Drop 'size' argument from bio_endio and bi_end_io

As bi_end_io is only called once when the reqeust is complete,
the 'size' argument is now redundant.  Remove it.

Now there is no need for bio_endio to subtract the size completed
from bi_size.  So don't do that either.

While we are at it, change bi_end_io to return void.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

29 files changed, 99 insertions, 205 deletions

diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 007faaf008e7..b1d00ef6659c 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -138,7 +138,7 @@ aoeblk_make_request(struct request_queue *q, struct bio *bio)
         buf = mempool_alloc(d->bufpool, GFP_NOIO);
         if (buf == NULL) {
                 printk(KERN_INFO "aoe: buf allocation failure\n");
-                bio_endio(bio, bio->bi_size, -ENOMEM);
+                bio_endio(bio, -ENOMEM);
                 return 0;
         }
         memset(buf, 0, sizeof(*buf));
@@ -159,7 +159,7 @@ aoeblk_make_request(struct request_queue *q, struct bio *bio)
                         d->aoemajor, d->aoeminor);
                 spin_unlock_irqrestore(&d->lock, flags);
                 mempool_free(buf, d->bufpool);
-                bio_endio(bio, bio->bi_size, -ENXIO);
+                bio_endio(bio, -ENXIO);
                 return 0;
         }
 
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 01fbdd38e3be..5abae34ad65b 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -652,7 +652,7 @@ aoecmd_ata_rsp(struct sk_buff *skb)
                         disk_stat_add(disk, sectors[rw], n_sect);
                         disk_stat_add(disk, io_ticks, duration);
                         n = (buf->flags & BUFFL_FAIL) ? -EIO : 0;
-                        bio_endio(buf->bio, buf->bio->bi_size, n);
+                        bio_endio(buf->bio, n);
                         mempool_free(buf, d->bufpool);
                 }
         }
diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
index 05a97197c918..51f50710e5fc 100644
--- a/drivers/block/aoe/aoedev.c
+++ b/drivers/block/aoe/aoedev.c
@@ -119,7 +119,7 @@ aoedev_downdev(struct aoedev *d)
                 bio = buf->bio;
                 if (--buf->nframesout == 0) {
                         mempool_free(buf, d->bufpool);
-                        bio_endio(bio, bio->bi_size, -EIO);
+                        bio_endio(bio, -EIO);
                 }
                 skb_shinfo(f->skb)->nr_frags = f->skb->data_len = 0;
         }
@@ -130,7 +130,7 @@ aoedev_downdev(struct aoedev *d)
                 list_del(d->bufq.next);
                 bio = buf->bio;
                 mempool_free(buf, d->bufpool);
-                bio_endio(bio, bio->bi_size, -EIO);
+                bio_endio(bio, -EIO);
         }
 
         if (d->gd)
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 084358a828e9..28d145756f6c 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1194,7 +1194,7 @@ static inline void complete_buffers(struct bio *bio, int status)
                 int nr_sectors = bio_sectors(bio);
 
                 bio->bi_next = NULL;
-                bio_endio(bio, nr_sectors << 9, status ? 0 : -EIO);
+                bio_endio(bio, status ? 0 : -EIO);
                 bio = xbh;
         }
 }
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index eb9799acf65b..3853c9a38d6a 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -987,7 +987,7 @@ static inline void complete_buffers(struct bio *bio, int ok)
                 xbh = bio->bi_next;
                 bio->bi_next = NULL;
                 
-                bio_endio(bio, nr_sectors << 9, ok ? 0 : -EIO);
+                bio_endio(bio, ok ? 0 : -EIO);
 
                 bio = xbh;
         }
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index f0a86e201b44..80483aac4cc9 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3810,14 +3810,10 @@ static int check_floppy_change(struct gendisk *disk)
  * a disk in the drive, and whether that disk is writable.
  */
 
-static int floppy_rb0_complete(struct bio *bio, unsigned int bytes_done,
+static void floppy_rb0_complete(struct bio *bio,
                                int err)
 {
-        if (bio->bi_size)
-                return 1;
-
         complete((struct completion *)bio->bi_private);
-        return 0;
 }
 
 static int __floppy_read_block_0(struct block_device *bdev)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 9f015fce4135..b9233a06934c 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -551,7 +551,7 @@ static int loop_make_request(struct request_queue *q, struct bio *old_bio)
 
 out:
         spin_unlock_irq(&lo->lo_lock);
-        bio_io_error(old_bio, old_bio->bi_size);
+        bio_io_error(old_bio);
         return 0;
 }
 
@@ -580,7 +580,7 @@ static inline void loop_handle_bio(struct loop_device *lo, struct bio *bio)
                 bio_put(bio);
         } else {
                 int ret = do_bio_filebacked(lo, bio);
-                bio_endio(bio, bio->bi_size, ret);
+                bio_endio(bio, ret);
         }
 }
 
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index fadbfd880bab..540bf3676985 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -1058,15 +1058,12 @@ static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec)
         }
 }
 
-static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err)
+static void pkt_end_io_read(struct bio *bio, int err)
 {
         struct packet_data *pkt = bio->bi_private;
         struct pktcdvd_device *pd = pkt->pd;
         BUG_ON(!pd);
 
