Btrfs: introduce free_extent_buffer_stale

Because btrfs cow's we can end up with extent buffers that are no longer
necessary just sitting around in memory.  So instead of evicting these pages, we
could end up evicting things we actually care about.  Thus we have
free_extent_buffer_stale for use when we are freeing tree blocks.  This will
make it so that the ref for the eb being in the radix tree is dropped as soon as
possible and then is freed when the refcount hits 0 instead of waiting to be
released by releasepage.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 9b7e7682fda0..1b831ac4c079 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5018,10 +5018,6 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
                 if (is_data) {
                         ret = btrfs_del_csums(trans, root, bytenr, num_bytes);
                         BUG_ON(ret);
-                } else {
-                        invalidate_mapping_pages(info->btree_inode->i_mapping,
-                             bytenr >> PAGE_CACHE_SHIFT,
-                             (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT);
                 }
 
                 ret = update_block_group(trans, root, bytenr, num_bytes, 0);
@@ -6022,6 +6018,7 @@ struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
         btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level);
         btrfs_tree_lock(buf);
         clean_tree_block(trans, root, buf);
+        clear_bit(EXTENT_BUFFER_STALE, &buf->bflags);
 
         btrfs_set_lock_blocking(buf);
         btrfs_set_buffer_uptodate(buf);