blob: 1a7877fe73934c05b58d7d98e45ffa4bc9d6d971 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/xattr.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050016#include <linux/gfs2_ondisk.h>
Fabio Massimo Di Nitto7d308592006-09-19 07:56:29 +020017#include <linux/lm_interface.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000018#include <asm/uaccess.h>
19
20#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050021#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000022#include "acl.h"
23#include "eaops.h"
24#include "eattr.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050025#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000026
27/**
28 * gfs2_ea_name2type - get the type of the ea, and truncate type from the name
29 * @namep: ea name, possibly with type appended
30 *
31 * Returns: GFS2_EATYPE_XXX
32 */
33
Steven Whitehousecca195c2006-09-05 13:15:18 -040034unsigned int gfs2_ea_name2type(const char *name, const char **truncated_name)
David Teiglandb3b94fa2006-01-16 16:50:04 +000035{
36 unsigned int type;
37
38 if (strncmp(name, "system.", 7) == 0) {
39 type = GFS2_EATYPE_SYS;
40 if (truncated_name)
Steven Whitehousecca195c2006-09-05 13:15:18 -040041 *truncated_name = name + sizeof("system.") - 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +000042 } else if (strncmp(name, "user.", 5) == 0) {
43 type = GFS2_EATYPE_USR;
44 if (truncated_name)
Steven Whitehousecca195c2006-09-05 13:15:18 -040045 *truncated_name = name + sizeof("user.") - 1;
Ryan O'Hara639b6d72006-05-22 10:08:35 -040046 } else if (strncmp(name, "security.", 9) == 0) {
47 type = GFS2_EATYPE_SECURITY;
48 if (truncated_name)
Steven Whitehousecca195c2006-09-05 13:15:18 -040049 *truncated_name = name + sizeof("security.") - 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +000050 } else {
51 type = GFS2_EATYPE_UNUSED;
52 if (truncated_name)
53 *truncated_name = NULL;
54 }
55
56 return type;
57}
58
59static int user_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
60{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040061 struct inode *inode = &ip->i_inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +000062 int error = permission(inode, MAY_READ, NULL);
63 if (error)
64 return error;
65
66 return gfs2_ea_get_i(ip, er);
67}
68
69static int user_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
70{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040071 struct inode *inode = &ip->i_inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +000072
73 if (S_ISREG(inode->i_mode) ||
74 (S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
75 int error = permission(inode, MAY_WRITE, NULL);
76 if (error)
77 return error;
78 } else
79 return -EPERM;
80
81 return gfs2_ea_set_i(ip, er);
82}
83
84static int user_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
85{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040086 struct inode *inode = &ip->i_inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +000087
88 if (S_ISREG(inode->i_mode) ||
89 (S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
90 int error = permission(inode, MAY_WRITE, NULL);
91 if (error)
92 return error;
93 } else
94 return -EPERM;
95
96 return gfs2_ea_remove_i(ip, er);
97}
98
99static int system_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
100{
101 if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
102 !GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) &&
103 !capable(CAP_SYS_ADMIN))
104 return -EPERM;
105
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400106 if (GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl == 0 &&
David Teiglandb3b94fa2006-01-16 16:50:04 +0000107 (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) ||
108 GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
109 return -EOPNOTSUPP;
110
111
112
113 return gfs2_ea_get_i(ip, er);
114}
115
116static int system_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
117{
118 int remove = 0;
119 int error;
120
121 if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
122 if (!(er->er_flags & GFS2_ERF_MODE)) {
123 er->er_mode = ip->i_di.di_mode;
124 er->er_flags |= GFS2_ERF_MODE;
125 }
126 error = gfs2_acl_validate_set(ip, 1, er,
127 &remove, &er->er_mode);
128 if (error)
129 return error;
130 error = gfs2_ea_set_i(ip, er);
131 if (error)
132 return error;
133 if (remove)
134 gfs2_ea_remove_i(ip, er);
135 return 0;
136
137 } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
138 error = gfs2_acl_validate_set(ip, 0, er,
139 &remove, NULL);
140 if (error)
141 return error;
142 if (!remove)
143 error = gfs2_ea_set_i(ip, er);
144 else {
145 error = gfs2_ea_remove_i(ip, er);
146 if (error == -ENODATA)
147 error = 0;
148 }
149 return error;
150 }
151
152 return -EPERM;
153}
154
155static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
156{
157 if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
158 int error = gfs2_acl_validate_remove(ip, 1);
159 if (error)
160 return error;
161
162 } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
163 int error = gfs2_acl_validate_remove(ip, 0);
164 if (error)
165 return error;
166
167 } else
168 return -EPERM;
169
170 return gfs2_ea_remove_i(ip, er);
171}
172
Ryan O'Hara639b6d72006-05-22 10:08:35 -0400173static int security_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
174{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400175 struct inode *inode = &ip->i_inode;
Ryan O'Hara639b6d72006-05-22 10:08:35 -0400176 int error = permission(inode, MAY_READ, NULL);
177 if (error)
178 return error;
179
180 return gfs2_ea_get_i(ip, er);
181}
182
183static int security_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
184{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400185 struct inode *inode = &ip->i_inode;
Ryan O'Hara639b6d72006-05-22 10:08:35 -0400186 int error = permission(inode, MAY_WRITE, NULL);
187 if (error)
188 return error;
189
190 return gfs2_ea_set_i(ip, er);
191}
192
193static int security_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
194{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400195 struct inode *inode = &ip->i_inode;
Ryan O'Hara639b6d72006-05-22 10:08:35 -0400196 int error = permission(inode, MAY_WRITE, NULL);
197 if (error)
198 return error;
199
200 return gfs2_ea_remove_i(ip, er);
201}
202
Adrian Bunk08bc2db2006-04-28 10:59:12 -0400203static struct gfs2_eattr_operations gfs2_user_eaops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000204 .eo_get = user_eo_get,
205 .eo_set = user_eo_set,
206 .eo_remove = user_eo_remove,
207 .eo_name = "user",
208};
209
210struct gfs2_eattr_operations gfs2_system_eaops = {
211 .eo_get = system_eo_get,
212 .eo_set = system_eo_set,
213 .eo_remove = system_eo_remove,
214 .eo_name = "system",
215};
216
Adrian Bunk43f5d212006-06-22 11:16:40 -0400217static struct gfs2_eattr_operations gfs2_security_eaops = {
Ryan O'Hara639b6d72006-05-22 10:08:35 -0400218 .eo_get = security_eo_get,
219 .eo_set = security_eo_set,
220 .eo_remove = security_eo_remove,
221 .eo_name = "security",
222};
223
David Teiglandb3b94fa2006-01-16 16:50:04 +0000224struct gfs2_eattr_operations *gfs2_ea_ops[] = {
225 NULL,
226 &gfs2_user_eaops,
227 &gfs2_system_eaops,
Ryan O'Harae70409f2006-05-25 17:36:15 -0400228 &gfs2_security_eaops,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000229};
230