X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=bluesky%2Finode.c;h=e11bfeb3c0a8b898387f295ffdb4e146b9db93b4;hb=6955b27db8185d222adb07e57d207f7f421037e6;hp=3e92e4f2a7f75f508978081117f52fd3e88fc065;hpb=5b3aafc6c34c798f9ad74539f24c9b278e820163;p=bluesky.git

diff --git a/bluesky/inode.c b/bluesky/inode.c
index 3e92e4f..e11bfeb 100644
--- a/bluesky/inode.c
+++ b/bluesky/inode.c
@@ -42,8 +42,17 @@ void bluesky_inode_update_ctime(BlueSkyInode *inode, gboolean update_mtime)
     if (inode->change_time == 0)
         inode->change_time = now;
 
+#if 0
     if (bluesky_options.writethrough_cache)
         bluesky_file_flush(inode, NULL);
+#endif
+
+    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->accessed_list, inode->accessed_list);
+    inode->accessed_list = bluesky_list_prepend(&inode->fs->accessed_list, inode);
+    g_mutex_unlock(inode->fs->lock);
 }
 
 /* Unfortunately a glib hash table is only guaranteed to be able to store
@@ -76,37 +85,40 @@ BlueSkyFS *bluesky_new_fs(gchar *name)
                                   bluesky_fs_key_equal_func);
     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("");
 
     return fs;
 }
 
 BlueSkyFS *bluesky_init_fs(gchar *name, BlueSkyStore *store)
 {
-    BlueSkyRCStr *data = bluesky_store_get(store, "superblock");
-    if (data != NULL) {
-        BlueSkyFS *fs = bluesky_deserialize_superblock(data->data);
-        if (fs != NULL) {
-            fs->store = store;
-            g_print("Loaded filesystem superblock\n");
-            g_free(fs->name);
-            fs->name = g_strdup(name);
-            return fs;
-        }
-        bluesky_string_unref(data);
-    }
-
-    g_print("Initializing fresh filesystem\n");
     BlueSkyFS *fs = bluesky_new_fs(name);
     fs->store = store;
-
-    BlueSkyInode *root = bluesky_new_inode(BLUESKY_ROOT_INUM, fs,
-                                           BLUESKY_DIRECTORY);
-    root->nlink = 1;
-    root->mode = 0755;
-    bluesky_insert_inode(fs, root);
-
-    bluesky_inode_flush(fs, root);
-    bluesky_superblock_flush(fs);
+    fs->log = bluesky_log_new("journal");
+    fs->log->fs = fs;
+
+    if (bluesky_checkpoint_load(fs)) {
+        g_print("Filesystem checkpoint loaded, starting journal replay...\n");
+        bluesky_replay(fs);
+        g_print("Journal replay complete, filesystem ready.\n");
+    } else {
+        /* Initialize a fresh filesystem */
+        g_print("Initializing new filesystem...\n");
+        BlueSkyInode *root = bluesky_new_inode(BLUESKY_ROOT_INUM, fs,
+                                               BLUESKY_DIRECTORY);
+        root->nlink = 1;
+        root->mode = 0755;
+        bluesky_insert_inode(fs, root);
+        bluesky_inode_update_ctime(root, TRUE);
+        bluesky_inode_do_sync(root);
+    }
 
     return fs;
 }
@@ -117,49 +129,79 @@ void bluesky_inode_ref(BlueSkyInode *inode)
     g_atomic_int_inc(&inode->refcount);
 }
 
-void bluesky_inode_unref(BlueSkyInode *inode)
+/* Free most of the resources used by an inode structure, but do not free the
+ * inode itself.  Can be used if the inode data will be reloaded from
+ * serialized form to clear out old information first. */
+void bluesky_inode_free_resources(BlueSkyInode *inode)
 {
-    if (g_atomic_int_dec_and_test(&inode->refcount)) {
-        g_print("Reference count for inode %"PRIu64" dropped to zero.\n",
-                inode->inum);
-
-        /* Sanity check: Is the inode clean? */
-        if (inode->change_commit < inode->change_count) {
-            g_warning("Dropping inode which is not clean (commit %"PRIi64" < change %"PRIi64")\n", inode->change_commit, inode->change_count);
-        }
-
-        /* Free file type specific data.  It should be an error for there to be
-         * dirty data to commit when the reference count has reaches zero. */
-        switch (inode->type) {
-        case BLUESKY_REGULAR:
+    switch (inode->type) {
+    case BLUESKY_REGULAR:
+        if (inode->blocks != NULL) {
             for (int i = 0; i < inode->blocks->len; i++) {
                 BlueSkyBlock *b = &g_array_index(inode->blocks,
                                                  BlueSkyBlock, i);
                 if (b->type == BLUESKY_BLOCK_DIRTY) {
                     g_error("Deleting an inode with dirty file data!");
                 }
-                g_free(b->ref);
-                bluesky_string_unref(b->data);
+                bluesky_cloudlog_unref(b->ref);
+                bluesky_string_unref(b->dirty);
             }
             g_array_unref(inode->blocks);
-            break;
+            inode->blocks = NULL;
+        }
+        break;
 
