;
-
         unsigned int            bi_max_vecs;    /* max bvl_vecs we can hold */
 
         struct bio_vec          *bi_io_vec;     /* the actual vec list */
@@ -113,7 +100,7 @@ struct bio {
 #define BIO_UPTODATE    0       /* ok after I/O completion */
 #define BIO_RW_BLOCK    1       /* RW_AHEAD set, and read/write would block */
 #define BIO_EOF         2       /* out-out-bounds error */
-#define BIO_SEG_VALID   3       /* nr_hw_seg valid */
+#define BIO_SEG_VALID   3       /* bi_phys_segments valid */
 #define BIO_CLONED      4       /* doesn't own data */
 #define BIO_BOUNCED     5       /* bio is a bounce bio */
 #define BIO_USER_MAPPED 6       /* contains user pages */
@@ -324,7 +311,6 @@ extern void bio_free(struct bio *, struct bio_set *);
 extern void bio_endio(struct bio *, int);
 struct request_queue;
 extern int bio_phys_segments(struct request_queue *, struct bio *);
-extern int bio_hw_segments(struct request_queue *, struct bio *);
 
 extern void __bio_clone(struct bio *, struct bio *);
 extern struct bio *bio_clone(struct bio *, gfp_t);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 490ce458b031..1adb03827bd3 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -189,13 +189,6 @@ struct request {
          */
         unsigned short nr_phys_segments;
 
-        /* Number of scatter-gather addr+len pairs after
-         * physical and DMA remapping hardware coalescing is performed.
-         * This is the number of scatter-gather entries the driver
-         * will actually have to deal with after DMA mapping is done.
-         */
-        unsigned short nr_hw_segments;
-
         unsigned short ioprio;
 
         void *special;