#define _BLUESKY_H
#include <stdint.h>
+#include <inttypes.h>
#include <glib.h>
#ifdef __cplusplus
extern "C" {
#endif
-struct S3Store;
+/* 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;
+} 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);
/* Reference-counted blocks of memory, used for passing data in and out of
* storage backends and in other places. */
} 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 */
+#define CRYPTO_KEY_SIZE 16
+
+void bluesky_crypt_init();
+void bluesky_crypt_hash_key(const char *keystr, uint8_t *out);
+void bluesky_crypt_random_bytes(guchar *buf, gint len);
+BlueSkyRCStr *bluesky_crypt_encrypt(BlueSkyRCStr *in, const uint8_t *key);
+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. */
+struct _BlueSkyStore;
+typedef struct _BlueSkyStore BlueSkyStore;
+
+void bluesky_store_init();
+BlueSkyStore *bluesky_store_new(const gchar *type);
+void bluesky_store_free(BlueSkyStore *store);
+BlueSkyRCStr *bluesky_store_get(BlueSkyStore *store, const gchar *key);
+void bluesky_store_put(BlueSkyStore *store,
+ const gchar *key, BlueSkyRCStr *val);
/* File types. The numeric values are chosen to match with those used in
* NFSv3. */
GHashTable *inodes; /* Cached inodes */
uint64_t next_inum; /* Next available inode for allocation */
- struct S3Store *store;
+ BlueSkyStore *store;
} BlueSkyFS;
/* Inode number of the root directory. */
/* Timestamp, measured in microseconds since the Unix epoch. */
typedef int64_t bluesky_time;
+/* High-resolution timer, measured in nanoseconds. */
+typedef int64_t bluesky_time_hires;
+bluesky_time_hires bluesky_now_hires();
+
/* In-memory representation of an inode within a Blue Sky server. This
* corresponds roughly with information that is committed to persistent
- * storage. */
+ * storage. Locking/refcounting rules:
+ * - To access or modify any data fields, the lock must be held. This
+ * includes file blocks.
+ * - One reference is held by the BlueSkyFS inode hash table. If that is the
+ * only reference (and the inode is unlocked), the inode is subject to
+ * dropping from the cache.
+ * - Any pending operations should hold extra references to the inode as
+ * appropriate to keep it available until the operation completes.
+ * */
typedef struct {
- gint refcnt; /* May be accessed atomically without lock */
GMutex *lock;
+ gint refcount;
BlueSkyFS *fs;
* that we don't exhaust the identifier space. */
uint64_t inum;
- uint64_t change_count; /* Incremented each with each change made */
+ /* change_count is increased with every operation which modifies the inode,
+ * and can be used to determine if cached data is still valid.
+ * change_commit is the value of change_count when the inode was last
+ * 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;
+
+ /* 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;
/* Directory-specific fields */
GSequence *dirents; /* List of entries for READDIR */
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.
* is used to provide a stable key for restarting a READDIR call. */
typedef struct {
gchar *name;
+ gchar *name_folded; /* Name, folded for case-insensitive lookup */
uint32_t cookie;
uint64_t inum;
} BlueSkyDirent;
BlueSkyRCStr *data; /* Pointer to data in memory if cached */
} BlueSkyBlock;
-BlueSkyFS *bluesky_new_fs(gchar *name);
+BlueSkyFS *bluesky_init_fs(gchar *name, BlueSkyStore *store);
+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_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode);
void bluesky_dirent_destroy(gpointer dirent);
-uint64_t bluesky_directory_hash(gchar *name);
uint64_t bluesky_directory_lookup(BlueSkyInode *inode, gchar *name);
-gboolean bluesky_directory_insert(BlueSkyInode *dir, 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);
void bluesky_file_read(BlueSkyInode *inode, uint64_t offset,
char *buf, gint len);
-struct S3Store *s3store_new();
-BlueSkyRCStr *s3store_get(struct S3Store *store, const gchar *key);
-void s3store_put(struct S3Store *store, const gchar *key, BlueSkyRCStr *val);
+void bluesky_inode_flush(BlueSkyFS *fs, BlueSkyInode *inode);
+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_debug_dump(BlueSkyFS *fs);
#ifdef __cplusplus
}
projects / bluesky.git / blobdiff