Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 1539 deletions

diff --git a/ANDROID_3.4.5/fs/btrfs/transaction.c b/ANDROID_3.4.5/fs/btrfs/transaction.c
deleted file mode 100644
index 36422254..00000000
--- a/ANDROID_3.4.5/fs/btrfs/transaction.c
+++ /dev/null
@@ -1,1539 +0,0 @@
-/*
- * Copyright (C) 2007 Oracle.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#include <linux/fs.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/writeback.h>
-#include <linux/pagemap.h>
-#include <linux/blkdev.h>
-#include "ctree.h"
-#include "disk-io.h"
-#include "transaction.h"
-#include "locking.h"
-#include "tree-log.h"
-#include "inode-map.h"
-
-#define BTRFS_ROOT_TRANS_TAG 0
-
-void put_transaction(struct btrfs_transaction *transaction)
-{
-	WARN_ON(atomic_read(&transaction->use_count) == 0);
-	if (atomic_dec_and_test(&transaction->use_count)) {
-		BUG_ON(!list_empty(&transaction->list));
-		WARN_ON(transaction->delayed_refs.root.rb_node);
-		WARN_ON(!list_empty(&transaction->delayed_refs.seq_head));
-		memset(transaction, 0, sizeof(*transaction));
-		kmem_cache_free(btrfs_transaction_cachep, transaction);
-	}
-}
-
-static noinline void switch_commit_root(struct btrfs_root *root)
-{
-	free_extent_buffer(root->commit_root);
-	root->commit_root = btrfs_root_node(root);
-}
-
-/*
- * either allocate a new transaction or hop into the existing one
- */
-static noinline int join_transaction(struct btrfs_root *root, int nofail)
-{
-	struct btrfs_transaction *cur_trans;
-
-	spin_lock(&root->fs_info->trans_lock);
-loop:
-	/* The file system has been taken offline. No new transactions. */
-	if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
-		spin_unlock(&root->fs_info->trans_lock);
-		return -EROFS;
-	}
-
-	if (root->fs_info->trans_no_join) {
-		if (!nofail) {
-			spin_unlock(&root->fs_info->trans_lock);
-			return -EBUSY;
-		}
-	}
-
-	cur_trans = root->fs_info->running_transaction;
-	if (cur_trans) {
-		if (cur_trans->aborted) {
-			spin_unlock(&root->fs_info->trans_lock);
-			return cur_trans->aborted;
-		}
-		atomic_inc(&cur_trans->use_count);
-		atomic_inc(&cur_trans->num_writers);
-		cur_trans->num_joined++;
-		spin_unlock(&root->fs_info->trans_lock);
-		return 0;
-	}
-	spin_unlock(&root->fs_info->trans_lock);
-
-	cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS);
-	if (!cur_trans)
-		return -ENOMEM;
-
-	spin_lock(&root->fs_info->trans_lock);
-	if (root->fs_info->running_transaction) {
-		/*
-		 * someone started a transaction after we unlocked.  Make sure
-		 * to redo the trans_no_join checks above
-		 */
-		kmem_cache_free(btrfs_transaction_cachep, cur_trans);
-		cur_trans = root->fs_info->running_transaction;
-		goto loop;
-	}
-
-	atomic_set(&cur_trans->num_writers, 1);
-	cur_trans->num_joined = 0;
-	init_waitqueue_head(&cur_trans->writer_wait);
-	init_waitqueue_head(&cur_trans->commit_wait);
-	cur_trans->in_commit = 0;
-	cur_trans->blocked = 0;
-	/*
-	 * One for this trans handle, one so it will live on until we
-	 * commit the transaction.
-	 */
-	atomic_set(&cur_trans->use_count, 2);
-	cur_trans->commit_done = 0;
-	cur_trans->start_time = get_seconds();
-
-	cur_trans->delayed_refs.root = RB_ROOT;
-	cur_trans->delayed_refs.num_entries = 0;
-	cur_trans->delayed_refs.num_heads_ready = 0;
-	cur_trans->delayed_refs.num_heads = 0;
-	cur_trans->delayed_refs.flushing = 0;
-	cur_trans->delayed_refs.run_delayed_start = 0;
-	cur_trans->delayed_refs.seq = 1;
-	init_waitqueue_head(&cur_trans->delayed_refs.seq_wait);
-	spin_lock_init(&cur_trans->commit_lock);
-	spin_lock_init(&cur_trans->delayed_refs.lock);
-	INIT_LIST_HEAD(&cur_trans->delayed_refs.seq_head);
-
-	INIT_LIST_HEAD(&cur_trans->pending_snapshots);
-	list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
-	extent_io_tree_init(&cur_trans->dirty_pages,
-			     root->fs_info->btree_inode->i_mapping);
-	root->fs_info->generation++;
-	cur_trans->transid = root->fs_info->generation;
-	root->fs_info->running_transaction = cur_trans;
-	cur_trans->aborted = 0;
-	spin_unlock(&root->fs_info->trans_lock);
-
-	return 0;
-}
-
-/*
- * this does all the record keeping required to make sure that a reference
- * counted root is properly recorded in a given transaction.  This is required
- * to make sure the old root from before we joined the transaction is deleted
- * when the transaction commits
- */
-static int record_root_in_trans(struct btrfs_trans_handle *trans,
-			       struct btrfs_root *root)
-{
-	if (root->ref_cows && root->last_trans < trans->transid) {
-		WARN_ON(root == root->fs_info->extent_root);
-		WARN_ON(root->commit_root != root->node);
-
-		/*
-		 * see below for in_trans_setup usage rules
-		 * we have the reloc mutex held now, so there
-		 * is only one writer in this function
-		 */
-		root->in_trans_setup = 1;
-
-		/* make sure readers find in_trans_setup before
-		 * they find our root->last_trans update
-		 */
-		smp_wmb();
-
-		spin_lock(&root->fs_info->fs_roots_radix_lock);
-		if (root->last_trans == trans->transid) {
-			spin_unlock(&root->fs_info->fs_roots_radix_lock);
-			return 0;
-		}
-		radix_tree_tag_set(&root->fs_info->fs_roots_radix,
-			   (unsigned long)root->root_key.objectid,
-			   BTRFS_ROOT_TRANS_TAG);
-		spin_unlock(&root->fs_info->fs_roots_radix_lock);
-		root->last_trans = trans->transid;
-
-		/* this is pretty tricky.  We don't want to
-		 * take the relocation lock in btrfs_record_root_in_trans
-		 * unless we're really doing the first setup for this root in
-		 * this transaction.
