btrfs: use clear_page where appropriate

There's a helper to clear whole page, with a arch-specific optimized
code. The replaced cases do not seem to be in performace critical code,
but we still might get some percent gain.

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index da6841e..c5e6180 100644 (file)
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -355,7 +355,7 @@ static void io_ctl_map_page(struct btrfs_io_ctl *io_ctl, int clear)
        io_ctl->orig = io_ctl->cur;
        io_ctl->size = PAGE_SIZE;
        if (clear)
-               memset(io_ctl->cur, 0, PAGE_SIZE);
+               clear_page(io_ctl->cur);
 }
 
 static void io_ctl_drop_pages(struct btrfs_io_ctl *io_ctl)

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index c4d1e60..48dd6f1 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1643,7 +1643,7 @@ static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
        if (spage->io_error) {
                void *mapped_buffer = kmap_atomic(spage->page);
 
-               memset(mapped_buffer, 0, PAGE_SIZE);
+               clear_page(mapped_buffer);
                flush_dcache_page(spage->page);
                kunmap_atomic(mapped_buffer);
        }