btrfs: remove old unused commented out code

Remove code which has been #if0-ed out for a very long time and does not
seem to be related to current codebase anymore.

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

1 files changed, 0 insertions, 134 deletions

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 955f76eb0fa8..211aceeb9ea0 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -346,49 +346,6 @@ out_unlock:
         return ret;
 }
 
-#if 0
-/*
- * rate limit against the drop_snapshot code.  This helps to slow down new
- * operations if the drop_snapshot code isn't able to keep up.
- */
-static void throttle_on_drops(struct btrfs_root *root)
-{
-        struct btrfs_fs_info *info = root->fs_info;
-        int harder_count = 0;
-
-harder:
-        if (atomic_read(&info->throttles)) {
-                DEFINE_WAIT(wait);
-                int thr;
-                thr = atomic_read(&info->throttle_gen);
-
-                do {
-                        prepare_to_wait(&info->transaction_throttle,
-                                        &wait, TASK_UNINTERRUPTIBLE);
-                        if (!atomic_read(&info->throttles)) {
-                                finish_wait(&info->transaction_throttle, &wait);
-                                break;
-                        }
-                        schedule();
-                        finish_wait(&info->transaction_throttle, &wait);
-                } while (thr == atomic_read(&info->throttle_gen));
-                harder_count++;
-
-                if (root->fs_info->total_ref_cache_size > 1 * 1024 * 1024 &&
-                    harder_count < 2)
-                        goto harder;
-
-                if (root->fs_info->total_ref_cache_size > 5 * 1024 * 1024 &&
-                    harder_count < 10)
-                        goto harder;
-
-                if (root->fs_info->total_ref_cache_size > 10 * 1024 * 1024 &&
-                    harder_count < 20)
-                        goto harder;
-        }
-}
-#endif
-
 void btrfs_throttle(struct btrfs_root *root)
 {
         mutex_lock(&root->fs_info->trans_mutex);
@@ -808,97 +765,6 @@ int btrfs_defrag_root(struct btrfs_root *root, int cacheonly)
         return ret;
 }
 
-#if 0
-/*
- * when dropping snapshots, we generate a ton of delayed refs, and it makes
- * sense not to join the transaction while it is trying to flush the current
- * queue of delayed refs out.
- *
- * This is used by the drop snapshot code only
- */
-static noinline int wait_transaction_pre_flush(struct btrfs_fs_info *info)
-{
-        DEFINE_WAIT(wait);
-
-        mutex_lock(&info->trans_mutex);
-        while (info->running_transaction &&
-               info->running_transaction->delayed_refs.flushing) {
-                prepare_to_wait(&info->transaction_wait, &wait,
-                                TASK_UNINTERRUPTIBLE);
-                mutex_unlock(&info->trans_mutex);
-
-                schedule();
-
-                mutex_lock(&info->trans_mutex);
-                finish_wait(&info->transaction_wait, &wait);
-        }
-        mutex_unlock(&info->trans_mutex);
-        return 0;
-}
-
-/*
- * Given a list of roots that need to be deleted, call btrfs_drop_snapshot on
- * all of them
- */
-int btrfs_drop_dead_root(struct btrfs_root *root)
-{
-        struct btrfs_trans_handle *trans;
-        struct btrfs_root *tree_root = root->fs_info->tree_root;
-        unsigned long nr;
-        int ret;
-
-        while (1) {
-                /*
-                 * we don't want to jump in and create a bunch of
-                 * delayed refs if the transaction is starting to close
-                 */
-                wait_transaction_pre_flush(tree_root->fs_info);
-                trans = btrfs_start_transaction(tree_root, 1);
-
-                /*
-                 * we've joined a transaction, make sure it isn't
-                 * closing right now
-                 */
-                if (trans->transaction->delayed_refs.flushing) {
-                        btrfs_end_transaction(trans, tree_root);
-                        continue;
-                }
-
-                ret = btrfs_drop_snapshot(trans, root);
-                if (ret != -EAGAIN)
-                        break;
-
-                ret = btrfs_update_root(trans, tree_root,
-                                        &root->root_key,
-                                        &root->root_item);
-                if (ret)
-                        break;
-
-                nr = trans->blocks_used;
-                ret = btrfs_end_transaction(trans, tree_root);
-                BUG_ON(ret);
-
-                btrfs_btree_balance_dirty(tree_root, nr);
-                cond_resched();
-        }
-        BUG_ON(ret);
-
-        ret = btrfs_del_root(trans, tree_root, &root->root_key);
-        BUG_ON(ret);
-
-        nr = trans->blocks_used;
-        ret = btrfs_end_transaction(trans, tree_root);
-        BUG_ON(ret);
-
-        free_extent_buffer(root->node);
-        free_extent_buffer(root->commit_root);
-        kfree(root);
-
-        btrfs_btree_balance_dirty(tree_root, nr);
-        return ret;
-}
-#endif
-
 /*
  * new snapshots need to be created at a very specific time in the
  * transaction commit.  This does the actual creation