-        if (bio->bi_size)
-                return 1;
-
         VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
                 (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
 
@@ -1077,19 +1074,14 @@ static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err)
                 wake_up(&pd->wqueue);
         }
         pkt_bio_finished(pd);
-
-        return 0;
 }
 
-static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err)
+static void pkt_end_io_packet_write(struct bio *bio, int err)
 {
         struct packet_data *pkt = bio->bi_private;
         struct pktcdvd_device *pd = pkt->pd;
         BUG_ON(!pd);
 
-        if (bio->bi_size)
-                return 1;
-
         VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
 
         pd->stats.pkt_ended++;
@@ -1098,7 +1090,6 @@ static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int
         atomic_dec(&pkt->io_wait);
         atomic_inc(&pkt->run_sm);
         wake_up(&pd->wqueue);
-        return 0;
 }
 
 /*
@@ -1470,7 +1461,7 @@ static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
         while (bio) {
                 next = bio->bi_next;
                 bio->bi_next = NULL;
-                bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO);
+                bio_endio(bio, uptodate ? 0 : -EIO);
                 bio = next;
         }
         pkt->orig_bios = pkt->orig_bios_tail = NULL;
@@ -2462,19 +2453,15 @@ static int pkt_close(struct inode *inode, struct file *file)
 }
 
 
-static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err)
+static void pkt_end_io_read_cloned(struct bio *bio, int err)
 {
         struct packet_stacked_data *psd = bio->bi_private;
         struct pktcdvd_device *pd = psd->pd;
 
-        if (bio->bi_size)
-                return 1;
-
         bio_put(bio);
-        bio_endio(psd->bio, psd->bio->bi_size, err);
+        bio_endio(psd->bio, err);
         mempool_free(psd, psd_pool);
         pkt_bio_finished(pd);
-        return 0;
 }
 
 static int pkt_make_request(struct request_queue *q, struct bio *bio)
@@ -2620,7 +2607,7 @@ static int pkt_make_request(struct request_queue *q, struct bio *bio)
         }
         return 0;
 end_io:
-        bio_io_error(bio, bio->bi_size);
+        bio_io_error(bio);
         return 0;
 }
 
diff --git a/drivers/block/rd.c b/drivers/block/rd.c
index 65150b548f3a..701ea77f62e9 100644
--- a/drivers/block/rd.c
+++ b/drivers/block/rd.c
@@ -287,10 +287,10 @@ static int rd_make_request(struct request_queue *q, struct bio *bio)
         if (ret)
                 goto fail;
 
-        bio_endio(bio, bio->bi_size, 0);
+        bio_endio(bio, 0);
         return 0;
 fail:
-        bio_io_error(bio, bio->bi_size);
+        bio_io_error(bio);
         return 0;
 } 
 
diff --git a/drivers/block/umem.c b/drivers/block/umem.c
index c378e285d708..be7fac86725e 100644
--- a/drivers/block/umem.c
+++ b/drivers/block/umem.c
@@ -545,7 +545,7 @@ static void process_page(unsigned long data)
 
                 return_bio = bio->bi_next;
                 bio->bi_next = NULL;
-                bio_endio(bio, bio->bi_size, 0);
+                bio_endio(bio, 0);
         }
 }
 
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index bdc52d6922b7..8216a6f75be5 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -489,7 +489,7 @@ static void dec_pending(struct dm_crypt_io *io, int error)
         if (!atomic_dec_and_test(&io->pending))
                 return;
 
-        bio_endio(io->base_bio, io->base_bio->bi_size, io->error);
+        bio_endio(io->base_bio, io->error);
 
         mempool_free(io, cc->io_pool);
 }
@@ -509,25 +509,19 @@ static void kcryptd_queue_io(struct dm_crypt_io *io)
         queue_work(_kcryptd_workqueue, &io->work);
 }
 
-static int crypt_endio(struct bio *clone, unsigned int done, int error)
+static void crypt_endio(struct bio *clone, int error)
 {
         struct dm_crypt_io *io = clone->bi_private;
         struct crypt_config *cc = io->target->private;
         unsigned read_io = bio_data_dir(clone) == READ;
 
         /*
-         * free the processed pages, even if
-         * it's only a partially completed write
+         * free the processed pages
          */
-        if (!read_io)
-                crypt_free_buffer_pages(cc, clone, done);
-
-        /* keep going - not finished yet */
-        if (unlikely(clone->bi_size))
-                return 1;
-
-        if (!read_io)
+        if (!read_io) {
+                crypt_free_buffer_pages(cc, clone, clone->bi_size);
                 goto out;
+        }
 
         if (unlikely(!bio_flagged(clone, BIO_UPTODATE))) {
                 error = -EIO;
@@ -537,12 +531,11 @@ static int crypt_endio(struct bio *clone, unsigned int done, int error)
         bio_put(clone);
         io->post_process = 1;
         kcryptd_queue_io(io);
-        return 0;
+        return;
 
 out:
         bio_put(clone);
         dec_pending(io, error);
-        return error;
 }
 
 static void clone_init(struct dm_crypt_io *io, struct bio *clone)
diff --git a/drivers/md/dm-emc.c b/drivers/md/dm-emc.c
index 71cc858b7860..a2191a4fcf77 100644
--- a/drivers/md/dm-emc.c
+++ b/drivers/md/dm-emc.c
@@ -38,13 +38,10 @@ static inline void free_bio(struct bio *bio)
         bio_put(bio);
 }
 
