Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6] / fs / gfs2 / eaops.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
4  *
5  * This copyrighted material is made available to anyone wishing to use,
6  * modify, copy, or redistribute it subject to the terms and conditions
7  * of the GNU General Public License version 2.
8  */
9
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/capability.h>
15 #include <linux/xattr.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <asm/uaccess.h>
18
19 #include "gfs2.h"
20 #include "incore.h"
21 #include "acl.h"
22 #include "eaops.h"
23 #include "eattr.h"
24 #include "util.h"
25
26 /**
27  * gfs2_ea_name2type - get the type of the ea, and truncate type from the name
28  * @namep: ea name, possibly with type appended
29  *
30  * Returns: GFS2_EATYPE_XXX
31  */
32
33 unsigned int gfs2_ea_name2type(const char *name, const char **truncated_name)
34 {
35         unsigned int type;
36
37         if (strncmp(name, "system.", 7) == 0) {
38                 type = GFS2_EATYPE_SYS;
39                 if (truncated_name)
40                         *truncated_name = name + sizeof("system.") - 1;
41         } else if (strncmp(name, "user.", 5) == 0) {
42                 type = GFS2_EATYPE_USR;
43                 if (truncated_name)
44                         *truncated_name = name + sizeof("user.") - 1;
45         } else if (strncmp(name, "security.", 9) == 0) {
46                 type = GFS2_EATYPE_SECURITY;
47                 if (truncated_name)
48                         *truncated_name = name + sizeof("security.") - 1;
49         } else {
50                 type = GFS2_EATYPE_UNUSED;
51                 if (truncated_name)
52                         *truncated_name = NULL;
53         }
54
55         return type;
56 }
57
58 static int system_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
59 {
60         if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
61             !GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) &&
62             !capable(CAP_SYS_ADMIN))
63                 return -EPERM;
64
65         if (GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl == 0 &&
66             (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) ||
67              GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
68                 return -EOPNOTSUPP;
69
70         return gfs2_ea_get_i(ip, er);
71 }
72
73 static int system_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
74 {
75         int remove = 0;
76         int error;
77
78         if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
79                 if (!(er->er_flags & GFS2_ERF_MODE)) {
80                         er->er_mode = ip->i_inode.i_mode;
81                         er->er_flags |= GFS2_ERF_MODE;
82                 }
83                 error = gfs2_acl_validate_set(ip, 1, er,
84                                               &remove, &er->er_mode);
85                 if (error)
86                         return error;
87                 error = gfs2_ea_set_i(ip, er);
88                 if (error)
89                         return error;
90                 if (remove)
91                         gfs2_ea_remove_i(ip, er);
92                 return 0;
93
94         } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
95                 error = gfs2_acl_validate_set(ip, 0, er,
96                                               &remove, NULL);
97                 if (error)
98                         return error;
99                 if (!remove)
100                         error = gfs2_ea_set_i(ip, er);
101                 else {
102                         error = gfs2_ea_remove_i(ip, er);
103                         if (error == -ENODATA)
104                                 error = 0;
105                 }
106                 return error;
107         }
108
109         return -EPERM;
110 }
111
112 static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
113 {
114         if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
115                 int error = gfs2_acl_validate_remove(ip, 1);
116                 if (error)
117                         return error;
118
119         } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
120                 int error = gfs2_acl_validate_remove(ip, 0);
121                 if (error)
122                         return error;
123
124         } else
125                 return -EPERM;
126
127         return gfs2_ea_remove_i(ip, er);
128 }
129
130 static const struct gfs2_eattr_operations gfs2_user_eaops = {
131         .eo_get = gfs2_ea_get_i,
132         .eo_set = gfs2_ea_set_i,
133         .eo_remove = gfs2_ea_remove_i,
134         .eo_name = "user",
135 };
136
137 const struct gfs2_eattr_operations gfs2_system_eaops = {
138         .eo_get = system_eo_get,
139         .eo_set = system_eo_set,
140         .eo_remove = system_eo_remove,
141         .eo_name = "system",
142 };
143
144 static const struct gfs2_eattr_operations gfs2_security_eaops = {
145         .eo_get = gfs2_ea_get_i,
146         .eo_set = gfs2_ea_set_i,
147         .eo_remove = gfs2_ea_remove_i,
148         .eo_name = "security",
149 };
150
151 const struct gfs2_eattr_operations *gfs2_ea_ops[] = {
152         NULL,
153         &gfs2_user_eaops,
154         &gfs2_system_eaops,
155         &gfs2_security_eaops,
156 };
157