1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) International Business Machines Corp., 2002-2004 4 * Copyright (C) Andreas Gruenbacher, 2001 5 * Copyright (C) Linus Torvalds, 1991, 1992 6 */ 7 8 #include <linux/sched.h> 9 #include <linux/slab.h> 10 #include <linux/fs.h> 11 #include <linux/posix_acl_xattr.h> 12 #include "jfs_incore.h" 13 #include "jfs_txnmgr.h" 14 #include "jfs_xattr.h" 15 #include "jfs_acl.h" 16 17 struct posix_acl *jfs_get_acl(struct inode *inode, int type, bool rcu) 18 { 19 struct posix_acl *acl; 20 char *ea_name; 21 int size; 22 char *value = NULL; 23 24 if (rcu) 25 return ERR_PTR(-ECHILD); 26 27 switch(type) { 28 case ACL_TYPE_ACCESS: 29 ea_name = XATTR_NAME_POSIX_ACL_ACCESS; 30 break; 31 case ACL_TYPE_DEFAULT: 32 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT; 33 break; 34 default: 35 return ERR_PTR(-EINVAL); 36 } 37 38 size = __jfs_getxattr(inode, ea_name, NULL, 0); 39 40 if (size > 0) { 41 value = kmalloc(size, GFP_KERNEL); 42 if (!value) 43 return ERR_PTR(-ENOMEM); 44 size = __jfs_getxattr(inode, ea_name, value, size); 45 } 46 47 if (size < 0) { 48 if (size == -ENODATA) 49 acl = NULL; 50 else 51 acl = ERR_PTR(size); 52 } else { 53 acl = posix_acl_from_xattr(&init_user_ns, value, size); 54 } 55 kfree(value); 56 return acl; 57 } 58 59 static int __jfs_set_acl(tid_t tid, struct inode *inode, int type, 60 struct posix_acl *acl) 61 { 62 char *ea_name; 63 int rc; 64 int size = 0; 65 char *value = NULL; 66 67 switch (type) { 68 case ACL_TYPE_ACCESS: 69 ea_name = XATTR_NAME_POSIX_ACL_ACCESS; 70 break; 71 case ACL_TYPE_DEFAULT: 72 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT; 73 break; 74 default: 75 return -EINVAL; 76 } 77 78 if (acl) { 79 size = posix_acl_xattr_size(acl->a_count); 80 value = kmalloc(size, GFP_KERNEL); 81 if (!value) 82 return -ENOMEM; 83 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size); 84 if (rc < 0) 85 goto out; 86 } 87 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); 88 out: 89 kfree(value); 90 91 if (!rc) 92 set_cached_acl(inode, type, acl); 93 94 return rc; 95 } 96 97 int jfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, 98 struct posix_acl *acl, int type) 99 { 100 int rc; 101 tid_t tid; 102 int update_mode = 0; 103 struct inode *inode = d_inode(dentry); 104 umode_t mode = inode->i_mode; 105 106 tid = txBegin(inode->i_sb, 0); 107 mutex_lock(&JFS_IP(inode)->commit_mutex); 108 if (type == ACL_TYPE_ACCESS && acl) { 109 rc = posix_acl_update_mode(&init_user_ns, inode, &mode, &acl); 110 if (rc) 111 goto end_tx; 112 if (mode != inode->i_mode) 113 update_mode = 1; 114 } 115 rc = __jfs_set_acl(tid, inode, type, acl); 116 if (!rc) { 117 if (update_mode) { 118 inode->i_mode = mode; 119 inode->i_ctime = current_time(inode); 120 mark_inode_dirty(inode); 121 } 122 rc = txCommit(tid, 1, &inode, 0); 123 } 124 end_tx: 125 txEnd(tid); 126 mutex_unlock(&JFS_IP(inode)->commit_mutex); 127 return rc; 128 } 129 130 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) 131 { 132 struct posix_acl *default_acl, *acl; 133 int rc = 0; 134 135 rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 136 if (rc) 137 return rc; 138 139 if (default_acl) { 140 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl); 141 posix_acl_release(default_acl); 142 } else { 143 inode->i_default_acl = NULL; 144 } 145 146 if (acl) { 147 if (!rc) 148 rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl); 149 posix_acl_release(acl); 150 } else { 151 inode->i_acl = NULL; 152 } 153 154 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | 155 inode->i_mode; 156 157 return rc; 158 } 159