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Commit 24562425 authored by Yan Zheng's avatar Yan Zheng Committed by Chris Mason
Browse files

Btrfs: hold trans_mutex when using btrfs_record_root_in_trans 



btrfs_record_root_in_trans needs the trans_mutex held to make sure two
callers don't race to setup the root in a given transaction.  This adds
it to all the places that were missing it.

Signed-off-by: default avatarYan Zheng <zheng.yan@oracle.com>
parent 4008c04a

fs/btrfs/extent-tree.c

+2 −0
Original line number Diff line number Diff line
@@ -5658,7 +5658,9 @@ static noinline int relocate_one_extent(struct btrfs_root *extent_root, 
			prev_block = block_start;

		}



		mutex_lock(&extent_root->fs_info->trans_mutex);

		btrfs_record_root_in_trans(found_root);

		mutex_unlock(&extent_root->fs_info->trans_mutex);

		if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {

			/*

			 * try to update data extent references while

fs/btrfs/transaction.c

+2 −0
Original line number Diff line number Diff line
@@ -688,7 +688,9 @@ static noinline int drop_dirty_roots(struct btrfs_root *tree_root, 
		num_bytes -= btrfs_root_used(&dirty->root->root_item);

		bytes_used = btrfs_root_used(&root->root_item);

		if (num_bytes) {

			mutex_lock(&root->fs_info->trans_mutex);

			btrfs_record_root_in_trans(root);

			mutex_unlock(&root->fs_info->trans_mutex);

			btrfs_set_root_used(&root->root_item,

					    bytes_used - num_bytes);

		}

fs/btrfs/tree-log.c

+2 −0
Original line number Diff line number Diff line
@@ -2832,7 +2832,9 @@ again: 
		BUG_ON(!wc.replay_dest);



		wc.replay_dest->log_root = log;

		mutex_lock(&fs_info->trans_mutex);

		btrfs_record_root_in_trans(wc.replay_dest);

		mutex_unlock(&fs_info->trans_mutex);

		ret = walk_log_tree(trans, log, &wc);

		BUG_ON(ret);