From: Michael Vrable <mvrable@cs.ucsd.edu>
Date: Fri, 13 Nov 2009 23:12:45 +0000 (-0800)
Subject: New BlueSky interface for implementing readdir.
X-Git-Url: https://git.vrable.net/?a=commitdiff_plain;h=bc90f29d0c20f85e77761dbf2c43aec96848af36;p=bluesky.git

New BlueSky interface for implementing readdir.
---

diff --git a/bluesky/bluesky.h b/bluesky/bluesky.h
index fc30075..9808434 100644
--- a/bluesky/bluesky.h
+++ b/bluesky/bluesky.h
@@ -210,6 +210,7 @@ void bluesky_insert_inode(BlueSkyFS *fs, BlueSkyInode *inode);
 void bluesky_dirent_destroy(gpointer dirent);
 uint64_t bluesky_directory_lookup(BlueSkyInode *inode, gchar *name);
 uint64_t bluesky_directory_ilookup(BlueSkyInode *inode, gchar *name);
+BlueSkyDirent *bluesky_directory_read(BlueSkyInode *dir, uint32_t cookie);
 gboolean bluesky_directory_insert(BlueSkyInode *dir, const gchar *name,
                                   uint64_t inum);
 void bluesky_directory_dump(BlueSkyInode *dir);
diff --git a/bluesky/dir.c b/bluesky/dir.c
index 44729b4..f279eb6 100644
--- a/bluesky/dir.c
+++ b/bluesky/dir.c
@@ -67,6 +67,22 @@ uint64_t bluesky_directory_ilookup(BlueSkyInode *inode, gchar *name)
         return d->inum;
 }
 
+/* Iterate through a directory listing.  This returns one directory entry at a
+ * time, finding the first entry with a directory cookie value larger than the
+ * supplied one.  Use a cookie of 0 to start reading from the start of a
+ * directory. */
+BlueSkyDirent *bluesky_directory_read(BlueSkyInode *dir, uint32_t cookie)
+{
+    BlueSkyDirent start = {NULL, NULL, cookie, 0};
+    GSequenceIter *i = g_sequence_search(dir->dirents, &start,
+                                         bluesky_dirent_compare, NULL);
+
+    if (g_sequence_iter_is_end(i))
+        return NULL;
+    else
+        return g_sequence_get(i);
+}
+
 /* Insert a new entry into a directory.  Should be called with the inode lock
  * already held. */
 gboolean bluesky_directory_insert(BlueSkyInode *dir,