Start work on log replay for filesystem recovery.

[bluesky.git] / bluesky / inode.c

diff --git a/bluesky/inode.c b/bluesky/inode.c
index 9d72f4d..b8ab4e8 100644 (file)
--- a/bluesky/inode.c
+++ b/bluesky/inode.c
@@ -50,8 +50,6 @@ void bluesky_inode_update_ctime(BlueSkyInode *inode, gboolean update_mtime)
     g_mutex_lock(inode->fs->lock);
     bluesky_list_unlink(&inode->fs->unlogged_list, inode->unlogged_list);
     inode->unlogged_list = bluesky_list_prepend(&inode->fs->unlogged_list, inode);
-    bluesky_list_unlink(&inode->fs->dirty_list, inode->dirty_list);
-    inode->dirty_list = bluesky_list_prepend(&inode->fs->dirty_list, inode);
     bluesky_list_unlink(&inode->fs->accessed_list, inode->accessed_list);
     inode->accessed_list = bluesky_list_prepend(&inode->fs->accessed_list, inode);
     g_mutex_unlock(inode->fs->lock);
@@ -88,8 +86,10 @@ BlueSkyFS *bluesky_new_fs(gchar *name)
     fs->next_inum = BLUESKY_ROOT_INUM + 1;
     fs->store = bluesky_store_new("file");
     fs->flushd_lock = g_mutex_new();
+    fs->flushd_cond = g_cond_new();
     fs->locations = g_hash_table_new(bluesky_cloudlog_hash,
                                      bluesky_cloudlog_equal);
+    fs->inode_map = g_sequence_new(NULL);
 
     fs->log_state = g_new0(BlueSkyCloudLogState, 1);
     fs->log_state->data = g_string_new("");
@@ -105,6 +105,7 @@ BlueSkyFS *bluesky_init_fs(gchar *name, BlueSkyStore *store)
         if (fs != NULL) {
             fs->store = store;
             fs->log = bluesky_log_new("journal");
+            fs->log->fs = fs;
             g_print("Loaded filesystem superblock\n");
             g_free(fs->name);
             fs->name = g_strdup(name);
@@ -117,6 +118,7 @@ BlueSkyFS *bluesky_init_fs(gchar *name, BlueSkyStore *store)
     BlueSkyFS *fs = bluesky_new_fs(name);
     fs->store = store;
     fs->log = bluesky_log_new("journal");
+    fs->log->fs = fs;
 
     BlueSkyInode *root = bluesky_new_inode(BLUESKY_ROOT_INUM, fs,
                                            BLUESKY_DIRECTORY);
@@ -128,6 +130,8 @@ BlueSkyFS *bluesky_init_fs(gchar *name, BlueSkyStore *store)
     bluesky_inode_do_sync(root);
     bluesky_superblock_flush(fs);
 
+    bluesky_replay(fs);
+
     return fs;
 }
 
@@ -173,8 +177,8 @@ void bluesky_inode_unref(BlueSkyInode *inode)
                 if (b->type == BLUESKY_BLOCK_DIRTY) {
                     g_error("Deleting an inode with dirty file data!");
                 }
-                bluesky_cloudlog_unref(b->cloudref);
-                bluesky_string_unref(b->data);
+                bluesky_cloudlog_unref(b->ref);
+                bluesky_string_unref(b->dirty);
             }
             g_array_unref(inode->blocks);
             break;
@@ -292,46 +296,36 @@ void bluesky_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode)
 void bluesky_inode_start_sync(BlueSkyInode *inode)
 {
     GList *log_items = NULL;
-    BlueSkyFS *fs = inode->fs;
 
     if (inode->type == BLUESKY_REGULAR)
         bluesky_file_flush(inode, &log_items);
 
-    GString *buf = g_string_new("");
-    bluesky_serialize_inode(buf, inode);
-    BlueSkyRCStr *data = bluesky_string_new_from_gstring(buf);
-
-    char key[64];
-    sprintf(key, "inode-%016"PRIx64, inode->inum);
-
-    BlueSkyCloudLog *cloudlog = bluesky_cloudlog_new(fs);
-    cloudlog->type = LOGTYPE_INODE;
-    cloudlog->inum = inode->inum;
-    cloudlog->data = data;
-    bluesky_string_ref(data);
-
-    if (inode->type == BLUESKY_REGULAR) {
-        for (int i = 0; i < inode->blocks->len; i++) {
-            BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock, i);
-            if (b->type == BLUESKY_BLOCK_CACHED
-                || b->type == BLUESKY_BLOCK_REF)
-            {
-                BlueSkyCloudID id = b->cloudref->id;
-                g_array_append_val(cloudlog->pointers, id);
-            }
-        }
-    }
+    BlueSkyCloudLog *cloudlog = bluesky_serialize_inode(inode);
 
-    if (inode->committed_item != NULL)
-        bluesky_cloudlog_unref(inode->committed_item);
+    bluesky_cloudlog_unref(inode->committed_item);
     inode->committed_item = cloudlog;
 
     bluesky_cloudlog_sync(cloudlog);
+    bluesky_cloudlog_ref(cloudlog);
     log_items = g_list_prepend(log_items, cloudlog);
-    bluesky_cloudlog_insert(cloudlog);
 
     /* Wait for all log items to be committed to disk. */
     bluesky_log_finish_all(log_items);
+
+    /* Mark the inode as clean */
+    inode->change_commit = inode->change_count;
+    inode->change_time = 0;
+    g_mutex_lock(inode->fs->lock);
+    bluesky_list_unlink(&inode->fs->unlogged_list, inode->unlogged_list);
+    inode->unlogged_list = NULL;
+
+    /* Since a new version of the inode has been written to the log, also
+     * schedule a future flush of the new data to cloud storage. */
+    bluesky_list_unlink(&inode->fs->dirty_list, inode->dirty_list);
+    inode->dirty_list = bluesky_list_prepend(&inode->fs->dirty_list, inode);
+    inode->change_cloud = inode->change_count;
+
+    g_mutex_unlock(inode->fs->lock);
 }
 
 /* Write back an inode and all associated data and wait for completion.  Inode