/* TODO: Make this go away entirely. */
BlueSkyFS *bluesky_new_fs(gchar *name);
+void bluesky_inode_free_resources(BlueSkyInode *inode);
+
/* Linked list update functions for LRU lists. */
void bluesky_list_unlink(GList *head, GList *item);
GList *bluesky_list_prepend(GList *head, BlueSkyInode *inode);
* 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);
-gboolean bluesky_deserialize_inode(BlueSkyInode *inode, const gchar *buf);
+BlueSkyCloudLog *bluesky_serialize_inode(BlueSkyInode *inode);
+gboolean bluesky_deserialize_inode(BlueSkyInode *inode, BlueSkyCloudLog *item);
+
+void bluesky_deserialize_cloudlog(BlueSkyCloudLog *item,
+ const char *data,
+ size_t len);
+
+void bluesky_serialize_cloudlog(BlueSkyCloudLog *log,
+ GString *encrypted,
+ GString *authenticated,
+ GString *writable);
/* Storage layer. Requests can be performed asynchronously, so these objects
* help keep track of operations in progress. */
/* Clean up any implementation-private data in a BlueSkyStoreAsync. */
void (*cleanup)(gpointer store, BlueSkyStoreAsync *async);
+
+ /* Find the lexicographically-largest file starting with the specified
+ * prefix. */
+ char * (*lookup_last)(gpointer store, const gchar *prefix);
} BlueSkyStoreImplementation;
void bluesky_store_register(const BlueSkyStoreImplementation *impl,
const gchar *name);
+char *bluesky_store_lookup_last(BlueSkyStore *store, const char *prefix);
BlueSkyStoreAsync *bluesky_store_async_new(BlueSkyStore *store);
gpointer bluesky_store_async_get_handle(BlueSkyStoreAsync *async);
void bluesky_store_async_ref(BlueSkyStoreAsync *async);
} 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,
+
+ /* Used only as metadata in the local journal, not loaded as a
+ * BlueSkyCloudLogState nor stored in the cloud */
+ LOGTYPE_JOURNAL_MARKER = 16,
+ LOGTYPE_JOURNAL_CHECKPOINT = 17,
} BlueSkyCloudLogType;
+/* Headers that go on items in local log segments and cloud log segments. */
+struct log_header {
+ uint32_t magic; // HEADER_MAGIC
+ uint8_t type; // Object type + '0'
+ uint32_t offset; // Starting byte offset of the log header
+ uint32_t size1; // Size of the data item (bytes)
+ uint32_t size2; //
+ uint32_t size3; //
+ uint64_t inum; // Inode which owns this data, if any
+ BlueSkyCloudID id; // Object identifier
+} __attribute__((packed));
+
+struct log_footer {
+ uint32_t magic; // FOOTER_MAGIC
+ uint32_t crc; // Computed from log_header to log_footer.magic
+} __attribute__((packed));
+
+struct cloudlog_header {
+ char magic[4];
+ uint8_t crypt_auth[CRYPTO_HASH_SIZE];
+ uint8_t crypt_iv[CRYPTO_BLOCK_SIZE];
+ uint8_t type;
+ BlueSkyCloudID id;
+ uint64_t inum;
+ uint32_t size1, size2, size3;
+} __attribute__((packed));
+
+#define JOURNAL_MAGIC "\nLog"
+#define CLOUDLOG_MAGIC "AgI-"
+
/* 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
uint64_t inum;
int32_t inum_offset;
+ // The size of encrypted object data, not including any headers
+ int data_size;
+
// 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
- GArray *pointers;
+ // 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).
+ // 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. */
GString *data;
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);
guint bluesky_cloudlog_hash(gconstpointer a);
-BlueSkyCloudLog *bluesky_cloudlog_new(BlueSkyFS *fs);
+BlueSkyCloudLog *bluesky_cloudlog_new(BlueSkyFS *fs, const BlueSkyCloudID *id);
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_write_log(BlueSkyFS *fs);
+BlueSkyCloudLog *bluesky_cloudlog_get(BlueSkyFS *fs, BlueSkyCloudID id);
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)
+#define BLUESKY_CRC32C_VALIDATOR ((uint32_t)0xb798b438UL)
uint32_t crc32c(uint32_t crc, const char *buf, unsigned int length);
uint32_t crc32c_finalize(uint32_t crc);
struct _BlueSkyLog {
+ BlueSkyFS *fs;
char *log_directory;
GAsyncQueue *queue;
int fd, dirfd;
int seq_num;
GSList *committed;
+ /* The currently-open log file. */
+ BlueSkyCacheFile *current_log;
+
/* Cache of log segments which have been memory-mapped. */
GMutex *mmap_lock;
GHashTable *mmap_cache;
+
+ /* 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
+ * journal for filesystem consistency or log segments which have been fetched
+ * back from cloud storage. */
+struct _BlueSkyCacheFile {
+ GMutex *lock;
+ GCond *cond;
+ gint refcount;
+ int type; // Only one of CLOUDLOG_{JOURNAL,CLOUD}
+ int log_dir;
+ int log_seq;
+ char *filename; // Local filename, relateive to log directory
+ gint mapcount; // References to the mmaped data
+ const char *addr; // May be null if data is not mapped in memory
+ size_t len;
+ BlueSkyFS *fs;
+ BlueSkyLog *log;
+ gboolean fetching, ready; // Cloud data: downloading or ready for use
+ int64_t atime; // Access time, for cache management
};
BlueSkyLog *bluesky_log_new(const char *log_directory);
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,
+BlueSkyCloudLog *bluesky_log_get_commit_point(BlueSkyFS *fs);
+void bluesky_log_write_commit_point(BlueSkyFS *fs, BlueSkyCloudLog *marker);
+
+BlueSkyRCStr *bluesky_log_map_object(BlueSkyFS *fs, int log_dir, int log_seq,
int log_offset, int log_size);
+void bluesky_mmap_unref(BlueSkyCacheFile *mmap);
+void bluesky_cachefile_unref(BlueSkyCacheFile *cachefile);
+
+BlueSkyCacheFile *bluesky_cachefile_lookup(BlueSkyFS *fs,
+ int clouddir, int log_seq);
+void bluesky_cachefile_gc(BlueSkyFS *fs);
+
+void bluesky_replay(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 serialized version of the inode map data. */
+ BlueSkyCloudLog *serialized;
+
+ /* 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);
+BlueSkyCloudLog *bluesky_inode_map_serialize(BlueSkyFS *fs);
+
+gboolean bluesky_checkpoint_load(BlueSkyFS *fs);
#ifdef __cplusplus
}
projects / bluesky.git / blobdiff