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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
26struct 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 */
34static 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 */
100static 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 */
113static int afs_iget5_autocell_test(struct inode *inode, void *opaque)
114{
115 return 0;
116}
117
118/*
119 * iget5() inode initialiser
120 */
121static 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 */
137struct 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 */
199struct 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 */
278bad_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 */
292void 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 */
314int 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);
365valid:
366 _leave(" = 0");
367 return 0;
368
369error_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 */
378int 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 */
394int 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 */
407void 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 */
460int 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
496error:
497 _leave(" = %d", ret);
498 return ret;
499}
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 <linux/iversion.h>
25#include "internal.h"
26
27static const struct inode_operations afs_symlink_inode_operations = {
28 .get_link = page_get_link,
29 .listxattr = afs_listxattr,
30};
31
32/*
33 * Initialise an inode from the vnode status.
34 */
35static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key)
36{
37 struct inode *inode = AFS_VNODE_TO_I(vnode);
38
39 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
40 vnode->status.type,
41 vnode->status.nlink,
42 (unsigned long long) vnode->status.size,
43 vnode->status.data_version,
44 vnode->status.mode);
45
46 read_seqlock_excl(&vnode->cb_lock);
47
48 afs_update_inode_from_status(vnode, &vnode->status, NULL,
49 AFS_VNODE_NOT_YET_SET);
50
51 switch (vnode->status.type) {
52 case AFS_FTYPE_FILE:
53 inode->i_mode = S_IFREG | vnode->status.mode;
54 inode->i_op = &afs_file_inode_operations;
55 inode->i_fop = &afs_file_operations;
56 inode->i_mapping->a_ops = &afs_fs_aops;
57 break;
58 case AFS_FTYPE_DIR:
59 inode->i_mode = S_IFDIR | vnode->status.mode;
60 inode->i_op = &afs_dir_inode_operations;
61 inode->i_fop = &afs_dir_file_operations;
62 inode->i_mapping->a_ops = &afs_dir_aops;
63 break;
64 case AFS_FTYPE_SYMLINK:
65 /* Symlinks with a mode of 0644 are actually mountpoints. */
66 if ((vnode->status.mode & 0777) == 0644) {
67 inode->i_flags |= S_AUTOMOUNT;
68
69 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
70
71 inode->i_mode = S_IFDIR | 0555;
72 inode->i_op = &afs_mntpt_inode_operations;
73 inode->i_fop = &afs_mntpt_file_operations;
74 inode->i_mapping->a_ops = &afs_fs_aops;
75 } else {
76 inode->i_mode = S_IFLNK | vnode->status.mode;
77 inode->i_op = &afs_symlink_inode_operations;
78 inode->i_mapping->a_ops = &afs_fs_aops;
79 }
80 inode_nohighmem(inode);
81 break;
82 default:
83 printk("kAFS: AFS vnode with undefined type\n");
84 read_sequnlock_excl(&vnode->cb_lock);
85 return afs_protocol_error(NULL, -EBADMSG);
86 }
87
88 inode->i_blocks = 0;
89 vnode->invalid_before = vnode->status.data_version;
90
91 read_sequnlock_excl(&vnode->cb_lock);
92 return 0;
93}
94
95/*
96 * Fetch file status from the volume.
97 */
98int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool new_inode)
99{
100 struct afs_fs_cursor fc;
101 int ret;
102
103 _enter("%s,{%x:%u.%u,S=%lx}",
104 vnode->volume->name,
105 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
106 vnode->flags);
107
108 ret = -ERESTARTSYS;
109 if (afs_begin_vnode_operation(&fc, vnode, key)) {
110 while (afs_select_fileserver(&fc)) {
111 fc.cb_break = afs_calc_vnode_cb_break(vnode);
112 afs_fs_fetch_file_status(&fc, NULL, new_inode);
113 }
114
115 afs_check_for_remote_deletion(&fc, fc.vnode);
116 afs_vnode_commit_status(&fc, vnode, fc.cb_break);
117 ret = afs_end_vnode_operation(&fc);
118 }
119
120 _leave(" = %d", ret);
121 return ret;
122}
123
124/*
125 * iget5() comparator
126 */
127int afs_iget5_test(struct inode *inode, void *opaque)
128{
129 struct afs_iget_data *data = opaque;
130
131 return inode->i_ino == data->fid.vnode &&
132 inode->i_generation == data->fid.unique;
133}
134
135/*
136 * iget5() comparator for inode created by autocell operations
137 *
138 * These pseudo inodes don't match anything.
