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Linux/fs/ocfs2/acl.c

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * acl.c
  5  *
  6  * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
  7  *
  8  * CREDITS:
  9  * Lots of code in this file is copy from linux/fs/ext3/acl.c.
 10  * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
 11  *
 12  * This program is free software; you can redistribute it and/or
 13  * modify it under the terms of the GNU General Public
 14  * License version 2 as published by the Free Software Foundation.
 15  *
 16  * This program is distributed in the hope that it will be useful,
 17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 19  * General Public License for more details.
 20  */
 21 
 22 #include <linux/init.h>
 23 #include <linux/module.h>
 24 #include <linux/slab.h>
 25 #include <linux/string.h>
 26 
 27 #include <cluster/masklog.h>
 28 
 29 #include "ocfs2.h"
 30 #include "alloc.h"
 31 #include "dlmglue.h"
 32 #include "file.h"
 33 #include "inode.h"
 34 #include "journal.h"
 35 #include "ocfs2_fs.h"
 36 
 37 #include "xattr.h"
 38 #include "acl.h"
 39 
 40 /*
 41  * Convert from xattr value to acl struct.
 42  */
 43 static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size)
 44 {
 45         int n, count;
 46         struct posix_acl *acl;
 47 
 48         if (!value)
 49                 return NULL;
 50         if (size < sizeof(struct posix_acl_entry))
 51                 return ERR_PTR(-EINVAL);
 52 
 53         count = size / sizeof(struct posix_acl_entry);
 54 
 55         acl = posix_acl_alloc(count, GFP_NOFS);
 56         if (!acl)
 57                 return ERR_PTR(-ENOMEM);
 58         for (n = 0; n < count; n++) {
 59                 struct ocfs2_acl_entry *entry =
 60                         (struct ocfs2_acl_entry *)value;
 61 
 62                 acl->a_entries[n].e_tag  = le16_to_cpu(entry->e_tag);
 63                 acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
 64                 switch(acl->a_entries[n].e_tag) {
 65                 case ACL_USER:
 66                         acl->a_entries[n].e_uid =
 67                                 make_kuid(&init_user_ns,
 68                                           le32_to_cpu(entry->e_id));
 69                         break;
 70                 case ACL_GROUP:
 71                         acl->a_entries[n].e_gid =
 72                                 make_kgid(&init_user_ns,
 73                                           le32_to_cpu(entry->e_id));
 74                         break;
 75                 default:
 76                         break;
 77                 }
 78                 value += sizeof(struct posix_acl_entry);
 79 
 80         }
 81         return acl;
 82 }
 83 
 84 /*
 85  * Convert acl struct to xattr value.
 86  */
 87 static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
 88 {
 89         struct ocfs2_acl_entry *entry = NULL;
 90         char *ocfs2_acl;
 91         size_t n;
 92 
 93         *size = acl->a_count * sizeof(struct posix_acl_entry);
 94 
 95         ocfs2_acl = kmalloc(*size, GFP_NOFS);
 96         if (!ocfs2_acl)
 97                 return ERR_PTR(-ENOMEM);
 98 
 99         entry = (struct ocfs2_acl_entry *)ocfs2_acl;
100         for (n = 0; n < acl->a_count; n++, entry++) {
101                 entry->e_tag  = cpu_to_le16(acl->a_entries[n].e_tag);
102                 entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
103                 switch(acl->a_entries[n].e_tag) {
104                 case ACL_USER:
105                         entry->e_id = cpu_to_le32(
106                                 from_kuid(&init_user_ns,
107                                           acl->a_entries[n].e_uid));
108                         break;
109                 case ACL_GROUP:
110                         entry->e_id = cpu_to_le32(
111                                 from_kgid(&init_user_ns,
112                                           acl->a_entries[n].e_gid));
113                         break;
114                 default:
115                         entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
116                         break;
117                 }
118         }
119         return ocfs2_acl;
120 }
121 
122 static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
123                                               int type,
124                                               struct buffer_head *di_bh)
125 {
126         int name_index;
127         char *value = NULL;
128         struct posix_acl *acl;
129         int retval;
130 
131         switch (type) {
132         case ACL_TYPE_ACCESS:
133                 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
134                 break;
135         case ACL_TYPE_DEFAULT:
136                 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
137                 break;
138         default:
139                 return ERR_PTR(-EINVAL);
140         }
141 
142         retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
143         if (retval > 0) {
144                 value = kmalloc(retval, GFP_NOFS);
145                 if (!value)
146                         return ERR_PTR(-ENOMEM);
147                 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
148                                                 "", value, retval);
149         }
150 
151         if (retval > 0)
152                 acl = ocfs2_acl_from_xattr(value, retval);
153         else if (retval == -ENODATA || retval == 0)
154                 acl = NULL;
155         else
156                 acl = ERR_PTR(retval);
157 
158         kfree(value);
159 
160         return acl;
161 }
162 
163 /*
164  * Helper function to set i_mode in memory and disk. Some call paths
165  * will not have di_bh or a journal handle to pass, in which case it
166  * will create it's own.
