@@ -3995,6 +3995,56 @@ static noinline int log_dir_items(struct btrfs_trans_handle *trans,
return err;
}
+/*
+ * If the inode was logged before and it was evicted, then its
+ * last_dir_index_offset is (u64)-1, so we don't the value of the last index
+ * key offset. If that's the case, search for it and update the inode. This
+ * is to avoid lookups in the log tree every time we try to insert a dir index
+ * key from a leaf changed in the current transaction, and to allow us to always
+ * do batch insertions of dir index keys.
+ */
+static int update_last_dir_index_offset(struct btrfs_inode *inode,
+ struct btrfs_path *path,
+ const struct btrfs_log_ctx *ctx)
+{
+ const u64 ino = btrfs_ino(inode);
+ struct btrfs_key key;
+ int ret;
+
+ lockdep_assert_held(&inode->log_mutex);
+
+ if (inode->last_dir_index_offset != (u64)-1)
+ return 0;
+
+ if (!ctx->logged_before) {
+ inode->last_dir_index_offset = BTRFS_DIR_START_INDEX - 1;
+ return 0;
+ }
+
+ key.objectid = ino;
+ key.type = BTRFS_DIR_INDEX_KEY;
+ key.offset = (u64)-1;
+
+ ret = btrfs_search_slot(NULL, inode->root->log_root, &key, path, 0, 0);
+ if (ret <= 0)
+ goto out;
+
+ ret = 0;
+ inode->last_dir_index_offset = BTRFS_DIR_START_INDEX - 1;
+
+ if (path->slots[0] == 0)
+ goto out;
+
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0] - 1);
+ if (key.objectid == ino && key.type == BTRFS_DIR_INDEX_KEY)
+ inode->last_dir_index_offset = key.offset;
+
+out:
+ btrfs_release_path(path);
+
+ return ret;
+}
+
/*
* logging directories is very similar to logging inodes, We find all the items
* from the current transaction and write them to the log.
@@ -4017,6 +4067,10 @@ static noinline int log_directory_changes(struct btrfs_trans_handle *trans,
u64 max_key;
int ret;
+ ret = update_last_dir_index_offset(inode, path, ctx);
+ if (ret)
+ return ret;
+
min_key = BTRFS_DIR_START_INDEX;
max_key = 0;
ctx->last_dir_item_offset = inode->last_dir_index_offset;