X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky%2Fbluesky.h;h=e30f5b0c95329da1ff5ea6923a680ac23f2d91ee;hb=349ac2f2bcc67551a5bb946c73c650501228f056;hp=74088497db141ef9c471c7f0627685e6114d1151;hpb=98effa493bca2b6e97d98035be602993da27d26b;p=bluesky.git diff --git a/bluesky/bluesky.h b/bluesky/bluesky.h index 7408849..e30f5b0 100644 --- a/bluesky/bluesky.h +++ b/bluesky/bluesky.h @@ -17,6 +17,34 @@ extern "C" { #endif +/* Various options to tweak for performance benchmarking purposes. */ +typedef struct { + /* Perform all get/put operations synchronously. */ + int synchronous_stores; + + /* Write data in cache immediately after file is modified. */ + int writethrough_cache; + + /* Can inodes be fetched asynchronously? (Inode object is initially + * created in a pending state, and not unlocked until the data is actually + * available.) */ + int sync_inode_fetches; + + /* Should frontends handle requests serially or allow operations to proceed + * in parallel? */ + int sync_frontends; +} BlueSkyOptions; + +extern BlueSkyOptions bluesky_options; + +/* BlueSky status and error codes. Various frontends should translate these to + * the appropriate error code for whatever protocol they implement. */ +typedef enum { + BSTATUS_OK = 0, /* No error */ + BSTATUS_IOERR, /* I/O error of some form */ + BSTATUS_NOENT, /* File does not exist */ +} BlueSkyStatus; + void bluesky_init(void); gchar *bluesky_lowercase(const gchar *s); @@ -30,9 +58,11 @@ typedef struct { } BlueSkyRCStr; BlueSkyRCStr *bluesky_string_new(gpointer data, gsize len); +BlueSkyRCStr *bluesky_string_new_from_gstring(GString *s); void bluesky_string_ref(BlueSkyRCStr *string); void bluesky_string_unref(BlueSkyRCStr *string); BlueSkyRCStr *bluesky_string_dup(BlueSkyRCStr *string); +void bluesky_string_resize(BlueSkyRCStr *string, gsize len); /* Cryptographic operations. */ #define CRYPTO_BLOCK_SIZE 16 /* 128-bit AES */ @@ -46,23 +76,6 @@ BlueSkyRCStr *bluesky_crypt_decrypt(BlueSkyRCStr *in, const uint8_t *key); /* Storage interface. This presents a key-value store abstraction, and can * have multiple implementations: in-memory, on-disk, in-cloud. */ -typedef struct { - /* Create a new store instance and return a handle to it. */ - gpointer (*create)(); - - /* Clean up any resources used by this store. */ - void (*destroy)(gpointer store); - - /* Fetch an item with the given name, or return NULL if not found. */ - BlueSkyRCStr * (*get)(gpointer store, const gchar *key); - - /* Store an item to the given key name. */ - void (*put)(gpointer store, const gchar *key, BlueSkyRCStr *val); -} BlueSkyStoreImplementation; - -void bluesky_store_register(const BlueSkyStoreImplementation *impl, - const gchar *name); - struct _BlueSkyStore; typedef struct _BlueSkyStore BlueSkyStore; @@ -83,6 +96,10 @@ typedef enum { BLUESKY_SYMLINK = 5, BLUESKY_SOCKET = 6, BLUESKY_FIFO = 7, + + /* Special types used only internally. */ + BLUESKY_PENDING = 0, /* Inode being loaded; type not yet determined */ + BLUESKY_INVALID = -1, /* Inode is invalid (failed to load) */ } BlueSkyFileType; /* Filesystem state. Each filesystem which is exported is represented by a @@ -117,6 +134,13 @@ bluesky_time_hires bluesky_now_hires(); * dropping from the cache. * - Any pending operations should hold extra references to the inode as * appropriate to keep it available until the operation completes. + * - Locking dependency order is, when multiple locks are to be acquired, to + * acquire locks on parents in the filesystem tree before children. + * (TODO: What about rename when we acquire locks in unrelated parts of the + * filesystem?) + * - An inode should not be locked while the filesystem lock is already held, + * since some code may do an inode lookup (which acquires the filesystem + * lock) while a different inode is locked. * */ typedef struct { GMutex *lock; @@ -140,6 +164,17 @@ typedef struct { * committed to stable storage. */ uint64_t change_count, change_commit; + /* Timestamp for controlling when modified data is flushed to stable + * storage. When an inode is first modified from a clean state, this is + * set to the current time. If the inode is clean, it is set to zero. */ + int64_t change_time; + + /* Last access time to this inode, for controlling cache evictions. */ + int64_t access_time; + + /* Additional state for tracking cache writeback status. */ + uint64_t change_pending; /* change_count version currently being committed to storage */ + int64_t atime; /* Microseconds since the Unix epoch */ int64_t ctime; int64_t mtime; @@ -154,6 +189,9 @@ typedef struct { GHashTable *dirhash; /* Hash table by name for LOOKUP */ GHashTable *dirhash_folded; /* As above, but case-folded */ uint64_t parent_inum; /* inode for ".."; 0 if the root directory */ + + /* Symlink-specific fields */ + gchar *symlink_contents; } BlueSkyInode; /* A directory entry. The name is UTF-8 and is a freshly-allocated string. @@ -193,21 +231,22 @@ void bluesky_superblock_flush(BlueSkyFS *fs); int64_t bluesky_get_current_time(); void bluesky_inode_update_ctime(BlueSkyInode *inode, gboolean update_mtime); uint64_t bluesky_fs_alloc_inode(BlueSkyFS *fs); +void bluesky_init_inode(BlueSkyInode *i, BlueSkyFileType type); BlueSkyInode *bluesky_new_inode(uint64_t inum, BlueSkyFS *fs, BlueSkyFileType type); BlueSkyInode *bluesky_get_inode(BlueSkyFS *fs, uint64_t inum); +void bluesky_inode_ref(BlueSkyInode *inode); +void bluesky_inode_unref(BlueSkyInode *inode); void bluesky_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode); void bluesky_dirent_destroy(gpointer dirent); uint64_t bluesky_directory_lookup(BlueSkyInode *inode, gchar *name); uint64_t bluesky_directory_ilookup(BlueSkyInode *inode, gchar *name); +BlueSkyDirent *bluesky_directory_read(BlueSkyInode *dir, uint32_t cookie); gboolean bluesky_directory_insert(BlueSkyInode *dir, const gchar *name, uint64_t inum); void bluesky_directory_dump(BlueSkyInode *dir); -void bluesky_block_touch(BlueSkyInode *inode, uint64_t i); -void bluesky_block_fetch(BlueSkyFS *fs, BlueSkyBlock *block); -void bluesky_block_flush(BlueSkyFS *fs, BlueSkyBlock *block); void bluesky_file_truncate(BlueSkyInode *inode, uint64_t size); void bluesky_file_write(BlueSkyInode *inode, uint64_t offset, const char *data, gint len); @@ -220,6 +259,11 @@ void bluesky_inode_fetch(BlueSkyFS *fs, uint64_t inum); gint bluesky_dirent_compare(gconstpointer a, gconstpointer b, gpointer unused); +void bluesky_flushd_invoke(BlueSkyFS *fs); +void bluesky_inode_do_sync(BlueSkyInode *inode); + +void bluesky_debug_dump(BlueSkyFS *fs); + #ifdef __cplusplus } #endif