139 */
140static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque)
141{
142 return 0;
143}
144
145/*
146 * iget5() inode initialiser
147 */
148static int afs_iget5_set(struct inode *inode, void *opaque)
149{
150 struct afs_iget_data *data = opaque;
151 struct afs_vnode *vnode = AFS_FS_I(inode);
152
153 inode->i_ino = data->fid.vnode;
154 inode->i_generation = data->fid.unique;
155 vnode->fid = data->fid;
156 vnode->volume = data->volume;
157
158 return 0;
159}
160
161/*
162 * Create an inode for a dynamic root directory or an autocell dynamic
163 * automount dir.
164 */
165struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
166{
167 struct afs_iget_data data;
168 struct afs_super_info *as;
169 struct afs_vnode *vnode;
170 struct inode *inode;
171 static atomic_t afs_autocell_ino;
172
173 _enter("");
174
175 as = sb->s_fs_info;
176 if (as->volume) {
177 data.volume = as->volume;
178 data.fid.vid = as->volume->vid;
179 }
180 if (root) {
181 data.fid.vnode = 1;
182 data.fid.unique = 1;
183 } else {
184 data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
185 data.fid.unique = 0;
186 }
187
188 inode = iget5_locked(sb, data.fid.vnode,
189 afs_iget5_pseudo_dir_test, afs_iget5_set,
190 &data);
191 if (!inode) {
192 _leave(" = -ENOMEM");
193 return ERR_PTR(-ENOMEM);
194 }
195
196 _debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
197 inode, inode->i_ino, data.fid.vid, data.fid.vnode,
198 data.fid.unique);
199
200 vnode = AFS_FS_I(inode);
201
202 /* there shouldn't be an existing inode */
203 BUG_ON(!(inode->i_state & I_NEW));
204
205 inode->i_size = 0;
206 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
207 if (root) {
208 inode->i_op = &afs_dynroot_inode_operations;
209 inode->i_fop = &afs_dynroot_file_operations;
210 } else {
211 inode->i_op = &afs_autocell_inode_operations;
212 }
213 set_nlink(inode, 2);
214 inode->i_uid = GLOBAL_ROOT_UID;
215 inode->i_gid = GLOBAL_ROOT_GID;
216 inode->i_ctime.tv_sec = get_seconds();
217 inode->i_ctime.tv_nsec = 0;
218 inode->i_atime = inode->i_mtime = inode->i_ctime;
219 inode->i_blocks = 0;
220 inode_set_iversion_raw(inode, 0);
221 inode->i_generation = 0;
222
223 set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
224 if (!root) {
225 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
226 inode->i_flags |= S_AUTOMOUNT;
227 }
228
229 inode->i_flags |= S_NOATIME;
230 unlock_new_inode(inode);
231 _leave(" = %p", inode);
232 return inode;
233}
234
235/*
236 * Get a cache cookie for an inode.
237 */
238static void afs_get_inode_cache(struct afs_vnode *vnode)
239{
240#ifdef CONFIG_AFS_FSCACHE
241 struct {
242 u32 vnode_id;
243 u32 unique;
244 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
245 } __packed key;
246 struct afs_vnode_cache_aux aux;
247
248 if (vnode->status.type == AFS_FTYPE_DIR) {
249 vnode->cache = NULL;
250 return;
251 }
252
253 key.vnode_id = vnode->fid.vnode;
254 key.unique = vnode->fid.unique;
255 key.vnode_id_ext[0] = 0;
256 key.vnode_id_ext[1] = 0;
257 aux.data_version = vnode->status.data_version;
258
259 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
260 &afs_vnode_cache_index_def,
261 &key, sizeof(key),
262 &aux, sizeof(aux),
263 vnode, vnode->status.size, true);
264#endif
265}
266
267/*
268 * inode retrieval
269 */
270struct inode *afs_iget(struct super_block *sb, struct key *key,
271 struct afs_fid *fid, struct afs_file_status *status,
272 struct afs_callback *cb, struct afs_cb_interest *cbi)
273{
274 struct afs_iget_data data = { .fid = *fid };
275 struct afs_super_info *as;
276 struct afs_vnode *vnode;
277 struct inode *inode;
278 int ret;
279
280 _enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
281
282 as = sb->s_fs_info;
283 data.volume = as->volume;
284
285 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
286 &data);
287 if (!inode) {
288 _leave(" = -ENOMEM");
289 return ERR_PTR(-ENOMEM);
290 }
291
292 _debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
293 inode, fid->vid, fid->vnode, fid->unique);
294
295 vnode = AFS_FS_I(inode);
296
297 /* deal with an existing inode */
