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 break; 81 case ACL_TYPE_DEFAULT: 82 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT; 83 break; 84 default: 85 return -EINVAL; 86 } 87 88 if (acl) { 89 size = posix_acl_xattr_size(acl->a_count); 90 value = kmalloc(size, GFP_KERNEL); 91 if (!value) 92 return -ENOMEM; 93 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size); 94 if (rc < 0) 95 goto out; 96 } 97 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); 98 out: 99 kfree(value); 100 101 if (!rc) 102 set_cached_acl(inode, type, acl); 103 104 return rc; 105 } 106 107 int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type) 108 { 109 int rc; 110 tid_t tid; 111 int update_mode = 0; 112 umode_t mode = inode->i_mode; 113 114 tid = txBegin(inode->i_sb, 0); 115 mutex_lock(&JFS_IP(inode)->commit_mutex); 116 if (type == ACL_TYPE_ACCESS && acl) { 117 rc = posix_acl_update_mode(inode, &mode, &acl); 118 if (rc) 119 goto end_tx; 120 if (mode != inode->i_mode) 121 update_mode = 1; 122 } 123 rc = __jfs_set_acl(tid, inode, type, acl); 124 if (!rc) { 125 if (update_mode) { 126 inode->i_mode = mode; 127 inode->i_ctime = current_time(inode); 128 mark_inode_dirty(inode); 129 } 130 rc = txCommit(tid, 1, &inode, 0); 131 } 132 end_tx: 133 txEnd(tid); 134 mutex_unlock(&JFS_IP(inode)->commit_mutex); 135 return rc; 136 } 137 138 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) 139 { 140 struct posix_acl *default_acl, *acl; 141 int rc = 0; 142 143 rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 144 if (rc) 145 return rc; 146 147 if (default_acl) { 148 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl); 149 posix_acl_release(default_acl); 150 } else { 151 inode->i_default_acl = NULL; 152 } 153 154 if (acl) { 155 if (!rc) 156 rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl); 157 posix_acl_release(acl); 158 } else { 159 inode->i_acl = NULL; 160 } 161 162 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | 163 inode->i_mode; 164 165 return rc; 166 } 167