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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/fs/jffs2/symlink.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/fs/jffs2/symlink.c')
-rw-r--r--kernel/fs/jffs2/symlink.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/kernel/fs/jffs2/symlink.c b/kernel/fs/jffs2/symlink.c
new file mode 100644
index 000000000..1fefa25d0
--- /dev/null
+++ b/kernel/fs/jffs2/symlink.c
@@ -0,0 +1,66 @@
+/*
+ * 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,
+ .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(d_inode(dentry));
+ 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;
+}
+