-		 *
-		 * Normally we'd use root->last_trans as a flag to decide
-		 * if we want to take the expensive mutex.
-		 *
-		 * But, we have to set root->last_trans before we
-		 * init the relocation root, otherwise, we trip over warnings
-		 * in ctree.c.  The solution used here is to flag ourselves
-		 * with root->in_trans_setup.  When this is 1, we're still
-		 * fixing up the reloc trees and everyone must wait.
-		 *
-		 * When this is zero, they can trust root->last_trans and fly
-		 * through btrfs_record_root_in_trans without having to take the
-		 * lock.  smp_wmb() makes sure that all the writes above are
-		 * done before we pop in the zero below
-		 */
-		btrfs_init_reloc_root(trans, root);
-		smp_wmb();
-		root->in_trans_setup = 0;
-	}
-	return 0;
-}
-
-
-int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
-			       struct btrfs_root *root)
-{
-	if (!root->ref_cows)
-		return 0;
-
-	/*
-	 * see record_root_in_trans for comments about in_trans_setup usage
-	 * and barriers
-	 */
-	smp_rmb();
-	if (root->last_trans == trans->transid &&
-	    !root->in_trans_setup)
-		return 0;
-
-	mutex_lock(&root->fs_info->reloc_mutex);
-	record_root_in_trans(trans, root);
-	mutex_unlock(&root->fs_info->reloc_mutex);
-
-	return 0;
-}
-
-/* wait for commit against the current transaction to become unblocked
- * when this is done, it is safe to start a new transaction, but the current
- * transaction might not be fully on disk.
- */
-static void wait_current_trans(struct btrfs_root *root)
-{
-	struct btrfs_transaction *cur_trans;
-
-	spin_lock(&root->fs_info->trans_lock);
-	cur_trans = root->fs_info->running_transaction;
-	if (cur_trans && cur_trans->blocked) {
-		atomic_inc(&cur_trans->use_count);
-		spin_unlock(&root->fs_info->trans_lock);
-
-		wait_event(root->fs_info->transaction_wait,
-			   !cur_trans->blocked);
-		put_transaction(cur_trans);
-	} else {
-		spin_unlock(&root->fs_info->trans_lock);
-	}
-}
-
-enum btrfs_trans_type {
-	TRANS_START,
-	TRANS_JOIN,
-	TRANS_USERSPACE,
-	TRANS_JOIN_NOLOCK,
-};
-
-static int may_wait_transaction(struct btrfs_root *root, int type)
-{
-	if (root->fs_info->log_root_recovering)
-		return 0;
-
-	if (type == TRANS_USERSPACE)
-		return 1;
-
-	if (type == TRANS_START &&
-	    !atomic_read(&root->fs_info->open_ioctl_trans))
-		return 1;
-
-	return 0;
-}
-
-static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
-						    u64 num_items, int type)
-{
-	struct btrfs_trans_handle *h;
-	struct btrfs_transaction *cur_trans;
-	u64 num_bytes = 0;
-	int ret;
-
-	if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)
-		return ERR_PTR(-EROFS);
-
-	if (current->journal_info) {
-		WARN_ON(type != TRANS_JOIN && type != TRANS_JOIN_NOLOCK);
-		h = current->journal_info;
-		h->use_count++;
-		h->orig_rsv = h->block_rsv;
-		h->block_rsv = NULL;
-		goto got_it;
-	}
-
-	/*
-	 * Do the reservation before we join the transaction so we can do all
-	 * the appropriate flushing if need be.
-	 */
-	if (num_items > 0 && root != root->fs_info->chunk_root) {
-		num_bytes = btrfs_calc_trans_metadata_size(root, num_items);
-		ret = btrfs_block_rsv_add(root,
-					  &root->fs_info->trans_block_rsv,
-					  num_bytes);
-		if (ret)
-			return ERR_PTR(ret);
-	}
-again:
-	h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
-	if (!h)
-		return ERR_PTR(-ENOMEM);
-
-	if (may_wait_transaction(root, type))
-		wait_current_trans(root);
-
-	do {
-		ret = join_transaction(root, type == TRANS_JOIN_NOLOCK);
-		if (ret == -EBUSY)
-			wait_current_trans(root);
-	} while (ret == -EBUSY);
-
-	if (ret < 0) {
-		kmem_cache_free(btrfs_trans_handle_cachep, h);
-		return ERR_PTR(ret);
-	}
-
-	cur_trans = root->fs_info->running_transaction;
-
-	h->transid = cur_trans->transid;
-	h->transaction = cur_trans;
-	h->blocks_used = 0;
-	h->bytes_reserved = 0;
-	h->delayed_ref_updates = 0;
-	h->use_count = 1;
-	h->block_rsv = NULL;
-	h->orig_rsv = NULL;
-	h->aborted = 0;
-
-	smp_mb();
-	if (cur_trans->blocked && may_wait_transaction(root, type)) {
-		btrfs_commit_transaction(h, root);
-		goto again;
-	}
-
-	if (num_bytes) {
-		trace_btrfs_space_reservation(root->fs_info, "transaction",
-					      h->transid, num_bytes, 1);
-		h->block_rsv = &root->fs_info->trans_block_rsv;
-		h->bytes_reserved = num_bytes;
-	}
-
-got_it:
-	btrfs_record_root_in_trans(h, root);
-
-	if (!current->journal_info && type != TRANS_USERSPACE)
-		current->journal_info = h;
-	return h;
-}
-
-struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
-						   int num_items)
-{
-	return start_transaction(root, num_items, TRANS_START);
-}
-struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root)
-{
-	return start_transaction(root, 0, TRANS_JOIN);
-}
-
-struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root)
-{
