X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky%2Fbluesky.h;h=d7750f77f390adf399f6f4e2162a80895cb39410;hb=8a2da0db5d5f4f599486876396883f6207ebec6a;hp=9808434bbbc6f17e2a72ec25e802662d69d2a9d6;hpb=bc90f29d0c20f85e77761dbf2c43aec96848af36;p=bluesky.git

diff --git a/bluesky/bluesky.h b/bluesky/bluesky.h
index 9808434..d7750f7 100644
--- a/bluesky/bluesky.h
+++ b/bluesky/bluesky.h
@@ -17,6 +17,26 @@
 extern "C" {
 #endif
 
+/* Various options to tweak for performance benchmarking purposes. */
+typedef struct {
+    /* Perform all get/put operations synchronously. */
+    int synchronous_stores;
+
+    /* 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;
+
 /* BlueSky status and error codes.  Various frontends should translate these to
  * the appropriate error code for whatever protocol they implement. */
 typedef enum {
@@ -38,6 +58,7 @@ typedef struct {
 } BlueSkyRCStr;
 
 BlueSkyRCStr *bluesky_string_new(gpointer data, gsize len);
+BlueSkyRCStr *bluesky_string_new_from_gstring(GString *s);
 void bluesky_string_ref(BlueSkyRCStr *string);
 void bluesky_string_unref(BlueSkyRCStr *string);
 BlueSkyRCStr *bluesky_string_dup(BlueSkyRCStr *string);
@@ -55,23 +76,6 @@ BlueSkyRCStr *bluesky_crypt_decrypt(BlueSkyRCStr *in, const uint8_t *key);
 
 /* Storage interface.  This presents a key-value store abstraction, and can
  * have multiple implementations: in-memory, on-disk, in-cloud. */
-typedef struct {
-    /* Create a new store instance and return a handle to it. */
-    gpointer (*create)();
-
-    /* Clean up any resources used by this store. */
-    void (*destroy)(gpointer store);
-
-    /* Fetch an item with the given name, or return NULL if not found. */
-    BlueSkyRCStr * (*get)(gpointer store, const gchar *key);
-
-    /* Store an item to the given key name. */
-    void (*put)(gpointer store, const gchar *key, BlueSkyRCStr *val);
-} BlueSkyStoreImplementation;
-
-void bluesky_store_register(const BlueSkyStoreImplementation *impl,
-                            const gchar *name);
-
 struct _BlueSkyStore;
 typedef struct _BlueSkyStore BlueSkyStore;
 
@@ -92,6 +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
@@ -126,6 +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;
@@ -149,6 +164,17 @@ typedef struct {
      * committed to stable storage. */
     uint64_t change_count, change_commit;
 
+    /* Timestamp for controlling when modified data is flushed to stable
+     * storage.  When an inode is first modified from a clean state, this is
+     * set to the current time.  If the inode is clean, it is set to zero. */
+    int64_t change_time;
+
+    /* Last access time to this inode, for controlling cache evictions. */
+    int64_t access_time;
+
+    /* Additional state for tracking cache writeback status. */
+    uint64_t change_pending;    /* change_count version currently being committed to storage */
+
     int64_t atime;              /* Microseconds since the Unix epoch */
     int64_t ctime;
     int64_t mtime;
@@ -163,6 +189,9 @@ typedef struct {
     GHashTable *dirhash;        /* Hash table by name for LOOKUP */
     GHashTable *dirhash_folded; /* As above, but case-folded */
     uint64_t parent_inum;       /* inode for ".."; 0 if the root directory */
+
+    /* Symlink-specific fields */
+    gchar *symlink_contents;
 } BlueSkyInode;
 
 /* A directory entry.  The name is UTF-8 and is a freshly-allocated string.
@@ -202,9 +231,12 @@ 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);
@@ -217,7 +249,6 @@ void bluesky_directory_dump(BlueSkyInode *dir);
 
 void bluesky_block_touch(BlueSkyInode *inode, uint64_t i);
 void bluesky_block_fetch(BlueSkyFS *fs, BlueSkyBlock *block);
-void bluesky_block_flush(BlueSkyFS *fs, BlueSkyBlock *block);
 void bluesky_file_truncate(BlueSkyInode *inode, uint64_t size);
 void bluesky_file_write(BlueSkyInode *inode, uint64_t offset,
                         const char *data, gint len);
@@ -230,6 +261,11 @@ void bluesky_inode_fetch(BlueSkyFS *fs, uint64_t inum);
 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
 }
 #endif