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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 spin_unlock(&ci->i_ceph_lock);
41}
42
43struct posix_acl *ceph_get_acl(struct inode *inode, int type)
44{
45 int size;
46 const char *name;
47 char *value = NULL;
48 struct posix_acl *acl;
49
50 switch (type) {
51 case ACL_TYPE_ACCESS:
52 name = XATTR_NAME_POSIX_ACL_ACCESS;
53 break;
54 case ACL_TYPE_DEFAULT:
55 name = XATTR_NAME_POSIX_ACL_DEFAULT;
56 break;
57 default:
58 BUG();
59 }
60
61 size = __ceph_getxattr(inode, name, "", 0);
62 if (size > 0) {
63 value = kzalloc(size, GFP_NOFS);
64 if (!value)
65 return ERR_PTR(-ENOMEM);
66 size = __ceph_getxattr(inode, name, value, size);
67 }
68
69 if (size > 0)
70 acl = posix_acl_from_xattr(&init_user_ns, value, size);
71 else if (size == -ERANGE || size == -ENODATA || size == 0)
72 acl = NULL;
73 else
74 acl = ERR_PTR(-EIO);
75
76 kfree(value);
77
78 if (!IS_ERR(acl))
79 ceph_set_cached_acl(inode, type, acl);
80
81 return acl;
82}
83
84int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
85{
86 int ret = 0, size = 0;
87 const char *name = NULL;
88 char *value = NULL;
89 struct iattr newattrs;
90 umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
91 struct dentry *dentry;
92
93 switch (type) {
94 case ACL_TYPE_ACCESS:
95 name = XATTR_NAME_POSIX_ACL_ACCESS;
96 if (acl) {
97 ret = posix_acl_equiv_mode(acl, &new_mode);
98 if (ret < 0)
99 goto out;
100 if (ret == 0)
101 acl = NULL;
102 }
103 break;
104 case ACL_TYPE_DEFAULT:
105 if (!S_ISDIR(inode->i_mode)) {
106 ret = acl ? -EINVAL : 0;
107 goto out;
108 }
109 name = XATTR_NAME_POSIX_ACL_DEFAULT;
110 break;
111 default:
112 ret = -EINVAL;
113 goto out;
114 }
115
116 if (acl) {
117 size = posix_acl_xattr_size(acl->a_count);
118 value = kmalloc(size, GFP_NOFS);
119 if (!value) {
120 ret = -ENOMEM;
121 goto out;
122 }
123
124 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
125 if (ret < 0)
126 goto out_free;
127 }
128
129 dentry = d_find_alias(inode);
130 if (new_mode != old_mode) {
131 newattrs.ia_mode = new_mode;
132 newattrs.ia_valid = ATTR_MODE;
133 ret = ceph_setattr(dentry, &newattrs);
134 if (ret)
135 goto out_dput;
136 }
137
138 ret = __ceph_setxattr(dentry, 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(dentry, &newattrs);
144 }
145 goto out_dput;
146 }
147
148 ceph_set_cached_acl(inode, type, acl);
149
150out_dput:
151 dput(dentry);
152out_free:
153 kfree(value);
154out:
155 return ret;
156}
157
158int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
159 struct ceph_acls_info *info)
160{
161 struct posix_acl *acl, *default_acl;
162 size_t val_size1 = 0, val_size2 = 0;
163 struct ceph_pagelist *pagelist = NULL;
164 void *tmp_buf = NULL;
165 int err;
166
167 err = posix_acl_create(dir, mode, &default_acl, &acl);
168 if (err)
169 return err;
170
171 if (acl) {
172 int ret = posix_acl_equiv_mode(acl, mode);
173 if (ret < 0)
174 goto out_err;
175 if (ret == 0) {
176 posix_acl_release(acl);
177 acl = NULL;
178 }
179 }
180
181 if (!default_acl && !acl)
182 return 0;
183
184 if (acl)
185 val_size1 = posix_acl_xattr_size(acl->a_count);
186 if (default_acl)
187 val_size2 = posix_acl_xattr_size(default_acl->a_count);
188
189 err = -ENOMEM;
190 tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
191 if (!tmp_buf)
192 goto out_err;
193 pagelist = kmalloc(sizeof(struct ceph_pagelist), GFP_KERNEL);
194 if (!pagelist)
195 goto out_err;
196 ceph_pagelist_init(pagelist);
197
198 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
199 if (err)
200 goto out_err;
201
202 ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
203
204 if (acl) {
205 size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
206 err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
207 if (err)
208 goto out_err;
209 ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
210 len);
211 err = posix_acl_to_xattr(&init_user_ns, acl,
212 tmp_buf, val_size1);
213 if (err < 0)
214 goto out_err;
215 ceph_pagelist_encode_32(pagelist, val_size1);
216 ceph_pagelist_append(pagelist, tmp_buf, val_size1);
217 }
218 if (default_acl) {
219 size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
220 err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
221 if (err)
222 goto out_err;
223 err = ceph_pagelist_encode_string(pagelist,
224 XATTR_NAME_POSIX_ACL_DEFAULT, len);
225 err = posix_acl_to_xattr(&init_user_ns, default_acl,
226 tmp_buf, val_size2);
227 if (err < 0)
228 goto out_err;
229 ceph_pagelist_encode_32(pagelist, val_size2);
230 ceph_pagelist_append(pagelist, tmp_buf, val_size2);
231 }
232
233 kfree(tmp_buf);
234
235 info->acl = acl;
236 info->default_acl = default_acl;
237 info->pagelist = pagelist;
238 return 0;
239
240out_err:
241 posix_acl_release(acl);
242 posix_acl_release(default_acl);
243 kfree(tmp_buf);
244 if (pagelist)
245 ceph_pagelist_release(pagelist);
246 return err;
247}
248
249void ceph_init_inode_acls(struct inode* inode, struct ceph_acls_info *info)
250{
251 if (!inode)
252 return;
253 ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, info->acl);
254 ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, info->default_acl);
255}
256
257void ceph_release_acls_info(struct ceph_acls_info *info)
258{
259 posix_acl_release(info->acl);
260 posix_acl_release(info->default_acl);
261 if (info->pagelist)
262 ceph_pagelist_release(info->pagelist);
263}
264
