X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky.h;h=856dd75a6244bce3b1bf22ba65a6f4cb01373abf;hb=d32328c00f54c2f6f4e6eeb8993d33d062e9477c;hp=068173f8c2c2874b06b90487e7102336168224ea;hpb=a6d16121ebce069728e454b9bd4c5716d59c8809;p=bluesky.git

diff --git a/bluesky.h b/bluesky.h
index 068173f..856dd75 100644
--- a/bluesky.h
+++ b/bluesky.h
@@ -12,10 +12,28 @@
 #include <stdint.h>
 #include <glib.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct S3Store;
+
+/* Reference-counted blocks of memory, used for passing data in and out of
+ * storage backends and in other places. */
+typedef struct {
+    gint refcount;
+    gchar *data;
+    gsize len;
+} BlueSkyRCStr;
+
+BlueSkyRCStr *bluesky_string_new(gpointer data, gsize len);
+void bluesky_string_ref(BlueSkyRCStr *string);
+void bluesky_string_unref(BlueSkyRCStr *string);
+BlueSkyRCStr *bluesky_string_dup(BlueSkyRCStr *string);
+
 /* File types.  The numeric values are chosen to match with those used in
  * NFSv3. */
-enum BlueSkyFileType {
-    BLUESKY_INVALID = 0,
+typedef enum {
     BLUESKY_REGULAR = 1,
     BLUESKY_DIRECTORY = 2,
     BLUESKY_BLOCK = 3,
@@ -23,7 +41,7 @@ enum BlueSkyFileType {
     BLUESKY_SYMLINK = 5,
     BLUESKY_SOCKET = 6,
     BLUESKY_FIFO = 7,
-};
+} BlueSkyFileType;
 
 /* Filesystem state.  Each filesystem which is exported is represented by a
  * single bluesky_fs structure in memory. */
@@ -33,8 +51,13 @@ typedef struct {
     gchar *name;                /* Descriptive name for the filesystem */
     GHashTable *inodes;         /* Cached inodes */
     uint64_t next_inum;         /* Next available inode for allocation */
+
+    struct S3Store *store;
 } BlueSkyFS;
 
+/* Inode number of the root directory. */
+#define BLUESKY_ROOT_INUM 1
+
 /* Timestamp, measured in microseconds since the Unix epoch. */
 typedef int64_t bluesky_time;
 
@@ -45,7 +68,9 @@ typedef struct {
     gint refcnt;                /* May be accessed atomically without lock */
     GMutex *lock;
 
-    int type;
+    BlueSkyFS *fs;
+
+    BlueSkyFileType type;
     uint32_t mode;
     uint32_t uid, gid;
     uint32_t nlink;
@@ -63,24 +88,52 @@ typedef struct {
 
     /* File-specific fields */
     uint64_t size;
+    GArray *blocks;
 
     /* Directory-specific fields */
-    GSequence *dirents;
+    GSequence *dirents;         /* List of entries for READDIR */
+    GHashTable *dirhash;        /* Hash table by name for LOOKUP */
+    uint64_t parent_inum;       /* inode for ".."; 0 if the root directory */
 } BlueSkyInode;
 
 /* A directory entry.  The name is UTF-8 and is a freshly-allocated string.
- * The name is hashed to a 64-bit value, and the directory entries are sorted
- * by hash value (the hash value can then be used as a cookie for resuming a
- * READDIR call). */
+ * Each directory entry is listed in two indices: dirents is indexed by cookie
+ * and dirhash by name.  The cookie is a randomly-assigned 32-bit value, unique
+ * within the directory, that remains unchanged until the entry is deleted.  It
+ * is used to provide a stable key for restarting a READDIR call. */
 typedef struct {
     gchar *name;
-    uint64_t hash;
+    uint32_t cookie;
     uint64_t inum;
-} BlueSkyDirent ;
+} BlueSkyDirent;
+
+/* File data is divided into fixed-size blocks (except the last block which may
+ * be short?).  These blocks are backed by storage in a key/value store, but
+ * may also be dirty if modifications have been made in-memory that have not
+ * been committed. */
+#define BLUESKY_BLOCK_SIZE 32768ULL
+#define BLUESKY_MAX_FILE_SIZE (BLUESKY_BLOCK_SIZE << 24)
+typedef enum {
+    BLUESKY_BLOCK_ZERO = 0,     /* Data is all zeroes, not explicitly stored */
+    BLUESKY_BLOCK_REF = 1,      /* Reference to key/value store, not cached */
+    BLUESKY_BLOCK_CACHED = 2,   /* Data is cached in memory, clean */
+    BLUESKY_BLOCK_DIRTY = 3,    /* Data needs to be committed to store */
+} BlueSkyBlockType;
+
+typedef struct {
+    BlueSkyBlockType type;
+    gchar *ref;                 /* Name of data block in the backing store */
+    BlueSkyRCStr *data;         /* Pointer to data in memory if cached */
+} BlueSkyBlock;
 
+BlueSkyFS *bluesky_new_fs(gchar *name);
 int64_t bluesky_get_current_time();
+void bluesky_inode_update_ctime(BlueSkyInode *inode, gboolean update_mtime);
 uint64_t bluesky_fs_alloc_inode(BlueSkyFS *fs);
-BlueSkyInode *bluesky_new_inode(uint64_t inum);
+BlueSkyInode *bluesky_new_inode(uint64_t inum, BlueSkyFS *fs, BlueSkyFileType type);
+
+BlueSkyInode *bluesky_get_inode(BlueSkyFS *fs, uint64_t inum);
+void bluesky_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode);
 
 void bluesky_dirent_destroy(gpointer dirent);
 uint64_t bluesky_directory_hash(gchar *name);
@@ -89,4 +142,21 @@ gboolean bluesky_directory_insert(BlueSkyInode *dir, 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);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif