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Linux/fs/9p/acl.c

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  1 /*
  2  * Copyright IBM Corporation, 2010
  3  * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify it
  6  * under the terms of version 2.1 of the GNU Lesser General Public License
  7  * as published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it would be useful, but
 10  * WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 12  *
 13  */
 14 
 15 #include <linux/module.h>
 16 #include <linux/fs.h>
 17 #include <net/9p/9p.h>
 18 #include <net/9p/client.h>
 19 #include <linux/slab.h>
 20 #include <linux/sched.h>
 21 #include <linux/posix_acl_xattr.h>
 22 #include "xattr.h"
 23 #include "acl.h"
 24 #include "v9fs.h"
 25 #include "v9fs_vfs.h"
 26 #include "fid.h"
 27 
 28 static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name)
 29 {
 30         ssize_t size;
 31         void *value = NULL;
 32         struct posix_acl *acl = NULL;
 33 
 34         size = v9fs_fid_xattr_get(fid, name, NULL, 0);
 35         if (size > 0) {
 36                 value = kzalloc(size, GFP_NOFS);
 37                 if (!value)
 38                         return ERR_PTR(-ENOMEM);
 39                 size = v9fs_fid_xattr_get(fid, name, value, size);
 40                 if (size > 0) {
 41                         acl = posix_acl_from_xattr(&init_user_ns, value, size);
 42                         if (IS_ERR(acl))
 43                                 goto err_out;
 44                 }
 45         } else if (size == -ENODATA || size == 0 ||
 46                    size == -ENOSYS || size == -EOPNOTSUPP) {
 47                 acl = NULL;
 48         } else
 49                 acl = ERR_PTR(-EIO);
 50 
 51 err_out:
 52         kfree(value);
 53         return acl;
 54 }
 55 
 56 int v9fs_get_acl(struct inode *inode, struct p9_fid *fid)
 57 {
 58         int retval = 0;
 59         struct posix_acl *pacl, *dacl;
 60         struct v9fs_session_info *v9ses;
 61 
 62         v9ses = v9fs_inode2v9ses(inode);
 63         if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
 64                         ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
 65                 set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL);
 66                 set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
 67                 return 0;
 68         }
 69         /* get the default/access acl values and cache them */
 70         dacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_DEFAULT);
 71         pacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_ACCESS);
 72 
 73         if (!IS_ERR(dacl) && !IS_ERR(pacl)) {
 74                 set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
 75                 set_cached_acl(inode, ACL_TYPE_ACCESS, pacl);
 76         } else
 77                 retval = -EIO;
 78 
 79         if (!IS_ERR(dacl))
 80                 posix_acl_release(dacl);
 81 
 82         if (!IS_ERR(pacl))
 83                 posix_acl_release(pacl);
 84 
 85         return retval;
 86 }
 87 
 88 static struct posix_acl *v9fs_get_cached_acl(struct inode *inode, int type)
 89 {
 90         struct posix_acl *acl;
 91         /*
 92          * 9p Always cache the acl value when
 93          * instantiating the inode (v9fs_inode_from_fid)
 94          */
 95         acl = get_cached_acl(inode, type);
 96         BUG_ON(acl == ACL_NOT_CACHED);
 97         return acl;
 98 }
 99 
100 struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type)
101 {
102         struct v9fs_session_info *v9ses;
103 
104         v9ses = v9fs_inode2v9ses(inode);
105         if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
106                         ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
107                 /*
108                  * On access = client  and acl = on mode get the acl
109                  * values from the server
110                  */
111                 return NULL;
112         }
113         return v9fs_get_cached_acl(inode, type);
114 
115 }
116 
117 static int v9fs_set_acl(struct p9_fid *fid, int type, struct posix_acl *acl)
118 {
119         int retval;
120         char *name;
121         size_t size;
122         void *buffer;
123         if (!acl)
124                 return 0;
125 
126         /* Set a setxattr request to server */
127         size = posix_acl_xattr_size(acl->a_count);
128         buffer = kmalloc(size, GFP_KERNEL);
129         if (!buffer)
130                 return -ENOMEM;
