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) 18 { 19 struct posix_acl *acl; 20 char *ea_name; 21 int size; 22 char *value = NULL; 23 24 switch(type) { 25 case ACL_TYPE_ACCESS: 26 ea_name = XATTR_NAME_POSIX_ACL_ACCESS; 27 break; 28 case ACL_TYPE_DEFAULT: 29 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT; 30 break; 31 default: 32 return ERR_PTR(-EINVAL); 33 } 34 35 size = __jfs_getxattr(inode, ea_name, NULL, 0); 36 37 if (size > 0) { 38 value = kmalloc(size, GFP_KERNEL); 39 if (!value) 40 return ERR_PTR(-ENOMEM); 41 size = __jfs_getxattr(inode, ea_name, value, size); 42 } 43 44 if (size < 0) { 45 if (size == -ENODATA) 46 acl = NULL; 47 else 48 acl = ERR_PTR(size); 49 } else { 50 acl = posix_acl_from_xattr(&init_user_ns, value, size); 51 } 52 kfree(value); 53 return acl; 54 } 55 56 static int __jfs_set_acl(tid_t tid, struct inode *inode, int type, 57 struct posix_acl *acl) 58 { 59 char *ea_name; 60 int rc; 61 int size = 0; 62 char *value = NULL; 63 64 switch (type) { 65 case ACL_TYPE_ACCESS: 66 ea_name = XATTR_NAME_POSIX_ACL_ACCESS; 67 break; 68 case ACL_TYPE_DEFAULT: 69 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT; 70 break; 71 default: 72 return -EINVAL; 73 } 74 75 if (acl) { 76 size = posix_acl_xattr_size(acl->a_count); 77 value = kmalloc(size, GFP_KERNEL); 78 if (!value) 79 return -ENOMEM; 80 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size); 81 if (rc < 0) 82 goto out; 83 } 84 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); 85 out: 86 kfree(value); 87 88 if (!rc) 89 set_cached_acl(inode, type, acl); 90 91 return rc; 92 } 93 94 int jfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, 95 struct posix_acl *acl, int type) 96 { 97 int rc; 98 tid_t tid; 99 int update_mode = 0; 100 umode_t mode = inode->i_mode; 101 102 tid = txBegin(inode->i_sb, 0); 103 mutex_lock(&JFS_IP(inode)->commit_mutex); 104 if (type == ACL_TYPE_ACCESS && acl) { 105 rc = posix_acl_update_mode(&init_user_ns, inode, &mode, &acl); 106 if (rc) 107 goto end_tx; 108 if (mode != inode->i_mode) 109 update_mode = 1; 110 } 111 rc = __jfs_set_acl(tid, inode, type, acl); 112 if (!rc) { 113 if (update_mode) { 114 inode->i_mode = mode; 115 inode->i_ctime = current_time(inode); 116 mark_inode_dirty(inode); 117 } 118 rc = txCommit(tid, 1, &inode, 0); 119 } 120 end_tx: 121 txEnd(tid); 122 mutex_unlock(&JFS_IP(inode)->commit_mutex); 123 return rc; 124 } 125 126 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) 127 { 128 struct posix_acl *default_acl, *acl; 129 int rc = 0; 130 131 rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); 132 if (rc) 133 return rc; 134 135 if (default_acl) { 136 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl); 137 posix_acl_release(default_acl); 138 } else { 139 inode->i_default_acl = NULL; 140 } 141 142 if (acl) { 143 if (!rc) 144 rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl); 145 posix_acl_release(acl); 146 } else { 147 inode->i_acl = NULL; 148 } 149 150 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | 151 inode->i_mode; 152 153 return rc; 154 } 155