Btrfs: Optimize btree walking while logging inodes

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

1 files changed, 19 insertions, 6 deletions

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 5d49a701bdcd..f43ee33ec2dc 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1982,7 +1982,6 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
                         DEFINE_WAIT(wait);
                         prepare_to_wait(&log->fs_info->tree_log_wait, &wait,
                                         TASK_UNINTERRUPTIBLE);
-                        batch = log->fs_info->tree_log_batch;
                         mutex_unlock(&log->fs_info->tree_log_mutex);
                         if (atomic_read(&log->fs_info->tree_log_writers))
                                 schedule();
@@ -2024,8 +2023,7 @@ out:
 
 }
 
-/*
- * free all the extents used by the tree log.  This should be called
+/* * free all the extents used by the tree log.  This should be called
  * at commit time of the full transaction
  */
 int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root)
@@ -2107,6 +2105,9 @@ int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans,
         int ret;
         int bytes_del = 0;
 
+        if (BTRFS_I(dir)->logged_trans < trans->transid)
+                return 0;
+
         ret = join_running_log_trans(root);
         if (ret)
                 return 0;
@@ -2178,6 +2179,9 @@ int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans,
         u64 index;
         int ret;
 
+        if (BTRFS_I(inode)->logged_trans < trans->transid)
+                return 0;
+
         ret = join_running_log_trans(root);
         if (ret)
                 return 0;
@@ -2484,6 +2488,7 @@ static int __btrfs_log_inode(struct btrfs_trans_handle *trans,
         struct btrfs_inode_item *inode_item;
         u32 size;
         int ret;
+        int nritems;
 
         log = root->log_root;
 
@@ -2541,12 +2546,11 @@ static int __btrfs_log_inode(struct btrfs_trans_handle *trans,
                                            path, 0, trans->transid);
                 if (ret != 0)
                         break;
-
+again:
                 if (min_key.objectid != inode->i_ino)
                         break;
                 if (min_key.type > max_key.type)
                         break;
-
                 src = path->nodes[0];
                 size = btrfs_item_size_nr(src, path->slots[0]);
                 ret = btrfs_insert_empty_item(trans, log, dst_path, &min_key,
@@ -2606,9 +2610,17 @@ static int __btrfs_log_inode(struct btrfs_trans_handle *trans,
                 }
 
                 btrfs_mark_buffer_dirty(dst_path->nodes[0]);
-                btrfs_release_path(root, path);
                 btrfs_release_path(log, dst_path);
 
+                nritems = btrfs_header_nritems(path->nodes[0]);
+                path->slots[0]++;
+                if (path->slots[0] < nritems) {
+                        btrfs_item_key_to_cpu(path->nodes[0], &min_key,
+                                              path->slots[0]);
+                        goto again;
+                }
+                btrfs_release_path(root, path);
+
                 if (min_key.offset < (u64)-1)
                         min_key.offset++;
                 else if (min_key.type < (u8)-1)
@@ -2626,6 +2638,7 @@ static int __btrfs_log_inode(struct btrfs_trans_handle *trans,
                 ret = log_directory_changes(trans, root, inode, path, dst_path);
                 BUG_ON(ret);
         }
+        BTRFS_I(inode)->logged_trans = trans->transid;
         mutex_unlock(&BTRFS_I(inode)->log_mutex);
 
         btrfs_free_path(path);