Merge branch 'for-3.20/core' of git://git.kernel.dk/linux-block

Pull core block IO changes from Jens Axboe:
 "This contains:

   - A series from Christoph that cleans up and refactors various parts
     of the REQ_BLOCK_PC handling.  Contributions in that series from
     Dongsu Park and Kent Overstreet as well.

   - CFQ:
        - A bug fix for cfq for realtime IO scheduling from Jeff Moyer.
        - A stable patch fixing a potential crash in CFQ in OOM
          situations.  From Konstantin Khlebnikov.

   - blk-mq:
        - Add support for tag allocation policies, from Shaohua. This is
          a prep patch enabling libata (and other SCSI parts) to use the
          blk-mq tagging, instead of rolling their own.
        - Various little tweaks from Keith and Mike, in preparation for
          DM blk-mq support.
        - Minor little fixes or tweaks from me.
        - A double free error fix from Tony Battersby.

   - The partition 4k issue fixes from Matthew and Boaz.

   - Add support for zero+unprovision for blkdev_issue_zeroout() from
     Martin"

* 'for-3.20/core' of git://git.kernel.dk/linux-block: (27 commits)
  block: remove unused function blk_bio_map_sg
  block: handle the null_mapped flag correctly in blk_rq_map_user_iov
  blk-mq: fix double-free in error path
  block: prevent request-to-request merging with gaps if not allowed
  blk-mq: make blk_mq_run_queues() static
  dm: fix multipath regression due to initializing wrong request
  cfq-iosched: handle failure of cfq group allocation
  block: Quiesce zeroout wrapper
  block: rewrite and split __bio_copy_iov()
  block: merge __bio_map_user_iov into bio_map_user_iov
  block: merge __bio_map_kern into bio_map_kern
  block: pass iov_iter to the BLOCK_PC mapping functions
  block: add a helper to free bio bounce buffer pages
  block: use blk_rq_map_user_iov to implement blk_rq_map_user
  block: simplify bio_map_kern
  block: mark blk-mq devices as stackable
  block: keep established cmd_flags when cloning into a blk-mq request
  block: add blk-mq support to blk_insert_cloned_request()
  block: require blk_rq_prep_clone() be given an initialized clone request
  blk-mq: add tag allocation policy
  ...

3 files changed, 9 insertions, 9 deletions

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 3598110d2cef..89e90ec52f28 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -370,25 +370,25 @@ static int brd_rw_page(struct block_device *bdev, sector_t sector,
 }
 
 #ifdef CONFIG_BLK_DEV_XIP
-static int brd_direct_access(struct block_device *bdev, sector_t sector,
-                        void **kaddr, unsigned long *pfn)
+static long brd_direct_access(struct block_device *bdev, sector_t sector,
+                        void **kaddr, unsigned long *pfn, long size)
 {
         struct brd_device *brd = bdev->bd_disk->private_data;
         struct page *page;
 
         if (!brd)
                 return -ENODEV;
-        if (sector & (PAGE_SECTORS-1))
-                return -EINVAL;
-        if (sector + PAGE_SECTORS > get_capacity(bdev->bd_disk))
-                return -ERANGE;
         page = brd_insert_page(brd, sector);
         if (!page)
                 return -ENOSPC;
         *kaddr = page_address(page);
         *pfn = page_to_pfn(page);
 
-        return 0;
+        /*
+         * TODO: If size > PAGE_SIZE, we could look to see if the next page in
+         * the file happens to be mapped to the next page of physical RAM.
+         */
+        return PAGE_SIZE;
 }
 #endif
 
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index d169b4a79267..cee20354ac37 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1388,7 +1388,7 @@ int drbd_submit_peer_request(struct drbd_device *device,
                 list_add_tail(&peer_req->w.list, &device->active_ee);
                 spin_unlock_irq(&device->resource->req_lock);
                 if (blkdev_issue_zeroout(device->ldev->backing_bdev,
-                        sector, data_size >> 9, GFP_NOIO))
+                        sector, data_size >> 9, GFP_NOIO, false))
                         peer_req->flags |= EE_WAS_ERROR;
                 drbd_endio_write_sec_final(peer_req);
                 return 0;
diff --git a/drivers/block/osdblk.c b/drivers/block/osdblk.c
index 79aa179305b5..e22942596207 100644
--- a/drivers/block/osdblk.c
+++ b/drivers/block/osdblk.c
@@ -423,7 +423,7 @@ static int osdblk_init_disk(struct osdblk_device *osdev)
         }
 
         /* switch queue to TCQ mode; allocate tag map */
-        rc = blk_queue_init_tags(q, OSDBLK_MAX_REQ, NULL);
+        rc = blk_queue_init_tags(q, OSDBLK_MAX_REQ, NULL, BLK_TAG_ALLOC_FIFO);
         if (rc) {
                 blk_cleanup_queue(q);
                 put_disk(disk);