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 jfs_get_acl(struct inode * inode,int type)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 acl = get_cached_acl(inode, type); 38 if (acl != ACL_NOT_CACHED) 39 return acl; 40 41 switch(type) { 42 case ACL_TYPE_ACCESS: 43 ea_name = POSIX_ACL_XATTR_ACCESS; 44 break; 45 case ACL_TYPE_DEFAULT: 46 ea_name = POSIX_ACL_XATTR_DEFAULT; 47 break; 48 default: 49 return ERR_PTR(-EINVAL); 50 } 51 52 size = __jfs_getxattr(inode, ea_name, NULL, 0); 53 54 if (size > 0) { 55 value = kmalloc(size, GFP_KERNEL); 56 if (!value) 57 return ERR_PTR(-ENOMEM); 58 size = __jfs_getxattr(inode, ea_name, value, size); 59 } 60 61 if (size < 0) { 62 if (size == -ENODATA) 63 acl = NULL; 64 else 65 acl = ERR_PTR(size); 66 } else { 67 acl = posix_acl_from_xattr(&init_user_ns, value, size); 68 } 69 kfree(value); 70 if (!IS_ERR(acl)) 71 set_cached_acl(inode, type, acl); 72 return acl; 73 } 74 __jfs_set_acl(tid_t tid,struct inode * inode,int type,struct posix_acl * acl)75 static int __jfs_set_acl(tid_t tid, struct inode *inode, int type, 76 struct posix_acl *acl) 77 { 78 char *ea_name; 79 int rc; 80 int size = 0; 81 char *value = NULL; 82 83 switch (type) { 84 case ACL_TYPE_ACCESS: 85 ea_name = POSIX_ACL_XATTR_ACCESS; 86 if (acl) { 87 rc = posix_acl_update_mode(inode, &inode->i_mode, &acl); 88 if (rc) 89 return rc; 90 inode->i_ctime = CURRENT_TIME; 91 mark_inode_dirty(inode); 92 } 93 break; 94 case ACL_TYPE_DEFAULT: 95 ea_name = POSIX_ACL_XATTR_DEFAULT; 96 break; 97 default: 98 return -EINVAL; 99 } 100 101 if (acl) { 102 size = posix_acl_xattr_size(acl->a_count); 103 value = kmalloc(size, GFP_KERNEL); 104 if (!value) 105 return -ENOMEM; 106 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size); 107 if (rc < 0) 108 goto out; 109 } 110 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); 111 out: 112 kfree(value); 113 114 if (!rc) 115 set_cached_acl(inode, type, acl); 116 117 return rc; 118 } 119 jfs_set_acl(struct inode * inode,struct posix_acl * acl,int type)120 int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type) 121 { 122 int rc; 123 tid_t tid; 124 125 tid = txBegin(inode->i_sb, 0); 126 mutex_lock(&JFS_IP(inode)->commit_mutex); 127 rc = __jfs_set_acl(tid, inode, type, acl); 128 if (!rc) 129 rc = txCommit(tid, 1, &inode, 0); 130 txEnd(tid); 131 mutex_unlock(&JFS_IP(inode)->commit_mutex); 132 return rc; 133 } 134 jfs_init_acl(tid_t tid,struct inode * inode,struct inode * dir)135 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) 136 { 137 struct posix_acl *default_acl, *acl; 138 int rc = 0; 139 140 rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 141 if (rc) 142 return rc; 143 144 if (default_acl) { 145 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl); 146 posix_acl_release(default_acl); 147 } 148 149 if (acl) { 150 if (!rc) 151 rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl); 152 posix_acl_release(acl); 153 } 154 155 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | 156 inode->i_mode; 157 158 return rc; 159 } 160