-	return start_transaction(root, 0, TRANS_JOIN_NOLOCK);
-}
-
-struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root)
-{
-	return start_transaction(root, 0, TRANS_USERSPACE);
-}
-
-/* wait for a transaction commit to be fully complete */
-static noinline void wait_for_commit(struct btrfs_root *root,
-				    struct btrfs_transaction *commit)
-{
-	wait_event(commit->commit_wait, commit->commit_done);
-}
-
-int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid)
-{
-	struct btrfs_transaction *cur_trans = NULL, *t;
-	int ret;
-
-	ret = 0;
-	if (transid) {
-		if (transid <= root->fs_info->last_trans_committed)
-			goto out;
-
-		/* find specified transaction */
-		spin_lock(&root->fs_info->trans_lock);
-		list_for_each_entry(t, &root->fs_info->trans_list, list) {
-			if (t->transid == transid) {
-				cur_trans = t;
-				atomic_inc(&cur_trans->use_count);
-				break;
-			}
-			if (t->transid > transid)
-				break;
-		}
-		spin_unlock(&root->fs_info->trans_lock);
-		ret = -EINVAL;
-		if (!cur_trans)
-			goto out;  /* bad transid */
-	} else {
-		/* find newest transaction that is committing | committed */
-		spin_lock(&root->fs_info->trans_lock);
-		list_for_each_entry_reverse(t, &root->fs_info->trans_list,
-					    list) {
-			if (t->in_commit) {
-				if (t->commit_done)
-					break;
-				cur_trans = t;
-				atomic_inc(&cur_trans->use_count);
-				break;
-			}
-		}
-		spin_unlock(&root->fs_info->trans_lock);
-		if (!cur_trans)
-			goto out;  /* nothing committing|committed */
-	}
-
-	wait_for_commit(root, cur_trans);
-
-	put_transaction(cur_trans);
-	ret = 0;
-out:
-	return ret;
-}
-
-void btrfs_throttle(struct btrfs_root *root)
-{
-	if (!atomic_read(&root->fs_info->open_ioctl_trans))
-		wait_current_trans(root);
-}
-
-static int should_end_transaction(struct btrfs_trans_handle *trans,
-				  struct btrfs_root *root)
-{
-	int ret;
-
-	ret = btrfs_block_rsv_check(root, &root->fs_info->global_block_rsv, 5);
-	return ret ? 1 : 0;
-}
-
-int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
-				 struct btrfs_root *root)
-{
-	struct btrfs_transaction *cur_trans = trans->transaction;
-	struct btrfs_block_rsv *rsv = trans->block_rsv;
-	int updates;
-	int err;
-
-	smp_mb();
-	if (cur_trans->blocked || cur_trans->delayed_refs.flushing)
-		return 1;
-
-	/*
-	 * We need to do this in case we're deleting csums so the global block
-	 * rsv get's used instead of the csum block rsv.
-	 */
-	trans->block_rsv = NULL;
-
-	updates = trans->delayed_ref_updates;
-	trans->delayed_ref_updates = 0;
-	if (updates) {
-		err = btrfs_run_delayed_refs(trans, root, updates);
-		if (err) /* Error code will also eval true */
-			return err;
-	}
-
-	trans->block_rsv = rsv;
-
-	return should_end_transaction(trans, root);
-}
-
-static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
-			  struct btrfs_root *root, int throttle, int lock)
-{
-	struct btrfs_transaction *cur_trans = trans->transaction;
-	struct btrfs_fs_info *info = root->fs_info;
-	int count = 0;
-	int err = 0;
-
-	if (--trans->use_count) {
-		trans->block_rsv = trans->orig_rsv;
-		return 0;
-	}
-
-	btrfs_trans_release_metadata(trans, root);
-	trans->block_rsv = NULL;
-	while (count < 2) {
-		unsigned long cur = trans->delayed_ref_updates;
-		trans->delayed_ref_updates = 0;
-		if (cur &&
-		    trans->transaction->delayed_refs.num_heads_ready > 64) {
-			trans->delayed_ref_updates = 0;
-			btrfs_run_delayed_refs(trans, root, cur);
-		} else {
-			break;
-		}
-		count++;
-	}
-
-	if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) &&
-	    should_end_transaction(trans, root)) {
-		trans->transaction->blocked = 1;
-		smp_wmb();
-	}
-
-	if (lock && cur_trans->blocked && !cur_trans->in_commit) {
-		if (throttle) {
-			/*
-			 * We may race with somebody else here so end up having
-			 * to call end_transaction on ourselves again, so inc
-			 * our use_count.
-			 */
-			trans->use_count++;
-			return btrfs_commit_transaction(trans, root);
-		} else {
-			wake_up_process(info->transaction_kthread);
-		}
-	}
-
-	WARN_ON(cur_trans != info->running_transaction);
-	WARN_ON(atomic_read(&cur_trans->num_writers) < 1);
-	atomic_dec(&cur_trans->num_writers);
-
-	smp_mb();
-	if (waitqueue_active(&cur_trans->writer_wait))
-		wake_up(&cur_trans->writer_wait);
-	put_transaction(cur_trans);
-
-	if (current->journal_info == trans)
-		current->journal_info = NULL;
-
-	if (throttle)
-		btrfs_run_delayed_iputs(root);
-
-	if (trans->aborted ||
-	    root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
-		err = -EIO;
-	}
-
-	memset(trans, 0, sizeof(*trans));
-	kmem_cache_free(btrfs_trans_handle_cachep, trans);
-	return err;
-}
-
-int btrfs_end_transaction(struct btrfs_trans_handle *trans,
-			  struct btrfs_root *root)
-{
-	int ret;
-
-	ret = __btrfs_end_transaction(trans, root, 0, 1);
-	if (ret)
