Commit | Line | Data |
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7221fe4c GZ |
1 | /* |
2 | * linux/fs/ceph/acl.c | |
3 | * | |
4 | * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public | |
8 | * License v2 as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public | |
16 | * License along with this program; if not, write to the | |
17 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | * Boston, MA 021110-1307, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/ceph/ceph_debug.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/xattr.h> | |
25 | #include <linux/posix_acl_xattr.h> | |
26 | #include <linux/posix_acl.h> | |
27 | #include <linux/sched.h> | |
28 | #include <linux/slab.h> | |
29 | ||
30 | #include "super.h" | |
31 | ||
32 | static inline void ceph_set_cached_acl(struct inode *inode, | |
33 | int type, struct posix_acl *acl) | |
34 | { | |
35 | struct ceph_inode_info *ci = ceph_inode(inode); | |
36 | ||
37 | spin_lock(&ci->i_ceph_lock); | |
38 | if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)) | |
39 | set_cached_acl(inode, type, acl); | |
40 | spin_unlock(&ci->i_ceph_lock); | |
41 | } | |
42 | ||
43 | static inline struct posix_acl *ceph_get_cached_acl(struct inode *inode, | |
44 | int type) | |
45 | { | |
46 | struct ceph_inode_info *ci = ceph_inode(inode); | |
47 | struct posix_acl *acl = ACL_NOT_CACHED; | |
48 | ||
49 | spin_lock(&ci->i_ceph_lock); | |
50 | if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)) | |
51 | acl = get_cached_acl(inode, type); | |
52 | spin_unlock(&ci->i_ceph_lock); | |
53 | ||
54 | return acl; | |
55 | } | |
56 | ||
7221fe4c GZ |
57 | struct posix_acl *ceph_get_acl(struct inode *inode, int type) |
58 | { | |
59 | int size; | |
60 | const char *name; | |
61 | char *value = NULL; | |
62 | struct posix_acl *acl; | |
63 | ||
7221fe4c GZ |
64 | switch (type) { |
65 | case ACL_TYPE_ACCESS: | |
66 | name = POSIX_ACL_XATTR_ACCESS; | |
67 | break; | |
68 | case ACL_TYPE_DEFAULT: | |
69 | name = POSIX_ACL_XATTR_DEFAULT; | |
70 | break; | |
71 | default: | |
72 | BUG(); | |
73 | } | |
74 | ||
75 | size = __ceph_getxattr(inode, name, "", 0); | |
76 | if (size > 0) { | |
77 | value = kzalloc(size, GFP_NOFS); | |
78 | if (!value) | |
79 | return ERR_PTR(-ENOMEM); | |
80 | size = __ceph_getxattr(inode, name, value, size); | |
81 | } | |
82 | ||
83 | if (size > 0) | |
84 | acl = posix_acl_from_xattr(&init_user_ns, value, size); | |
85 | else if (size == -ERANGE || size == -ENODATA || size == 0) | |
86 | acl = NULL; | |
87 | else | |
88 | acl = ERR_PTR(-EIO); | |
89 | ||
90 | kfree(value); | |
91 | ||
92 | if (!IS_ERR(acl)) | |
93 | ceph_set_cached_acl(inode, type, acl); | |
94 | ||
95 | return acl; | |
96 | } | |
97 | ||
72466d0b | 98 | int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type) |
7221fe4c GZ |
99 | { |
100 | int ret = 0, size = 0; | |
101 | const char *name = NULL; | |
102 | char *value = NULL; | |
103 | struct iattr newattrs; | |
104 | umode_t new_mode = inode->i_mode, old_mode = inode->i_mode; | |
77516dc9 | 105 | struct dentry *dentry; |
7221fe4c GZ |
106 | |
107 | if (acl) { | |
108 | ret = posix_acl_valid(acl); | |
109 | if (ret < 0) | |
110 | goto out; | |
111 | } | |
112 | ||
113 | switch (type) { | |
114 | case ACL_TYPE_ACCESS: | |
115 | name = POSIX_ACL_XATTR_ACCESS; | |
116 | if (acl) { | |
117 | ret = posix_acl_equiv_mode(acl, &new_mode); | |
118 | if (ret < 0) | |
119 | goto out; | |
120 | if (ret == 0) | |
121 | acl = NULL; | |
122 | } | |
123 | break; | |
124 | case ACL_TYPE_DEFAULT: | |
125 | if (!S_ISDIR(inode->i_mode)) { | |
126 | ret = acl ? -EINVAL : 0; | |
127 | goto out; | |
128 | } | |
129 | name = POSIX_ACL_XATTR_DEFAULT; | |
130 | break; | |
131 | default: | |
132 | ret = -EINVAL; | |
133 | goto out; | |
134 | } | |
135 | ||
136 | if (acl) { | |
137 | size = posix_acl_xattr_size(acl->a_count); | |
138 | value = kmalloc(size, GFP_NOFS); | |
139 | if (!value) { | |
140 | ret = -ENOMEM; | |
141 | goto out; | |
142 | } | |
143 | ||
144 | ret = posix_acl_to_xattr(&init_user_ns, acl, value, size); | |
145 | if (ret < 0) | |
146 | goto out_free; | |
147 | } | |
148 | ||
77516dc9 | 149 | dentry = d_find_alias(inode); |
7221fe4c GZ |
150 | if (new_mode != old_mode) { |
151 | newattrs.ia_mode = new_mode; | |
152 | newattrs.ia_valid = ATTR_MODE; | |
153 | ret = ceph_setattr(dentry, &newattrs); | |
154 | if (ret) | |
77516dc9 | 155 | goto out_dput; |
7221fe4c GZ |
156 | } |
157 | ||
7a92d647 | 158 | ret = __ceph_setxattr(dentry, name, value, size, 0); |
7221fe4c GZ |
159 | if (ret) { |
160 | if (new_mode != old_mode) { | |
161 | newattrs.ia_mode = old_mode; | |
162 | newattrs.ia_valid = ATTR_MODE; | |
163 | ceph_setattr(dentry, &newattrs); | |
164 | } | |
77516dc9 | 165 | goto out_dput; |
7221fe4c GZ |
166 | } |
167 | ||
168 | ceph_set_cached_acl(inode, type, acl); | |
169 | ||
77516dc9 SW |
170 | out_dput: |
171 | dput(dentry); | |
7221fe4c GZ |
172 | out_free: |
173 | kfree(value); | |
174 | out: | |
175 | return ret; | |
176 | } | |
177 | ||
178 | int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir) | |
179 | { | |
75858236 CH |
180 | struct posix_acl *default_acl, *acl; |
181 | int error; | |
7221fe4c | 182 | |
75858236 CH |
183 | error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); |
184 | if (error) | |
185 | return error; | |
7221fe4c | 186 | |
75858236 | 187 | if (!default_acl && !acl) |
7221fe4c | 188 | cache_no_acl(inode); |
7221fe4c | 189 | |
75858236 CH |
190 | if (default_acl) { |
191 | error = ceph_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); | |
192 | posix_acl_release(default_acl); | |
193 | } | |
194 | if (acl) { | |
195 | if (!error) | |
196 | error = ceph_set_acl(inode, acl, ACL_TYPE_ACCESS); | |
197 | posix_acl_release(acl); | |
198 | } | |
199 | return error; | |
7221fe4c | 200 | } |