-        case BLUESKY_DIRECTORY:
+    case BLUESKY_DIRECTORY:
+        if (inode->dirhash != NULL)
             g_hash_table_destroy(inode->dirhash);
+        inode->dirhash = NULL;
+        if (inode->dirhash_folded != NULL)
             g_hash_table_destroy(inode->dirhash_folded);
+        inode->dirhash_folded = NULL;
+        if (inode->dirents != NULL)
             g_sequence_free(inode->dirents);
-            break;
+        inode->dirents = NULL;
+        break;
 
-        case BLUESKY_SYMLINK:
-            g_free(inode->symlink_contents);
-            break;
+    case BLUESKY_SYMLINK:
+        g_free(inode->symlink_contents);
+        inode->symlink_contents = NULL;
+        break;
+
+    default:
+        break;
+    }
+}
 
-        default:
-            break;
+void bluesky_inode_unref(BlueSkyInode *inode)
+{
+    if (g_atomic_int_dec_and_test(&inode->refcount)) {
+        if (bluesky_verbose) {
+            g_log("bluesky/inode", G_LOG_LEVEL_DEBUG,
+                  "Reference count for inode %"PRIu64" dropped to zero.",
+                  inode->inum);
         }
 
-        g_mutex_free(inode->lock);
+        /* Sanity check: Is the inode clean? */
+        if (inode->change_commit < inode->change_count
+                || inode->accessed_list != NULL
+                || inode->unlogged_list != NULL
+                || inode->dirty_list != NULL) {
+            g_warning("Dropping inode which is not clean (commit %"PRIi64" < change %"PRIi64"; accessed_list = %p; dirty_list = %p)\n", inode->change_commit, inode->change_count, inode->accessed_list, inode->dirty_list);
+        }
+
+        /* These shouldn't be needed, but in case the above warning fires and
+         * we delete the inode anyway, we ought to be sure the inode is not on
+         * any LRU list. */
+        g_mutex_lock(inode->fs->lock);
+        bluesky_list_unlink(&inode->fs->accessed_list, inode->accessed_list);
+        bluesky_list_unlink(&inode->fs->dirty_list, inode->dirty_list);
+        bluesky_list_unlink(&inode->fs->unlogged_list, inode->unlogged_list);
+        g_mutex_unlock(inode->fs->lock);
 
+        bluesky_inode_free_resources(inode);
+
+        g_mutex_free(inode->lock);
         g_free(inode);
     }
 }
@@ -173,8 +215,6 @@ uint64_t bluesky_fs_alloc_inode(BlueSkyFS *fs)
     inum = fs->next_inum;
     fs->next_inum++;
 
-    bluesky_superblock_flush(fs);
-
     return inum;
 }
 
@@ -253,83 +293,77 @@ void bluesky_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode)
     g_hash_table_insert(fs->inodes, &inode->inum, inode);
 }
 
-/* Deprecated: Synchronize an inode to stable storage. */
-void bluesky_inode_flush(BlueSkyFS *fs, BlueSkyInode *inode)
-{
-    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);
-
-    BlueSkyStoreAsync *async = bluesky_store_async_new(fs->store);
-    async->op = STORE_OP_PUT;
-    async->key = g_strdup(key);
-    async->data = data;
-    bluesky_store_async_submit(async);
-    bluesky_store_async_unref(async);
-}
-
 /* Start writeback of an inode and all associated data. */
-void bluesky_inode_start_sync(BlueSkyInode *inode, BlueSkyStoreAsync *barrier)
+void bluesky_inode_start_sync(BlueSkyInode *inode)
 {
-    BlueSkyFS *fs = inode->fs;
+    GList *log_items = NULL;
 
