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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 const char *name;
49 char *value = NULL;
50 struct posix_acl *acl;
51
52 switch (type) {
53 case ACL_TYPE_ACCESS:
54 name = XATTR_NAME_POSIX_ACL_ACCESS;
55 break;
56 case ACL_TYPE_DEFAULT:
57 name = XATTR_NAME_POSIX_ACL_DEFAULT;
58 break;
59 default:
60 BUG();
61 }
62
63 size = __ceph_getxattr(inode, name, "", 0);
64 if (size > 0) {
65 value = kzalloc(size, GFP_NOFS);
66 if (!value)
67 return ERR_PTR(-ENOMEM);
68 size = __ceph_getxattr(inode, name, value, size);
69 }
70
71 if (size > 0)
72 acl = posix_acl_from_xattr(&init_user_ns, value, size);
73 else if (size == -ERANGE || size == -ENODATA || size == 0)
74 acl = NULL;
75 else
76 acl = ERR_PTR(-EIO);
77
78 kfree(value);
79
80 if (!IS_ERR(acl))
81 ceph_set_cached_acl(inode, type, acl);
82
83 return acl;
84}
85
86int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
87{
88 int ret = 0, size = 0;
89 const char *name = NULL;
90 char *value = NULL;
91 struct iattr newattrs;
92 umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
93
94 switch (type) {
95 case ACL_TYPE_ACCESS:
96 name = XATTR_NAME_POSIX_ACL_ACCESS;
97 if (acl) {
98 ret = posix_acl_update_mode(inode, &new_mode, &acl);
99 if (ret)
100 goto out;
101 }
102 break;
103 case ACL_TYPE_DEFAULT:
104 if (!S_ISDIR(inode->i_mode)) {
105 ret = acl ? -EINVAL : 0;
106 goto out;
107 }
108 name = XATTR_NAME_POSIX_ACL_DEFAULT;
109 break;
110 default:
111 ret = -EINVAL;
112 goto out;
113 }
114
115 if (acl) {
116 size = posix_acl_xattr_size(acl->a_count);
117 value = kmalloc(size, GFP_NOFS);
118 if (!value) {
119 ret = -ENOMEM;
120 goto out;
121 }
122
123 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
124 if (ret < 0)
125 goto out_free;
126 }
127
128 if (ceph_snap(inode) != CEPH_NOSNAP) {
129 ret = -EROFS;
130 goto out_free;
131 }
132
133 if (new_mode != old_mode) {
134 newattrs.ia_ctime = current_time(inode);
135 newattrs.ia_mode = new_mode;
136 newattrs.ia_valid = ATTR_MODE;
137 ret = __ceph_setattr(inode, &newattrs);
138 if (ret)
139 goto out_free;
140 }
141
142 ret = __ceph_setxattr(inode, name, value, size, 0);
143 if (ret) {
144 if (new_mode != old_mode) {
145 newattrs.ia_mode = old_mode;
146 newattrs.ia_valid = ATTR_MODE;
147 __ceph_setattr(inode, &newattrs);
148 }
149 goto out_free;
150 }
151
152 ceph_set_cached_acl(inode, type, acl);
153
154out_free:
155 kfree(value);
156out:
157 return ret;
158}
159
160int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
161 struct ceph_acls_info *info)
162{
163 struct posix_acl *acl, *default_acl;
164 size_t val_size1 = 0, val_size2 = 0;
165 struct ceph_pagelist *pagelist = NULL;
166 void *tmp_buf = NULL;
167 int err;
168
169 err = posix_acl_create(dir, mode, &default_acl, &acl);
170 if (err)
171 return err;
172
173 if (acl) {
174 int ret = posix_acl_equiv_mode(acl, mode);
175 if (ret < 0)
176 goto out_err;
177 if (ret == 0) {
178 posix_acl_release(acl);
179 acl = NULL;
180 }
181 }
182
183 if (!default_acl && !acl)
184 return 0;
185
186 if (acl)
187 val_size1 = posix_acl_xattr_size(acl->a_count);
188 if (default_acl)
189 val_size2 = posix_acl_xattr_size(default_acl->a_count);
190
191 err = -ENOMEM;
192 tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
193 if (!tmp_buf)
194 goto out_err;
195 pagelist = kmalloc(sizeof(struct ceph_pagelist), GFP_KERNEL);
196 if (!pagelist)
197 goto out_err;
198 ceph_pagelist_init(pagelist);
199
200 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
201 if (err)
202 goto out_err;
203
204 ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
205
206 if (acl) {
207 size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
208 err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
209 if (err)
210 goto out_err;
211 ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
212 len);
213 err = posix_acl_to_xattr(&init_user_ns, acl,
214 tmp_buf, val_size1);
215 if (err < 0)
216 goto out_err;
217 ceph_pagelist_encode_32(pagelist, val_size1);
218 ceph_pagelist_append(pagelist, tmp_buf, val_size1);
219 }
220 if (default_acl) {
221 size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
222 err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
223 if (err)
224 goto out_err;
225 err = ceph_pagelist_encode_string(pagelist,
226 XATTR_NAME_POSIX_ACL_DEFAULT, len);
227 err = posix_acl_to_xattr(&init_user_ns, default_acl,
228 tmp_buf, val_size2);
229 if (err < 0)
230 goto out_err;
231 ceph_pagelist_encode_32(pagelist, val_size2);
232 ceph_pagelist_append(pagelist, tmp_buf, val_size2);
233 }
234
235 kfree(tmp_buf);
236
237 info->acl = acl;
238 info->default_acl = default_acl;
239 info->pagelist = pagelist;
240 return 0;
241
242out_err:
243 posix_acl_release(acl);
244 posix_acl_release(default_acl);
245 kfree(tmp_buf);
246 if (pagelist)
247 ceph_pagelist_release(pagelist);
248 return err;
249}
250
251void ceph_init_inode_acls(struct inode* inode, struct ceph_acls_info *info)
252{
253 if (!inode)
254 return;
255 ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, info->acl);
256 ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, info->default_acl);
257}
258
259void ceph_release_acls_info(struct ceph_acls_info *info)
260{
261 posix_acl_release(info->acl);
262 posix_acl_release(info->default_acl);
263 if (info->pagelist)
264 ceph_pagelist_release(info->pagelist);
265}
266
