From: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
Subject: [RFC][PATCH 12/15] nilfs2: implement "trusted.*" namespace support
This patch adds functionality of "trusted.*" namespace support.
Signed-off-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
CC: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
---
fs/nilfs2/xattr_trusted.c | 126 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 126 insertions(+)
create mode 100644 fs/nilfs2/xattr_trusted.c
diff --git a/fs/nilfs2/xattr_trusted.c b/fs/nilfs2/xattr_trusted.c
new file mode 100644
index 0000000..e1038b6
--- /dev/null
+++ b/fs/nilfs2/xattr_trusted.c
@@ -0,0 +1,126 @@
+/*
+ * xattr_trusted.c - Handler for trusted extended attributes.
+ *
+ * Copyright (C) 2005-2013 Nippon Telegraph and Telephone Corporation.
+ * Copyright (C) 2013 Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ *
+ * This program 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
+ *
+ * Written by Vyacheslav Dubeyko <slava@xxxxxxxxxxx>
+ */
+
+#include "nilfs.h"
+#include "xafile.h"
+#include "xattr.h"
+
+static size_t nilfs_trusted_listxattr(struct dentry *dentry,
+ char *list,
+ size_t list_size,
+ const char *name,
+ size_t name_len,
+ int type)
+{
+ struct the_nilfs *nilfs = dentry->d_inode->i_sb->s_fs_info;
+ const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
+ const size_t total_len = prefix_len + name_len + 1;
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return 0;
+
+ if (list && total_len <= list_size) {
+ memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
+ memcpy(list+prefix_len, name, name_len);
+ list[prefix_len + name_len] = '\0';
+ }
+ return total_len;
+}
+
+static int nilfs_trusted_getxattr(struct dentry *dentry,
+ const char *name,
+ void *buffer,
+ size_t size,
+ int type)
+{
+ struct the_nilfs *nilfs = dentry->d_inode->i_sb->s_fs_info;
+ size_t len;
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (name == NULL)
+ return -EINVAL;
+
+ if (strcmp(name, "") == 0)
+ return -EINVAL;
+
+ len = strlen(name);
+
+ if ((len + XATTR_TRUSTED_PREFIX_LEN) > XATTR_NAME_MAX)
+ return -EOPNOTSUPP;
+
+ return nilfs_getxattr(dentry, NILFS_TRUSTED_XATTR_ID, name,
+ buffer, size);
+}
+
+static int nilfs_trusted_setxattr(struct dentry *dentry,
+ const char *name,
+ const void *value,
+ size_t size,
+ int flags,
+ int type)
+{
+ struct the_nilfs *nilfs = dentry->d_inode->i_sb->s_fs_info;
+ size_t len;
+ struct nilfs_transaction_info ti;
+ int err;
+
+ if (!nilfs_has_xafile(nilfs))
+ return -EOPNOTSUPP;
+
+ if (name == NULL)
+ return -EINVAL;
+
+ if (strcmp(name, "") == 0)
+ return -EINVAL;
+
+ len = strlen(name);
+
+ if ((len + XATTR_TRUSTED_PREFIX_LEN) > XATTR_NAME_MAX)
+ return -EOPNOTSUPP;
+
+ err = nilfs_transaction_begin(dentry->d_inode->i_sb, &ti, 0);
+ if (unlikely(err))
+ return err;
+
+ err = nilfs_setxattr(dentry, NILFS_TRUSTED_XATTR_ID, name,
+ value, size, flags);
+
+ if (!err)
+ err = nilfs_transaction_commit(dentry->d_inode->i_sb);
+ else
+ nilfs_transaction_abort(dentry->d_inode->i_sb);
+
+ return err;
+}
+
+const struct xattr_handler nilfs_xattr_trusted_handler = {
+ .prefix = XATTR_TRUSTED_PREFIX,
+ .list = nilfs_trusted_listxattr,
+ .get = nilfs_trusted_getxattr,
+ .set = nilfs_trusted_setxattr,
+};
--
1.7.9.5
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