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TOMOYO Linux Cross Reference
Linux/fs/afs/inode.c

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  1 /*
  2  * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
  3  *
  4  * This software may be freely redistributed under the terms of the
  5  * GNU General Public License.
  6  *
  7  * You should have received a copy of the GNU General Public License
  8  * along with this program; if not, write to the Free Software
  9  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 10  *
 11  * Authors: David Woodhouse <dwmw2@infradead.org>
 12  *          David Howells <dhowells@redhat.com>
 13  *
 14  */
 15 
 16 #include <linux/kernel.h>
 17 #include <linux/module.h>
 18 #include <linux/init.h>
 19 #include <linux/fs.h>
 20 #include <linux/pagemap.h>
 21 #include <linux/sched.h>
 22 #include <linux/mount.h>
 23 #include <linux/namei.h>
 24 #include "internal.h"
 25 
 26 struct afs_iget_data {
 27         struct afs_fid          fid;
 28         struct afs_volume       *volume;        /* volume on which resides */
 29 };
 30 
 31 /*
 32  * map the AFS file status to the inode member variables
 33  */
 34 static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key)
 35 {
 36         struct inode *inode = AFS_VNODE_TO_I(vnode);
 37 
 38         _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
 39                vnode->status.type,
 40                vnode->status.nlink,
 41                (unsigned long long) vnode->status.size,
 42                vnode->status.data_version,
 43                vnode->status.mode);
 44 
 45         switch (vnode->status.type) {
 46         case AFS_FTYPE_FILE:
 47                 inode->i_mode   = S_IFREG | vnode->status.mode;
 48                 inode->i_op     = &afs_file_inode_operations;
 49                 inode->i_fop    = &afs_file_operations;
 50                 break;
 51         case AFS_FTYPE_DIR:
 52                 inode->i_mode   = S_IFDIR | vnode->status.mode;
 53                 inode->i_op     = &afs_dir_inode_operations;
 54                 inode->i_fop    = &afs_dir_file_operations;
 55                 break;
 56         case AFS_FTYPE_SYMLINK:
 57                 inode->i_mode   = S_IFLNK | vnode->status.mode;
 58                 inode->i_op     = &page_symlink_inode_operations;
 59                 inode_nohighmem(inode);
 60                 break;
 61         default:
 62                 printk("kAFS: AFS vnode with undefined type\n");
 63                 return -EBADMSG;
 64         }
 65 
 66 #ifdef CONFIG_AFS_FSCACHE
 67         if (vnode->status.size != inode->i_size)
 68                 fscache_attr_changed(vnode->cache);
 69 #endif
 70 
 71         set_nlink(inode, vnode->status.nlink);
 72         inode->i_uid            = vnode->status.owner;
 73         inode->i_gid            = GLOBAL_ROOT_GID;
 74         inode->i_size           = vnode->status.size;
 75         inode->i_ctime.tv_sec   = vnode->status.mtime_server;
 76         inode->i_ctime.tv_nsec  = 0;
 77         inode->i_atime          = inode->i_mtime = inode->i_ctime;
 78         inode->i_blocks         = 0;
 79         inode->i_generation     = vnode->fid.unique;
 80         inode->i_version        = vnode->status.data_version;
 81         inode->i_mapping->a_ops = &afs_fs_aops;
 82 
 83         /* check to see whether a symbolic link is really a mountpoint */
 84         if (vnode->status.type == AFS_FTYPE_SYMLINK) {
 85                 afs_mntpt_check_symlink(vnode, key);
 86 
 87                 if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) {
 88                         inode->i_mode   = S_IFDIR | vnode->status.mode;
 89                         inode->i_op     = &afs_mntpt_inode_operations;
 90                         inode->i_fop    = &afs_mntpt_file_operations;
 91                 }
 92         }
 93 
 94         return 0;
 95 }
 96 
 97 /*
 98  * iget5() comparator
 99  */
100 static int afs_iget5_test(struct inode *inode, void *opaque)
101 {
102         struct afs_iget_data *data = opaque;
103 
104         return inode->i_ino == data->fid.vnode &&
105                 inode->i_generation == data->fid.unique;
106 }
107 
108 /*
109  * iget5() comparator for inode created by autocell operations
110  *
111  * These pseudo inodes don't match anything.