-		return ret;
-	return 0;
-}
-
-int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
-				   struct btrfs_root *root)
-{
-	int ret;
-
-	ret = __btrfs_end_transaction(trans, root, 1, 1);
-	if (ret)
-		return ret;
-	return 0;
-}
-
-int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans,
-				 struct btrfs_root *root)
-{
-	int ret;
-
-	ret = __btrfs_end_transaction(trans, root, 0, 0);
-	if (ret)
-		return ret;
-	return 0;
-}
-
-int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans,
-				struct btrfs_root *root)
-{
-	return __btrfs_end_transaction(trans, root, 1, 1);
-}
-
-/*
- * when btree blocks are allocated, they have some corresponding bits set for
- * them in one of two extent_io trees.  This is used to make sure all of
- * those extents are sent to disk but does not wait on them
- */
-int btrfs_write_marked_extents(struct btrfs_root *root,
-			       struct extent_io_tree *dirty_pages, int mark)
-{
-	int err = 0;
-	int werr = 0;
-	struct address_space *mapping = root->fs_info->btree_inode->i_mapping;
-	u64 start = 0;
-	u64 end;
-
-	while (!find_first_extent_bit(dirty_pages, start, &start, &end,
-				      mark)) {
-		convert_extent_bit(dirty_pages, start, end, EXTENT_NEED_WAIT, mark,
-				   GFP_NOFS);
-		err = filemap_fdatawrite_range(mapping, start, end);
-		if (err)
-			werr = err;
-		cond_resched();
-		start = end + 1;
-	}
-	if (err)
-		werr = err;
-	return werr;
-}
-
-/*
- * when btree blocks are allocated, they have some corresponding bits set for
- * them in one of two extent_io trees.  This is used to make sure all of
- * those extents are on disk for transaction or log commit.  We wait
- * on all the pages and clear them from the dirty pages state tree
- */
-int btrfs_wait_marked_extents(struct btrfs_root *root,
-			      struct extent_io_tree *dirty_pages, int mark)
-{
-	int err = 0;
-	int werr = 0;
-	struct address_space *mapping = root->fs_info->btree_inode->i_mapping;
-	u64 start = 0;
-	u64 end;
-
-	while (!find_first_extent_bit(dirty_pages, start, &start, &end,
-				      EXTENT_NEED_WAIT)) {
-		clear_extent_bits(dirty_pages, start, end, EXTENT_NEED_WAIT, GFP_NOFS);
-		err = filemap_fdatawait_range(mapping, start, end);
-		if (err)
-			werr = err;
-		cond_resched();
-		start = end + 1;
-	}
-	if (err)
-		werr = err;
-	return werr;
-}
-
-/*
- * when btree blocks are allocated, they have some corresponding bits set for
- * them in one of two extent_io trees.  This is used to make sure all of
- * those extents are on disk for transaction or log commit
- */
-int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
-				struct extent_io_tree *dirty_pages, int mark)
-{
-	int ret;
-	int ret2;
-
-	ret = btrfs_write_marked_extents(root, dirty_pages, mark);
-	ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark);
-
-	if (ret)
-		return ret;
-	if (ret2)
-		return ret2;
-	return 0;
-}
-
-int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
-				     struct btrfs_root *root)
-{
-	if (!trans || !trans->transaction) {
-		struct inode *btree_inode;
-		btree_inode = root->fs_info->btree_inode;
-		return filemap_write_and_wait(btree_inode->i_mapping);
-	}
-	return btrfs_write_and_wait_marked_extents(root,
-					   &trans->transaction->dirty_pages,
-					   EXTENT_DIRTY);
-}
-
-/*
- * this is used to update the root pointer in the tree of tree roots.
- *
- * But, in the case of the extent allocation tree, updating the root
- * pointer may allocate blocks which may change the root of the extent
- * allocation tree.
- *
- * So, this loops and repeats and makes sure the cowonly root didn't
- * change while the root pointer was being updated in the metadata.
- */
-static int update_cowonly_root(struct btrfs_trans_handle *trans,
-			       struct btrfs_root *root)
-{
-	int ret;
-	u64 old_root_bytenr;
-	u64 old_root_used;
-	struct btrfs_root *tree_root = root->fs_info->tree_root;
-
-	old_root_used = btrfs_root_used(&root->root_item);
-	btrfs_write_dirty_block_groups(trans, root);
-
-	while (1) {
-		old_root_bytenr = btrfs_root_bytenr(&root->root_item);
-		if (old_root_bytenr == root->node->start &&
-		    old_root_used == btrfs_root_used(&root->root_item))
-			break;
-
-		btrfs_set_root_node(&root->root_item, root->node);
-		ret = btrfs_update_root(trans, tree_root,
-					&root->root_key,
-					&root->root_item);
-		if (ret)
-			return ret;
-
-		old_root_used = btrfs_root_used(&root->root_item);
-		ret = btrfs_write_dirty_block_groups(trans, root);
-		if (ret)
-			return ret;
-	}
-
-	if (root != root->fs_info->extent_root)
-		switch_commit_root(root);
-
-	return 0;
-}
-
-/*
- * update all the cowonly tree roots on disk
- *
- * The error handling in this function may not be obvious. Any of the
- * failures will cause the file system to go offline. We still need
- * to clean up the delayed refs.
