/* *  linux/fs/ufs/acl.c * * Copyright (C) 1998 * Daniel Pirkl <daniel.pirkl@email.cz> * Charles University, Faculty of Mathematics and Physics * *  from * *  linux/fs/ext2/acl.c * * Copyright (C) 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) *//* * This file will contain the Access Control Lists management for UFS */#include <linux/errno.h>#include <linux/fs.h>#include <linux/ufs_fs.h>#include <linux/sched.h>#include <linux/stat.h>/* * ufs_permission () * * Check for access rights */int ufs_permission (struct inode * inode, int mask){	unsigned short mode = inode->i_mode;	/*	 * Nobody gets write access to a file on a readonly-fs	 */	if ((mask & S_IWOTH) && 	    (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) &&	    IS_RDONLY(inode))		return -EROFS;	/*	 * Nobody gets write access to an immutable file	 */	if ((mask & S_IWOTH) && IS_IMMUTABLE(inode))		return -EACCES;	/*	 * If no ACL, checks using the file mode	 */	else if (current->fsuid == inode->i_uid)		mode >>= 6;	else if (in_group_p (inode->i_gid))		mode >>= 3;	/*	 * Access is always granted for root. We now check last,	 * though, for BSD process accounting correctness	 */	if (((mode & mask & S_IRWXO) == mask) || capable(CAP_DAC_OVERRIDE))		return 0;	if ((mask == S_IROTH) ||	    (S_ISDIR(mode)  && !(mask & ~(S_IROTH | S_IXOTH))))		if (capable(CAP_DAC_READ_SEARCH))			return 0;	return -EACCES;}