Btrfs: Various small fixes.

This trivial patch contains two locking fixes and a off by one fix.

---

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index a2c821e3c3a7..ebf5362da1d2 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -389,9 +389,7 @@ int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
         return 0;
 }
 
-int btrfs_add_dead_root(struct btrfs_root *root,
-                        struct btrfs_root *latest,
-                        struct list_head *dead_list)
+int btrfs_add_dead_root(struct btrfs_root *root, struct btrfs_root *latest)
 {
         struct btrfs_dirty_root *dirty;
 
@@ -400,7 +398,10 @@ int btrfs_add_dead_root(struct btrfs_root *root,
                 return -ENOMEM;
         dirty->root = root;
         dirty->latest_root = latest;
-        list_add(&dirty->list, dead_list);
+
+        mutex_lock(&root->fs_info->trans_mutex);
+        list_add(&dirty->list, &latest->fs_info->dead_roots);
+        mutex_unlock(&root->fs_info->trans_mutex);
         return 0;
 }