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: Yan Zheng <zheng.yan@oracle.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index cd86bff..0a5d796 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -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

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 919172d..4112d53 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -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);
                }

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 2079429..9c462fb 100644 (file)
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -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);