X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky%2Fbluesky-private.h;h=e5b5b583919576614862bb79eb2cd2df06c86610;hb=a82b60b3b683840a7074110831bcbaa16a40f0eb;hp=636b664600f4f91db28eb246c11305c56750f965;hpb=870ff381b99c54615457d1cea92e710bc68e194b;p=bluesky.git diff --git a/bluesky/bluesky-private.h b/bluesky/bluesky-private.h index 636b664..e5b5b58 100644 --- a/bluesky/bluesky-private.h +++ b/bluesky/bluesky-private.h @@ -224,6 +224,8 @@ struct _BlueSkyCloudLogState { 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); @@ -248,15 +250,27 @@ 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 @@ -265,16 +279,18 @@ struct _BlueSkyLog { 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 refcount; // References to the mmaped data + 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; + 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); @@ -283,6 +299,56 @@ void bluesky_log_finish_all(GList *log_items); 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); + +/* 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 location where this inode map section is stored in the cloud. */ + BlueSkyCloudPointer location; + + /* 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); #ifdef __cplusplus }