Btrfs: fix extent state leak on transaction abortion

When transaction is aborted, we fail to commit transaction, instead we do
cleanup work.  After that when we umount btrfs, we get to free fs roots' log
trees respectively, but that happens after we unpin extents, so those extents
pinned by freeing log trees will remain in memory and lead to the leak.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4f142c986544..47c2bc21caad 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2065,6 +2065,12 @@ static void del_fs_roots(struct btrfs_fs_info *fs_info)
                 for (i = 0; i < ret; i++)
                         btrfs_drop_and_free_fs_root(fs_info, gang[i]);
         }
+
+        if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
+                btrfs_free_log_root_tree(NULL, fs_info);
+                btrfs_destroy_pinned_extent(fs_info->tree_root,
+                                            fs_info->pinned_extents);
+        }
 }
 
 int open_ctree(struct super_block *sb,
@@ -3455,10 +3461,8 @@ void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
         if (btrfs_root_refs(&root->root_item) == 0)
                 synchronize_srcu(&fs_info->subvol_srcu);
 
-        if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
+        if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
                 btrfs_free_log(NULL, root);
-                btrfs_free_log_root_tree(NULL, fs_info);
-        }
 
         __btrfs_remove_free_space_cache(root->free_ino_pinned);
         __btrfs_remove_free_space_cache(root->free_ino_ctl);
@@ -3569,8 +3573,6 @@ int close_ctree(struct btrfs_root *root)
         if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
                 btrfs_error_commit_super(root);
 
-        btrfs_put_block_group_cache(fs_info);
-
         kthread_stop(fs_info->transaction_kthread);
         kthread_stop(fs_info->cleaner_kthread);
 
@@ -3588,6 +3590,8 @@ int close_ctree(struct btrfs_root *root)
 
         del_fs_roots(fs_info);
 
+        btrfs_put_block_group_cache(fs_info);
+
         btrfs_free_block_groups(fs_info);
 
         btrfs_stop_all_workers(fs_info);