Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block

[sfrench/cifs-2.6.git] / fs / btrfs / disk-io.c

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 100b07f021b406a97d9f24ae04e3665418eca833..830d261d0e6b9a7faba479160edb72df3d8a6d2a 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -847,7 +847,6 @@ static const struct address_space_operations btree_aops = {
        .writepages     = btree_writepages,
        .releasepage    = btree_releasepage,
        .invalidatepage = btree_invalidatepage,
-       .sync_page      = block_sync_page,
 #ifdef CONFIG_MIGRATION
        .migratepage    = btree_migratepage,
 #endif
@@ -1330,82 +1329,6 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
        return ret;
 }
 
-/*
- * this unplugs every device on the box, and it is only used when page
- * is null
- */
-static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
-{
-       struct btrfs_device *device;
-       struct btrfs_fs_info *info;
-
-       info = (struct btrfs_fs_info *)bdi->unplug_io_data;
-       list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
-               if (!device->bdev)
-                       continue;
-
-               bdi = blk_get_backing_dev_info(device->bdev);
-               if (bdi->unplug_io_fn)
-                       bdi->unplug_io_fn(bdi, page);
-       }
-}
-
-static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
-{
-       struct inode *inode;
-       struct extent_map_tree *em_tree;
-       struct extent_map *em;
-       struct address_space *mapping;
-       u64 offset;
-
-       /* the generic O_DIRECT read code does this */
-       if (1 || !page) {
-               __unplug_io_fn(bdi, page);
-               return;
-       }
-
-       /*
-        * page->mapping may change at any time.  Get a consistent copy
-        * and use that for everything below
-        */
-       smp_mb();
-       mapping = page->mapping;
-       if (!mapping)
-               return;
-
-       inode = mapping->host;
-
-       /*
-        * don't do the expensive searching for a small number of
-        * devices
-        */
-       if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) {
-               __unplug_io_fn(bdi, page);
-               return;
-       }
-
-       offset = page_offset(page);
-
-       em_tree = &BTRFS_I(inode)->extent_tree;
-       read_lock(&em_tree->lock);
-       em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
-       read_unlock(&em_tree->lock);
-       if (!em) {
-               __unplug_io_fn(bdi, page);
-               return;
-       }
-
-       if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
-               free_extent_map(em);
-               __unplug_io_fn(bdi, page);
-               return;
-       }
-       offset = offset - em->start;
-       btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
-                         em->block_start + offset, page);
-       free_extent_map(em);
-}
-
 /*
  * If this fails, caller must call bdi_destroy() to get rid of the
  * bdi again.
@@ -1420,8 +1343,6 @@ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
                return err;
 
        bdi->ra_pages   = default_backing_dev_info.ra_pages;
-       bdi->unplug_io_fn       = btrfs_unplug_io_fn;
-       bdi->unplug_io_data     = info;
        bdi->congested_fn       = btrfs_congested_fn;
        bdi->congested_data     = info;
        return 0;