X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=inode.c;h=7ea8dbf2af026b0e74f4235003f040b6bac303c8;hb=d32328c00f54c2f6f4e6eeb8993d33d062e9477c;hp=b1071a63cbd6b5b4222916ad2babf27bb67b2fc4;hpb=3ebe1efb5570c4a678774ebdf33b36be6dc49bbc;p=bluesky.git

diff --git a/inode.c b/inode.c
index b1071a6..7ea8dbf 100644
--- a/inode.c
+++ b/inode.c
@@ -193,14 +193,16 @@ void bluesky_block_touch(BlueSkyInode *inode, uint64_t i)
 
     switch (block->type) {
     case BLUESKY_BLOCK_ZERO:
-        block->data = g_malloc0(BLUESKY_BLOCK_SIZE);
+        block->data = bluesky_string_new(g_malloc0(BLUESKY_BLOCK_SIZE),
+                                         BLUESKY_BLOCK_SIZE);
         break;
     case BLUESKY_BLOCK_REF:
-        /* TODO: Pull in data first */
-        block->data = g_malloc0(BLUESKY_BLOCK_SIZE);
-        break;
+        bluesky_block_fetch(inode->fs, block);
+        g_assert(block->type == BLUESKY_BLOCK_CACHED);
+        /* Fall through */
     case BLUESKY_BLOCK_CACHED:
     case BLUESKY_BLOCK_DIRTY:
+        block->data = bluesky_string_dup(block->data);
         break;
     }
 
@@ -228,7 +230,7 @@ void bluesky_file_truncate(BlueSkyInode *inode, uint64_t size)
         for (guint i = inode->blocks->len; i < blocks; i++) {
             BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock, i);
             g_free(b->ref);
-            g_free(b->data);
+            bluesky_string_unref(b->data);
         }
         g_array_set_size(inode->blocks, blocks);
     }
@@ -242,7 +244,7 @@ void bluesky_file_truncate(BlueSkyInode *inode, uint64_t size)
             bluesky_block_touch(inode, blocks - 1);
             int end_offset = size % BLUESKY_BLOCK_SIZE;
             if (end_offset > 0) {
-                memset(&b->data[end_offset], 0,
+                memset(&b->data->data[end_offset], 0,
                        BLUESKY_BLOCK_SIZE - end_offset);
             }
         }
@@ -270,7 +272,7 @@ void bluesky_file_write(BlueSkyInode *inode, uint64_t offset,
         bluesky_block_touch(inode, block_num);
         BlueSkyBlock *b = &g_array_index(inode->blocks, BlueSkyBlock,
                                          block_num);
-        memcpy(&b->data[block_offset], data, bytes);
+        memcpy(&b->data->data[block_offset], data, bytes);
         bluesky_block_flush(inode->fs, b);
 
         offset += bytes;
@@ -300,12 +302,11 @@ void bluesky_file_read(BlueSkyInode *inode, uint64_t offset,
             memset(buf, 0, bytes);
             break;
         case BLUESKY_BLOCK_REF:
-            /* TODO: Pull in data first */
-            memset(buf, 0, bytes);
-            break;
+            bluesky_block_fetch(inode->fs, b);
+            /* Fall through */
         case BLUESKY_BLOCK_CACHED:
         case BLUESKY_BLOCK_DIRTY:
-            memcpy(buf, &b->data[block_offset], bytes);
+            memcpy(buf, &b->data->data[block_offset], bytes);
             break;
         }
 
@@ -315,26 +316,40 @@ void bluesky_file_read(BlueSkyInode *inode, uint64_t offset,
     }
 }
 
+/* Read the given block from cloud-backed storage if the data is not already
+ * cached. */
+void bluesky_block_fetch(BlueSkyFS *fs, BlueSkyBlock *block)
+{
+    if (block->type != BLUESKY_BLOCK_REF)
+        return;
+
+    g_print("Fetching block from %s\n", block->ref);
+    BlueSkyRCStr *string = s3store_get(fs->store, block->ref);
+
+    bluesky_string_unref(block->data);
+    block->data = string;
+    block->type = BLUESKY_BLOCK_CACHED;
+}
+
 /* Write the given block to cloud-backed storage and mark it clean. */
 void bluesky_block_flush(BlueSkyFS *fs, BlueSkyBlock *block)
 {
     if (block->type != BLUESKY_BLOCK_DIRTY)
         return;
 
-    BlueSkyRCStr *data = bluesky_string_new(g_memdup(block->data,
-                                                     BLUESKY_BLOCK_SIZE),
-                                            BLUESKY_BLOCK_SIZE);
-
     GChecksum *csum = g_checksum_new(G_CHECKSUM_SHA256);
-    g_checksum_update(csum, data->data, data->len);
-    const gchar *name = g_checksum_get_string(csum);
+    g_checksum_update(csum, block->data->data, block->data->len);
+    gchar *name = g_strdup(g_checksum_get_string(csum));
 
     g_print("Flushing block as %s\n", name);
-    s3store_put(fs->store, name, data);
+    s3store_put(fs->store, name, block->data);
     g_free(block->ref);
-    block->ref = g_strdup(name);
-    block->type = BLUESKY_BLOCK_CACHED;
+    block->ref = name;
+
+    /* block->type = BLUESKY_BLOCK_CACHED; */
+    bluesky_string_unref(block->data);
+    block->data = NULL;
+    block->type = BLUESKY_BLOCK_REF;
 
     g_checksum_free(csum);
-    bluesky_string_unref(data);
 }