V4L/DVB (9657): em28xx: add a functio to write on a single register
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / gfs2 / eaops.c
blobf114ba2b3557b780dbcde834502da0abd39a3852
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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 */
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 <linux/lm_interface.h>
18 #include <asm/uaccess.h>
20 #include "gfs2.h"
21 #include "incore.h"
22 #include "acl.h"
23 #include "eaops.h"
24 #include "eattr.h"
25 #include "util.h"
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
31 * Returns: GFS2_EATYPE_XXX
34 unsigned int gfs2_ea_name2type(const char *name, const char **truncated_name)
36 unsigned int type;
38 if (strncmp(name, "system.", 7) == 0) {
39 type = GFS2_EATYPE_SYS;
40 if (truncated_name)
41 *truncated_name = name + sizeof("system.") - 1;
42 } else if (strncmp(name, "user.", 5) == 0) {
43 type = GFS2_EATYPE_USR;
44 if (truncated_name)
45 *truncated_name = name + sizeof("user.") - 1;
46 } else if (strncmp(name, "security.", 9) == 0) {
47 type = GFS2_EATYPE_SECURITY;
48 if (truncated_name)
49 *truncated_name = name + sizeof("security.") - 1;
50 } else {
51 type = GFS2_EATYPE_UNUSED;
52 if (truncated_name)
53 *truncated_name = NULL;
56 return type;
59 static int system_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
61 if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
62 !GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len) &&
63 !capable(CAP_SYS_ADMIN))
64 return -EPERM;
66 if (GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl == 0 &&
67 (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) ||
68 GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
69 return -EOPNOTSUPP;
71 return gfs2_ea_get_i(ip, er);
74 static int system_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
76 int remove = 0;
77 int error;
79 if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
80 if (!(er->er_flags & GFS2_ERF_MODE)) {
81 er->er_mode = ip->i_inode.i_mode;
82 er->er_flags |= GFS2_ERF_MODE;
84 error = gfs2_acl_validate_set(ip, 1, er,
85 &remove, &er->er_mode);
86 if (error)
87 return error;
88 error = gfs2_ea_set_i(ip, er);
89 if (error)
90 return error;
91 if (remove)
92 gfs2_ea_remove_i(ip, er);
93 return 0;
95 } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
96 error = gfs2_acl_validate_set(ip, 0, er,
97 &remove, NULL);
98 if (error)
99 return error;
100 if (!remove)
101 error = gfs2_ea_set_i(ip, er);
102 else {
103 error = gfs2_ea_remove_i(ip, er);
104 if (error == -ENODATA)
105 error = 0;
107 return error;
110 return -EPERM;
113 static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
115 if (GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len)) {
116 int error = gfs2_acl_validate_remove(ip, 1);
117 if (error)
118 return error;
120 } else if (GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)) {
121 int error = gfs2_acl_validate_remove(ip, 0);
122 if (error)
123 return error;
125 } else
126 return -EPERM;
128 return gfs2_ea_remove_i(ip, er);
131 static const struct gfs2_eattr_operations gfs2_user_eaops = {
132 .eo_get = gfs2_ea_get_i,
133 .eo_set = gfs2_ea_set_i,
134 .eo_remove = gfs2_ea_remove_i,
135 .eo_name = "user",
138 const struct gfs2_eattr_operations gfs2_system_eaops = {
139 .eo_get = system_eo_get,
140 .eo_set = system_eo_set,
141 .eo_remove = system_eo_remove,
142 .eo_name = "system",
145 static const struct gfs2_eattr_operations gfs2_security_eaops = {
146 .eo_get = gfs2_ea_get_i,
147 .eo_set = gfs2_ea_set_i,
148 .eo_remove = gfs2_ea_remove_i,
149 .eo_name = "security",
152 const struct gfs2_eattr_operations *gfs2_ea_ops[] = {
153 NULL,
154 &gfs2_user_eaops,
155 &gfs2_system_eaops,
156 &gfs2_security_eaops,