From: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
initial commit
aufs lookup functions in 'delegate' mode
Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
---
fs/aufs/dlgt.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 113 insertions(+), 0 deletions(-)
diff --git a/fs/aufs/dlgt.c b/fs/aufs/dlgt.c
new file mode 100644
index 0000000..0721a73
--- /dev/null
+++ b/fs/aufs/dlgt.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2008 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * lookup functions in 'delegate' mode
+ *
+ * $Id: dlgt.c,v 1.2 2008/04/21 02:00:37 sfjro Exp $
+ */
+
+//#include <linux/security.h>
+#include "aufs.h"
+
+/* ---------------------------------------------------------------------- */
+
+struct au_lookup_one_len_args {
+ struct dentry **errp;
+ const char *name;
+ struct dentry *parent;
+ int len;
+};
+
+static void au_call_lookup_one_len(void *args)
+{
+ struct au_lookup_one_len_args *a = args;
+ *a->errp = vfsub_lookup_one_len(a->name, a->parent, a->len);
+}
+
+struct dentry *au_lkup_one_dlgt(const char *name, struct dentry *parent,
+ int len, unsigned int flags)
+{
+ struct dentry *dentry;
+ int dirperm1;
+
+ LKTRTrace("%.*s/%.*s, 0x%x\n", AuDLNPair(parent), len, name, flags);
+
+ dirperm1 = au_ftest_ndx(flags, DIRPERM1);
+ if (!dirperm1 && !au_ftest_ndx(flags, DLGT))
+ dentry = vfsub_lookup_one_len(name, parent, len);
+ else {
+ int wkq_err;
+ struct au_lookup_one_len_args args = {
+ .errp = &dentry,
+ .name = name,
+ .parent = parent,
+ .len = len
+ };
+ wkq_err = au_wkq_wait(au_call_lookup_one_len, &args,
+ /*dlgt*/!dirperm1);
+ if (unlikely(wkq_err))
+ dentry = ERR_PTR(wkq_err);
+ }
+
+ AuTraceErrPtr(dentry);
+ return dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct security_inode_permission_args {
+ int *errp;
+ struct inode *h_inode;
+ int mask;
+ struct nameidata *fake_nd;
+};
+
+static void call_security_inode_permission(void *args)
+{
+ struct security_inode_permission_args *a = args;
+ LKTRTrace("fsuid %d\n", current->fsuid);
+ *a->errp = security_inode_permission(a->h_inode, a->mask, a->fake_nd);
+}
+
+int au_security_inode_permission(struct inode *h_inode, int mask,
+ struct nameidata *fake_nd, int dlgt)
+{
+ int err;
+
+ AuTraceEnter();
+
+ if (!dlgt)
+ err = security_inode_permission(h_inode, mask, fake_nd);
+ else {
+ int wkq_err;
+ struct security_inode_permission_args args = {
+ .errp = &err,
+ .h_inode = h_inode,
+ .mask = mask,
+ .fake_nd = fake_nd
+ };
+ wkq_err = au_wkq_wait(call_security_inode_permission, &args,
+ /*dlgt*/1);
+ if (unlikely(wkq_err))
+ err = wkq_err;
+ }
+
+ AuTraceErr(err);
+ return err;
+}
--
1.4.4.4
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