- */
-static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans,
-					 struct btrfs_root *root)
-{
-	struct btrfs_fs_info *fs_info = root->fs_info;
-	struct list_head *next;
-	struct extent_buffer *eb;
-	int ret;
-
-	ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
-	if (ret)
-		return ret;
-
-	eb = btrfs_lock_root_node(fs_info->tree_root);
-	ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL,
-			      0, &eb);
-	btrfs_tree_unlock(eb);
-	free_extent_buffer(eb);
-
-	if (ret)
-		return ret;
-
-	ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
-	if (ret)
-		return ret;
-
-	while (!list_empty(&fs_info->dirty_cowonly_roots)) {
-		next = fs_info->dirty_cowonly_roots.next;
-		list_del_init(next);
-		root = list_entry(next, struct btrfs_root, dirty_list);
-
-		ret = update_cowonly_root(trans, root);
-		if (ret)
-			return ret;
-	}
-
-	down_write(&fs_info->extent_commit_sem);
-	switch_commit_root(fs_info->extent_root);
-	up_write(&fs_info->extent_commit_sem);
-
-	return 0;
-}
-
-/*
- * dead roots are old snapshots that need to be deleted.  This allocates
- * a dirty root struct and adds it into the list of dead roots that need to
- * be deleted
- */
-int btrfs_add_dead_root(struct btrfs_root *root)
-{
-	spin_lock(&root->fs_info->trans_lock);
-	list_add(&root->root_list, &root->fs_info->dead_roots);
-	spin_unlock(&root->fs_info->trans_lock);
-	return 0;
-}
-
-/*
- * update all the cowonly tree roots on disk
- */
-static noinline int commit_fs_roots(struct btrfs_trans_handle *trans,
-				    struct btrfs_root *root)
-{
-	struct btrfs_root *gang[8];
-	struct btrfs_fs_info *fs_info = root->fs_info;
-	int i;
-	int ret;
-	int err = 0;
-
-	spin_lock(&fs_info->fs_roots_radix_lock);
-	while (1) {
-		ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix,
-						 (void **)gang, 0,
-						 ARRAY_SIZE(gang),
-						 BTRFS_ROOT_TRANS_TAG);
-		if (ret == 0)
-			break;
-		for (i = 0; i < ret; i++) {
-			root = gang[i];
-			radix_tree_tag_clear(&fs_info->fs_roots_radix,
-					(unsigned long)root->root_key.objectid,
-					BTRFS_ROOT_TRANS_TAG);
-			spin_unlock(&fs_info->fs_roots_radix_lock);
-
-			btrfs_free_log(trans, root);
-			btrfs_update_reloc_root(trans, root);
-			btrfs_orphan_commit_root(trans, root);
-
-			btrfs_save_ino_cache(root, trans);
-
-			/* see comments in should_cow_block() */
-			root->force_cow = 0;
-			smp_wmb();
-
-			if (root->commit_root != root->node) {
-				mutex_lock(&root->fs_commit_mutex);
-				switch_commit_root(root);
-				btrfs_unpin_free_ino(root);
-				mutex_unlock(&root->fs_commit_mutex);
-
-				btrfs_set_root_node(&root->root_item,
-						    root->node);
-			}
-
-			err = btrfs_update_root(trans, fs_info->tree_root,
-						&root->root_key,
-						&root->root_item);
-			spin_lock(&fs_info->fs_roots_radix_lock);
-			if (err)
-				break;
-		}
-	}
-	spin_unlock(&fs_info->fs_roots_radix_lock);
-	return err;
-}
-
-/*
- * defrag a given btree.  If cacheonly == 1, this won't read from the disk,
- * otherwise every leaf in the btree is read and defragged.
- */
-int btrfs_defrag_root(struct btrfs_root *root, int cacheonly)
-{
-	struct btrfs_fs_info *info = root->fs_info;
-	struct btrfs_trans_handle *trans;
-	int ret;
-	unsigned long nr;
-
-	if (xchg(&root->defrag_running, 1))
-		return 0;
-
-	while (1) {
-		trans = btrfs_start_transaction(root, 0);
-		if (IS_ERR(trans))
-			return PTR_ERR(trans);
-
-		ret = btrfs_defrag_leaves(trans, root, cacheonly);
-
-		nr = trans->blocks_used;
-		btrfs_end_transaction(trans, root);
-		btrfs_btree_balance_dirty(info->tree_root, nr);
-		cond_resched();
-
-		if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN)
-			break;
-	}
-	root->defrag_running = 0;
-	return ret;
-}
-
-/*
- * new snapshots need to be created at a very specific time in the
- * transaction commit.  This does the actual creation
- */
-static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
-				   struct btrfs_fs_info *fs_info,
-				   struct btrfs_pending_snapshot *pending)
-{
-	struct btrfs_key key;
-	struct btrfs_root_item *new_root_item;
-	struct btrfs_root *tree_root = fs_info->tree_root;
-	struct btrfs_root *root = pending->root;
-	struct btrfs_root *parent_root;
-	struct btrfs_block_rsv *rsv;
-	struct inode *parent_inode;
-	struct dentry *parent;
-	struct dentry *dentry;
-	struct extent_buffer *tmp;
-	struct extent_buffer *old;
-	int ret;
-	u64 to_reserve = 0;
-	u64 index = 0;
-	u64 objectid;
-	u64 root_flags;
-
-	rsv = trans->block_rsv;
-
-	new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS);
-	if (!new_root_item) {
-		ret = pending->error = -ENOMEM;
-		goto fail;
-	}
-
-	ret = btrfs_find_free_objectid(tree_root, &objectid);
-	if (ret) {
-		pending->error = ret;
-		goto fail;
-	}
-
-	btrfs_reloc_pre_snapshot(trans, pending, &to_reserve);
-
-	if (to_reserve > 0) {
-		ret = btrfs_block_rsv_add_noflush(root, &pending->block_rsv,
-						  to_reserve);
-		if (ret) {
-			pending->error = ret;
-			goto fail;
-		}
-	}
-
-	key.objectid = objectid;
-	key.offset = (u64)-1;
-	key.type = BTRFS_ROOT_ITEM_KEY;
-
-	trans->block_rsv = &pending->block_rsv;
-
-	dentry = pending->dentry;
-	parent = dget_parent(dentry);
-	parent_inode = parent->d_inode;
-	parent_root = BTRFS_I(parent_inode)->root;
