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