Add an inode map data structure to track the location of inodes in logs.

[bluesky.git] / bluesky / bluesky-private.h

diff --git a/bluesky/bluesky-private.h b/bluesky/bluesky-private.h
index 8601228..e5b5b58 100644 (file)
--- a/bluesky/bluesky-private.h
+++ b/bluesky/bluesky-private.h
@@ -225,6 +225,7 @@ struct _BlueSkyCloudLogState {
     BlueSkyCloudPointer location;
     GList *inode_list;
     GSList *writeback_list;     // Items which are being serialized right now
+    GList *pending_segments;    // Segments which are being uploaded now
 };
 
 gboolean bluesky_cloudlog_equal(gconstpointer a, gconstpointer b);
@@ -266,6 +267,10 @@ struct _BlueSkyLog {
     /* A count of the disk space consumed (in 1024-byte units) by all files
      * tracked by mmap_cache (whether mapped or not, actually). */
     gint disk_used;
+
+    /* The smallest journal sequence number which may still contain data that
+     * must be preserved (since it it not yet in the cloud). */
+    int journal_watermark;
 };
 
 /* An object for tracking log files which are stored locally--either the
@@ -300,6 +305,51 @@ BlueSkyCacheFile *bluesky_cachefile_lookup(BlueSkyFS *fs,
                                            int clouddir, int log_seq);
 void bluesky_cachefile_gc(BlueSkyFS *fs);
 
+/* Used to track log segments that are being written to the cloud. */
+typedef struct {
+    BlueSkyRCStr *data;
+    GSList *items;
+    GMutex *lock;
+    GCond *cond;
+    gboolean complete;
+} SerializedRecord;
+
+/***** Inode map management *****/
+
+/* Mapping information for a single inode number.  These are grouped together
+ * into InodeMapRange objects. */
+typedef struct {
+    uint64_t inum;
+
+    /* The ID of the most recent version of the inode. */
+    BlueSkyCloudID id;
+
+    /* The location where that version is written in the cloud. */
+    BlueSkyCloudPointer location;
+
+    /* If the cloud log entry exists in memory, then a pointer to it, otherwise
+     * NULL. */
+    BlueSkyCloudLog *item;
+} InodeMapEntry;
+
+typedef struct {
+    /* Starting and ending inode number values that fall in this section.
+     * Endpoint values are inclusive. */
+    uint64_t start, end;
+
+    /* A sorted list (by inode number) of InodeMapEntry objects. */
+    GSequence *map_entries;
+
+    /* The location where this inode map section is stored in the cloud. */
+    BlueSkyCloudPointer location;
+
+    /* Have there been changes that require writing this section out again? */
+    gboolean dirty;
+} InodeMapRange;
+
+InodeMapEntry *bluesky_inode_map_lookup(GSequence *inode_map, uint64_t inum,
+                                        int action);
+
 #ifdef __cplusplus
 }
 #endif