The map::at method does not always exist, so instead use map::find.

[cumulus.git] / metadata.h

diff --git a/metadata.h b/metadata.h
index f86244c..28778c7 100644 (file)
--- a/metadata.h
+++ b/metadata.h
@@ -1,7 +1,24 @@
-/* LBS: An LFS-inspired filesystem backup system
- * Copyright (C) 2007  Michael Vrable
+/* Cumulus: Smart Filesystem Backup to Dumb Servers
  *
- * Handling of metadata written to backup snapshots.  This manages the writing
+ * Copyright (C) 2007-2008  The Regents of the University of California
+ * Written by Michael Vrable <mvrable@cs.ucsd.edu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* Handling of metadata written to backup snapshots.  This manages the writing
  * of file metadata into new backup snapshots, including breaking the metadata
  * log apart across separate objects.  Eventually this should include unified
  * handling of the statcache, and re-use of metadata between snapshots.
@@ -11,6 +28,8 @@
 #define _LBS_METADATA_H
 
 #include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <list>
 #include <string>
 #include <sstream>
@@ -19,33 +38,55 @@
 #include "ref.h"
 #include "util.h"
 
+extern bool flag_full_metadata;
+
 /* Metadata for a single inode, ready to be written out. */
 struct MetadataItem {
     int offset;
     std::string text;
+
+    bool reused;
+    ObjectReference ref;
 };
 
 class MetadataWriter {
 public:
     MetadataWriter(TarSegmentStore *store, const char *path,
                    const char *snapshot_name, const char *snapshot_scheme);
-    void add(const std::string& path, dictionary info);
+    void add(dictionary info);
     ObjectReference close();
 
+    bool find(const std::string& path);
+    ObjectReference old_ref() const {
+        return ObjectReference::parse(old_metadata_loc);
+    }
+
+    bool is_unchanged(const struct stat *stat_buf);
+
+    dictionary get_old_metadata() const { return old_metadata; }
+    std::list<ObjectReference> get_blocks();
+    std::string get_checksum() { return old_metadata["checksum"]; }
+
 private:
     void metadata_flush();
+    void read_statcache();
 
     // Where are objects eventually written to?
     TarSegmentStore *store;
 
     // File descriptors for reading/writing local statcache data
     std::string statcache_path, statcache_tmp_path;
-    FILE *statcache_out;
+    FILE *statcache_in, *statcache_out;
 
     // Metadata not yet written out to the segment store
     size_t chunk_size;
     std::list<MetadataItem> items;
     std::ostringstream metadata_root;
+
+    // Statcache information read back in from a previous run
+    bool old_metadata_eof;
+    dictionary old_metadata;
+    std::string old_metadata_loc;   // Reference to where the metadata is found
 };
 
 #endif // _LBS_METADATA_H