drbd: use the newly introduced page pool for bitmap IO

Conflicts:

	drbd/drbd_bitmap.c

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 9dab3700ca2d..39a1b0dafff4 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -939,9 +939,8 @@ static void bm_async_io_complete(struct bio *bio, int error)
 
         bm_page_unlock_io(mdev, idx);
 
-        /* FIXME give back to page pool */
         if (ctx->flags & BM_AIO_COPY_PAGES)
-                put_page(bio->bi_io_vec[0].bv_page);
+                mempool_free(bio->bi_io_vec[0].bv_page, drbd_md_io_page_pool);
 
         bio_put(bio);
 
@@ -978,10 +977,8 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must
         bm_set_page_unchanged(b->bm_pages[page_nr]);
 
         if (ctx->flags & BM_AIO_COPY_PAGES) {
-                /* FIXME alloc_page is good enough for now, but actually needs
-                 * to use pre-allocated page pool */
                 void *src, *dest;
-                page = alloc_page(__GFP_HIGHMEM|__GFP_WAIT);
+                page = mempool_alloc(drbd_md_io_page_pool, __GFP_HIGHMEM|__GFP_WAIT);
                 dest = kmap_atomic(page);
                 src = kmap_atomic(b->bm_pages[page_nr]);
                 memcpy(dest, src, PAGE_SIZE);
@@ -993,6 +990,8 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must
 
         bio->bi_bdev = mdev->ldev->md_bdev;
         bio->bi_sector = on_disk_sector;
+        /* bio_add_page of a single page to an empty bio will always succeed,
+         * according to api.  Do we want to assert that? */
         bio_add_page(bio, page, len, 0);
         bio->bi_private = ctx;
         bio->bi_end_io = bm_async_io_complete;