298 if (!(inode->i_state & I_NEW)) {
299 _leave(" = %p", inode);
300 return inode;
301 }
302
303 if (!status) {
304 /* it's a remotely extant inode */
305 ret = afs_fetch_status(vnode, key, true);
306 if (ret < 0)
307 goto bad_inode;
308 } else {
309 /* it's an inode we just created */
310 memcpy(&vnode->status, status, sizeof(vnode->status));
311
312 if (!cb) {
313 /* it's a symlink we just created (the fileserver
314 * didn't give us a callback) */
315 vnode->cb_version = 0;
316 vnode->cb_type = 0;
317 vnode->cb_expires_at = 0;
318 } else {
319 vnode->cb_version = cb->version;
320 vnode->cb_type = cb->type;
321 vnode->cb_expires_at = cb->expiry;
322 vnode->cb_interest = afs_get_cb_interest(cbi);
323 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
324 }
325
326 vnode->cb_expires_at += ktime_get_real_seconds();
327 }
328
329 ret = afs_inode_init_from_status(vnode, key);
330 if (ret < 0)
331 goto bad_inode;
332
333 afs_get_inode_cache(vnode);
334
335 /* success */
336 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
337 inode->i_flags |= S_NOATIME;
338 unlock_new_inode(inode);
339 _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
340 return inode;
341
342 /* failure */
343bad_inode:
344 iget_failed(inode);
345 _leave(" = %d [bad]", ret);
346 return ERR_PTR(ret);
347}
348
349/*
350 * mark the data attached to an inode as obsolete due to a write on the server
351 * - might also want to ditch all the outstanding writes and dirty pages
352 */
353void afs_zap_data(struct afs_vnode *vnode)
354{
355 _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
356
357#ifdef CONFIG_AFS_FSCACHE
358 fscache_invalidate(vnode->cache);
359#endif
360
361 /* nuke all the non-dirty pages that aren't locked, mapped or being
362 * written back in a regular file and completely discard the pages in a
363 * directory or symlink */
364 if (S_ISREG(vnode->vfs_inode.i_mode))
365 invalidate_remote_inode(&vnode->vfs_inode);
366 else
367 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
368}
369
370/*
371 * validate a vnode/inode
372 * - there are several things we need to check
373 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
374 * symlink)
375 * - parent dir metadata changed (security changes)
376 * - dentry data changed (write, truncate)
377 * - dentry metadata changed (security changes)
378 */
379int afs_validate(struct afs_vnode *vnode, struct key *key)
380{
381 time64_t now = ktime_get_real_seconds();
382 bool valid = false;
383 int ret;
384
385 _enter("{v={%x:%u} fl=%lx},%x",
386 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
387 key_serial(key));
388
389 /* Quickly check the callback state. Ideally, we'd use read_seqbegin
390 * here, but we have no way to pass the net namespace to the RCU
391 * cleanup for the server record.
392 */
393 read_seqlock_excl(&vnode->cb_lock);
394
395 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
396 if (vnode->cb_s_break != vnode->cb_interest->server->cb_s_break ||
397 vnode->cb_v_break != vnode->volume->cb_v_break) {
398 vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
399 vnode->cb_v_break = vnode->volume->cb_v_break;
400 valid = false;
401 } else if (vnode->status.type == AFS_FTYPE_DIR &&
402 test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) &&
403 vnode->cb_expires_at - 10 > now) {
404 valid = true;
405 } else if (!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) &&
406 vnode->cb_expires_at - 10 > now) {
407 valid = true;
408 }
409 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
410 valid = true;
411 }
412
413 read_sequnlock_excl(&vnode->cb_lock);
414
415 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
416 clear_nlink(&vnode->vfs_inode);
417
418 if (valid)
419 goto valid;
420
421 down_write(&vnode->validate_lock);
422
423 /* if the promise has expired, we need to check the server again to get
424 * a new promise - note that if the (parent) directory's metadata was
425 * changed then the security may be different and we may no longer have
426 * access */
427 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
