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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 <linux/iversion.h>
25#include "internal.h"
26#include "afs_fs.h"
27
28static const struct inode_operations afs_symlink_inode_operations = {
29 .get_link = page_get_link,
30};
31
32static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
33{
34 static unsigned long once_only;
35
36 pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type);
37 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
38 vnode->status.abort_code,
39 vnode->status.mode,
40 vnode->status.size,
41 vnode->status.data_version);
42 pr_warn("kAFS: vnode %llx:%llx:%x\n",
43 vnode->fid.vid,
44 vnode->fid.vnode,
45 vnode->fid.unique);
46 if (parent_vnode)
47 pr_warn("kAFS: dir %llx:%llx:%x\n",
48 parent_vnode->fid.vid,
49 parent_vnode->fid.vnode,
50 parent_vnode->fid.unique);
51
52 if (!test_and_set_bit(0, &once_only))
53 dump_stack();
54}
55
56/*
57 * Set parameters for the netfs library
58 */
59static void afs_set_netfs_context(struct afs_vnode *vnode)
60{
61 netfs_inode_init(&vnode->netfs, &afs_req_ops);
62}
63
64/*
65 * Initialise an inode from the vnode status.
66 */
67static int afs_inode_init_from_status(struct afs_operation *op,
68 struct afs_vnode_param *vp,
69 struct afs_vnode *vnode)
70{
71 struct afs_file_status *status = &vp->scb.status;
72 struct inode *inode = AFS_VNODE_TO_I(vnode);
73 struct timespec64 t;
74
75 _enter("{%llx:%llu.%u} %s",
76 vp->fid.vid, vp->fid.vnode, vp->fid.unique,
77 op->type ? op->type->name : "???");
78
79 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
80 status->type,
81 status->nlink,
82 (unsigned long long) status->size,
83 status->data_version,
84 status->mode);
85
86 write_seqlock(&vnode->cb_lock);
87
88 vnode->cb_v_break = op->cb_v_break;
89 vnode->cb_s_break = op->cb_s_break;
90 vnode->status = *status;
91
92 t = status->mtime_client;
93 inode->i_ctime = t;
94 inode->i_mtime = t;
95 inode->i_atime = t;
96 inode->i_flags |= S_NOATIME;
97 inode->i_uid = make_kuid(&init_user_ns, status->owner);
98 inode->i_gid = make_kgid(&init_user_ns, status->group);
99 set_nlink(&vnode->netfs.inode, status->nlink);
100
101 switch (status->type) {
102 case AFS_FTYPE_FILE:
103 inode->i_mode = S_IFREG | (status->mode & S_IALLUGO);
104 inode->i_op = &afs_file_inode_operations;
105 inode->i_fop = &afs_file_operations;
106 inode->i_mapping->a_ops = &afs_file_aops;
107 mapping_set_large_folios(inode->i_mapping);
108 break;
109 case AFS_FTYPE_DIR:
110 inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO);
111 inode->i_op = &afs_dir_inode_operations;
112 inode->i_fop = &afs_dir_file_operations;
113 inode->i_mapping->a_ops = &afs_dir_aops;
114 mapping_set_large_folios(inode->i_mapping);
115 break;
116 case AFS_FTYPE_SYMLINK:
117 /* Symlinks with a mode of 0644 are actually mountpoints. */
118 if ((status->mode & 0777) == 0644) {
119 inode->i_flags |= S_AUTOMOUNT;
120
121 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
122
123 inode->i_mode = S_IFDIR | 0555;
124 inode->i_op = &afs_mntpt_inode_operations;
125 inode->i_fop = &afs_mntpt_file_operations;
126 inode->i_mapping->a_ops = &afs_symlink_aops;
127 } else {
128 inode->i_mode = S_IFLNK | status->mode;
129 inode->i_op = &afs_symlink_inode_operations;
130 inode->i_mapping->a_ops = &afs_symlink_aops;
131 }
132 inode_nohighmem(inode);
133 break;
134 default:
135 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL);
136 write_sequnlock(&vnode->cb_lock);
137 return afs_protocol_error(NULL, afs_eproto_file_type);
138 }
139
140 afs_set_i_size(vnode, status->size);
141 afs_set_netfs_context(vnode);
142
143 vnode->invalid_before = status->data_version;
144 inode_set_iversion_raw(&vnode->netfs.inode, status->data_version);
145
146 if (!vp->scb.have_cb) {
147 /* it's a symlink we just created (the fileserver
148 * didn't give us a callback) */
149 vnode->cb_expires_at = ktime_get_real_seconds();
150 } else {
151 vnode->cb_expires_at = vp->scb.callback.expires_at;
152 vnode->cb_server = op->server;
153 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
154 }
155
156 write_sequnlock(&vnode->cb_lock);
157 return 0;
158}
159
160/*
161 * Update the core inode struct from a returned status record.