-	record_root_in_trans(trans, parent_root);
-
-	/*
-	 * insert the directory item
-	 */
-	ret = btrfs_set_inode_index(parent_inode, &index);
-	BUG_ON(ret); /* -ENOMEM */
-	ret = btrfs_insert_dir_item(trans, parent_root,
-				dentry->d_name.name, dentry->d_name.len,
-				parent_inode, &key,
-				BTRFS_FT_DIR, index);
-	if (ret == -EEXIST) {
-		pending->error = -EEXIST;
-		dput(parent);
-		goto fail;
-	} else if (ret) {
-		goto abort_trans_dput;
-	}
-
-	btrfs_i_size_write(parent_inode, parent_inode->i_size +
-					 dentry->d_name.len * 2);
-	ret = btrfs_update_inode(trans, parent_root, parent_inode);
-	if (ret)
-		goto abort_trans_dput;
-
-	/*
-	 * pull in the delayed directory update
-	 * and the delayed inode item
-	 * otherwise we corrupt the FS during
-	 * snapshot
-	 */
-	ret = btrfs_run_delayed_items(trans, root);
-	if (ret) { /* Transaction aborted */
-		dput(parent);
-		goto fail;
-	}
-
-	record_root_in_trans(trans, root);
-	btrfs_set_root_last_snapshot(&root->root_item, trans->transid);
-	memcpy(new_root_item, &root->root_item, sizeof(*new_root_item));
-	btrfs_check_and_init_root_item(new_root_item);
-
-	root_flags = btrfs_root_flags(new_root_item);
-	if (pending->readonly)
-		root_flags |= BTRFS_ROOT_SUBVOL_RDONLY;
-	else
-		root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY;
-	btrfs_set_root_flags(new_root_item, root_flags);
-
-	old = btrfs_lock_root_node(root);
-	ret = btrfs_cow_block(trans, root, old, NULL, 0, &old);
-	if (ret) {
-		btrfs_tree_unlock(old);
-		free_extent_buffer(old);
-		goto abort_trans_dput;
-	}
-
-	btrfs_set_lock_blocking(old);
-
-	ret = btrfs_copy_root(trans, root, old, &tmp, objectid);
-	/* clean up in any case */
-	btrfs_tree_unlock(old);
-	free_extent_buffer(old);
-	if (ret)
-		goto abort_trans_dput;
-
-	/* see comments in should_cow_block() */
-	root->force_cow = 1;
-	smp_wmb();
-
-	btrfs_set_root_node(new_root_item, tmp);
-	/* record when the snapshot was created in key.offset */
-	key.offset = trans->transid;
-	ret = btrfs_insert_root(trans, tree_root, &key, new_root_item);
-	btrfs_tree_unlock(tmp);
-	free_extent_buffer(tmp);
-	if (ret)
-		goto abort_trans_dput;
-
-	/*
-	 * insert root back/forward references
-	 */
-	ret = btrfs_add_root_ref(trans, tree_root, objectid,
-				 parent_root->root_key.objectid,
-				 btrfs_ino(parent_inode), index,
-				 dentry->d_name.name, dentry->d_name.len);
-	dput(parent);
-	if (ret)
-		goto fail;
-
-	key.offset = (u64)-1;
-	pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key);
-	if (IS_ERR(pending->snap)) {
-		ret = PTR_ERR(pending->snap);
-		goto abort_trans;
-	}
-
-	ret = btrfs_reloc_post_snapshot(trans, pending);
-	if (ret)
-		goto abort_trans;
-	ret = 0;
-fail:
-	kfree(new_root_item);
-	trans->block_rsv = rsv;
-	btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1);
-	return ret;
-
-abort_trans_dput:
-	dput(parent);
-abort_trans:
-	btrfs_abort_transaction(trans, root, ret);
-	goto fail;
-}
-
-/*
- * create all the snapshots we've scheduled for creation
- */
-static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans,
-					     struct btrfs_fs_info *fs_info)
-{
-	struct btrfs_pending_snapshot *pending;
-	struct list_head *head = &trans->transaction->pending_snapshots;
-
-	list_for_each_entry(pending, head, list)
-		create_pending_snapshot(trans, fs_info, pending);
-	return 0;
-}
-
-static void update_super_roots(struct btrfs_root *root)
-{
-	struct btrfs_root_item *root_item;
-	struct btrfs_super_block *super;
-
-	super = root->fs_info->super_copy;
-
-	root_item = &root->fs_info->chunk_root->root_item;
-	super->chunk_root = root_item->bytenr;
-	super->chunk_root_generation = root_item->generation;
-	super->chunk_root_level = root_item->level;
-
-	root_item = &root->fs_info->tree_root->root_item;
-	super->root = root_item->bytenr;
-	super->generation = root_item->generation;
-	super->root_level = root_item->level;
-	if (btrfs_test_opt(root, SPACE_CACHE))
-		super->cache_generation = root_item->generation;
-}
-
-int btrfs_transaction_in_commit(struct btrfs_fs_info *info)
-{
-	int ret = 0;
-	spin_lock(&info->trans_lock);
-	if (info->running_transaction)
-		ret = info->running_transaction->in_commit;
-	spin_unlock(&info->trans_lock);
-	return ret;
-}
-
-int btrfs_transaction_blocked(struct btrfs_fs_info *info)
-{
-	int ret = 0;
-	spin_lock(&info->trans_lock);
-	if (info->running_transaction)
-		ret = info->running_transaction->blocked;
-	spin_unlock(&info->trans_lock);
-	return ret;
-}
-
-/*
- * wait for the current transaction commit to start and block subsequent
- * transaction joins
- */
-static void wait_current_trans_commit_start(struct btrfs_root *root,
-					    struct btrfs_transaction *trans)
-{
-	wait_event(root->fs_info->transaction_blocked_wait, trans->in_commit);
-}
-
-/*
- * wait for the current transaction to start and then become unblocked.
- * caller holds ref.
- */
-static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root,
-					 struct btrfs_transaction *trans)
-{
-	wait_event(root->fs_info->transaction_wait,
-		   trans->commit_done || (trans->in_commit && !trans->blocked));
-}
-
-/*
- * commit transactions asynchronously. once btrfs_commit_transaction_async
- * returns, any subsequent transaction will not be allowed to join.