167  */
168 static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
169                               handle_t *handle, umode_t new_mode)
170 {
171         int ret, commit_handle = 0;
172         struct ocfs2_dinode *di;
173 
174         if (di_bh == NULL) {
175                 ret = ocfs2_read_inode_block(inode, &di_bh);
176                 if (ret) {
177                         mlog_errno(ret);
178                         goto out;
179                 }
180         } else
181                 get_bh(di_bh);
182 
183         if (handle == NULL) {
184                 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
185                                            OCFS2_INODE_UPDATE_CREDITS);
186                 if (IS_ERR(handle)) {
187                         ret = PTR_ERR(handle);
188                         mlog_errno(ret);
189                         goto out_brelse;
190                 }
191 
192                 commit_handle = 1;
193         }
194 
195         di = (struct ocfs2_dinode *)di_bh->b_data;
196         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
197                                       OCFS2_JOURNAL_ACCESS_WRITE);
198         if (ret) {
199                 mlog_errno(ret);
200                 goto out_commit;
201         }
202 
203         inode->i_mode = new_mode;
204         inode->i_ctime = CURRENT_TIME;
205         di->i_mode = cpu_to_le16(inode->i_mode);
206         di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
207         di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
208         ocfs2_update_inode_fsync_trans(handle, inode, 0);
209 
210         ocfs2_journal_dirty(handle, di_bh);
211 
212 out_commit:
213         if (commit_handle)
214                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
215 out_brelse:
216         brelse(di_bh);
217 out:
218         return ret;
219 }
220 
221 /*
222  * Set the access or default ACL of an inode.
223  */
224 int ocfs2_set_acl(handle_t *handle,
225                          struct inode *inode,
226                          struct buffer_head *di_bh,
227                          int type,
228                          struct posix_acl *acl,
229                          struct ocfs2_alloc_context *meta_ac,
230                          struct ocfs2_alloc_context *data_ac)
231 {
232         int name_index;
233         void *value = NULL;
234         size_t size = 0;
235         int ret;
236 
237         if (S_ISLNK(inode->i_mode))
238                 return -EOPNOTSUPP;
239 
240         switch (type) {
241         case ACL_TYPE_ACCESS:
242                 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
243                 if (acl) {
244                         umode_t mode = inode->i_mode;
245                         ret = posix_acl_equiv_mode(acl, &mode);
246                         if (ret < 0)
247                                 return ret;
248                         else {
249                                 if (ret == 0)
250                                         acl = NULL;
251 
252                                 ret = ocfs2_acl_set_mode(inode, di_bh,
253                                                          handle, mode);
254                                 if (ret)
255                                         return ret;
256 
257                         }
258                 }
259                 break;
260         case ACL_TYPE_DEFAULT:
261                 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
262                 if (!S_ISDIR(inode->i_mode))
263                         return acl ? -EACCES : 0;
264                 break;
265         default:
266                 return -EINVAL;
267         }
268 
269         if (acl) {
270                 value = ocfs2_acl_to_xattr(acl, &size);
271                 if (IS_ERR(value))
272                         return (int)PTR_ERR(value);
273         }
274 
275         if (handle)
276                 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
277                                              "", value, size, 0,
278                                              meta_ac, data_ac);
279         else
280                 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
281 
282         kfree(value);
283 
284         return ret;
285 }
286 
287 int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type)
288 {
289         return ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
290 }
291 
292 struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
293 {
294         struct ocfs2_super *osb;
295         struct buffer_head *di_bh = NULL;
296         struct posix_acl *acl;
297         int ret = -EAGAIN;
298 
299         osb = OCFS2_SB(inode->i_sb);
300         if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
301                 return NULL;
302 
303         ret = ocfs2_read_inode_block(inode, &di_bh);
304         if (ret < 0)
305                 return ERR_PTR(ret);
306 
307         acl = ocfs2_get_acl_nolock(inode, type, di_bh);
308 
309         brelse(di_bh);
310 
311         return acl;
312 }
313 

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