From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vyacheslav Dubeyko Subject: [RFC][PATCH 11/15] nilfs2: implement "user.*" namespace support Date: Wed, 27 Nov 2013 16:43:08 +0400 Message-ID: <1385556188.2589.77.camel@slavad-ubuntu> Reply-To: slava@dubeyko.com Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Linux FS Devel , linux-nilfs@vger.kernel.org To: Ryusuke Konishi Return-path: Received: from alt-proxy1.mail.unifiedlayer.com ([70.40.203.67]:54954 "HELO alt-proxy1.mail.unifiedlayer.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with SMTP id S1758030Ab3K1Bl6 (ORCPT ); Wed, 27 Nov 2013 20:41:58 -0500 Sender: linux-fsdevel-owner@vger.kernel.org List-ID: From: Vyacheslav Dubeyko Subject: [RFC][PATCH 11/15] nilfs2: implement "user.*" namespace support This patch adds functionality of "user.*" namespace support. Signed-off-by: Vyacheslav Dubeyko CC: Ryusuke Konishi --- fs/nilfs2/xattr_user.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 123 insertions(+) create mode 100644 fs/nilfs2/xattr_user.c diff --git a/fs/nilfs2/xattr_user.c b/fs/nilfs2/xattr_user.c new file mode 100644 index 0000000..b1841db --- /dev/null +++ b/fs/nilfs2/xattr_user.c @@ -0,0 +1,123 @@ +/* + * xattr_user.c - Handler for extended user attributes. + * + * Copyright (C) 2005-2013 Nippon Telegraph and Telephone Corporation. + * Copyright (C) 2013 Vyacheslav Dubeyko + * + * 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 + */ + +#include "nilfs.h" +#include "xafile.h" +#include "xattr.h" + +static size_t nilfs_user_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_USER_PREFIX_LEN; + const size_t total_len = prefix_len + name_len + 1; + + if (!nilfs_has_xafile(nilfs)) + return -EOPNOTSUPP; + + if (list && total_len <= list_size) { + memcpy(list, XATTR_USER_PREFIX, prefix_len); + memcpy(list+prefix_len, name, name_len); + list[prefix_len + name_len] = '\0'; + } + return total_len; +} + +static int nilfs_user_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_USER_PREFIX_LEN) > XATTR_NAME_MAX) + return -EOPNOTSUPP; + + return nilfs_getxattr(dentry, NILFS_USER_XATTR_ID, name, + buffer, size); +} + +static int nilfs_user_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_USER_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_USER_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_user_handler = { + .prefix = XATTR_USER_PREFIX, + .list = nilfs_user_listxattr, + .get = nilfs_user_getxattr, + .set = nilfs_user_setxattr, +}; -- 1.7.9.5