* 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;
+/* Maximum number of threads to use in any particular thread pool, or -1 for no
+ * limit */
+extern int bluesky_max_threads;
+
/* BlueSky status and error codes. Various frontends should translate these to
* the appropriate error code for whatever protocol they implement. */
typedef enum {
uint64_t next_inum; /* Next available inode for allocation */
BlueSkyStore *store;
+
+ /* Accounting for memory used for caches. Space is measured in blocks, not
+ * bytes. We track both total data in the caches and dirty data (total
+ * data includes dirty data). Updates to these variables must be made
+ * atomically. */
+ gint cache_total, cache_dirty;
} BlueSkyFS;
/* Inode number of the root directory. */
* 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 */
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_file_truncate(BlueSkyInode *inode, uint64_t size);
void bluesky_file_write(BlueSkyInode *inode, uint64_t offset,
const char *data, gint len);