Various small fixes.

Hello,

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

Regards
YZ
---

diff -r 77cbca2f7ae4 ordered-data.c
@@ -548,7 +550,7 @@ int btrfs_ordered_update_i_size(struct i

		 */
		test = rb_entry(node, struct btrfs_ordered_extent, rb_node);
		if (test->file_offset > entry_end(ordered)) {
-			i_size_test = test->file_offset - 1;
+			i_size_test = test->file_offset;
		}
	} else {
		i_size_test = i_size_read(inode);
@@ -561,7 +563,7 @@ int btrfs_ordered_update_i_size(struct i
	 * disk_i_size to the end of the region.
	 */
	if (i_size_test > entry_end(ordered) &&
-	    !test_range_bit(io_tree, entry_end(ordered), i_size_test,
+	    !test_range_bit(io_tree, entry_end(ordered), i_size_test - 1,
			   EXTENT_DELALLOC, 0)) {
		new_i_size = min_t(u64, i_size_test, i_size_read(inode));
	}

diff -r 77cbca2f7ae4 root-tree.c
@@ -209,8 +209,7 @@ again:

			goto err;
		}

- ret = btrfs_add_dead_root(dead_root, latest,
- &root->fs_info->dead_roots);

+		ret = btrfs_add_dead_root(dead_root, latest);
		if (ret)
			goto err;
		goto again;

diff -r 77cbca2f7ae4 super.c
@@ -449,7 +449,9 @@ static int btrfs_get_sb(struct file_syst

		s->s_flags |= MS_ACTIVE;
	}

+	mutex_lock(&s->s_root->d_inode->i_mutex);
	root = lookup_one_len(subvol_name, s->s_root, strlen(subvol_name));
+	mutex_unlock(&s->s_root->d_inode->i_mutex);
	if (IS_ERR(root)) {
		up_write(&s->s_umount);
		deactivate_super(s);

diff -r 77cbca2f7ae4 transaction.c
@@ -389,9 +389,7 @@ int btrfs_commit_tree_roots(struct btrfs

	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_roo

		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;
}

diff -r 77cbca2f7ae4 transaction.h
@@ -90,8 +90,7 @@ int btrfs_commit_tree_roots(struct btrfs

int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,

			    struct btrfs_root *root);

-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); int btrfs_defrag_root(struct btrfs_root *root, int cacheonly); int btrfs_clean_old_snapshots(struct btrfs_root *root);
int btrfs_commit_transaction(struct btrfs_trans_handle *trans,