112  */
113 static int afs_iget5_autocell_test(struct inode *inode, void *opaque)
114 {
115         return 0;
116 }
117 
118 /*
119  * iget5() inode initialiser
120  */
121 static int afs_iget5_set(struct inode *inode, void *opaque)
122 {
123         struct afs_iget_data *data = opaque;
124         struct afs_vnode *vnode = AFS_FS_I(inode);
125 
126         inode->i_ino = data->fid.vnode;
127         inode->i_generation = data->fid.unique;
128         vnode->fid = data->fid;
129         vnode->volume = data->volume;
130 
131         return 0;
132 }
133 
134 /*
135  * inode retrieval for autocell
136  */
137 struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
138                                 int namesz, struct key *key)
139 {
140         struct afs_iget_data data;
141         struct afs_super_info *as;
142         struct afs_vnode *vnode;
143         struct super_block *sb;
144         struct inode *inode;
145         static atomic_t afs_autocell_ino;
146 
147         _enter("{%x:%u},%*.*s,",
148                AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode,
149                namesz, namesz, dev_name ?: "");
150 
151         sb = dir->i_sb;
152         as = sb->s_fs_info;
153         data.volume = as->volume;
154         data.fid.vid = as->volume->vid;
155         data.fid.unique = 0;
156         data.fid.vnode = 0;
157 
158         inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino),
159                              afs_iget5_autocell_test, afs_iget5_set,
160                              &data);
161         if (!inode) {
162                 _leave(" = -ENOMEM");
163                 return ERR_PTR(-ENOMEM);
164         }
165 
166         _debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
167                inode, inode->i_ino, data.fid.vid, data.fid.vnode,
168                data.fid.unique);
169 
170         vnode = AFS_FS_I(inode);
171 
172         /* there shouldn't be an existing inode */
173         BUG_ON(!(inode->i_state & I_NEW));
174 
175         inode->i_size           = 0;
176         inode->i_mode           = S_IFDIR | S_IRUGO | S_IXUGO;
177         inode->i_op             = &afs_autocell_inode_operations;
178         set_nlink(inode, 2);
179         inode->i_uid            = GLOBAL_ROOT_UID;
180         inode->i_gid            = GLOBAL_ROOT_GID;
181         inode->i_ctime.tv_sec   = get_seconds();
182         inode->i_ctime.tv_nsec  = 0;
183         inode->i_atime          = inode->i_mtime = inode->i_ctime;
184         inode->i_blocks         = 0;
185         inode->i_version        = 0;
186         inode->i_generation     = 0;
187 
188         set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
189         set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
190         inode->i_flags |= S_AUTOMOUNT | S_NOATIME;
191         unlock_new_inode(inode);
192         _leave(" = %p", inode);
193         return inode;
194 }
195 
196 /*
197  * inode retrieval
198  */
199 struct inode *afs_iget(struct super_block *sb, struct key *key,
200                        struct afs_fid *fid, struct afs_file_status *status,
201                        struct afs_callback *cb)
202 {
203         struct afs_iget_data data = { .fid = *fid };
204         struct afs_super_info *as;
205         struct afs_vnode *vnode;
206         struct inode *inode;
207         int ret;
208 
209         _enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
210 
211         as = sb->s_fs_info;
212         data.volume = as->volume;
213 
214         inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
215                              &data);
216         if (!inode) {
217                 _leave(" = -ENOMEM");
218                 return ERR_PTR(-ENOMEM);
219         }
220 
221         _debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
222                inode, fid->vid, fid->vnode, fid->unique);
223 
224         vnode = AFS_FS_I(inode);
225 
226         /* deal with an existing inode */
227         if (!(inode->i_state & I_NEW)) {
228                 _leave(" = %p", inode);
229                 return inode;
230         }
231 
232         if (!status) {
233                 /* it's a remotely extant inode */
234                 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
235                 ret = afs_vnode_fetch_status(vnode, NULL, key);
236                 if (ret < 0)
237                         goto bad_inode;
238         } else {
239                 /* it's an inode we just created */
240                 memcpy(&vnode->status, status, sizeof(vnode->status));
241 
