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_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
* 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;
* 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 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);
gpointer unused);
void bluesky_flushd_invoke(BlueSkyFS *fs);
+void bluesky_inode_do_sync(BlueSkyInode *inode);
+
+void bluesky_debug_dump(BlueSkyFS *fs);
#ifdef __cplusplus
}