-static int emc_endio(struct bio *bio, unsigned int bytes_done, int error)
+static void emc_endio(struct bio *bio, int error)
 {
         struct dm_path *path = bio->bi_private;
 
-        if (bio->bi_size)
-                return 1;
-
         /* We also need to look at the sense keys here whether or not to
          * switch to the next PG etc.
          *
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index f3a772486437..b8e342fe7586 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -124,15 +124,11 @@ static void dec_count(struct io *io, unsigned int region, int error)
         }
 }
 
-static int endio(struct bio *bio, unsigned int done, int error)
+static void endio(struct bio *bio, int error)
 {
         struct io *io;
         unsigned region;
 
-        /* keep going until we've finished */
-        if (bio->bi_size)
-                return 1;
-
         if (error && bio_data_dir(bio) == READ)
                 zero_fill_bio(bio);
 
@@ -146,8 +142,6 @@ static int endio(struct bio *bio, unsigned int done, int error)
         bio_put(bio);
 
         dec_count(io, region, error);
-
-        return 0;
 }
 
 /*-----------------------------------------------------------------
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index d6ca9d0a6fd1..31056abca89d 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -390,11 +390,11 @@ static void dispatch_queued_ios(struct multipath *m)
 
                 r = map_io(m, bio, mpio, 1);
                 if (r < 0)
-                        bio_endio(bio, bio->bi_size, r);
+                        bio_endio(bio, r);
                 else if (r == DM_MAPIO_REMAPPED)
                         generic_make_request(bio);
                 else if (r == DM_MAPIO_REQUEUE)
-                        bio_endio(bio, bio->bi_size, -EIO);
+                        bio_endio(bio, -EIO);
 
                 bio = next;
         }
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 144071e70a93..d09ff15490a5 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -820,7 +820,7 @@ static void write_callback(unsigned long error, void *context)
                                 break;
                         }
         }
-        bio_endio(bio, bio->bi_size, 0);
+        bio_endio(bio, 0);
 }
 
 static void do_write(struct mirror_set *ms, struct bio *bio)
@@ -900,7 +900,7 @@ static void do_writes(struct mirror_set *ms, struct bio_list *writes)
          */
         if (unlikely(ms->log_failure))
                 while ((bio = bio_list_pop(&sync)))
-                        bio_endio(bio, bio->bi_size, -EIO);
+                        bio_endio(bio, -EIO);
         else while ((bio = bio_list_pop(&sync)))
                 do_write(ms, bio);
 
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 83ddbfe6b8a4..98a633f3d6b0 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -636,7 +636,7 @@ static void error_bios(struct bio *bio)
         while (bio) {
                 n = bio->bi_next;
                 bio->bi_next = NULL;
-                bio_io_error(bio, bio->bi_size);
+                bio_io_error(bio);
                 bio = n;
         }
 }
diff --git a/drivers/md/dm-zero.c b/drivers/md/dm-zero.c
index f314d7dc9c26..bdec206c404b 100644
--- a/drivers/md/dm-zero.c
+++ b/drivers/md/dm-zero.c
@@ -43,7 +43,7 @@ static int zero_map(struct dm_target *ti, struct bio *bio,
                 break;
         }
 
-        bio_endio(bio, bio->bi_size, 0);
+        bio_endio(bio, 0);
 
         /* accepted bio, don't make new request */
         return DM_MAPIO_SUBMITTED;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 2120155929a6..167765c47747 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -484,23 +484,20 @@ static void dec_pending(struct dm_io *io, int error)
                         blk_add_trace_bio(io->md->queue, io->bio,
                                           BLK_TA_COMPLETE);
 
-                        bio_endio(io->bio, io->bio->bi_size, io->error);
+                        bio_endio(io->bio, io->error);
                 }
 
                 free_io(io->md, io);
         }
 }
 
-static int clone_endio(struct bio *bio, unsigned int done, int error)
+static void clone_endio(struct bio *bio, int error)
 {
         int r = 0;
         struct dm_target_io *tio = bio->bi_private;
         struct mapped_device *md = tio->io->md;
         dm_endio_fn endio = tio->ti->type->end_io;
 
-        if (bio->bi_size)
-                return 1;
-
         if (!bio_flagged(bio, BIO_UPTODATE) && !error)
                 error = -EIO;
 
@@ -514,7 +511,7 @@ static int clone_endio(struct bio *bio, unsigned int done, int error)
                         error = r;
                 else if (r == DM_ENDIO_INCOMPLETE)
                         /* The target will handle the io */
-                        return 1;
+                        return;
                 else if (r) {
                         DMWARN("unimplemented target endio return value: %d", r);
                         BUG();
@@ -530,7 +527,6 @@ static int clone_endio(struct bio *bio, unsigned int done, int error)
 
         bio_put(bio);
         free_tio(md, tio);
-        return r;
 }
 
 static sector_t max_io_len(struct mapped_device *md,
@@ -761,7 +757,7 @@ static void __split_bio(struct mapped_device *md, struct bio *bio)
 
         ci.map = dm_get_table(md);
         if (!ci.map) {
-                bio_io_error(bio, bio->bi_size);
+                bio_io_error(bio);
                 return;
         }
 