428 _debug("not promised");
429 ret = afs_fetch_status(vnode, key, false);
430 if (ret < 0) {
431 if (ret == -ENOENT) {
432 set_bit(AFS_VNODE_DELETED, &vnode->flags);
433 ret = -ESTALE;
434 }
435 goto error_unlock;
436 }
437 _debug("new promise [fl=%lx]", vnode->flags);
438 }
439
440 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
441 _debug("file already deleted");
442 ret = -ESTALE;
443 goto error_unlock;
444 }
445
446 /* if the vnode's data version number changed then its contents are
447 * different */
448 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
449 afs_zap_data(vnode);
450 up_write(&vnode->validate_lock);
451valid:
452 _leave(" = 0");
453 return 0;
454
455error_unlock:
456 up_write(&vnode->validate_lock);
457 _leave(" = %d", ret);
458 return ret;
459}
460
461/*
462 * read the attributes of an inode
463 */
464int afs_getattr(const struct path *path, struct kstat *stat,
465 u32 request_mask, unsigned int query_flags)
466{
467 struct inode *inode = d_inode(path->dentry);
468 struct afs_vnode *vnode = AFS_FS_I(inode);
469 int seq = 0;
470
471 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
472
473 do {
474 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
475 generic_fillattr(inode, stat);
476 } while (need_seqretry(&vnode->cb_lock, seq));
477
478 done_seqretry(&vnode->cb_lock, seq);
479 return 0;
480}
481
482/*
483 * discard an AFS inode
484 */
485int afs_drop_inode(struct inode *inode)
486{
487 _enter("");
488
489 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
490 return generic_delete_inode(inode);
491 else
492 return generic_drop_inode(inode);
493}
494
495/*
496 * clear an AFS inode
497 */
498void afs_evict_inode(struct inode *inode)
499{
500 struct afs_vnode *vnode;
501
502 vnode = AFS_FS_I(inode);
503
504 _enter("{%x:%u.%d}",
505 vnode->fid.vid,
506 vnode->fid.vnode,
507 vnode->fid.unique);
508
509 _debug("CLEAR INODE %p", inode);
510
511 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
512
513 truncate_inode_pages_final(&inode->i_data);
514 clear_inode(inode);
515
516 if (vnode->cb_interest) {
517 afs_put_cb_interest(afs_i2net(inode), vnode->cb_interest);
518 vnode->cb_interest = NULL;
519 }
520
521 while (!list_empty(&vnode->wb_keys)) {
522 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
523 struct afs_wb_key, vnode_link);
524 list_del(&wbk->vnode_link);
525 afs_put_wb_key(wbk);
526 }
527
528#ifdef CONFIG_AFS_FSCACHE
529 {
530 struct afs_vnode_cache_aux aux;
531
532 aux.data_version = vnode->status.data_version;
533 fscache_relinquish_cookie(vnode->cache, &aux,
534 test_bit(AFS_VNODE_DELETED, &vnode->flags));
535 vnode->cache = NULL;
536 }
537#endif
538
539 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
540 _leave("");
541}
542
543/*
544 * set the attributes of an inode
545 */
546int afs_setattr(struct dentry *dentry, struct iattr *attr)
547{
548 struct afs_fs_cursor fc;
549 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
550 struct key *key;
551 int ret;
552
553 _enter("{%x:%u},{n=%pd},%x",
554 vnode->fid.vid, vnode->fid.vnode, dentry,
555 attr->ia_valid);
556
557 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
558 ATTR_MTIME))) {
559 _leave(" = 0 [unsupported]");
560 return 0;
561 }
562
563 /* flush any dirty data outstanding on a regular file */
564 if (S_ISREG(vnode->vfs_inode.i_mode))
565 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
566
567 if (attr->ia_valid & ATTR_FILE) {
568 key = afs_file_key(attr->ia_file);
569 } else {
570 key = afs_request_key(vnode->volume->cell);
571 if (IS_ERR(key)) {
572 ret = PTR_ERR(key);
573 goto error;
574 }
575 }
576
577 ret = -ERESTARTSYS;
578 if (afs_begin_vnode_operation(&fc, vnode, key)) {
579 while (afs_select_fileserver(&fc)) {
580 fc.cb_break = afs_calc_vnode_cb_break(vnode);
581 afs_fs_setattr(&fc, attr);
582 }
583
584 afs_check_for_remote_deletion(&fc, fc.vnode);
585 afs_vnode_commit_status(&fc, vnode, fc.cb_break);
586 ret = afs_end_vnode_operation(&fc);
587 }
588
589 if (!(attr->ia_valid & ATTR_FILE))
590 key_put(key);
591
592error:
593 _leave(" = %d", ret);
594 return ret;
595}