[RFC 1/1 linux-next] btrfs: don't opencode zero_user_segment

[Fabian Frederick]

use function defined in include/linux/highmem.h
Note that this reverts 2 last function call order

Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
---
 fs/btrfs/scrub.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index efa0831..fa063cd 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1503,13 +1503,9 @@ static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
 	struct scrub_page *spage = sblock->pagev[page_num];
 
 	BUG_ON(spage->page == NULL);
-	if (spage->io_error) {
-		void *mapped_buffer = kmap_atomic(spage->page);
+	if (spage->io_error)
+		zero_user_segment(spage->page, 0, PAGE_CACHE_SIZE);
 
-		memset(mapped_buffer, 0, PAGE_CACHE_SIZE);
-		flush_dcache_page(spage->page);
-		kunmap_atomic(mapped_buffer);
-	}
 	return scrub_add_page_to_wr_bio(sblock->sctx, spage);
 }
 
-- 
1.9.3

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