VTreeFS library

lib/libvtreefs/link.c

@@ -0,0 +1,41 @@
+/* VTreeFS - link.c - by Alen Stojanov and David van Moolenbroek */
+
+#include "inc.h"
+
+/*===========================================================================*
+ *				fs_rdlink				     *
+ *===========================================================================*/
+PUBLIC int fs_rdlink(void)
+{
+	/* Retrieve symbolic link target.
+	 */
+	char path[PATH_MAX];
+	struct inode *node;
+	size_t len;
+	int r;
+
+	if ((node = find_inode(fs_m_in.REQ_INODE_NR)) == NULL)
+		return EINVAL;
+
+	/* Call the rdlink hook. */
+	assert(vtreefs_hooks->rdlink_hook != NULL);
+	assert(!is_inode_deleted(node));	/* symlinks cannot be opened */
+
+	r = vtreefs_hooks->rdlink_hook(node, path, sizeof(path),
+		get_inode_cbdata(node));
+	if (r != OK) return r;
+
+	len = strlen(path);
+	assert(len > 0 && len < sizeof(path));
+
+	if (len > fs_m_in.REQ_MEM_SIZE)
+		len = fs_m_in.REQ_MEM_SIZE;
+
+	/* Copy out the result. */
+	r = sys_safecopyto(fs_m_in.m_source, fs_m_in.REQ_GRANT, 0,
+		(vir_bytes) path, len, D);
+	if (r != OK) return r;
+
+	fs_m_out.RES_NBYTES = len;
+	return OK;
+}