242                 if (!cb) {
243                         /* it's a symlink we just created (the fileserver
244                          * didn't give us a callback) */
245                         vnode->cb_version = 0;
246                         vnode->cb_expiry = 0;
247                         vnode->cb_type = 0;
248                         vnode->cb_expires = get_seconds();
249                 } else {
250                         vnode->cb_version = cb->version;
251                         vnode->cb_expiry = cb->expiry;
252                         vnode->cb_type = cb->type;
253                         vnode->cb_expires = vnode->cb_expiry + get_seconds();
254                 }
255         }
256 
257         /* set up caching before mapping the status, as map-status reads the
258          * first page of symlinks to see if they're really mountpoints */
259         inode->i_size = vnode->status.size;
260 #ifdef CONFIG_AFS_FSCACHE
261         vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
262                                               &afs_vnode_cache_index_def,
263                                               vnode, true);
264 #endif
265 
266         ret = afs_inode_map_status(vnode, key);
267         if (ret < 0)
268                 goto bad_inode;
269 
270         /* success */
271         clear_bit(AFS_VNODE_UNSET, &vnode->flags);
272         inode->i_flags |= S_NOATIME;
273         unlock_new_inode(inode);
274         _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
275         return inode;
276 
277         /* failure */
278 bad_inode:
279 #ifdef CONFIG_AFS_FSCACHE
280         fscache_relinquish_cookie(vnode->cache, 0);
281         vnode->cache = NULL;
282 #endif
283         iget_failed(inode);
284         _leave(" = %d [bad]", ret);
285         return ERR_PTR(ret);
286 }
287 
288 /*
289  * mark the data attached to an inode as obsolete due to a write on the server
290  * - might also want to ditch all the outstanding writes and dirty pages
291  */
292 void afs_zap_data(struct afs_vnode *vnode)
293 {
294         _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
295 
296         /* nuke all the non-dirty pages that aren't locked, mapped or being
297          * written back in a regular file and completely discard the pages in a
298          * directory or symlink */
299         if (S_ISREG(vnode->vfs_inode.i_mode))
300                 invalidate_remote_inode(&vnode->vfs_inode);
301         else
302                 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
303 }
304 
305 /*
306  * validate a vnode/inode
307  * - there are several things we need to check
308  *   - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
309  *     symlink)
310  *   - parent dir metadata changed (security changes)
311  *   - dentry data changed (write, truncate)
312  *   - dentry metadata changed (security changes)
313  */
314 int afs_validate(struct afs_vnode *vnode, struct key *key)
315 {
316         int ret;
317 
318         _enter("{v={%x:%u} fl=%lx},%x",
319                vnode->fid.vid, vnode->fid.vnode, vnode->flags,
320                key_serial(key));
321 
322         if (vnode->cb_promised &&
323             !test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
324             !test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
325             !test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
326                 if (vnode->cb_expires < get_seconds() + 10) {
327                         _debug("callback expired");
328                         set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
329                 } else {
330                         goto valid;
331                 }
332         }
333 
334         if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
335                 goto valid;
336 
337         mutex_lock(&vnode->validate_lock);
338 
339         /* if the promise has expired, we need to check the server again to get
340          * a new promise - note that if the (parent) directory's metadata was
341          * changed then the security may be different and we may no longer have
342          * access */
343         if (!vnode->cb_promised ||
344             test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
345                 _debug("not promised");
346                 ret = afs_vnode_fetch_status(vnode, NULL, key);
347                 if (ret < 0)
348                         goto error_unlock;
349                 _debug("new promise [fl=%lx]", vnode->flags);
350         }
351 
