X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky%2Fbluesky-private.h;h=822e029b9d004edbd7b5933af650ae5f865fa59d;hb=60b4792d65ba4b2a45733894f6a57e6581ddc487;hp=d5e5d4fb74bd7967d00d034ce8d304ce06ce822b;hpb=b34b242b34388a3eb26bad5135cdf629ab69b70a;p=bluesky.git diff --git a/bluesky/bluesky-private.h b/bluesky/bluesky-private.h index d5e5d4f..822e029 100644 --- a/bluesky/bluesky-private.h +++ b/bluesky/bluesky-private.h @@ -19,15 +19,33 @@ extern "C" { #endif +extern int bluesky_verbose; + +/* Target cache size levels. */ +extern int bluesky_watermark_low_dirty; +extern int bluesky_watermark_medium_dirty; +extern int bluesky_watermark_high_dirty; + +extern int bluesky_watermark_low_total; +extern int bluesky_watermark_medium_total; +extern int bluesky_watermark_high_total; + /* TODO: Make this go away entirely. */ BlueSkyFS *bluesky_new_fs(gchar *name); +/* Linked list update functions for LRU lists. */ +void bluesky_list_unlink(GList *head, GList *item); +GList *bluesky_list_prepend(GList *head, BlueSkyInode *inode); +GList *bluesky_list_append(GList *head, BlueSkyInode *inode); +BlueSkyInode *bluesky_list_head(GList *head); +BlueSkyInode *bluesky_list_tail(GList *head); + /* Serialization and deserialization of filesystem data for storing to * 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); -BlueSkyInode *bluesky_deserialize_inode(BlueSkyFS *fs, const gchar *buf); +gboolean bluesky_deserialize_inode(BlueSkyInode *inode, const gchar *buf); /* Storage layer. Requests can be performed asynchronously, so these objects * help keep track of operations in progress. */ @@ -47,7 +65,8 @@ typedef enum { } BlueSkyAsyncStatus; struct BlueSkyNotifierList; -typedef struct { +typedef struct _BlueSkyStoreAsync BlueSkyStoreAsync; +struct _BlueSkyStoreAsync { BlueSkyStore *store; GMutex *lock; @@ -63,9 +82,18 @@ typedef struct { int result; /* Result code; 0 for success. */ struct BlueSkyNotifierList *notifiers; + gint notifier_count; + + /* The barrier waiting on this operation. Support for more than one + * barrier for a single async is not well-supported and should be avoided + * if possible. */ + BlueSkyStoreAsync *barrier; + + bluesky_time_hires start_time; /* Time operation was submitted. */ + bluesky_time_hires exec_time; /* Time processing started on operation. */ gpointer store_private; /* For use by the storage implementation */ -} BlueSkyStoreAsync; +}; /* Support for notification lists. These are lists of one-shot functions which * can be called when certain events--primarily, competed storage @@ -81,7 +109,7 @@ struct BlueSkyNotifierList { /* The abstraction layer for storage, allowing multiple implementations. */ typedef struct { /* Create a new store instance and return a handle to it. */ - gpointer (*create)(); + gpointer (*create)(const gchar *path); /* Clean up any resources used by this store. */ void (*destroy)(gpointer store); @@ -98,6 +126,7 @@ void bluesky_store_register(const BlueSkyStoreImplementation *impl, const gchar *name); BlueSkyStoreAsync *bluesky_store_async_new(BlueSkyStore *store); +gpointer bluesky_store_async_get_handle(BlueSkyStoreAsync *async); void bluesky_store_async_ref(BlueSkyStoreAsync *async); void bluesky_store_async_unref(BlueSkyStoreAsync *async); void bluesky_store_async_wait(BlueSkyStoreAsync *async); @@ -112,9 +141,111 @@ void bluesky_store_add_barrier(BlueSkyStoreAsync *barrier, void bluesky_inode_start_sync(BlueSkyInode *inode, BlueSkyStoreAsync *barrier); -void bluesky_block_flush(BlueSkyFS *fs, BlueSkyBlock *block, +void bluesky_block_touch(BlueSkyInode *inode, uint64_t i); +void bluesky_block_fetch(BlueSkyFS *fs, BlueSkyBlock *block, BlueSkyStoreAsync *barrier); -void bluesky_file_flush(BlueSkyInode *inode, BlueSkyStoreAsync *barrier); +void bluesky_block_flush(BlueSkyFS *fs, BlueSkyBlock *block, + BlueSkyStoreAsync *barrier, GList **log_items); +void bluesky_file_flush(BlueSkyInode *inode, BlueSkyStoreAsync *barrier, + GList **log_items); +void bluesky_file_drop_cached(BlueSkyInode *inode); + +/* 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 seq_num; +}; + +typedef struct { + gboolean committed; + GMutex *lock; + GCond *cond; + char *key; + BlueSkyRCStr *data; +} BlueSkyLogItem; + +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); + +/* 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_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_CACHE 0x02 +#define CLOUDLOG_CLOUD 0x04 +typedef struct { + gint refcount; + + BlueSkyFS *fs; + + BlueSkyCloudLogType type; + + // Bitmask of CLOUDLOG_* flags indicating where the object exists. + int location_flags; + + // 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 + + // Pointers to other objects + GArray *pointers; + + // Serialized data, if available in memory (otherwise NULL). + BlueSkyRCStr *data; +} BlueSkyCloudLog; + +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); +BlueSkyLogItem *bluesky_cloudlog_sync(BlueSkyCloudLog *log); +void bluesky_cloudlog_insert(BlueSkyCloudLog *log); +void bluesky_cloudlog_write_log(BlueSkyFS *fs); #ifdef __cplusplus }