From: Vyacheslav Dubeyko <[email protected]> Subject: [RFC][STEP 1][PATCH v2 12/17] nilfs2: implement "trusted.*" namespace support
This patch adds functionality of "trusted.*" namespace support. Signed-off-by: Vyacheslav Dubeyko <[email protected]> CC: Ryusuke Konishi <[email protected]> --- 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 <[email protected]> + * + * 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 <[email protected]> + */ + +#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 -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