352         if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
353                 _debug("file already deleted");
354                 ret = -ESTALE;
355                 goto error_unlock;
356         }
357 
358         /* if the vnode's data version number changed then its contents are
359          * different */
360         if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
361                 afs_zap_data(vnode);
362 
363         clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
364         mutex_unlock(&vnode->validate_lock);
365 valid:
366         _leave(" = 0");
367         return 0;
368 
369 error_unlock:
370         mutex_unlock(&vnode->validate_lock);
371         _leave(" = %d", ret);
372         return ret;
373 }
374 
375 /*
376  * read the attributes of an inode
377  */
378 int afs_getattr(struct vfsmount *mnt, struct dentry *dentry,
379                       struct kstat *stat)
380 {
381         struct inode *inode;
382 
383         inode = d_inode(dentry);
384 
385         _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
386 
387         generic_fillattr(inode, stat);
388         return 0;
389 }
390 
391 /*
392  * discard an AFS inode
393  */
394 int afs_drop_inode(struct inode *inode)
395 {
396         _enter("");
397 
398         if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
399                 return generic_delete_inode(inode);
400         else
401                 return generic_drop_inode(inode);
402 }
403 
404 /*
405  * clear an AFS inode
406  */
407 void afs_evict_inode(struct inode *inode)
408 {
409         struct afs_permits *permits;
410         struct afs_vnode *vnode;
411 
412         vnode = AFS_FS_I(inode);
413 
414         _enter("{%x:%u.%d} v=%u x=%u t=%u }",
415                vnode->fid.vid,
416                vnode->fid.vnode,
417                vnode->fid.unique,
418                vnode->cb_version,
419                vnode->cb_expiry,
420                vnode->cb_type);
421 
422         _debug("CLEAR INODE %p", inode);
423 
424         ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
425 
426         truncate_inode_pages_final(&inode->i_data);
427         clear_inode(inode);
428 
429         afs_give_up_callback(vnode);
430 
431         if (vnode->server) {
432                 spin_lock(&vnode->server->fs_lock);
433                 rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
434                 spin_unlock(&vnode->server->fs_lock);
435                 afs_put_server(vnode->server);
436                 vnode->server = NULL;
437         }
438 
439         ASSERT(list_empty(&vnode->writebacks));
440         ASSERT(!vnode->cb_promised);
441 
442 #ifdef CONFIG_AFS_FSCACHE
443         fscache_relinquish_cookie(vnode->cache, 0);
444         vnode->cache = NULL;
445 #endif
446 
447         mutex_lock(&vnode->permits_lock);
448         permits = vnode->permits;
449         rcu_assign_pointer(vnode->permits, NULL);
450         mutex_unlock(&vnode->permits_lock);
451         if (permits)
452                 call_rcu(&permits->rcu, afs_zap_permits);
453 
454         _leave("");
455 }
456 
457 /*
458  * set the attributes of an inode
459  */
460 int afs_setattr(struct dentry *dentry, struct iattr *attr)
461 {
462         struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
463         struct key *key;
464         int ret;
465 
466         _enter("{%x:%u},{n=%pd},%x",
467                vnode->fid.vid, vnode->fid.vnode, dentry,
468                attr->ia_valid);
469 
470         if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
471                                 ATTR_MTIME))) {
472                 _leave(" = 0 [unsupported]");
473                 return 0;
474         }
475 
476         /* flush any dirty data outstanding on a regular file */
477         if (S_ISREG(vnode->vfs_inode.i_mode)) {
478                 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
479                 afs_writeback_all(vnode);
480         }
481 
482         if (attr->ia_valid & ATTR_FILE) {
483                 key = attr->ia_file->private_data;
484         } else {
485                 key = afs_request_key(vnode->volume->cell);
486                 if (IS_ERR(key)) {
487                         ret = PTR_ERR(key);
488                         goto error;
489                 }
490         }
491 
492         ret = afs_vnode_setattr(vnode, key, attr);
493         if (!(attr->ia_valid & ATTR_FILE))
494                 key_put(key);
495 
496 error:
497         _leave(" = %d", ret);
498         return ret;
499 }
500 

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