X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky%2Fbluesky-private.h;h=643092b77f46db2409a41427e7329798805aaf68;hb=83fd6b61a6e092a22d4d5e59ed95f05f5e287f11;hp=ddf1d343c7ee1dde027c450de2a650fc239ecc2c;hpb=0ba2a52ec1386c8928b397f775e4a4f97339fa2a;p=bluesky.git

diff --git a/bluesky/bluesky-private.h b/bluesky/bluesky-private.h
index ddf1d34..643092b 100644
--- a/bluesky/bluesky-private.h
+++ b/bluesky/bluesky-private.h
@@ -44,7 +44,7 @@ BlueSkyInode *bluesky_list_tail(GList *head);
  * persistent storage. */
 void bluesky_serialize_superblock(GString *out, BlueSkyFS *fs);
 BlueSkyFS *bluesky_deserialize_superblock(const gchar *buf);
-void bluesky_serialize_inode(GString *out, BlueSkyInode *inode);
+BlueSkyCloudLog *bluesky_serialize_inode(BlueSkyInode *inode);
 gboolean bluesky_deserialize_inode(BlueSkyInode *inode, const gchar *buf);
 
 /* Storage layer.  Requests can be performed asynchronously, so these objects
@@ -139,37 +139,143 @@ void bluesky_store_sync(BlueSkyStore *store);
 void bluesky_store_add_barrier(BlueSkyStoreAsync *barrier,
                                BlueSkyStoreAsync *async);
 
-void bluesky_inode_start_sync(BlueSkyInode *inode, BlueSkyStoreAsync *barrier);
+void bluesky_inode_start_sync(BlueSkyInode *inode);
 
 void bluesky_block_touch(BlueSkyInode *inode, uint64_t i);
-void bluesky_block_fetch(BlueSkyFS *fs, BlueSkyBlock *block,
+void bluesky_block_fetch(BlueSkyInode *inode, BlueSkyBlock *block,
                          BlueSkyStoreAsync *barrier);
-void bluesky_block_flush(BlueSkyFS *fs, BlueSkyBlock *block,
-                         BlueSkyStoreAsync *barrier);
-void bluesky_file_flush(BlueSkyInode *inode, BlueSkyStoreAsync *barrier);
+void bluesky_block_flush(BlueSkyInode *inode, BlueSkyBlock *block,
+                         GList **log_items);
+void bluesky_file_flush(BlueSkyInode *inode, GList **log_items);
 void bluesky_file_drop_cached(BlueSkyInode *inode);
 
