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