X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky%2Fbluesky-private.h;h=643092b77f46db2409a41427e7329798805aaf68;hb=83fd6b61a6e092a22d4d5e59ed95f05f5e287f11;hp=0dd6446cd7a9106e53f03cfc3ee0a0f46cce158c;hpb=c6d5eb1086d5da2a2e7548c5ce3b5efa9ba76f0c;p=bluesky.git diff --git a/bluesky/bluesky-private.h b/bluesky/bluesky-private.h index 0dd6446..643092b 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); +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 * help keep track of operations in progress. */ @@ -36,6 +54,7 @@ typedef enum { STORE_OP_GET, STORE_OP_PUT, STORE_OP_DELETE, + STORE_OP_BARRIER, // Waits for other selected operations to complete } BlueSkyStoreOp; typedef enum { @@ -45,7 +64,9 @@ typedef enum { ASYNC_COMPLETE, // Operation finished, results available } BlueSkyAsyncStatus; -typedef struct { +struct BlueSkyNotifierList; +typedef struct _BlueSkyStoreAsync BlueSkyStoreAsync; +struct _BlueSkyStoreAsync { BlueSkyStore *store; GMutex *lock; @@ -60,14 +81,35 @@ typedef struct { BlueSkyRCStr *data; /* Data read/to write */ 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 + * events--occur. Multiple notifiers can be added, but no particular order is + * guaranteed for the notification functions to be called. */ +struct BlueSkyNotifierList { + struct BlueSkyNotifierList *next; + GFunc func; + BlueSkyStoreAsync *async; + gpointer user_data; // Passed to the function when called +}; /* 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); @@ -84,11 +126,156 @@ 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); +void bluesky_store_async_add_notifier(BlueSkyStoreAsync *async, + GFunc func, gpointer user_data); void bluesky_store_async_mark_complete(BlueSkyStoreAsync *async); void bluesky_store_async_submit(BlueSkyStoreAsync *async); +void bluesky_store_sync(BlueSkyStore *store); + +void bluesky_store_add_barrier(BlueSkyStoreAsync *barrier, + BlueSkyStoreAsync *async); + +void bluesky_inode_start_sync(BlueSkyInode *inode); + +void bluesky_block_touch(BlueSkyInode *inode, uint64_t i); +void bluesky_block_fetch(BlueSkyInode *inode, BlueSkyBlock *block, + 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, dirfd; + int seq_num; + GSList *committed; + + /* Cache of log segments which have been memory-mapped. */ + GMutex *mmap_lock; + GHashTable *mmap_cache; +}; + +/* 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); +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 }