- */
-struct btrfs_async_commit {
-	struct btrfs_trans_handle *newtrans;
-	struct btrfs_root *root;
-	struct delayed_work work;
-};
-
-static void do_async_commit(struct work_struct *work)
-{
-	struct btrfs_async_commit *ac =
-		container_of(work, struct btrfs_async_commit, work.work);
-
-	btrfs_commit_transaction(ac->newtrans, ac->root);
-	kfree(ac);
-}
-
-int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
-				   struct btrfs_root *root,
-				   int wait_for_unblock)
-{
-	struct btrfs_async_commit *ac;
-	struct btrfs_transaction *cur_trans;
-
-	ac = kmalloc(sizeof(*ac), GFP_NOFS);
-	if (!ac)
-		return -ENOMEM;
-
-	INIT_DELAYED_WORK(&ac->work, do_async_commit);
-	ac->root = root;
-	ac->newtrans = btrfs_join_transaction(root);
-	if (IS_ERR(ac->newtrans)) {
-		int err = PTR_ERR(ac->newtrans);
-		kfree(ac);
-		return err;
-	}
-
-	/* take transaction reference */
-	cur_trans = trans->transaction;
-	atomic_inc(&cur_trans->use_count);
-
-	btrfs_end_transaction(trans, root);
-	schedule_delayed_work(&ac->work, 0);
-
-	/* wait for transaction to start and unblock */
-	if (wait_for_unblock)
-		wait_current_trans_commit_start_and_unblock(root, cur_trans);
-	else
-		wait_current_trans_commit_start(root, cur_trans);
-
-	if (current->journal_info == trans)
-		current->journal_info = NULL;
-
-	put_transaction(cur_trans);
-	return 0;
-}
-
-
-static void cleanup_transaction(struct btrfs_trans_handle *trans,
-				struct btrfs_root *root)
-{
-	struct btrfs_transaction *cur_trans = trans->transaction;
-
-	WARN_ON(trans->use_count > 1);
-
-	spin_lock(&root->fs_info->trans_lock);
-	list_del_init(&cur_trans->list);
-	spin_unlock(&root->fs_info->trans_lock);
-
-	btrfs_cleanup_one_transaction(trans->transaction, root);
-
-	put_transaction(cur_trans);
-	put_transaction(cur_trans);
-
-	trace_btrfs_transaction_commit(root);
-
-	btrfs_scrub_continue(root);
-
-	if (current->journal_info == trans)
-		current->journal_info = NULL;
-
-	kmem_cache_free(btrfs_trans_handle_cachep, trans);
-}
-
-/*
- * btrfs_transaction state sequence:
- *    in_commit = 0, blocked = 0  (initial)
- *    in_commit = 1, blocked = 1
- *    blocked = 0
- *    commit_done = 1
- */
-int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
-			     struct btrfs_root *root)
-{
-	unsigned long joined = 0;
-	struct btrfs_transaction *cur_trans = trans->transaction;
-	struct btrfs_transaction *prev_trans = NULL;
-	DEFINE_WAIT(wait);
-	int ret = -EIO;
-	int should_grow = 0;
-	unsigned long now = get_seconds();
-	int flush_on_commit = btrfs_test_opt(root, FLUSHONCOMMIT);
-
-	btrfs_run_ordered_operations(root, 0);
-
-	btrfs_trans_release_metadata(trans, root);
-	trans->block_rsv = NULL;
-
-	if (cur_trans->aborted)
-		goto cleanup_transaction;
-
-	/* make a pass through all the delayed refs we have so far
-	 * any runnings procs may add more while we are here
-	 */
-	ret = btrfs_run_delayed_refs(trans, root, 0);
-	if (ret)
-		goto cleanup_transaction;
-
-	cur_trans = trans->transaction;
-
-	/*
-	 * set the flushing flag so procs in this transaction have to
-	 * start sending their work down.
-	 */
-	cur_trans->delayed_refs.flushing = 1;
-
-	ret = btrfs_run_delayed_refs(trans, root, 0);
-	if (ret)
-		goto cleanup_transaction;
-
-	spin_lock(&cur_trans->commit_lock);
-	if (cur_trans->in_commit) {
-		spin_unlock(&cur_trans->commit_lock);
-		atomic_inc(&cur_trans->use_count);
-		ret = btrfs_end_transaction(trans, root);
-
-		wait_for_commit(root, cur_trans);
-
-		put_transaction(cur_trans);
-
-		return ret;
-	}
-
-	trans->transaction->in_commit = 1;
-	trans->transaction->blocked = 1;
-	spin_unlock(&cur_trans->commit_lock);
-	wake_up(&root->fs_info->transaction_blocked_wait);
-
-	spin_lock(&root->fs_info->trans_lock);
-	if (cur_trans->list.prev != &root->fs_info->trans_list) {
-		prev_trans = list_entry(cur_trans->list.prev,
-					struct btrfs_transaction, list);
-		if (!prev_trans->commit_done) {
-			atomic_inc(&prev_trans->use_count);
-			spin_unlock(&root->fs_info->trans_lock);
-
-			wait_for_commit(root, prev_trans);
-
-			put_transaction(prev_trans);
-		} else {
-			spin_unlock(&root->fs_info->trans_lock);
-		}
-	} else {
-		spin_unlock(&root->fs_info->trans_lock);
-	}
-
-	if (now < cur_trans->start_time || now - cur_trans->start_time < 1)
-		should_grow = 1;
-
-	do {
-		int snap_pending = 0;
-
-		joined = cur_trans->num_joined;
-		if (!list_empty(&trans->transaction->pending_snapshots))
-			snap_pending = 1;
-
-		WARN_ON(cur_trans != trans->transaction);
-
-		if (flush_on_commit || snap_pending) {
-			btrfs_start_delalloc_inodes(root, 1);
-			btrfs_wait_ordered_extents(root, 0, 1);
-		}
-
-		ret = btrfs_run_delayed_items(trans, root);
-		if (ret)
-			goto cleanup_transaction;
-
-		/*
-		 * rename don't use btrfs_join_transaction, so, once we
-		 * set the transaction to blocked above, we aren't going
-		 * to get any new ordered operations.  We can safely run
-		 * it here and no for sure that nothing new will be added
-		 * to the list
-		 */
-		btrfs_run_ordered_operations(root, 1);
-
-		prepare_to_wait(&cur_trans->writer_wait, &wait,
-				TASK_UNINTERRUPTIBLE);
-
-		if (atomic_read(&cur_trans->num_writers) > 1)
-			schedule_timeout(MAX_SCHEDULE_TIMEOUT);
-		else if (should_grow)
-			schedule_timeout(1);
-
-		finish_wait(&cur_trans->writer_wait, &wait);
-	} while (atomic_read(&cur_trans->num_writers) > 1 ||
-		 (should_grow && cur_trans->num_joined != joined));
-
-	/*
-	 * Ok now we need to make sure to block out any other joins while we
-	 * commit the transaction.  We could have started a join before setting
-	 * no_join so make sure to wait for num_writers to == 1 again.
