/* * linux/fs/ext2/xattr_user.c * Handler for extended user attributes. * * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org> */ #include <linux/init.h> #include <linux/module.h> #include <linux/string.h> #include "ext2.h" #include "xattr.h" #define XATTR_USER_PREFIX "user." static size_t ext2_xattr_user_list(struct inode *inode, char *list, size_t list_size, const char *name, size_t name_len) { const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1; const size_t total_len = prefix_len + name_len + 1; if (!test_opt(inode->i_sb, XATTR_USER)) return 0; 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 ext2_xattr_user_get(struct inode *inode, const char *name, void *buffer, size_t size) { int error; if (strcmp(name, "") == 0) return -EINVAL; if (!test_opt(inode->i_sb, XATTR_USER)) return -EOPNOTSUPP; error = permission(inode, MAY_READ, NULL); if (error) return error; return ext2_xattr_get(inode, EXT2_XATTR_INDEX_USER, name, buffer, size); } static int ext2_xattr_user_set(struct inode *inode, const char *name, const void *value, size_t size, int flags) { int error; if (strcmp(name, "") == 0) return -EINVAL; if (!test_opt(inode->i_sb, XATTR_USER)) return -EOPNOTSUPP; if ( !S_ISREG(inode->i_mode) && (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX)) return -EPERM; error = permission(inode, MAY_WRITE, NULL); if (error) return error; return ext2_xattr_set(inode, EXT2_XATTR_INDEX_USER, name, value, size, flags); } struct xattr_handler ext2_xattr_user_handler = { .prefix = XATTR_USER_PREFIX, .list = ext2_xattr_user_list, .get = ext2_xattr_user_get, .set = ext2_xattr_user_set, };