@@ -803,7 +799,7 @@ static int dm_request(struct request_queue *q, struct bio *bio)
          * guarantee it is (or can be) handled by the targets correctly.
          */
         if (unlikely(bio_barrier(bio))) {
-                bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+                bio_endio(bio, -EOPNOTSUPP);
                 return 0;
         }
 
@@ -820,13 +816,13 @@ static int dm_request(struct request_queue *q, struct bio *bio)
                 up_read(&md->io_lock);
 
                 if (bio_rw(bio) == READA) {
-                        bio_io_error(bio, bio->bi_size);
+                        bio_io_error(bio);
                         return 0;
                 }
 
                 r = queue_io(md, bio);
                 if (r < 0) {
-                        bio_io_error(bio, bio->bi_size);
+                        bio_io_error(bio);
                         return 0;
 
                 } else if (r == 0)
diff --git a/drivers/md/faulty.c b/drivers/md/faulty.c
index cb059cf14c2e..cf2ddce34118 100644
--- a/drivers/md/faulty.c
+++ b/drivers/md/faulty.c
@@ -65,18 +65,16 @@
 #include <linux/raid/md.h>
 
 
-static int faulty_fail(struct bio *bio, unsigned int bytes_done, int error)
+static void faulty_fail(struct bio *bio, int error)
 {
         struct bio *b = bio->bi_private;
 
         b->bi_size = bio->bi_size;
         b->bi_sector = bio->bi_sector;
 
-        if (bio->bi_size == 0)
-                bio_put(bio);
+        bio_put(bio);
 
-        clear_bit(BIO_UPTODATE, &b->bi_flags);
-        return (b->bi_end_io)(b, bytes_done, -EIO);
+        bio_io_error(b);
 }
 
 typedef struct faulty_conf {
@@ -179,7 +177,7 @@ static int make_request(struct request_queue *q, struct bio *bio)
                         /* special case - don't decrement, don't generic_make_request,
                          * just fail immediately
                          */
-                        bio_endio(bio, bio->bi_size, -EIO);
+                        bio_endio(bio, -EIO);
                         return 0;
                 }
 
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 17f795c3e0ab..550148770bb2 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -338,7 +338,7 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
         sector_t block;
 
         if (unlikely(bio_barrier(bio))) {
-                bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+                bio_endio(bio, -EOPNOTSUPP);
                 return 0;
         }
 
@@ -358,7 +358,7 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
                         bdevname(tmp_dev->rdev->bdev, b),
                         (unsigned long long)tmp_dev->size,
                         (unsigned long long)tmp_dev->offset);
-                bio_io_error(bio, bio->bi_size);
+                bio_io_error(bio);
                 return 0;
         }
         if (unlikely(bio->bi_sector + (bio->bi_size >> 9) >
diff --git a/drivers/md/md.c b/drivers/md/md.c
index f883b7e37f3d..e8f102ea9b03 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -213,7 +213,7 @@ static DEFINE_SPINLOCK(all_mddevs_lock);
 
 static int md_fail_request (struct request_queue *q, struct bio *bio)
 {
-        bio_io_error(bio, bio->bi_size);
+        bio_io_error(bio);
         return 0;
 }
 
@@ -384,12 +384,10 @@ static void free_disk_sb(mdk_rdev_t * rdev)
 }
 
 
-static int super_written(struct bio *bio, unsigned int bytes_done, int error)
+static void super_written(struct bio *bio, int error)
 {
         mdk_rdev_t *rdev = bio->bi_private;
         mddev_t *mddev = rdev->mddev;
-        if (bio->bi_size)
-                return 1;
 
         if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
                 printk("md: super_written gets error=%d, uptodate=%d\n",
@@ -401,16 +399,13 @@ static int super_written(struct bio *bio, unsigned int bytes_done, int error)
         if (atomic_dec_and_test(&mddev->pending_writes))
                 wake_up(&mddev->sb_wait);
         bio_put(bio);
-        return 0;
 }
 
-static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
+static void super_written_barrier(struct bio *bio, int error)
 {
         struct bio *bio2 = bio->bi_private;
         mdk_rdev_t *rdev = bio2->bi_private;
         mddev_t *mddev = rdev->mddev;
-        if (bio->bi_size)
-                return 1;
 
         if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
             error == -EOPNOTSUPP) {
@@ -424,11 +419,11 @@ static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int e
                 spin_unlock_irqrestore(&mddev->write_lock, flags);
                 wake_up(&mddev->sb_wait);
                 bio_put(bio);
-                return 0;
+        } else {
+                bio_put(bio2);
+                bio->bi_private = rdev;
+                super_written(bio, error);
         }
-        bio_put(bio2);
-        bio->bi_private = rdev;
-        return super_written(bio, bytes_done, error);
 }
 
 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
@@ -489,13 +484,9 @@ void md_super_wait(mddev_t *mddev)
         finish_wait(&mddev->sb_wait, &wq);
 }
 
