Loading...
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
32static 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
43static 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
57struct 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
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
98int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
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;
105 struct dentry *dentry;
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
149 dentry = d_find_alias(inode);
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)
155 goto out_dput;
156 }
157
158 ret = __ceph_setxattr(dentry, name, value, size, 0);
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 }
165 goto out_dput;
166 }
167
168 ceph_set_cached_acl(inode, type, acl);
169
170out_dput:
171 dput(dentry);
172out_free:
173 kfree(value);
174out:
175 return ret;
176}
177
178int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir)
179{
180 struct posix_acl *default_acl, *acl;
181 int error;
182
183 error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
184 if (error)
185 return error;
186
187 if (!default_acl && !acl)
188 cache_no_acl(inode);
189
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;
200}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/ceph/acl.c
4 *
5 * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
6 */
7
8#include <linux/ceph/ceph_debug.h>
9#include <linux/fs.h>
10#include <linux/string.h>
11#include <linux/xattr.h>
12#include <linux/posix_acl_xattr.h>
13#include <linux/posix_acl.h>
14#include <linux/sched.h>
15#include <linux/slab.h>
16
17#include "super.h"
18
19static inline void ceph_set_cached_acl(struct inode *inode,
20 int type, struct posix_acl *acl)
21{
22 struct ceph_inode_info *ci = ceph_inode(inode);
23
24 spin_lock(&ci->i_ceph_lock);
25 if (__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 0))
26 set_cached_acl(inode, type, acl);
27 else
28 forget_cached_acl(inode, type);
29 spin_unlock(&ci->i_ceph_lock);
30}
31
32struct posix_acl *ceph_get_acl(struct inode *inode, int type, bool rcu)
33{
34 int size;
35 unsigned int retry_cnt = 0;
36 const char *name;
37 char *value = NULL;
38 struct posix_acl *acl;
39
40 if (rcu)
41 return ERR_PTR(-ECHILD);
42
43 switch (type) {
44 case ACL_TYPE_ACCESS:
45 name = XATTR_NAME_POSIX_ACL_ACCESS;
46 break;
47 case ACL_TYPE_DEFAULT:
48 name = XATTR_NAME_POSIX_ACL_DEFAULT;
49 break;
50 default:
51 BUG();
52 }
53
54retry:
55 size = __ceph_getxattr(inode, name, "", 0);
56 if (size > 0) {
57 value = kzalloc(size, GFP_NOFS);
58 if (!value)
59 return ERR_PTR(-ENOMEM);
60 size = __ceph_getxattr(inode, name, value, size);
61 }
62
63 if (size == -ERANGE && retry_cnt < 10) {
64 retry_cnt++;
65 kfree(value);
66 value = NULL;
67 goto retry;
68 }
69
70 if (size > 0) {
71 acl = posix_acl_from_xattr(&init_user_ns, value, size);
72 } else if (size == -ENODATA || size == 0) {
73 acl = NULL;
74 } else {
75 pr_err_ratelimited("get acl %llx.%llx failed, err=%d\n",
76 ceph_vinop(inode), size);
77 acl = ERR_PTR(-EIO);
78 }
79
80 kfree(value);
81
82 if (!IS_ERR(acl))
83 ceph_set_cached_acl(inode, type, acl);
84
85 return acl;
86}
87
88int ceph_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry,
89 struct posix_acl *acl, int type)
90{
91 int ret = 0, size = 0;
92 const char *name = NULL;
93 char *value = NULL;
94 struct iattr newattrs;
95 struct inode *inode = d_inode(dentry);
96 struct timespec64 old_ctime = inode->i_ctime;
97 umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
98
99 if (ceph_snap(inode) != CEPH_NOSNAP) {
100 ret = -EROFS;
101 goto out;
102 }
103
104 switch (type) {
105 case ACL_TYPE_ACCESS:
106 name = XATTR_NAME_POSIX_ACL_ACCESS;
107 if (acl) {
108 ret = posix_acl_update_mode(&init_user_ns, inode,
109 &new_mode, &acl);
110 if (ret)