-	 */
-	spin_lock(&root->fs_info->trans_lock);
-	root->fs_info->trans_no_join = 1;
-	spin_unlock(&root->fs_info->trans_lock);
-	wait_event(cur_trans->writer_wait,
-		   atomic_read(&cur_trans->num_writers) == 1);
-
-	/*
-	 * the reloc mutex makes sure that we stop
-	 * the balancing code from coming in and moving
-	 * extents around in the middle of the commit
-	 */
-	mutex_lock(&root->fs_info->reloc_mutex);
-
-	ret = btrfs_run_delayed_items(trans, root);
-	if (ret) {
-		mutex_unlock(&root->fs_info->reloc_mutex);
-		goto cleanup_transaction;
-	}
-
-	ret = create_pending_snapshots(trans, root->fs_info);
-	if (ret) {
-		mutex_unlock(&root->fs_info->reloc_mutex);
-		goto cleanup_transaction;
-	}
-
-	ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
-	if (ret) {
-		mutex_unlock(&root->fs_info->reloc_mutex);
-		goto cleanup_transaction;
-	}
-
-	/*
-	 * make sure none of the code above managed to slip in a
-	 * delayed item
-	 */
-	btrfs_assert_delayed_root_empty(root);
-
-	WARN_ON(cur_trans != trans->transaction);
-
-	btrfs_scrub_pause(root);
-	/* btrfs_commit_tree_roots is responsible for getting the
-	 * various roots consistent with each other.  Every pointer
-	 * in the tree of tree roots has to point to the most up to date
-	 * root for every subvolume and other tree.  So, we have to keep
-	 * the tree logging code from jumping in and changing any
-	 * of the trees.
-	 *
-	 * At this point in the commit, there can't be any tree-log
-	 * writers, but a little lower down we drop the trans mutex
-	 * and let new people in.  By holding the tree_log_mutex
-	 * from now until after the super is written, we avoid races
-	 * with the tree-log code.
-	 */
-	mutex_lock(&root->fs_info->tree_log_mutex);
-
-	ret = commit_fs_roots(trans, root);
-	if (ret) {
-		mutex_unlock(&root->fs_info->tree_log_mutex);
-		mutex_unlock(&root->fs_info->reloc_mutex);
-		goto cleanup_transaction;
-	}
-
-	/* commit_fs_roots gets rid of all the tree log roots, it is now
-	 * safe to free the root of tree log roots
-	 */
-	btrfs_free_log_root_tree(trans, root->fs_info);
-
-	ret = commit_cowonly_roots(trans, root);
-	if (ret) {
-		mutex_unlock(&root->fs_info->tree_log_mutex);
-		mutex_unlock(&root->fs_info->reloc_mutex);
-		goto cleanup_transaction;
-	}
-
-	btrfs_prepare_extent_commit(trans, root);
-
-	cur_trans = root->fs_info->running_transaction;
-
-	btrfs_set_root_node(&root->fs_info->tree_root->root_item,
-			    root->fs_info->tree_root->node);
-	switch_commit_root(root->fs_info->tree_root);
-
-	btrfs_set_root_node(&root->fs_info->chunk_root->root_item,
-			    root->fs_info->chunk_root->node);
-	switch_commit_root(root->fs_info->chunk_root);
-
-	update_super_roots(root);
-
-	if (!root->fs_info->log_root_recovering) {
-		btrfs_set_super_log_root(root->fs_info->super_copy, 0);
-		btrfs_set_super_log_root_level(root->fs_info->super_copy, 0);
-	}
-
-	memcpy(root->fs_info->super_for_commit, root->fs_info->super_copy,
-	       sizeof(*root->fs_info->super_copy));
-
-	trans->transaction->blocked = 0;
-	spin_lock(&root->fs_info->trans_lock);
-	root->fs_info->running_transaction = NULL;
-	root->fs_info->trans_no_join = 0;
-	spin_unlock(&root->fs_info->trans_lock);
-	mutex_unlock(&root->fs_info->reloc_mutex);
-
-	wake_up(&root->fs_info->transaction_wait);
-
-	ret = btrfs_write_and_wait_transaction(trans, root);
-	if (ret) {
-		btrfs_error(root->fs_info, ret,
-			    "Error while writing out transaction.");
-		mutex_unlock(&root->fs_info->tree_log_mutex);
-		goto cleanup_transaction;
-	}
-
-	ret = write_ctree_super(trans, root, 0);
-	if (ret) {
-		mutex_unlock(&root->fs_info->tree_log_mutex);
-		goto cleanup_transaction;
-	}
-
-	/*
-	 * the super is written, we can safely allow the tree-loggers
-	 * to go about their business
-	 */
-	mutex_unlock(&root->fs_info->tree_log_mutex);
-
-	btrfs_finish_extent_commit(trans, root);
-
-	cur_trans->commit_done = 1;
-
-	root->fs_info->last_trans_committed = cur_trans->transid;
-
-	wake_up(&cur_trans->commit_wait);
-
-	spin_lock(&root->fs_info->trans_lock);
-	list_del_init(&cur_trans->list);
-	spin_unlock(&root->fs_info->trans_lock);
-
-	put_transaction(cur_trans);
-	put_transaction(cur_trans);
-
-	trace_btrfs_transaction_commit(root);
-
-	btrfs_scrub_continue(root);
-
-	if (current->journal_info == trans)
-		current->journal_info = NULL;
-
-	kmem_cache_free(btrfs_trans_handle_cachep, trans);
-
-	if (current != root->fs_info->transaction_kthread)
-		btrfs_run_delayed_iputs(root);
-
-	return ret;
-
-cleanup_transaction:
-	btrfs_printk(root->fs_info, "Skipping commit of aborted transaction.\n");
-//	WARN_ON(1);
-	if (current->journal_info == trans)
-		current->journal_info = NULL;
-	cleanup_transaction(trans, root);
-
-	return ret;
-}
-
-/*
- * interface function to delete all the snapshots we have scheduled for deletion
- */
-int btrfs_clean_old_snapshots(struct btrfs_root *root)
-{
-	LIST_HEAD(list);
-	struct btrfs_fs_info *fs_info = root->fs_info;
-
-	spin_lock(&fs_info->trans_lock);
-	list_splice_init(&fs_info->dead_roots, &list);
-	spin_unlock(&fs_info->trans_lock);
-
-	while (!list_empty(&list)) {
-		int ret;
-
-		root = list_entry(list.next, struct btrfs_root, root_list);
-		list_del(&root->root_list);
-
-		btrfs_kill_all_delayed_nodes(root);
-
-		if (btrfs_header_backref_rev(root->node) <
-		    BTRFS_MIXED_BACKREF_REV)
-			ret = btrfs_drop_snapshot(root, NULL, 0, 0);
-		else
-			ret =btrfs_drop_snapshot(root, NULL, 1, 0);
-		BUG_ON(ret < 0);
-	}
-	return 0;
-}