-static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
+static void bi_complete(struct bio *bio, int error)
 {
-        if (bio->bi_size)
-                return 1;
-
         complete((struct completion*)bio->bi_private);
-        return 0;
 }
 
 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 1e2af43a73b9..f2a63f394ad9 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -82,21 +82,17 @@ static void multipath_end_bh_io (struct multipath_bh *mp_bh, int err)
         struct bio *bio = mp_bh->master_bio;
         multipath_conf_t *conf = mddev_to_conf(mp_bh->mddev);
 
-        bio_endio(bio, bio->bi_size, err);
+        bio_endio(bio, err);
         mempool_free(mp_bh, conf->pool);
 }
 
-static int multipath_end_request(struct bio *bio, unsigned int bytes_done,
-                                 int error)
+static void multipath_end_request(struct bio *bio, int error)
 {
         int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
         struct multipath_bh * mp_bh = (struct multipath_bh *)(bio->bi_private);
         multipath_conf_t *conf = mddev_to_conf(mp_bh->mddev);
         mdk_rdev_t *rdev = conf->multipaths[mp_bh->path].rdev;
 
-        if (bio->bi_size)
-                return 1;
-
         if (uptodate)
                 multipath_end_bh_io(mp_bh, 0);
         else if (!bio_rw_ahead(bio)) {
@@ -112,7 +108,6 @@ static int multipath_end_request(struct bio *bio, unsigned int bytes_done,
         } else
                 multipath_end_bh_io(mp_bh, error);
         rdev_dec_pending(rdev, conf->mddev);
-        return 0;
 }
 
 static void unplug_slaves(mddev_t *mddev)
@@ -155,7 +150,7 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
         const int rw = bio_data_dir(bio);
 
         if (unlikely(bio_barrier(bio))) {
-                bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+                bio_endio(bio, -EOPNOTSUPP);
                 return 0;
         }
 
@@ -169,7 +164,7 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
 
         mp_bh->path = multipath_map(conf);
         if (mp_bh->path < 0) {
-                bio_endio(bio, bio->bi_size, -EIO);
+                bio_endio(bio, -EIO);
                 mempool_free(mp_bh, conf->pool);
                 return 0;
         }
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index b8216bc6db45..ef0da2d84959 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -420,7 +420,7 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
         const int rw = bio_data_dir(bio);
 
         if (unlikely(bio_barrier(bio))) {
-                bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+                bio_endio(bio, -EOPNOTSUPP);
                 return 0;
         }
 
@@ -490,7 +490,7 @@ bad_map:
                 " or bigger than %dk %llu %d\n", chunk_size, 
                 (unsigned long long)bio->bi_sector, bio->bi_size >> 10);
 
-        bio_io_error(bio, bio->bi_size);
+        bio_io_error(bio);
         return 0;
 }
                            
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index f33a729960ca..6d03bea6fa58 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -238,7 +238,7 @@ static void raid_end_bio_io(r1bio_t *r1_bio)
                         (unsigned long long) bio->bi_sector +
                                 (bio->bi_size >> 9) - 1);
 
-                bio_endio(bio, bio->bi_size,
+                bio_endio(bio,
                         test_bit(R1BIO_Uptodate, &r1_bio->state) ? 0 : -EIO);
         }
         free_r1bio(r1_bio);
@@ -255,16 +255,13 @@ static inline void update_head_pos(int disk, r1bio_t *r1_bio)
                 r1_bio->sector + (r1_bio->sectors);
 }
 
-static int raid1_end_read_request(struct bio *bio, unsigned int bytes_done, int error)
+static void raid1_end_read_request(struct bio *bio, int error)
 {
         int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
         r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
         int mirror;
         conf_t *conf = mddev_to_conf(r1_bio->mddev);
 
-        if (bio->bi_size)
-                return 1;
-        
         mirror = r1_bio->read_disk;
         /*
          * this branch is our 'one mirror IO has finished' event handler:
@@ -301,10 +298,9 @@ static int raid1_end_read_request(struct bio *bio, unsigned int bytes_done, int
         }
 
         rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev);
-        return 0;
 }
 
-static int raid1_end_write_request(struct bio *bio, unsigned int bytes_done, int error)
+static void raid1_end_write_request(struct bio *bio, int error)
 {
         int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
         r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
@@ -312,8 +308,6 @@ static int raid1_end_write_request(struct bio *bio, unsigned int bytes_done, int
         conf_t *conf = mddev_to_conf(r1_bio->mddev);
         struct bio *to_put = NULL;
 
-        if (bio->bi_size)
-                return 1;
 
         for (mirror = 0; mirror < conf->raid_disks; mirror++)
                 if (r1_bio->bios[mirror] == bio)
@@ -366,7 +360,7 @@ static int raid1_end_write_request(struct bio *bio, unsigned int bytes_done, int
                                                (unsigned long long) mbio->bi_sector,
                                                (unsigned long long) mbio->bi_sector +
                                                (mbio->bi_size >> 9) - 1);
-                                        bio_endio(mbio, mbio->bi_size, 0);
+                                        bio_endio(mbio, 0);
                                 }
                         }
                 }
@@ -400,8 +394,6 @@ static int raid1_end_write_request(struct bio *bio, unsigned int bytes_done, int
 
         if (to_put)
                 bio_put(to_put);
-
-        return 0;
 }
 
 
@@ -796,7 +788,7 @@ static int make_request(struct request_queue *q, struct bio * bio)
         if (unlikely(!mddev->barriers_work && bio_barrier(bio))) {
                 if (rw == WRITE)
                         md_write_end(mddev);
-                bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+                bio_endio(bio, -EOPNOTSUPP);
                 return 0;
         }
 