131         retval = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
132         if (retval < 0)
133                 goto err_free_out;
134         switch (type) {
135         case ACL_TYPE_ACCESS:
136                 name = POSIX_ACL_XATTR_ACCESS;
137                 break;
138         case ACL_TYPE_DEFAULT:
139                 name = POSIX_ACL_XATTR_DEFAULT;
140                 break;
141         default:
142                 BUG();
143         }
144         retval = v9fs_fid_xattr_set(fid, name, buffer, size, 0);
145 err_free_out:
146         kfree(buffer);
147         return retval;
148 }
149 
150 int v9fs_acl_chmod(struct inode *inode, struct p9_fid *fid)
151 {
152         int retval = 0;
153         struct posix_acl *acl;
154 
155         if (S_ISLNK(inode->i_mode))
156                 return -EOPNOTSUPP;
157         acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
158         if (acl) {
159                 retval = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
160                 if (retval)
161                         return retval;
162                 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
163                 retval = v9fs_set_acl(fid, ACL_TYPE_ACCESS, acl);
164                 posix_acl_release(acl);
165         }
166         return retval;
167 }
168 
169 int v9fs_set_create_acl(struct inode *inode, struct p9_fid *fid,
170                         struct posix_acl *dacl, struct posix_acl *acl)
171 {
172         set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
173         set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
174         v9fs_set_acl(fid, ACL_TYPE_DEFAULT, dacl);
175         v9fs_set_acl(fid, ACL_TYPE_ACCESS, acl);
176         return 0;
177 }
178 
179 void v9fs_put_acl(struct posix_acl *dacl,
180                   struct posix_acl *acl)
181 {
182         posix_acl_release(dacl);
183         posix_acl_release(acl);
184 }
185 
186 int v9fs_acl_mode(struct inode *dir, umode_t *modep,
187                   struct posix_acl **dpacl, struct posix_acl **pacl)
188 {
189         int retval = 0;
190         umode_t mode = *modep;
191         struct posix_acl *acl = NULL;
192 
193         if (!S_ISLNK(mode)) {
194                 acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
195                 if (IS_ERR(acl))
196                         return PTR_ERR(acl);
197                 if (!acl)
198                         mode &= ~current_umask();
199         }
200         if (acl) {
201                 if (S_ISDIR(mode))
202                         *dpacl = posix_acl_dup(acl);
203                 retval = __posix_acl_create(&acl, GFP_NOFS, &mode);
204                 if (retval < 0)
205                         return retval;
206                 if (retval > 0)
207                         *pacl = acl;
208                 else
209                         posix_acl_release(acl);
210         }
211         *modep  = mode;
212         return 0;
213 }
214 
215 static int v9fs_remote_get_acl(struct dentry *dentry, const char *name,
216                                void *buffer, size_t size, int type)
217 {
218         char *full_name;
219 
220         switch (type) {
221         case ACL_TYPE_ACCESS:
222                 full_name =  POSIX_ACL_XATTR_ACCESS;
223                 break;
224         case ACL_TYPE_DEFAULT:
225                 full_name = POSIX_ACL_XATTR_DEFAULT;
226                 break;
227         default:
228                 BUG();
229         }
230         return v9fs_xattr_get(dentry, full_name, buffer, size);
231 }
232 
233 static int v9fs_xattr_get_acl(struct dentry *dentry, const char *name,
234                               void *buffer, size_t size, int type)
235 {
236         struct v9fs_session_info *v9ses;
237         struct posix_acl *acl;
238         int error;
239 
240         if (strcmp(name, "") != 0)
241                 return -EINVAL;
242 
243         v9ses = v9fs_dentry2v9ses(dentry);
244         /*
245          * We allow set/get/list of acl when access=client is not specified
246          */
247         if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
248                 return v9fs_remote_get_acl(dentry, name, buffer, size, type);
249 
250         acl = v9fs_get_cached_acl(dentry->d_inode, type);
251         if (IS_ERR(acl))
252                 return PTR_ERR(acl);
253         if (acl == NULL)
254                 return -ENODATA;
255         error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
256         posix_acl_release(acl);
257 
258         return error;
259 }
260 
261 static int v9fs_remote_set_acl(struct dentry *dentry, const char *name,
