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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 else
41 forget_cached_acl(inode, type);
42 spin_unlock(&ci->i_ceph_lock);
43}
44
45struct posix_acl *ceph_get_acl(struct inode *inode, int type)
46{
47 int size;
48 unsigned int retry_cnt = 0;
49 const char *name;
50 char *value = NULL;
51 struct posix_acl *acl;
52
53 switch (type) {
54 case ACL_TYPE_ACCESS:
55 name = XATTR_NAME_POSIX_ACL_ACCESS;
56 break;
57 case ACL_TYPE_DEFAULT:
58 name = XATTR_NAME_POSIX_ACL_DEFAULT;
59 break;
60 default:
61 BUG();
62 }
63
64retry:
65 size = __ceph_getxattr(inode, name, "", 0);
66 if (size > 0) {
67 value = kzalloc(size, GFP_NOFS);
68 if (!value)
69 return ERR_PTR(-ENOMEM);
70 size = __ceph_getxattr(inode, name, value, size);
71 }
72
73 if (size == -ERANGE && retry_cnt < 10) {
74 retry_cnt++;
75 kfree(value);
76 value = NULL;
77 goto retry;
78 }
79
80 if (size > 0) {
81 acl = posix_acl_from_xattr(&init_user_ns, value, size);
82 } else if (size == -ENODATA || size == 0) {
83 acl = NULL;
84 } else {
85 pr_err_ratelimited("get acl %llx.%llx failed, err=%d\n",
86 ceph_vinop(inode), size);
87 acl = ERR_PTR(-EIO);
88 }
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 struct timespec64 old_ctime = inode->i_ctime;
105 umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
106
107 if (ceph_snap(inode) != CEPH_NOSNAP) {
108 ret = -EROFS;
109 goto out;
110 }
111
112 switch (type) {
113 case ACL_TYPE_ACCESS:
114 name = XATTR_NAME_POSIX_ACL_ACCESS;
115 if (acl) {
116 ret = posix_acl_update_mode(inode, &new_mode, &acl);
117 if (ret)
118 goto out;
119 }
120 break;
121 case ACL_TYPE_DEFAULT:
122 if (!S_ISDIR(inode->i_mode)) {
123 ret = acl ? -EINVAL : 0;
124 goto out;
125 }
126 name = XATTR_NAME_POSIX_ACL_DEFAULT;
127 break;
128 default:
129 ret = -EINVAL;
130 goto out;
131 }
132
133 if (acl) {
134 size = posix_acl_xattr_size(acl->a_count);
135 value = kmalloc(size, GFP_NOFS);
136 if (!value) {
137 ret = -ENOMEM;
138 goto out;
139 }
140
141 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
142 if (ret < 0)
143 goto out_free;
144 }
145
146 if (new_mode != old_mode) {
147 newattrs.ia_ctime = current_time(inode);
148 newattrs.ia_mode = new_mode;
149 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
150 ret = __ceph_setattr(inode, &newattrs);
151 if (ret)
152 goto out_free;
153 }
154
155 ret = __ceph_setxattr(inode, name, value, size, 0);
156 if (ret) {
157 if (new_mode != old_mode) {
158 newattrs.ia_ctime = old_ctime;
159 newattrs.ia_mode = old_mode;
160 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
161 __ceph_setattr(inode, &newattrs);
162 }
163 goto out_free;
164 }
165
166 ceph_set_cached_acl(inode, type, acl);
167
168out_free:
169 kfree(value);
170out:
171 return ret;
172}
173
174int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
175 struct ceph_acls_info *info)
176{
177 struct posix_acl *acl, *default_acl;
178 size_t val_size1 = 0, val_size2 = 0;
179 struct ceph_pagelist *pagelist = NULL;
180 void *tmp_buf = NULL;
181 int err;
182
183 err = posix_acl_create(dir, mode, &default_acl, &acl);
184 if (err)
185 return err;
186
187 if (acl) {
188 err = posix_acl_equiv_mode(acl, mode);
189 if (err < 0)
190 goto out_err;
191 if (err == 0) {
192 posix_acl_release(acl);
193 acl = NULL;
194 }
195 }
196
197 if (!default_acl && !acl)
198 return 0;
199
200 if (acl)
201 val_size1 = posix_acl_xattr_size(acl->a_count);
202 if (default_acl)
203 val_size2 = posix_acl_xattr_size(default_acl->a_count);
204
205 err = -ENOMEM;
206 tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
207 if (!tmp_buf)
208 goto out_err;
209 pagelist = ceph_pagelist_alloc(GFP_KERNEL);
210 if (!pagelist)
211 goto out_err;
212
213 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
214 if (err)
215 goto out_err;
216
217 ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
218
219 if (acl) {
220 size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
221 err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
222 if (err)
223 goto out_err;
224 ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
225 len);
226 err = posix_acl_to_xattr(&init_user_ns, acl,
227 tmp_buf, val_size1);
228 if (err < 0)
229 goto out_err;
230 ceph_pagelist_encode_32(pagelist, val_size1);
231 ceph_pagelist_append(pagelist, tmp_buf, val_size1);
232 }
233 if (default_acl) {
234 size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
235 err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
236 if (err)
237 goto out_err;
238 err = ceph_pagelist_encode_string(pagelist,
239 XATTR_NAME_POSIX_ACL_DEFAULT, len);
240 err = posix_acl_to_xattr(&init_user_ns, default_acl,
241 tmp_buf, val_size2);
242 if (err < 0)
243 goto out_err;
244 ceph_pagelist_encode_32(pagelist, val_size2);
245 ceph_pagelist_append(pagelist, tmp_buf, val_size2);
246 }
247
248 kfree(tmp_buf);
249
250 info->acl = acl;
251 info->default_acl = default_acl;
252 info->pagelist = pagelist;
253 return 0;
254
255out_err:
256 posix_acl_release(acl);
257 posix_acl_release(default_acl);
258 kfree(tmp_buf);
259 if (pagelist)
260 ceph_pagelist_release(pagelist);
261 return err;
262}
263
264void ceph_init_inode_acls(struct inode* inode, struct ceph_acls_info *info)
265{
266 if (!inode)
267 return;
268 ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, info->acl);
269 ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, info->default_acl);
270}
271
272void ceph_release_acls_info(struct ceph_acls_info *info)
273{
274 posix_acl_release(info->acl);
275 posix_acl_release(info->default_acl);
276 if (info->pagelist)
277 ceph_pagelist_release(info->pagelist);
278}
279
