X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky%2Fbluesky.h;h=29d9a624a4cdb54e0f0b288ca56f3494629865ab;hb=c7cfbc512b8eb08ead281df1865cb3b241a8070a;hp=3fc1c6af1a7b63a8c1c9bb060cc3fac2626aa677;hpb=f597cd5067ed36508118d2ecd29338e7b81f47e4;p=bluesky.git

diff --git a/bluesky/bluesky.h b/bluesky/bluesky.h
index 3fc1c6a..29d9a62 100644
--- a/bluesky/bluesky.h
+++ b/bluesky/bluesky.h
@@ -41,6 +41,16 @@ extern BlueSkyOptions bluesky_options;
  * limit */
 extern int bluesky_max_threads;
 
+/* A general-purpose counter for gathering run-time statistics. */
+struct bluesky_stats {
+    const char *name;
+    int64_t count;
+    int64_t sum;
+};
+struct bluesky_stats *bluesky_stats_new(const char *name);
+void bluesky_stats_add(struct bluesky_stats *stats, int64_t value);
+void bluesky_stats_dump_all();
+
 /* BlueSky status and error codes.  Various frontends should translate these to
  * the appropriate error code for whatever protocol they implement. */
 typedef enum {
@@ -122,6 +132,16 @@ typedef struct {
      * data includes dirty data).  Updates to these variables must be made
      * atomically. */
     gint cache_total, cache_dirty;
+
+    /* Linked list of inodes, sorted by access/modification times for cache
+     * management.  Editing these lists is protected by the filesystem lock; to
+     * avoid deadlock do not attempt to take any other locks while the FS lock
+     * is held for list editing purposes.  Items at the head of the list are
+     * most recently accessed/modified. */
+    GList dirty_list, accessed_list;
+
+    /* Mutex for the flush daemon, to prevent concurrent execution. */
+    GMutex *flushd_lock;
 } BlueSkyFS;
 
 /* Inode number of the root directory. */
@@ -185,6 +205,12 @@ typedef struct {
     /* Additional state for tracking cache writeback status. */
     uint64_t change_pending;    /* change_count version currently being committed to storage */
 
+    /* Pointers to the linked-list elements for this inode in the accessed and
+     * dirty linked lists.  We re-use the GList structure, using ->next to
+     * point to the head of the list and ->prev to point to the tail.  The data
+     * element is unused. */
+    GList *accessed_list, *dirty_list;
+
     int64_t atime;              /* Microseconds since the Unix epoch */
     int64_t ctime;
     int64_t mtime;
@@ -238,6 +264,8 @@ typedef struct {
 BlueSkyFS *bluesky_init_fs(gchar *name, BlueSkyStore *store);
 void bluesky_superblock_flush(BlueSkyFS *fs);
 
+gboolean bluesky_inode_is_ready(BlueSkyInode *inode);
+
 int64_t bluesky_get_current_time();
 void bluesky_inode_update_ctime(BlueSkyInode *inode, gboolean update_mtime);
 uint64_t bluesky_fs_alloc_inode(BlueSkyFS *fs);
@@ -270,7 +298,9 @@ gint bluesky_dirent_compare(gconstpointer a, gconstpointer b,
                             gpointer unused);
 
 void bluesky_flushd_invoke(BlueSkyFS *fs);
+void bluesky_flushd_invoke_conditional(BlueSkyFS *fs);
 void bluesky_inode_do_sync(BlueSkyInode *inode);
+void bluesky_flushd_thread_launch(BlueSkyFS *fs);
 
 void bluesky_debug_dump(BlueSkyFS *fs);