@@ -1137,14 +1129,11 @@ abort:
 }
 
 
-static int end_sync_read(struct bio *bio, unsigned int bytes_done, int error)
+static void end_sync_read(struct bio *bio, int error)
 {
         r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
         int i;
 
-        if (bio->bi_size)
-                return 1;
-
         for (i=r1_bio->mddev->raid_disks; i--; )
                 if (r1_bio->bios[i] == bio)
                         break;
@@ -1160,10 +1149,9 @@ static int end_sync_read(struct bio *bio, unsigned int bytes_done, int error)
 
         if (atomic_dec_and_test(&r1_bio->remaining))
                 reschedule_retry(r1_bio);
-        return 0;
 }
 
-static int end_sync_write(struct bio *bio, unsigned int bytes_done, int error)
+static void end_sync_write(struct bio *bio, int error)
 {
         int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
         r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private);
@@ -1172,9 +1160,6 @@ static int end_sync_write(struct bio *bio, unsigned int bytes_done, int error)
         int i;
         int mirror=0;
 
-        if (bio->bi_size)
-                return 1;
-
         for (i = 0; i < conf->raid_disks; i++)
                 if (r1_bio->bios[i] == bio) {
                         mirror = i;
@@ -1200,7 +1185,6 @@ static int end_sync_write(struct bio *bio, unsigned int bytes_done, int error)
                 md_done_sync(mddev, r1_bio->sectors, uptodate);
                 put_buf(r1_bio);
         }
-        return 0;
 }
 
 static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 4e53792aa520..25a96c42bdb0 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -227,7 +227,7 @@ static void raid_end_bio_io(r10bio_t *r10_bio)
 {
         struct bio *bio = r10_bio->master_bio;
 
-        bio_endio(bio, bio->bi_size,
+        bio_endio(bio,
                 test_bit(R10BIO_Uptodate, &r10_bio->state) ? 0 : -EIO);
         free_r10bio(r10_bio);
 }
@@ -243,15 +243,13 @@ static inline void update_head_pos(int slot, r10bio_t *r10_bio)
                 r10_bio->devs[slot].addr + (r10_bio->sectors);
 }
 
-static int raid10_end_read_request(struct bio *bio, unsigned int bytes_done, int error)
+static void raid10_end_read_request(struct bio *bio, int error)
 {
         int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
         r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
         int slot, dev;
         conf_t *conf = mddev_to_conf(r10_bio->mddev);
 
-        if (bio->bi_size)
-                return 1;
 
         slot = r10_bio->read_slot;
         dev = r10_bio->devs[slot].devnum;
@@ -284,19 +282,15 @@ static int raid10_end_read_request(struct bio *bio, unsigned int bytes_done, int
         }
 
         rdev_dec_pending(conf->mirrors[dev].rdev, conf->mddev);
-        return 0;
 }
 
-static int raid10_end_write_request(struct bio *bio, unsigned int bytes_done, int error)
+static void raid10_end_write_request(struct bio *bio, int error)
 {
         int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
         r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
         int slot, dev;
         conf_t *conf = mddev_to_conf(r10_bio->mddev);
 
-        if (bio->bi_size)
-                return 1;
-
         for (slot = 0; slot < conf->copies; slot++)
                 if (r10_bio->devs[slot].bio == bio)
                         break;
@@ -339,7 +333,6 @@ static int raid10_end_write_request(struct bio *bio, unsigned int bytes_done, in
         }
 
         rdev_dec_pending(conf->mirrors[dev].rdev, conf->mddev);
-        return 0;
 }
 
 
@@ -787,7 +780,7 @@ static int make_request(struct request_queue *q, struct bio * bio)
         unsigned long flags;
 
         if (unlikely(bio_barrier(bio))) {
-                bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+                bio_endio(bio, -EOPNOTSUPP);
                 return 0;
         }
 
@@ -819,7 +812,7 @@ static int make_request(struct request_queue *q, struct bio * bio)
                        " or bigger than %dk %llu %d\n", chunk_sects/2,
                        (unsigned long long)bio->bi_sector, bio->bi_size >> 10);
 
-                bio_io_error(bio, bio->bi_size);
+                bio_io_error(bio);
                 return 0;
         }
 
@@ -1155,15 +1148,12 @@ abort:
 }
 
 
-static int end_sync_read(struct bio *bio, unsigned int bytes_done, int error)
+static void end_sync_read(struct bio *bio, int error)
 {
         r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
         conf_t *conf = mddev_to_conf(r10_bio->mddev);
         int i,d;
 
