/* * Copyright (C) International Business Machines Corp., 2002-2004 * Copyright (C) Andreas Gruenbacher, 2001 * Copyright (C) Linus Torvalds, 1991, 1992 * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/sched.h> #include <linux/slab.h> #include <linux/fs.h> #include <linux/posix_acl_xattr.h> #include "jfs_incore.h" #include "jfs_txnmgr.h" #include "jfs_xattr.h" #include "jfs_acl.h" struct posix_acl *jfs_get_acl(struct inode *inode, int type) { struct posix_acl *acl; char *ea_name; int size; char *value = NULL; acl = get_cached_acl(inode, type); if (acl != ACL_NOT_CACHED) return acl; switch(type) { case ACL_TYPE_ACCESS: ea_name = XATTR_NAME_POSIX_ACL_ACCESS; break; case ACL_TYPE_DEFAULT: ea_name = XATTR_NAME_POSIX_ACL_DEFAULT; break; default: return ERR_PTR(-EINVAL); } size = __jfs_getxattr(inode, ea_name, NULL, 0); if (size > 0) { value = kmalloc(size, GFP_KERNEL); if (!value) return ERR_PTR(-ENOMEM); size = __jfs_getxattr(inode, ea_name, value, size); } if (size < 0) { if (size == -ENODATA) acl = NULL; else acl = ERR_PTR(size); } else { acl = posix_acl_from_xattr(&init_user_ns, value, size); } kfree(value); if (!IS_ERR(acl)) set_cached_acl(inode, type, acl); return acl; } static int __jfs_set_acl(tid_t tid, struct inode *inode, int type, struct posix_acl *acl) { char *ea_name; int rc; int size = 0; char *value = NULL; switch (type) { case ACL_TYPE_ACCESS: ea_name = XATTR_NAME_POSIX_ACL_ACCESS; if (acl) { rc = posix_acl_equiv_mode(acl, &inode->i_mode); if (rc < 0) return rc; inode->i_ctime = CURRENT_TIME; mark_inode_dirty(inode); if (rc == 0) acl = NULL; } break; case ACL_TYPE_DEFAULT: ea_name = XATTR_NAME_POSIX_ACL_DEFAULT; break; default: return -EINVAL; } if (acl) { size = posix_acl_xattr_size(acl->a_count); value = kmalloc(size, GFP_KERNEL); if (!value) return -ENOMEM; rc = posix_acl_to_xattr(&init_user_ns, acl, value, size); if (rc < 0) goto out; } rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); out: kfree(value); if (!rc) set_cached_acl(inode, type, acl); return rc; } int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type) { int rc; tid_t tid; tid = txBegin(inode->i_sb, 0); mutex_lock(&JFS_IP(inode)->commit_mutex); rc = __jfs_set_acl(tid, inode, type, acl); if (!rc) rc = txCommit(tid, 1, &inode, 0); txEnd(tid); mutex_unlock(&JFS_IP(inode)->commit_mutex); return rc; } int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) { struct posix_acl *default_acl, *acl; int rc = 0; rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); if (rc) return rc; if (default_acl) { rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl); posix_acl_release(default_acl); } if (acl) { if (!rc) rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl); posix_acl_release(acl); } JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | inode->i_mode; return rc; }