Create a runtime option for sync/async frontend request handling.

[bluesky.git] / bluesky / bluesky.h

diff --git a/bluesky/bluesky.h b/bluesky/bluesky.h
index 59814b1..7b8aad2 100644 (file)
--- a/bluesky/bluesky.h
+++ b/bluesky/bluesky.h
@@ -24,6 +24,15 @@ typedef struct {
 
     /* Write data in cache immediately after file is modified. */
     int writethrough_cache;
+
+    /* Can inodes be fetched asynchronously?  (Inode object is initially
+     * created in a pending state, and not unlocked until the data is actually
+     * available.) */
+    int sync_inode_fetches;
+
+    /* Should frontends handle requests serially or allow operations to proceed
+     * in parallel? */
+    int sync_frontends;
 } BlueSkyOptions;
 
 extern BlueSkyOptions bluesky_options;
@@ -87,6 +96,10 @@ typedef enum {
     BLUESKY_SYMLINK = 5,
     BLUESKY_SOCKET = 6,
     BLUESKY_FIFO = 7,
+
+    /* Special types used only internally. */
+    BLUESKY_PENDING = 0,    /* Inode being loaded; type not yet determined */
+    BLUESKY_INVALID = -1,   /* Inode is invalid (failed to load) */
 } BlueSkyFileType;
 
 /* Filesystem state.  Each filesystem which is exported is represented by a
@@ -121,6 +134,13 @@ bluesky_time_hires bluesky_now_hires();
  *     dropping from the cache.
  *   - Any pending operations should hold extra references to the inode as
  *     appropriate to keep it available until the operation completes.
+ *   - Locking dependency order is, when multiple locks are to be acquired, to
+ *     acquire locks on parents in the filesystem tree before children.
+ *     (TODO: What about rename when we acquire locks in unrelated parts of the
+ *     filesystem?)
+ *   - An inode should not be locked while the filesystem lock is already held,
+ *     since some code may do an inode lookup (which acquires the filesystem
+ *     lock) while a different inode is locked.
  * */
 typedef struct {
     GMutex *lock;
@@ -208,9 +228,12 @@ void bluesky_superblock_flush(BlueSkyFS *fs);
 int64_t bluesky_get_current_time();
 void bluesky_inode_update_ctime(BlueSkyInode *inode, gboolean update_mtime);
 uint64_t bluesky_fs_alloc_inode(BlueSkyFS *fs);
+void bluesky_init_inode(BlueSkyInode *i, BlueSkyFileType type);
 BlueSkyInode *bluesky_new_inode(uint64_t inum, BlueSkyFS *fs, BlueSkyFileType type);
 
 BlueSkyInode *bluesky_get_inode(BlueSkyFS *fs, uint64_t inum);
+void bluesky_inode_ref(BlueSkyInode *inode);
+void bluesky_inode_unref(BlueSkyInode *inode);
 void bluesky_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode);
 
 void bluesky_dirent_destroy(gpointer dirent);
@@ -236,6 +259,9 @@ gint bluesky_dirent_compare(gconstpointer a, gconstpointer b,
                             gpointer unused);
 
 void bluesky_flushd_invoke(BlueSkyFS *fs);
+void bluesky_inode_do_sync(BlueSkyInode *inode);
+
+void bluesky_debug_dump(BlueSkyFS *fs);
 
 #ifdef __cplusplus
 }