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Linux/fs/ceph/acl.c

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  1 /*
  2  * linux/fs/ceph/acl.c
  3  *
  4  * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public
  8  * License v2 as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 13  * General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public
 16  * License along with this program; if not, write to the
 17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 18  * Boston, MA 021110-1307, USA.
 19  */
 20 
 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 
 32 static 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 
 45 struct 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 
 64 retry:
 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 
 98 int 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 
168 out_free:
169         kfree(value);
170 out:
171         return ret;
172 }
173 
174 int 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 
255 out_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 
264 void 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 
272 void 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 

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