262                               const void *value, size_t size,
263                               int flags, int type)
264 {
265         char *full_name;
266 
267         switch (type) {
268         case ACL_TYPE_ACCESS:
269                 full_name =  POSIX_ACL_XATTR_ACCESS;
270                 break;
271         case ACL_TYPE_DEFAULT:
272                 full_name = POSIX_ACL_XATTR_DEFAULT;
273                 break;
274         default:
275                 BUG();
276         }
277         return v9fs_xattr_set(dentry, full_name, value, size, flags);
278 }
279 
280 
281 static int v9fs_xattr_set_acl(struct dentry *dentry, const char *name,
282                               const void *value, size_t size,
283                               int flags, int type)
284 {
285         int retval;
286         struct posix_acl *acl;
287         struct v9fs_session_info *v9ses;
288         struct inode *inode = dentry->d_inode;
289 
290         if (strcmp(name, "") != 0)
291                 return -EINVAL;
292 
293         v9ses = v9fs_dentry2v9ses(dentry);
294         /*
295          * set the attribute on the remote. Without even looking at the
296          * xattr value. We leave it to the server to validate
297          */
298         if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
299                 return v9fs_remote_set_acl(dentry, name,
300                                            value, size, flags, type);
301 
302         if (S_ISLNK(inode->i_mode))
303                 return -EOPNOTSUPP;
304         if (!inode_owner_or_capable(inode))
305                 return -EPERM;
306         if (value) {
307                 /* update the cached acl value */
308                 acl = posix_acl_from_xattr(&init_user_ns, value, size);
309                 if (IS_ERR(acl))
310                         return PTR_ERR(acl);
311                 else if (acl) {
312                         retval = posix_acl_valid(acl);
313                         if (retval)
314                                 goto err_out;
315                 }
316         } else
317                 acl = NULL;
318 
319         switch (type) {
320         case ACL_TYPE_ACCESS:
321                 name = POSIX_ACL_XATTR_ACCESS;
322                 if (acl) {
323                         struct iattr iattr;
324                         struct posix_acl *old_acl = acl;
325 
326                         retval = posix_acl_update_mode(inode, &iattr.ia_mode, &acl);
327                         if (retval)
328                                 goto err_out;
329                         if (!acl) {
330                                 /*
331                                  * ACL can be represented
332                                  * by the mode bits. So don't
333                                  * update ACL.
334                                  */
335                                 posix_acl_release(old_acl);
336                                 value = NULL;
337                                 size = 0;
338                         }
339                         iattr.ia_valid = ATTR_MODE;
340                         /* FIXME should we update ctime ?
341                          * What is the following setxattr update the
342                          * mode ?
343                          */
344                         v9fs_vfs_setattr_dotl(dentry, &iattr);
345                 }
346                 break;
347         case ACL_TYPE_DEFAULT:
348                 name = POSIX_ACL_XATTR_DEFAULT;
349                 if (!S_ISDIR(inode->i_mode)) {
350                         retval = acl ? -EINVAL : 0;
351                         goto err_out;
352                 }
353                 break;
354         default:
355                 BUG();
356         }
357         retval = v9fs_xattr_set(dentry, name, value, size, flags);
358         if (!retval)
359                 set_cached_acl(inode, type, acl);
360 err_out:
361         posix_acl_release(acl);
362         return retval;
363 }
364 
365 const struct xattr_handler v9fs_xattr_acl_access_handler = {
366         .prefix = POSIX_ACL_XATTR_ACCESS,
367         .flags  = ACL_TYPE_ACCESS,
368         .get    = v9fs_xattr_get_acl,
369         .set    = v9fs_xattr_set_acl,
370 };
371 
372 const struct xattr_handler v9fs_xattr_acl_default_handler = {
373         .prefix = POSIX_ACL_XATTR_DEFAULT,
374         .flags  = ACL_TYPE_DEFAULT,
375         .get    = v9fs_xattr_get_acl,
376         .set    = v9fs_xattr_set_acl,
377 };
378 

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