1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /*
24 * Copyright (C) 2011 Lawrence Livermore National Security, LLC.
25 */
26
27 #ifndef _ZFS_XATTR_H
28 #define _ZFS_XATTR_H
29
30 #include <linux/posix_acl_xattr.h>
31
32 /*
33 * 2.6.35 API change,
34 * The const keyword was added to the 'struct xattr_handler' in the
35 * generic Linux super_block structure. To handle this we define an
36 * appropriate xattr_handler_t typedef which can be used. This was
37 * the preferred solution because it keeps the code clean and readable.
38 */
39 typedef const struct xattr_handler xattr_handler_t;
40
41 /*
42 * 4.5 API change,
43 */
44 #define ZPL_XATTR_LIST_WRAPPER(fn) \
45 static bool \
46 fn(struct dentry *dentry) \
47 { \
48 return (!!__ ## fn(dentry->d_inode, NULL, 0, NULL, 0)); \
49 }
50
51 #ifdef HAVE_XATTR_GET_DENTRY_INODE_FLAGS
52 /*
53 * Android API change,
54 * The xattr_handler->get() callback also takes a flags arg.
55 */
56 #define ZPL_XATTR_GET_WRAPPER(fn) \
57 static int \
58 fn(const struct xattr_handler *handler, struct dentry *dentry, \
59 struct inode *inode, const char *name, void *buffer, \
60 size_t size, int flags) \
61 { \
62 return (__ ## fn(inode, name, buffer, size)); \
63 }
64 #else
65 #define ZPL_XATTR_GET_WRAPPER(fn) \
66 static int \
67 fn(const struct xattr_handler *handler, struct dentry *dentry, \
68 struct inode *inode, const char *name, void *buffer, size_t size) \
69 { \
70 return (__ ## fn(inode, name, buffer, size)); \
71 }
72 #endif
73
74 /*
75 * 6.3 API change,
76 * The xattr_handler->set() callback was changed to take the
77 * struct mnt_idmap* as the first arg, to support idmapped
78 * mounts.
79 */
80 #if defined(HAVE_XATTR_SET_IDMAP)
81 #define ZPL_XATTR_SET_WRAPPER(fn) \
82 static int \
83 fn(const struct xattr_handler *handler, struct mnt_idmap *user_ns, \
84 struct dentry *dentry, struct inode *inode, const char *name, \
85 const void *buffer, size_t size, int flags) \
86 { \
87 return (__ ## fn(user_ns, inode, name, buffer, size, flags)); \
88 }
89 /*
90 * 5.12 API change,
91 * The xattr_handler->set() callback was changed to take the
92 * struct user_namespace* as the first arg, to support idmapped
93 * mounts.
94 */
95 #elif defined(HAVE_XATTR_SET_USERNS)
96 #define ZPL_XATTR_SET_WRAPPER(fn) \
97 static int \
98 fn(const struct xattr_handler *handler, struct user_namespace *user_ns, \
99 struct dentry *dentry, struct inode *inode, const char *name, \
100 const void *buffer, size_t size, int flags) \
101 { \
102 return (__ ## fn(user_ns, inode, name, buffer, size, flags)); \
103 }
104 /*
105 * 4.7 API change,
106 * The xattr_handler->set() callback was changed to take a both dentry and
107 * inode, because the dentry might not be attached to an inode yet.
108 */
109 #elif defined(HAVE_XATTR_SET_DENTRY_INODE)
110 #define ZPL_XATTR_SET_WRAPPER(fn) \
111 static int \
112 fn(const struct xattr_handler *handler, struct dentry *dentry, \
113 struct inode *inode, const char *name, const void *buffer, \
114 size_t size, int flags) \
115 { \
116 return (__ ## fn(kcred->user_ns, inode, name, buffer, size, flags));\
117 }
118 #else
119 #error "Unsupported kernel"
120 #endif
121
122 /*
123 * Linux 3.7 API change. posix_acl_{from,to}_xattr gained the user_ns
124 * parameter. All callers are expected to pass the &init_user_ns which
125 * is available through the init credential (kcred).
126 */
127 static inline struct posix_acl *
zpl_acl_from_xattr(const void * value,int size)128 zpl_acl_from_xattr(const void *value, int size)
129 {
130 return (posix_acl_from_xattr(kcred->user_ns, value, size));
131 }
132
133 static inline int
zpl_acl_to_xattr(struct posix_acl * acl,void * value,int size)134 zpl_acl_to_xattr(struct posix_acl *acl, void *value, int size)
135 {
136 return (posix_acl_to_xattr(kcred->user_ns, acl, value, size));
137 }
138
139 #endif /* _ZFS_XATTR_H */
140