1 /* 2 * Copyright (C) International Business Machines Corp., 2002-2004 3 * Copyright (C) Andreas Gruenbacher, 2001 4 * Copyright (C) Linus Torvalds, 1991, 1992 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 14 * the GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21 #include <linux/sched.h> 22 #include <linux/slab.h> 23 #include <linux/fs.h> 24 #include <linux/posix_acl_xattr.h> 25 #include "jfs_incore.h" 26 #include "jfs_txnmgr.h" 27 #include "jfs_xattr.h" 28 #include "jfs_acl.h" 29 30 struct posix_acl *jfs_get_acl(struct inode *inode, int type) 31 { 32 struct posix_acl *acl; 33 char *ea_name; 34 int size; 35 char *value = NULL; 36 37 switch(type) { 38 case ACL_TYPE_ACCESS: 39 ea_name = XATTR_NAME_POSIX_ACL_ACCESS; 40 break; 41 case ACL_TYPE_DEFAULT: 42 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT; 43 break; 44 default: 45 return ERR_PTR(-EINVAL); 46 } 47 48 size = __jfs_getxattr(inode, ea_name, NULL, 0); 49 50 if (size > 0) { 51 value = kmalloc(size, GFP_KERNEL); 52 if (!value) 53 return ERR_PTR(-ENOMEM); 54 size = __jfs_getxattr(inode, ea_name, value, size); 55 } 56 57 if (size < 0) { 58 if (size == -ENODATA) 59 acl = NULL; 60 else 61 acl = ERR_PTR(size); 62 } else { 63 acl = posix_acl_from_xattr(&init_user_ns, value, size); 64 } 65 kfree(value); 66 return acl; 67 } 68 69 static int __jfs_set_acl(tid_t tid, struct inode *inode, int type, 70 struct posix_acl *acl) 71 { 72 char *ea_name; 73 int rc; 74 int size = 0; 75 char *value = NULL; 76 77 switch (type) { 78 case ACL_TYPE_ACCESS: 79 ea_name = XATTR_NAME_POSIX_ACL_ACCESS; 80 if (acl) { 81 rc = posix_acl_equiv_mode(acl, &inode->i_mode); 82 if (rc < 0) 83 return rc; 84 inode->i_ctime = CURRENT_TIME; 85 mark_inode_dirty(inode); 86 if (rc == 0) 87 acl = NULL; 88 } 89 break; 90 case ACL_TYPE_DEFAULT: 91 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT; 92 break; 93 default: 94 return -EINVAL; 95 } 96 97 if (acl) { 98 size = posix_acl_xattr_size(acl->a_count); 99 value = kmalloc(size, GFP_KERNEL); 100 if (!value) 101 return -ENOMEM; 102 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size); 103 if (rc < 0) 104 goto out; 105 } 106 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); 107 out: 108 kfree(value); 109 110 if (!rc) 111 set_cached_acl(inode, type, acl); 112 113 return rc; 114 } 115 116 int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type) 117 { 118 int rc; 119 tid_t tid; 120 121 tid = txBegin(inode->i_sb, 0); 122 mutex_lock(&JFS_IP(inode)->commit_mutex); 123 rc = __jfs_set_acl(tid, inode, type, acl); 124 if (!rc) 125 rc = txCommit(tid, 1, &inode, 0); 126 txEnd(tid); 127 mutex_unlock(&JFS_IP(inode)->commit_mutex); 128 return rc; 129 } 130 131 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) 132 { 133 struct posix_acl *default_acl, *acl; 134 int rc = 0; 135 136 rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 137 if (rc) 138 return rc; 139 140 if (default_acl) { 141 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl); 142 posix_acl_release(default_acl); 143 } 144 145 if (acl) { 146 if (!rc) 147 rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl); 148 posix_acl_release(acl); 149 } 150 151 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | 152 inode->i_mode; 153 154 return rc; 155 } 156