-        if (bio->bi_size)
-                return 1;
-
         for (i=0; i<conf->copies; i++)
                 if (r10_bio->devs[i].bio == bio)
                         break;
@@ -1192,10 +1182,9 @@ static int end_sync_read(struct bio *bio, unsigned int bytes_done, int error)
                 reschedule_retry(r10_bio);
         }
         rdev_dec_pending(conf->mirrors[d].rdev, conf->mddev);
-        return 0;
 }
 
-static int end_sync_write(struct bio *bio, unsigned int bytes_done, int error)
+static void end_sync_write(struct bio *bio, int error)
 {
         int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
         r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
@@ -1203,9 +1192,6 @@ static int end_sync_write(struct bio *bio, unsigned int bytes_done, int error)
         conf_t *conf = mddev_to_conf(mddev);
         int i,d;
 
-        if (bio->bi_size)
-                return 1;
-
         for (i = 0; i < conf->copies; i++)
                 if (r10_bio->devs[i].bio == bio)
                         break;
@@ -1228,7 +1214,6 @@ static int end_sync_write(struct bio *bio, unsigned int bytes_done, int error)
                 }
         }
         rdev_dec_pending(conf->mirrors[d].rdev, mddev);
-        return 0;
 }
 
 /*
@@ -1374,7 +1359,7 @@ static void recovery_request_write(mddev_t *mddev, r10bio_t *r10_bio)
         if (test_bit(R10BIO_Uptodate, &r10_bio->state))
                 generic_make_request(wbio);
         else
-                bio_endio(wbio, wbio->bi_size, -EIO);
+                bio_endio(wbio, -EIO);
 }
 
 
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index f96dea975fa5..caaca9e178bc 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -108,12 +108,11 @@ static void return_io(struct bio *return_bi)
 {
         struct bio *bi = return_bi;
         while (bi) {
-                int bytes = bi->bi_size;
 
                 return_bi = bi->bi_next;
                 bi->bi_next = NULL;
                 bi->bi_size = 0;
-                bi->bi_end_io(bi, bytes,
+                bi->bi_end_io(bi,
                               test_bit(BIO_UPTODATE, &bi->bi_flags)
                                 ? 0 : -EIO);
                 bi = return_bi;
@@ -382,10 +381,10 @@ static unsigned long get_stripe_work(struct stripe_head *sh)
         return pending;
 }
 
-static int
-raid5_end_read_request(struct bio *bi, unsigned int bytes_done, int error);
-static int
-raid5_end_write_request (struct bio *bi, unsigned int bytes_done, int error);
+static void
+raid5_end_read_request(struct bio *bi, int error);
+static void
+raid5_end_write_request(struct bio *bi, int error);
 
 static void ops_run_io(struct stripe_head *sh)
 {
@@ -1110,8 +1109,7 @@ static void shrink_stripes(raid5_conf_t *conf)
         conf->slab_cache = NULL;
 }
 
-static int raid5_end_read_request(struct bio * bi, unsigned int bytes_done,
-                                   int error)
+static void raid5_end_read_request(struct bio * bi, int error)
 {
         struct stripe_head *sh = bi->bi_private;
         raid5_conf_t *conf = sh->raid_conf;
@@ -1120,8 +1118,6 @@ static int raid5_end_read_request(struct bio * bi, unsigned int bytes_done,
         char b[BDEVNAME_SIZE];
         mdk_rdev_t *rdev;
 
-        if (bi->bi_size)
-                return 1;
 
         for (i=0 ; i<disks; i++)
                 if (bi == &sh->dev[i].req)
@@ -1132,7 +1128,7 @@ static int raid5_end_read_request(struct bio * bi, unsigned int bytes_done,
                 uptodate);
         if (i == disks) {
                 BUG();
-                return 0;
+                return;
         }
 
         if (uptodate) {
@@ -1185,20 +1181,15 @@ static int raid5_end_read_request(struct bio * bi, unsigned int bytes_done,
         clear_bit(R5_LOCKED, &sh->dev[i].flags);
         set_bit(STRIPE_HANDLE, &sh->state);
         release_stripe(sh);
-        return 0;
 }
 
-static int raid5_end_write_request (struct bio *bi, unsigned int bytes_done,
-                                    int error)
+static void raid5_end_write_request (struct bio *bi, int error)
 {
         struct stripe_head *sh = bi->bi_private;
         raid5_conf_t *conf = sh->raid_conf;
         int disks = sh->disks, i;
         int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags);
 
-        if (bi->bi_size)
-                return 1;
-
         for (i=0 ; i<disks; i++)
                 if (bi == &sh->dev[i].req)
                         break;
@@ -1208,7 +1199,7 @@ static int raid5_end_write_request (struct bio *bi, unsigned int bytes_done,
                 uptodate);
         if (i == disks) {
                 BUG();
-                return 0;
+                return;
         }
 
         if (!uptodate)
@@ -1219,7 +1210,6 @@ static int raid5_end_write_request (struct bio *bi, unsigned int bytes_done,
         clear_bit(R5_LOCKED, &sh->dev[i].flags);
         set_bit(STRIPE_HANDLE, &sh->state);
         release_stripe(sh);
-        return 0;
 }
 
