brd: add support for rw_page()

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dheeraj Reddy <dheeraj.reddy@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index e73b85cf0756..807d3d5d2fe5 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -360,6 +360,15 @@ out:
         bio_endio(bio, err);
 }
 
+static int brd_rw_page(struct block_device *bdev, sector_t sector,
+                       struct page *page, int rw)
+{
+        struct brd_device *brd = bdev->bd_disk->private_data;
+        int err = brd_do_bvec(brd, page, PAGE_CACHE_SIZE, 0, rw, sector);
+        page_endio(page, rw & WRITE, err);
+        return err;
+}
+
 #ifdef CONFIG_BLK_DEV_XIP
 static int brd_direct_access(struct block_device *bdev, sector_t sector,
                         void **kaddr, unsigned long *pfn)
@@ -419,6 +428,7 @@ static int brd_ioctl(struct block_device *bdev, fmode_t mode,
 
 static const struct block_device_operations brd_fops = {
         .owner =                THIS_MODULE,
+        .rw_page =              brd_rw_page,
         .ioctl =                brd_ioctl,
 #ifdef CONFIG_BLK_DEV_XIP
         .direct_access =        brd_direct_access,