X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=inode.c;h=b9da798ca7ac773c1fad7b8bd1dc1469090d1803;hb=8819789ef2264b26aebfae489932a447f6e0f65f;hp=ec90757065baae963840ac27b1ad0588a9332d3f;hpb=a6d16121ebce069728e454b9bd4c5716d59c8809;p=bluesky.git

diff --git a/inode.c b/inode.c
index ec90757..b9da798 100644
--- a/inode.c
+++ b/inode.c
@@ -24,6 +24,39 @@ int64_t bluesky_get_current_time()
     return t.tv_sec * 1000000 + t.tv_usec;
 }
 
+/* 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
+ * to it.  Rather than allocate the memory for the key, we'll just include a
+ * pointer to the 64-bit inum stored in the inode itself, so that we don't need
+ * to do any more memory management.  */
+static guint bluesky_fs_key_hash_func(gconstpointer key)
+{
+    uint64_t inum = *(const uint64_t *)key;
+    return (guint)inum;
+}
+
+static gboolean bluesky_fs_key_equal_func(gconstpointer a, gconstpointer b)
+{
+    uint64_t i1 = *(const uint64_t *)a;
+    uint64_t i2 = *(const uint64_t *)b;
+    return i1 == i2;
+}
+
+/* Filesystem-level operations.  A filesystem is like a directory tree that we
+ * are willing to export. */
+BlueSkyFS *bluesky_new_fs(gchar *name)
+{
+    BlueSkyFS *fs = g_new0(BlueSkyFS, 1);
+    fs->lock = g_mutex_new();
+    fs->name = g_strdup(name);
+    fs->inodes = g_hash_table_new(bluesky_fs_key_hash_func,
+                                  bluesky_fs_key_equal_func);
+    fs->next_inum = BLUESKY_ROOT_INUM + 1;
+
+    return fs;
+}
+
 /* Allocate a fresh inode number which has not been used before within a
  * filesystem. */
 uint64_t bluesky_fs_alloc_inode(BlueSkyFS *fs)
@@ -38,12 +71,48 @@ uint64_t bluesky_fs_alloc_inode(BlueSkyFS *fs)
     return inum;
 }
 
-BlueSkyInode *bluesky_new_inode(uint64_t inum)
+BlueSkyInode *bluesky_new_inode(uint64_t inum, BlueSkyFileType type)
 {
     BlueSkyInode *i = g_new0(BlueSkyInode, 1);
 
     i->lock = g_mutex_new();
+    i->type = type;
     i->inum = inum;
 
+    switch (type) {
+    case BLUESKY_REGULAR:
+        break;
+    case BLUESKY_DIRECTORY:
+        i->dirents = g_sequence_new(bluesky_dirent_destroy);
+    case BLUESKY_BLOCK:
+    case BLUESKY_CHARACTER:
+    case BLUESKY_SYMLINK:
+    case BLUESKY_SOCKET:
+    case BLUESKY_FIFO:
+        break;
+    }
+
     return i;
 }
+
+/* Retrieve an inode from the filesystem.  Eventually this will be a cache and
+ * so we might need to go fetch the inode from elsewhere; for now all
+ * filesystem state is stored here. */
+BlueSkyInode *bluesky_get_inode(BlueSkyFS *fs, uint64_t inum)
+{
+    BlueSkyInode *inode = NULL;
+
+    g_mutex_lock(fs->lock);
+    inode = (BlueSkyInode *)g_hash_table_lookup(fs->inodes, &inum);
+    g_mutex_unlock(fs->lock);
+
+    return inode;
+}
+
+/* Insert an inode into the filesystem inode cache. */
+void bluesky_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode)
+{
+    g_mutex_lock(fs->lock);
+    g_hash_table_insert(fs->inodes, &inode->inum, inode);
+    g_mutex_unlock(fs->lock);
+}