[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/jffs2/symlink.c b/ap/os/linux/linux-3.4.x/fs/jffs2/symlink.c
new file mode 100644
index 0000000..6e56333
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/jffs2/symlink.c
@@ -0,0 +1,67 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2001-2007 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include "nodelist.h"
+
+static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd);
+
+const struct inode_operations jffs2_symlink_inode_operations =
+{
+ .readlink = generic_readlink,
+ .follow_link = jffs2_follow_link,
+ .get_acl = jffs2_get_acl,
+ .setattr = jffs2_setattr,
+ .setxattr = jffs2_setxattr,
+ .getxattr = jffs2_getxattr,
+ .listxattr = jffs2_listxattr,
+ .removexattr = jffs2_removexattr
+};
+
+static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
+ char *p = (char *)f->target;
+
+ /*
+ * We don't acquire the f->sem mutex here since the only data we
+ * use is f->target.
+ *
+ * 1. If we are here the inode has already built and f->target has
+ * to point to the target path.
+ * 2. Nobody uses f->target (if the inode is symlink's inode). The
+ * exception is inode freeing function which frees f->target. But
+ * it can't be called while we are here and before VFS has
+ * stopped using our f->target string which we provide by means of
+ * nd_set_link() call.
+ */
+
+ if (!p) {
+ pr_err("%s(): can't find symlink target\n", __func__);
+ p = ERR_PTR(-EIO);
+ }
+ jffs2_dbg(1, "%s(): target path is '%s'\n",
+ __func__, (char *)f->target);
+
+ nd_set_link(nd, p);
+
+ /*
+ * We will unlock the f->sem mutex but VFS will use the f->target string. This is safe
+ * since the only way that may cause f->target to be changed is iput() operation.
+ * But VFS will not use f->target after iput() has been called.
+ */
+ return NULL;
+}
+