1 /*
2 * (C) 2001 Clemson University and The University of Chicago
3 *
4 * See COPYING in top-level directory.
5 */
6
7 #include "protocol.h"
8 #include "orangefs-kernel.h"
9 #include "orangefs-bufmap.h"
10 #include <linux/posix_acl_xattr.h>
11 #include <linux/fs_struct.h>
12
orangefs_get_acl(struct inode * inode,int type)13 struct posix_acl *orangefs_get_acl(struct inode *inode, int type)
14 {
15 struct posix_acl *acl;
16 int ret;
17 char *key = NULL, *value = NULL;
18
19 switch (type) {
20 case ACL_TYPE_ACCESS:
21 key = XATTR_NAME_POSIX_ACL_ACCESS;
22 break;
23 case ACL_TYPE_DEFAULT:
24 key = XATTR_NAME_POSIX_ACL_DEFAULT;
25 break;
26 default:
27 gossip_err("orangefs_get_acl: bogus value of type %d\n", type);
28 return ERR_PTR(-EINVAL);
29 }
30 /*
31 * Rather than incurring a network call just to determine the exact
32 * length of the attribute, I just allocate a max length to save on
33 * the network call. Conceivably, we could pass NULL to
34 * orangefs_inode_getxattr() to probe the length of the value, but
35 * I don't do that for now.
36 */
37 value = kmalloc(ORANGEFS_MAX_XATTR_VALUELEN, GFP_KERNEL);
38 if (value == NULL)
39 return ERR_PTR(-ENOMEM);
40
41 gossip_debug(GOSSIP_ACL_DEBUG,
42 "inode %pU, key %s, type %d\n",
43 get_khandle_from_ino(inode),
44 key,
45 type);
46 ret = orangefs_inode_getxattr(inode, key, value,
47 ORANGEFS_MAX_XATTR_VALUELEN);
48 /* if the key exists, convert it to an in-memory rep */
49 if (ret > 0) {
50 acl = posix_acl_from_xattr(&init_user_ns, value, ret);
51 } else if (ret == -ENODATA || ret == -ENOSYS) {
52 acl = NULL;
53 } else {
54 gossip_err("inode %pU retrieving acl's failed with error %d\n",
55 get_khandle_from_ino(inode),
56 ret);
57 acl = ERR_PTR(ret);
58 }
59 /* kfree(NULL) is safe, so don't worry if value ever got used */
60 kfree(value);
61 return acl;
62 }
63
__orangefs_set_acl(struct inode * inode,struct posix_acl * acl,int type)64 static int __orangefs_set_acl(struct inode *inode, struct posix_acl *acl,
65 int type)
66 {
67 int error = 0;
68 void *value = NULL;
69 size_t size = 0;
70 const char *name = NULL;
71
72 switch (type) {
73 case ACL_TYPE_ACCESS:
74 name = XATTR_NAME_POSIX_ACL_ACCESS;
75 break;
76 case ACL_TYPE_DEFAULT:
77 name = XATTR_NAME_POSIX_ACL_DEFAULT;
78 break;
79 default:
80 gossip_err("%s: invalid type %d!\n", __func__, type);
81 return -EINVAL;
82 }
83
84 gossip_debug(GOSSIP_ACL_DEBUG,
85 "%s: inode %pU, key %s type %d\n",
86 __func__, get_khandle_from_ino(inode),
87 name,
88 type);
89
90 if (acl) {
91 size = posix_acl_xattr_size(acl->a_count);
92 value = kmalloc(size, GFP_KERNEL);
93 if (!value)
94 return -ENOMEM;
95
96 error = posix_acl_to_xattr(&init_user_ns, acl, value, size);
97 if (error < 0)
98 goto out;
99 }
100
101 gossip_debug(GOSSIP_ACL_DEBUG,
102 "%s: name %s, value %p, size %zd, acl %p\n",
103 __func__, name, value, size, acl);
104 /*
105 * Go ahead and set the extended attribute now. NOTE: Suppose acl
106 * was NULL, then value will be NULL and size will be 0 and that
107 * will xlate to a removexattr. However, we don't want removexattr
108 * complain if attributes does not exist.
109 */
110 error = orangefs_inode_setxattr(inode, name, value, size, 0);
111
112 out:
113 kfree(value);
114 if (!error)
115 set_cached_acl(inode, type, acl);
116 return error;
117 }
118
orangefs_set_acl(struct inode * inode,struct posix_acl * acl,int type)119 int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
120 {
121 int error;
122
123 if (type == ACL_TYPE_ACCESS && acl) {
124 umode_t mode;
125
126 error = posix_acl_update_mode(inode, &mode, &acl);
127 if (error) {
128 gossip_err("%s: posix_acl_update_mode err: %d\n",
129 __func__,
130 error);
131 return error;
132 }
133
134 if (inode->i_mode != mode)
135 SetModeFlag(ORANGEFS_I(inode));
136 inode->i_mode = mode;
137 mark_inode_dirty_sync(inode);
138 }
139 return __orangefs_set_acl(inode, acl, type);
140 }
141
orangefs_init_acl(struct inode * inode,struct inode * dir)142 int orangefs_init_acl(struct inode *inode, struct inode *dir)
143 {
144 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
145 struct posix_acl *default_acl, *acl;
146 umode_t mode = inode->i_mode;
147 int error = 0;
148
149 ClearModeFlag(orangefs_inode);
150
151 error = posix_acl_create(dir, &mode, &default_acl, &acl);
152 if (error)
153 return error;
154
155 if (default_acl) {
156 error = __orangefs_set_acl(inode, default_acl,
157 ACL_TYPE_DEFAULT);
158 posix_acl_release(default_acl);
159 }
160
161 if (acl) {
162 if (!error)
163 error = __orangefs_set_acl(inode, acl, ACL_TYPE_ACCESS);
164 posix_acl_release(acl);
165 }
166
167 /* If mode of the inode was changed, then do a forcible ->setattr */
168 if (mode != inode->i_mode) {
169 SetModeFlag(orangefs_inode);
170 inode->i_mode = mode;
171 orangefs_flush_inode(inode);
172 }
173
174 return error;
175 }
176