111 goto out;
112 }
113 break;
114 case ACL_TYPE_DEFAULT:
115 if (!S_ISDIR(inode->i_mode)) {
116 ret = acl ? -EINVAL : 0;
117 goto out;
118 }
119 name = XATTR_NAME_POSIX_ACL_DEFAULT;
120 break;
121 default:
122 ret = -EINVAL;
123 goto out;
124 }
125
126 if (acl) {
127 size = posix_acl_xattr_size(acl->a_count);
128 value = kmalloc(size, GFP_NOFS);
129 if (!value) {
130 ret = -ENOMEM;
131 goto out;
132 }
133
134 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
135 if (ret < 0)
136 goto out_free;
137 }
138
139 if (new_mode != old_mode) {
140 newattrs.ia_ctime = current_time(inode);
141 newattrs.ia_mode = new_mode;
142 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
143 ret = __ceph_setattr(inode, &newattrs);
144 if (ret)
145 goto out_free;
146 }
147
148 ret = __ceph_setxattr(inode, name, value, size, 0);
149 if (ret) {
150 if (new_mode != old_mode) {
151 newattrs.ia_ctime = old_ctime;
152 newattrs.ia_mode = old_mode;
153 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
154 __ceph_setattr(inode, &newattrs);
155 }
156 goto out_free;
157 }
158
159 ceph_set_cached_acl(inode, type, acl);
160
161out_free:
162 kfree(value);
163out:
164 return ret;
165}
166
167int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
168 struct ceph_acl_sec_ctx *as_ctx)
169{
170 struct posix_acl *acl, *default_acl;
171 size_t val_size1 = 0, val_size2 = 0;
172 struct ceph_pagelist *pagelist = NULL;
173 void *tmp_buf = NULL;
174 int err;
175
176 err = posix_acl_create(dir, mode, &default_acl, &acl);
177 if (err)
178 return err;
179
180 if (acl) {
181 err = posix_acl_equiv_mode(acl, mode);
182 if (err < 0)
183 goto out_err;
184 if (err == 0) {
185 posix_acl_release(acl);
186 acl = NULL;
187 }
188 }
189
190 if (!default_acl && !acl)
191 return 0;
192
193 if (acl)
194 val_size1 = posix_acl_xattr_size(acl->a_count);
195 if (default_acl)
196 val_size2 = posix_acl_xattr_size(default_acl->a_count);
197
198 err = -ENOMEM;
199 tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
200 if (!tmp_buf)
201 goto out_err;
202 pagelist = ceph_pagelist_alloc(GFP_KERNEL);
203 if (!pagelist)
204 goto out_err;
205
206 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
207 if (err)
208 goto out_err;
209
210 ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
211
212 if (acl) {
213 size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
214 err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
215 if (err)
216 goto out_err;
217 ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
218 len);
219 err = posix_acl_to_xattr(&init_user_ns, acl,
220 tmp_buf, val_size1);
221 if (err < 0)
222 goto out_err;
223 ceph_pagelist_encode_32(pagelist, val_size1);
224 ceph_pagelist_append(pagelist, tmp_buf, val_size1);
225 }
226 if (default_acl) {
227 size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
228 err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
229 if (err)
230 goto out_err;
231 ceph_pagelist_encode_string(pagelist,
232 XATTR_NAME_POSIX_ACL_DEFAULT, len);
233 err = posix_acl_to_xattr(&init_user_ns, default_acl,
234 tmp_buf, val_size2);
235 if (err < 0)
236 goto out_err;
237 ceph_pagelist_encode_32(pagelist, val_size2);
238 ceph_pagelist_append(pagelist, tmp_buf, val_size2);
239 }
240
241 kfree(tmp_buf);
242
243 as_ctx->acl = acl;
244 as_ctx->default_acl = default_acl;
245 as_ctx->pagelist = pagelist;
246 return 0;
247
248out_err:
249 posix_acl_release(acl);
250 posix_acl_release(default_acl);
251 kfree(tmp_buf);
252 if (pagelist)
253 ceph_pagelist_release(pagelist);
254 return err;
255}
256
257void ceph_init_inode_acls(struct inode *inode, struct ceph_acl_sec_ctx *as_ctx)
258{
259 if (!inode)
260 return;
261 ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, as_ctx->acl);
262 ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, as_ctx->default_acl);
263}