/* * 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/fs.h> #include <linux/quotaops.h> #include <linux/posix_acl_xattr.h> #include "jfs_incore.h" #include "jfs_txnmgr.h" #include "jfs_xattr.h" #include "jfs_acl.h" static struct posix_acl *jfs_get_acl(struct inode *inode, int type) { struct posix_acl *acl; char *ea_name; struct jfs_inode_info *ji = JFS_IP(inode); struct posix_acl **p_acl; int size; char *value = NULL; switch(type) { case ACL_TYPE_ACCESS: ea_name = POSIX_ACL_XATTR_ACCESS; p_acl = &ji->i_acl; break; case ACL_TYPE_DEFAULT: ea_name = POSIX_ACL_XATTR_DEFAULT; p_acl = &ji->i_default_acl; break; default: return ERR_PTR(-EINVAL); } if (*p_acl != JFS_ACL_NOT_CACHED) return posix_acl_dup(*p_acl); 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) { *p_acl = NULL; acl = NULL; } else acl = ERR_PTR(size); } else { acl = posix_acl_from_xattr(value, size); if (!IS_ERR(acl)) *p_acl = posix_acl_dup(acl); } kfree(value); return acl; } static int jfs_set_acl(tid_t tid, struct inode *inode, int type, struct posix_acl *acl) { char *ea_name; struct jfs_inode_info *ji = JFS_IP(inode); struct posix_acl **p_acl; int rc; int size = 0; char *value = NULL; if (S_ISLNK(inode->i_mode)) return -EOPNOTSUPP; switch(type) { case ACL_TYPE_ACCESS: ea_name = POSIX_ACL_XATTR_ACCESS; p_acl = &ji->i_acl; break; case ACL_TYPE_DEFAULT: ea_name = POSIX_ACL_XATTR_DEFAULT; p_acl = &ji->i_default_acl; if (!S_ISDIR(inode->i_mode)) return acl ? -EACCES : 0; 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(acl, value, size); if (rc < 0) goto out; } rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); out: kfree(value); if (!rc) { if (*p_acl && (*p_acl != JFS_ACL_NOT_CACHED)) posix_acl_release(*p_acl); *p_acl = posix_acl_dup(acl); } return rc; } static int jfs_check_acl(struct inode *inode, int mask) { struct jfs_inode_info *ji = JFS_IP(inode); if (ji->i_acl == JFS_ACL_NOT_CACHED) { struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(acl)) return PTR_ERR(acl); posix_acl_release(acl); } if (ji->i_acl) return posix_acl_permission(inode, ji->i_acl, mask); return -EAGAIN; } int jfs_permission(struct inode *inode, int mask, struct nameidata *nd) { return generic_permission(inode, mask, jfs_check_acl); } int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) { struct posix_acl *acl = NULL; struct posix_acl *clone; mode_t mode; int rc = 0; if (S_ISLNK(inode->i_mode)) return 0; acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT); if (IS_ERR(acl)) return PTR_ERR(acl); if (acl) { if (S_ISDIR(inode->i_mode)) { rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl); if (rc) goto cleanup; } clone = posix_acl_clone(acl, GFP_KERNEL); if (!clone) { rc = -ENOMEM; goto cleanup; } mode = inode->i_mode; rc = posix_acl_create_masq(clone, &mode); if (rc >= 0) { inode->i_mode = mode; if (rc > 0) rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone); } posix_acl_release(clone); cleanup: posix_acl_release(acl); } else inode->i_mode &= ~current->fs->umask; return rc; } static int jfs_acl_chmod(struct inode *inode) { struct posix_acl *acl, *clone; int rc; if (S_ISLNK(inode->i_mode)) return -EOPNOTSUPP; acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(acl) || !acl) return PTR_ERR(acl); clone = posix_acl_clone(acl, GFP_KERNEL); posix_acl_release(acl); if (!clone) return -ENOMEM; rc = posix_acl_chmod_masq(clone, inode->i_mode); if (!rc) { tid_t tid = txBegin(inode->i_sb, 0); down(&JFS_IP(inode)->commit_sem); rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone); if (!rc) rc = txCommit(tid, 1, &inode, 0); txEnd(tid); up(&JFS_IP(inode)->commit_sem); } posix_acl_release(clone); return rc; } int jfs_setattr(struct dentry *dentry, struct iattr *iattr) { struct inode *inode = dentry->d_inode; int rc; rc = inode_change_ok(inode, iattr); if (rc) return rc; if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) || (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) { if (DQUOT_TRANSFER(inode, iattr)) return -EDQUOT; } rc = inode_setattr(inode, iattr); if (!rc && (iattr->ia_valid & ATTR_MODE)) rc = jfs_acl_chmod(inode); return rc; }