+/* Writing of data to the cloud in log segments and tracking the location of
+ * various pieces of data (both where in the cloud and where cached locally).
+ * */
+
+typedef struct {
+    char bytes[16];
+} BlueSkyCloudID;
+
+typedef struct {
+    uint32_t directory;
+    uint32_t sequence;
+    uint32_t offset;
+    uint32_t size;
+} BlueSkyCloudPointer;
+
+typedef enum {
+    LOGTYPE_INVALID = -1,
+    LOGTYPE_UNKNOWN = 0,
+    LOGTYPE_DATA = 1,
+    LOGTYPE_INODE = 2,
+    LOGTYPE_INODE_MAP = 3,
+    LOGTYPE_CHECKPOINT = 4,
+    LOGTYPE_CHECKPOINT_PTR = 5,
+} BlueSkyCloudLogType;
+
+/* A record which tracks an object which has been written to a local log,
+ * cached, locally, and/or written to the cloud. */
+#define CLOUDLOG_JOURNAL    0x01
+#define CLOUDLOG_CLOUD      0x02
+#define CLOUDLOG_CACHE      0x04
+struct _BlueSkyCloudLog {
+    gint refcount;
+    GMutex *lock;
+    GCond *cond;
+
+    BlueSkyFS *fs;
+
+    BlueSkyCloudLogType type;
+
+    // Bitmask of CLOUDLOG_* flags indicating where the object exists.
+    int location_flags;
+    int pending_read, pending_write;
+
+    // A stable identifier for the object (only changes when authenticated data
+    // is written out, but stays the same when the in-cloud cleaner relocates
+    // the object).
+    BlueSkyCloudID id;
+
+    // The inode which owns this data, if any, and an offset.
+    uint64_t inum;
+    int32_t inum_offset;
+
+    // The location of the object in the cloud, if available.
+    BlueSkyCloudPointer location;
+
+    // TODO: Location in journal/cache
+    int log_seq, log_offset, log_size;
+
+    // Pointers to other objects.  Each link counts towards the reference count
+    // of the pointed-to object.  To avoid memory leaks there should be no
+    // cycles in the reference graph.
+    GArray *links;
+
+    // Serialized data, if available in memory (otherwise NULL), and a lock
+    // count which tracks if there are users that require the data to be kept
+    // around.
+    BlueSkyRCStr *data;
+    int data_lock_count;
+};
+
+/* Serialize objects into a log segment to be written to the cloud. */
+struct _BlueSkyCloudLogState {
+    GString *data;
+    BlueSkyCloudPointer location;
+    GList *inode_list;
+};
+
+gboolean bluesky_cloudlog_equal(gconstpointer a, gconstpointer b);
+guint bluesky_cloudlog_hash(gconstpointer a);
+BlueSkyCloudLog *bluesky_cloudlog_new(BlueSkyFS *fs);
+gchar *bluesky_cloudlog_id_to_string(BlueSkyCloudID id);
+BlueSkyCloudID bluesky_cloudlog_id_from_string(const gchar *idstr);
+void bluesky_cloudlog_ref(BlueSkyCloudLog *log);
+void bluesky_cloudlog_unref(BlueSkyCloudLog *log);
+void bluesky_cloudlog_stats_update(BlueSkyCloudLog *log, int type);
+void bluesky_cloudlog_sync(BlueSkyCloudLog *log);
+void bluesky_cloudlog_insert(BlueSkyCloudLog *log);
+void bluesky_cloudlog_fetch(BlueSkyCloudLog *log);
+BlueSkyCloudPointer bluesky_cloudlog_serialize(BlueSkyCloudLog *log,
+                                               BlueSkyFS *fs);
+void bluesky_cloudlog_flush(BlueSkyFS *fs);
+
 /* Logging infrastructure for ensuring operations are persistently recorded to
  * disk. */
+#define BLUESKY_CRC32C_SEED (~(uint32_t)0)
+uint32_t crc32c(uint32_t crc, const char *buf, unsigned int length);
+uint32_t crc32c_finalize(uint32_t crc);
+
 struct _BlueSkyLog {
     char *log_directory;
     GAsyncQueue *queue;
-    int fd;
+    int fd, dirfd;
     int seq_num;
+    GSList *committed;
+
+    /* Cache of log segments which have been memory-mapped. */
+    GMutex *mmap_lock;
+    GHashTable *mmap_cache;
 };
 
-typedef struct {
-    gboolean committed;
-    GMutex *lock;
-    GCond *cond;
-    char *key;
-    BlueSkyRCStr *data;
-} BlueSkyLogItem;
+/* Reference-counted blocks of memory, used for passing data in and out of
+ * storage backends and in other places.  This may also refer to read-only
+ * mmaped data. */
+struct _BlueSkyMmap {
+    gint refcount;
+    int log_seq;
+    const char *addr;
+    size_t len;
+    BlueSkyLog *log;
+};
 
 BlueSkyLog *bluesky_log_new(const char *log_directory);
-BlueSkyLogItem *bluesky_log_item_new();
-void bluesky_log_item_submit(BlueSkyLogItem *item, BlueSkyLog *log);
-void bluesky_log_item_finish(BlueSkyLogItem *item);
+void bluesky_log_item_submit(BlueSkyCloudLog *item, BlueSkyLog *log);
+void bluesky_log_finish_all(GList *log_items);
+BlueSkyRCStr *bluesky_log_map_object(BlueSkyLog *log, int log_seq,
+                                     int log_offset, int log_size);
+void bluesky_mmap_unref(BlueSkyMmap *mmap);
 
 #ifdef __cplusplus
 }