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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 inode *inode,
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 timespec64 old_ctime = inode->i_ctime;
96 umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
97
98 if (ceph_snap(inode) != CEPH_NOSNAP) {
99 ret = -EROFS;
100 goto out;
101 }
102
103 switch (type) {
104 case ACL_TYPE_ACCESS:
105 name = XATTR_NAME_POSIX_ACL_ACCESS;
106 if (acl) {
107 ret = posix_acl_update_mode(&init_user_ns, inode,
108 &new_mode, &acl);
109 if (ret)
110 goto out;
111 }
112 break;
113 case ACL_TYPE_DEFAULT:
114 if (!S_ISDIR(inode->i_mode)) {
115 ret = acl ? -EINVAL : 0;
116 goto out;
117 }
118 name = XATTR_NAME_POSIX_ACL_DEFAULT;
119 break;
120 default:
121 ret = -EINVAL;
122 goto out;
123 }
124
125 if (acl) {
126 size = posix_acl_xattr_size(acl->a_count);
127 value = kmalloc(size, GFP_NOFS);
128 if (!value) {
129 ret = -ENOMEM;
130 goto out;
131 }
132
133 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
134 if (ret < 0)
135 goto out_free;
136 }
137
138 if (new_mode != old_mode) {
139 newattrs.ia_ctime = current_time(inode);
140 newattrs.ia_mode = new_mode;
141 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
142 ret = __ceph_setattr(inode, &newattrs);
143 if (ret)
144 goto out_free;
145 }
146
147 ret = __ceph_setxattr(inode, name, value, size, 0);
148 if (ret) {
149 if (new_mode != old_mode) {
150 newattrs.ia_ctime = old_ctime;
151 newattrs.ia_mode = old_mode;
152 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
153 __ceph_setattr(inode, &newattrs);
154 }
155 goto out_free;
156 }
157
158 ceph_set_cached_acl(inode, type, acl);
159
160out_free:
161 kfree(value);
162out:
163 return ret;
164}
165
166int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
167 struct ceph_acl_sec_ctx *as_ctx)
168{
169 struct posix_acl *acl, *default_acl;
170 size_t val_size1 = 0, val_size2 = 0;
171 struct ceph_pagelist *pagelist = NULL;
172 void *tmp_buf = NULL;
173 int err;
174
175 err = posix_acl_create(dir, mode, &default_acl, &acl);
176 if (err)
177 return err;
178
179 if (acl) {
180 err = posix_acl_equiv_mode(acl, mode);
181 if (err < 0)
182 goto out_err;
183 if (err == 0) {
184 posix_acl_release(acl);
185 acl = NULL;
186 }
187 }
188
189 if (!default_acl && !acl)
190 return 0;
191
192 if (acl)
193 val_size1 = posix_acl_xattr_size(acl->a_count);
194 if (default_acl)
195 val_size2 = posix_acl_xattr_size(default_acl->a_count);
196
197 err = -ENOMEM;
198 tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
199 if (!tmp_buf)
200 goto out_err;
201 pagelist = ceph_pagelist_alloc(GFP_KERNEL);
202 if (!pagelist)
203 goto out_err;
204
205 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
206 if (err)
207 goto out_err;
208
209 ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
210
211 if (acl) {
212 size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
213 err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
214 if (err)
215 goto out_err;
216 ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
217 len);
218 err = posix_acl_to_xattr(&init_user_ns, acl,
219 tmp_buf, val_size1);
220 if (err < 0)
221 goto out_err;
222 ceph_pagelist_encode_32(pagelist, val_size1);
223 ceph_pagelist_append(pagelist, tmp_buf, val_size1);
224 }
225 if (default_acl) {
226 size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
227 err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
228 if (err)
229 goto out_err;
230 ceph_pagelist_encode_string(pagelist,
231 XATTR_NAME_POSIX_ACL_DEFAULT, len);
232 err = posix_acl_to_xattr(&init_user_ns, default_acl,
233 tmp_buf, val_size2);
234 if (err < 0)
235 goto out_err;
236 ceph_pagelist_encode_32(pagelist, val_size2);
237 ceph_pagelist_append(pagelist, tmp_buf, val_size2);
238 }
239
240 kfree(tmp_buf);
241
242 as_ctx->acl = acl;
243 as_ctx->default_acl = default_acl;
244 as_ctx->pagelist = pagelist;
245 return 0;
246
247out_err:
248 posix_acl_release(acl);
249 posix_acl_release(default_acl);
250 kfree(tmp_buf);
251 if (pagelist)
252 ceph_pagelist_release(pagelist);
253 return err;
254}
255
256void ceph_init_inode_acls(struct inode *inode, struct ceph_acl_sec_ctx *as_ctx)
257{
258 if (!inode)
259 return;
260 ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, as_ctx->acl);
261 ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, as_ctx->default_acl);
262}
263