 
@@ -3340,7 +3330,7 @@ static struct bio *remove_bio_from_retry(raid5_conf_t *conf)
  *  first).
  *  If the read failed..
  */
-static int raid5_align_endio(struct bio *bi, unsigned int bytes, int error)
+static void raid5_align_endio(struct bio *bi, int error)
 {
         struct bio* raid_bi  = bi->bi_private;
         mddev_t *mddev;
@@ -3348,8 +3338,6 @@ static int raid5_align_endio(struct bio *bi, unsigned int bytes, int error)
         int uptodate = test_bit(BIO_UPTODATE, &bi->bi_flags);
         mdk_rdev_t *rdev;
 
-        if (bi->bi_size)
-                return 1;
         bio_put(bi);
 
         mddev = raid_bi->bi_bdev->bd_disk->queue->queuedata;
@@ -3360,17 +3348,16 @@ static int raid5_align_endio(struct bio *bi, unsigned int bytes, int error)
         rdev_dec_pending(rdev, conf->mddev);
 
         if (!error && uptodate) {
-                bio_endio(raid_bi, bytes, 0);
+                bio_endio(raid_bi, 0);
                 if (atomic_dec_and_test(&conf->active_aligned_reads))
                         wake_up(&conf->wait_for_stripe);
-                return 0;
+                return;
         }
 
 
         pr_debug("raid5_align_endio : io error...handing IO for a retry\n");
 
         add_bio_to_retry(raid_bi, conf);
-        return 0;
 }
 
 static int bio_fits_rdev(struct bio *bi)
@@ -3476,7 +3463,7 @@ static int make_request(struct request_queue *q, struct bio * bi)
         int remaining;
 
         if (unlikely(bio_barrier(bi))) {
-                bio_endio(bi, bi->bi_size, -EOPNOTSUPP);
+                bio_endio(bi, -EOPNOTSUPP);
                 return 0;
         }
 
@@ -3592,12 +3579,11 @@ static int make_request(struct request_queue *q, struct bio * bi)
         remaining = --bi->bi_phys_segments;
         spin_unlock_irq(&conf->device_lock);
         if (remaining == 0) {
-                int bytes = bi->bi_size;
 
                 if ( rw == WRITE )
                         md_write_end(mddev);
-                bi->bi_size = 0;
-                bi->bi_end_io(bi, bytes,
+
+                bi->bi_end_io(bi,
                               test_bit(BIO_UPTODATE, &bi->bi_flags)
                                 ? 0 : -EIO);
         }
@@ -3875,10 +3861,8 @@ static int  retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio)
         remaining = --raid_bio->bi_phys_segments;
         spin_unlock_irq(&conf->device_lock);
         if (remaining == 0) {
-                int bytes = raid_bio->bi_size;
 
-                raid_bio->bi_size = 0;
-                raid_bio->bi_end_io(raid_bio, bytes,
+                raid_bio->bi_end_io(raid_bio,
                               test_bit(BIO_UPTODATE, &raid_bio->bi_flags)
                                 ? 0 : -EIO);
         }
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 4d8798bacf97..859f870552e3 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -674,10 +674,10 @@ dcssblk_make_request(struct request_queue *q, struct bio *bio)
                 }
                 bytes_done += bvec->bv_len;
         }
-        bio_endio(bio, bytes_done, 0);
+        bio_endio(bio, 0);
         return 0;
 fail:
-        bio_io_error(bio, bio->bi_size);
+        bio_io_error(bio);
         return 0;
 }
 
diff --git a/drivers/s390/block/xpram.c b/drivers/s390/block/xpram.c
index 354a060e5bec..0fbacc8b1063 100644
--- a/drivers/s390/block/xpram.c
+++ b/drivers/s390/block/xpram.c
@@ -230,12 +230,10 @@ static int xpram_make_request(struct request_queue *q, struct bio *bio)
                 }
         }
         set_bit(BIO_UPTODATE, &bio->bi_flags);
-        bytes = bio->bi_size;
-        bio->bi_size = 0;
-        bio->bi_end_io(bio, bytes, 0);
+        bio_end_io(bio, 0);
         return 0;
 fail:
-        bio_io_error(bio, bio->bi_size);
+        bio_io_error(bio);
         return 0;
 }
 
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 59b398530295..604f4d717933 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -266,13 +266,9 @@ static int scsi_merge_bio(struct request *rq, struct bio *bio)
         return blk_rq_append_bio(q, rq, bio);
 }
 
-static int scsi_bi_endio(struct bio *bio, unsigned int bytes_done, int error)
+static void scsi_bi_endio(struct bio *bio, int error)
 {
-        if (bio->bi_size)
-                return 1;
-
         bio_put(bio);
-        return 0;
 }
 
 /**
@@ -328,7 +324,7 @@ static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
                         if (bio->bi_vcnt >= nr_vecs) {
                                 err = scsi_merge_bio(rq, bio);
                                 if (err) {
-                                        bio_endio(bio, bio->bi_size, 0);
+                                        bio_endio(bio, 0);
                                         goto free_bios;
                                 }
                                 bio = NULL;
@@ -350,7 +346,7 @@ free_bios:
                 /*
                  * call endio instead of bio_put incase it was bounced
                  */
-                bio_endio(bio, bio->bi_size, 0);
+                bio_endio(bio, 0);
         }
 
         return err;