     if (inode->type == BLUESKY_REGULAR)
-        bluesky_file_flush(inode, barrier);
-
-    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);
-
-    BlueSkyStoreAsync *async = bluesky_store_async_new(fs->store);
-    async->op = STORE_OP_PUT;
-    async->key = g_strdup(key);
-    async->data = data;
-    bluesky_store_async_submit(async);
-    if (barrier != NULL)
-        bluesky_store_add_barrier(barrier, async);
-    bluesky_store_async_unref(async);
+        bluesky_file_flush(inode, &log_items);
+
+    BlueSkyCloudLog *cloudlog = bluesky_serialize_inode(inode);
+
+    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);
+
+    /* 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
  * should already be locked. */
 void bluesky_inode_do_sync(BlueSkyInode *inode)
 {
-    BlueSkyStoreAsync *barrier = bluesky_store_async_new(inode->fs->store);
-    barrier->op = STORE_OP_BARRIER;
-
-    g_log("bluesky/inode", G_LOG_LEVEL_DEBUG,
-          "Synchronous writeback for inode %"PRIu64"...", inode->inum);
-    bluesky_inode_start_sync(inode, barrier);
-    bluesky_store_async_submit(barrier);
-    bluesky_store_async_wait(barrier);
-    bluesky_store_async_unref(barrier);
-    g_log("bluesky/inode", G_LOG_LEVEL_DEBUG,
-          "Writeback for inode %"PRIu64" complete", inode->inum);
+    if (bluesky_verbose) {
+        g_log("bluesky/inode", G_LOG_LEVEL_DEBUG,
+            "Synchronous writeback for inode %"PRIu64"...", inode->inum);
+    }
+    bluesky_inode_start_sync(inode);
+    if (bluesky_verbose) {
+        g_log("bluesky/inode", G_LOG_LEVEL_DEBUG,
+              "Writeback for inode %"PRIu64" complete", inode->inum);
+    }
 }
 
-static void complete_inode_fetch(BlueSkyStoreAsync *async, BlueSkyInode *inode)
+static void complete_inode_fetch(BlueSkyInode *inode)
 {
-    g_print("Completing fetch of inode %"PRIu64"...\n", inode->inum);
+    BlueSkyCloudLog *item = inode->committed_item;
+    inode->committed_item = NULL;
+    g_print("Completing fetch of inode %"PRIu64"...", inode->inum);
 
-    if (async->result != 0
-        || !bluesky_deserialize_inode(inode, async->data->data))
-    {
-        g_print("    failed to load inode, cleaning up\n");
-        g_mutex_lock(inode->fs->lock);
-        g_hash_table_remove(inode->fs->inodes, &inode->inum);
-        g_mutex_unlock(inode->fs->lock);
-        bluesky_inode_unref(inode);
-    }
+    g_mutex_lock(item->lock);
+    bluesky_cloudlog_fetch(item);
+    if (!bluesky_deserialize_inode(inode, item))
+        g_print("Error deserializing inode %"PRIu64"\n", inode->inum);
+    g_mutex_unlock(item->lock);
 
     inode->access_time = bluesky_get_current_time();
+    g_mutex_lock(inode->fs->lock);
+    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);
 
     g_mutex_unlock(inode->lock);
+    bluesky_cloudlog_unref(item);
     bluesky_inode_unref(inode);
 }
 
@@ -340,41 +374,19 @@ static void complete_inode_fetch(BlueSkyStoreAsync *async, BlueSkyInode *inode)
  * fs lock must be held. */
 void bluesky_inode_fetch(BlueSkyFS *fs, uint64_t inum)
 {
-    char key[64];
-    sprintf(key, "inode-%016"PRIx64, inum);
+    InodeMapEntry *entry = bluesky_inode_map_lookup(fs->inode_map, inum, 0);
+    if (entry == NULL)
+        return;
 
     BlueSkyInode *inode = bluesky_new_inode(inum, fs, BLUESKY_PENDING);
+    inode->change_count = 0;
     bluesky_inode_ref(inode);       // Extra ref held by fetching process
     g_mutex_lock(inode->lock);
     bluesky_insert_inode(fs, inode);
+    inode->committed_item = entry->item;
+    bluesky_cloudlog_ref(entry->item);
 
-    BlueSkyStoreAsync *async = bluesky_store_async_new(fs->store);
-    async->op = STORE_OP_GET;
-    async->key = g_strdup(key);
-
-    bluesky_store_async_add_notifier(async, (GFunc)complete_inode_fetch, inode);
-    bluesky_store_async_submit(async);
-
-    if (bluesky_options.sync_inode_fetches) {
-        bluesky_store_async_wait(async);
-    }
-
-    bluesky_store_async_unref(async);
-}
-
-/* Synchronize filesystem superblock to stable storage. */
-void bluesky_superblock_flush(BlueSkyFS *fs)
-{
-    GString *buf = g_string_new("");
-    bluesky_serialize_superblock(buf, fs);
-    BlueSkyRCStr *data = bluesky_string_new_from_gstring(buf);
-
-    BlueSkyStoreAsync *async = bluesky_store_async_new(fs->store);
-    async->op = STORE_OP_PUT;
-    async->key = g_strdup("superblock");
-    async->data = data;
-    bluesky_store_async_submit(async);
-    bluesky_store_async_unref(async);
-
-    bluesky_store_sync(fs->store);
+    /* TODO: Thread pool or other better async method. */
+    g_thread_create((GThreadFunc)complete_inode_fetch,
+                    (gpointer)inode, FALSE, NULL);
 }