Directory deserialization and loading of inodes from stable store.

[bluesky.git] / bluesky / inode.c

diff --git a/bluesky/inode.c b/bluesky/inode.c
index d8b80cf..3430b19 100644 (file)
--- a/bluesky/inode.c
+++ b/bluesky/inode.c
@@ -6,6 +6,7 @@
  * TODO: Licensing
  */
 
+#include <stdio.h>
 #include <stdint.h>
 #include <glib.h>
 #include <string.h>
@@ -37,54 +38,6 @@ void bluesky_inode_update_ctime(BlueSkyInode *inode, gboolean update_mtime)
         inode->mtime = now;
 }
 
-/* Compute the HMAC keyed-hash function using the given hash algorithm, data,
- * and key. */
-void compute_hmac(GChecksumType algo,
-                  const guchar *data, gsize data_len,
-                  const guchar *key, gsize key_len,
-                  guint8 *buffer, gsize *digest_len)
-{
-    int block_size;
-
-    switch (algo) {
-    case G_CHECKSUM_MD5:
-    case G_CHECKSUM_SHA1:
-    case G_CHECKSUM_SHA256:
-        block_size = 64;
-        break;
-    default:
-        g_error("Unknown hash algorithm for HMAC: %d\n", algo);
-    }
-
-    gsize digest_size = g_checksum_type_get_length(algo);
-
-    guchar keybuf[block_size];
-    memset(keybuf, 0, block_size);
-    memcpy(keybuf, key, MIN(block_size, key_len));
-    for (int i = 0; i < block_size; i++)
-        keybuf[i] ^= 0x36;
-
-    GChecksum *csum1 = g_checksum_new(algo);
-    g_checksum_update(csum1, keybuf, block_size);
-    g_checksum_update(csum1, data, data_len);
-    guint8 digest[digest_size];
-    g_checksum_get_digest(csum1, digest, &digest_size);
-
-    memset(keybuf, 0, block_size);
-    memcpy(keybuf, key, MIN(block_size, key_len));
-    for (int i = 0; i < block_size; i++)
-        keybuf[i] ^= 0x5c;
-
-    GChecksum *csum2 = g_checksum_new(algo);
-    g_checksum_update(csum2, keybuf, block_size);
-    g_checksum_update(csum2, digest, digest_size);
-
-    g_checksum_get_digest(csum2, buffer, digest_len);
-
-    g_checksum_free(csum1);
-    g_checksum_free(csum2);
-}
-
 /* Unfortunately a glib hash table is only guaranteed to be able to store
  * 32-bit keys if we use the key directly.  If we want 64-bit inode numbers,
  * we'll have to allocate memory to store the 64-bit inumber, and use a pointer
@@ -188,6 +141,13 @@ BlueSkyInode *bluesky_get_inode(BlueSkyFS *fs, uint64_t inum)
     inode = (BlueSkyInode *)g_hash_table_lookup(fs->inodes, &inum);
     g_mutex_unlock(fs->lock);
 
+    if (inode == NULL) {
+        bluesky_inode_fetch(fs, inum);
+        g_mutex_lock(fs->lock);
+        inode = (BlueSkyInode *)g_hash_table_lookup(fs->inodes, &inum);
+        g_mutex_unlock(fs->lock);
+    }
+
     return inode;
 }
 
@@ -198,3 +158,32 @@ void bluesky_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode)
     g_hash_table_insert(fs->inodes, &inode->inum, inode);
     g_mutex_unlock(fs->lock);
 }
+
+/* Synchronize an inode to stable storage. */
+void bluesky_inode_flush(BlueSkyFS *fs, BlueSkyInode *inode)
+{
+    GString *buf = g_string_new("");
+    bluesky_serialize_inode(buf, inode);
+
+    gsize len = buf->len;
+    BlueSkyRCStr *data = bluesky_string_new(g_string_free(buf, FALSE), len);
+
+    char key[64];
+    sprintf(key, "inode-%016llx", inode->inum);
+
+    bluesky_store_put(fs->store, key, data);
+}
+
+/* Fetch an inode from stable storage. */
+void bluesky_inode_fetch(BlueSkyFS *fs, uint64_t inum)
+{
+    char key[64];
+    sprintf(key, "inode-%016llx", inum);
+    BlueSkyRCStr *data = bluesky_store_get(fs->store, key);
+
+    BlueSkyInode *inode = bluesky_deserialize_inode(fs, data->data);
+    if (inode != NULL) {
+        bluesky_insert_inode(fs, inode);
+        g_print("Loaded inode %lld\n", (long long)inum);
+    }
+}