1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * (C) 2001 Clemson University and The University of Chicago
4 *
5 * See COPYING in top-level directory.
6 */
7
8 #include "protocol.h"
9 #include "orangefs-kernel.h"
10 #include "orangefs-bufmap.h"
11 #include <linux/posix_acl_xattr.h>
12
orangefs_get_acl(struct inode * inode,int type,bool rcu)13 struct posix_acl *orangefs_get_acl(struct inode *inode, int type, bool rcu)
14 {
15 struct posix_acl *acl;
16 int ret;
17 char *key = NULL, *value = NULL;
18
19 if (rcu)
20 return ERR_PTR(-ECHILD);
21
22 switch (type) {
23 case ACL_TYPE_ACCESS:
24 key = XATTR_NAME_POSIX_ACL_ACCESS;
25 break;
26 case ACL_TYPE_DEFAULT:
27 key = XATTR_NAME_POSIX_ACL_DEFAULT;
28 break;
29 default:
30 gossip_err("orangefs_get_acl: bogus value of type %d\n", type);
31 return ERR_PTR(-EINVAL);
32 }
33 /*
34 * Rather than incurring a network call just to determine the exact
35 * length of the attribute, I just allocate a max length to save on
36 * the network call. Conceivably, we could pass NULL to
37 * orangefs_inode_getxattr() to probe the length of the value, but
38 * I don't do that for now.
39 */
40 value = kmalloc(ORANGEFS_MAX_XATTR_VALUELEN, GFP_KERNEL);
41 if (!value)
42 return ERR_PTR(-ENOMEM);
43
44 gossip_debug(GOSSIP_ACL_DEBUG,
45 "inode %pU, key %s, type %d\n",
46 get_khandle_from_ino(inode),
47 key,
48 type);
49 ret = orangefs_inode_getxattr(inode, key, value,
50 ORANGEFS_MAX_XATTR_VALUELEN);
51 /* if the key exists, convert it to an in-memory rep */
52 if (ret > 0) {
53 acl = posix_acl_from_xattr(&init_user_ns, value, ret);
54 } else if (ret == -ENODATA || ret == -ENOSYS) {
55 acl = NULL;
56 } else {
57 gossip_err("inode %pU retrieving acl's failed with error %d\n",
58 get_khandle_from_ino(inode),
59 ret);
60 acl = ERR_PTR(ret);
61 }
62 /* kfree(NULL) is safe, so don't worry if value ever got used */
63 kfree(value);
64 return acl;
65 }
66
__orangefs_set_acl(struct inode * inode,struct posix_acl * acl,int type)67 int __orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
68 {
69 int error = 0;
70 void *value = NULL;
71 size_t size = 0;
72 const char *name = NULL;
73
74 switch (type) {
75 case ACL_TYPE_ACCESS:
76 name = XATTR_NAME_POSIX_ACL_ACCESS;
77 break;
78 case ACL_TYPE_DEFAULT:
79 name = XATTR_NAME_POSIX_ACL_DEFAULT;
80 break;
81 default:
82 gossip_err("%s: invalid type %d!\n", __func__, type);
83 return -EINVAL;
84 }
85
86 gossip_debug(GOSSIP_ACL_DEBUG,
87 "%s: inode %pU, key %s type %d\n",
88 __func__, get_khandle_from_ino(inode),
89 name,
90 type);
91
92 if (acl) {
93 size = posix_acl_xattr_size(acl->a_count);
94 value = kmalloc(size, GFP_KERNEL);
95 if (!value)
96 return -ENOMEM;
97
98 error = posix_acl_to_xattr(&init_user_ns, acl, value, size);
99 if (error < 0)
100 goto out;
101 }
102
103 gossip_debug(GOSSIP_ACL_DEBUG,
104 "%s: name %s, value %p, size %zd, acl %p\n",
105 __func__, name, value, size, acl);
106 /*
107 * Go ahead and set the extended attribute now. NOTE: Suppose acl
108 * was NULL, then value will be NULL and size will be 0 and that
109 * will xlate to a removexattr. However, we don't want removexattr
110 * complain if attributes does not exist.
111 */
112 error = orangefs_inode_setxattr(inode, name, value, size, 0);
113
114 out:
115 kfree(value);
116 if (!error)
117 set_cached_acl(inode, type, acl);
118 return error;
119 }
120
orangefs_set_acl(struct mnt_idmap * idmap,struct dentry * dentry,struct posix_acl * acl,int type)121 int orangefs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
122 struct posix_acl *acl, int type)
123 {
124 int error;
125 struct iattr iattr;
126 int rc;
127 struct inode *inode = d_inode(dentry);
128
129 memset(&iattr, 0, sizeof iattr);
130
131 if (type == ACL_TYPE_ACCESS && acl) {
132 /*
133 * posix_acl_update_mode checks to see if the permissions
134 * described by the ACL can be encoded into the
135 * object's mode. If so, it sets "acl" to NULL
136 * and "mode" to the new desired value. It is up to
137 * us to propagate the new mode back to the server...
138 */
139 error = posix_acl_update_mode(&nop_mnt_idmap, inode,
140 &iattr.ia_mode, &acl);
141 if (error) {
142 gossip_err("%s: posix_acl_update_mode err: %d\n",
143 __func__,
144 error);
145 return error;
146 }
147
148 if (inode->i_mode != iattr.ia_mode)
149 iattr.ia_valid = ATTR_MODE;
150
151 }
152
153 rc = __orangefs_set_acl(inode, acl, type);
154
155 if (!rc && (iattr.ia_valid == ATTR_MODE))
156 rc = __orangefs_setattr_mode(dentry, &iattr);
157
158 return rc;
159 }
160