162 */
163static void afs_apply_status(struct afs_operation *op,
164 struct afs_vnode_param *vp)
165{
166 struct afs_file_status *status = &vp->scb.status;
167 struct afs_vnode *vnode = vp->vnode;
168 struct inode *inode = &vnode->netfs.inode;
169 struct timespec64 t;
170 umode_t mode;
171 bool data_changed = false;
172 bool change_size = vp->set_size;
173
174 _enter("{%llx:%llu.%u} %s",
175 vp->fid.vid, vp->fid.vnode, vp->fid.unique,
176 op->type ? op->type->name : "???");
177
178 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
179
180 if (status->type != vnode->status.type) {
181 pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n",
182 vnode->fid.vid,
183 vnode->fid.vnode,
184 vnode->fid.unique,
185 status->type, vnode->status.type);
186 afs_protocol_error(NULL, afs_eproto_bad_status);
187 return;
188 }
189
190 if (status->nlink != vnode->status.nlink)
191 set_nlink(inode, status->nlink);
192
193 if (status->owner != vnode->status.owner)
194 inode->i_uid = make_kuid(&init_user_ns, status->owner);
195
196 if (status->group != vnode->status.group)
197 inode->i_gid = make_kgid(&init_user_ns, status->group);
198
199 if (status->mode != vnode->status.mode) {
200 mode = inode->i_mode;
201 mode &= ~S_IALLUGO;
202 mode |= status->mode & S_IALLUGO;
203 WRITE_ONCE(inode->i_mode, mode);
204 }
205
206 t = status->mtime_client;
207 inode->i_mtime = t;
208 if (vp->update_ctime)
209 inode->i_ctime = op->ctime;
210
211 if (vnode->status.data_version != status->data_version)
212 data_changed = true;
213
214 vnode->status = *status;
215
216 if (vp->dv_before + vp->dv_delta != status->data_version) {
217 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags))
218 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s (op=%x)\n",
219 vnode->fid.vid, vnode->fid.vnode,
220 (unsigned long long)vp->dv_before + vp->dv_delta,
221 (unsigned long long)status->data_version,
222 op->type ? op->type->name : "???",
223 op->debug_id);
224
225 vnode->invalid_before = status->data_version;
226 if (vnode->status.type == AFS_FTYPE_DIR) {
227 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
228 afs_stat_v(vnode, n_inval);
229 } else {
230 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
231 }
232 change_size = true;
233 } else if (vnode->status.type == AFS_FTYPE_DIR) {
234 /* Expected directory change is handled elsewhere so
235 * that we can locally edit the directory and save on a
236 * download.
237 */
238 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
239 data_changed = false;
240 change_size = true;
241 }
242
243 if (data_changed) {
244 inode_set_iversion_raw(inode, status->data_version);
245
246 /* Only update the size if the data version jumped. If the
247 * file is being modified locally, then we might have our own
248 * idea of what the size should be that's not the same as
249 * what's on the server.
250 */
251 vnode->netfs.remote_i_size = status->size;
252 if (change_size) {
253 afs_set_i_size(vnode, status->size);
254 inode->i_ctime = t;
255 inode->i_atime = t;
256 }
257 }
258}
259
260/*
261 * Apply a callback to a vnode.
262 */
263static void afs_apply_callback(struct afs_operation *op,
264 struct afs_vnode_param *vp)
265{
266 struct afs_callback *cb = &vp->scb.callback;
267 struct afs_vnode *vnode = vp->vnode;
268
269 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) {
270 vnode->cb_expires_at = cb->expires_at;
271 vnode->cb_server = op->server;
272 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
273 }
274}
275
276/*
277 * Apply the received status and callback to an inode all in the same critical
278 * section to avoid races with afs_validate().
279 */
280void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp)
281{
282 struct afs_vnode *vnode = vp->vnode;
283
284 _enter("");
285
286 write_seqlock(&vnode->cb_lock);
287
288 if (vp->scb.have_error) {
289 /* A YFS server will return this from RemoveFile2 and AFS and
290 * YFS will return this from InlineBulkStatus.
291 */
292 if (vp->scb.status.abort_code == VNOVNODE) {
293 set_bit(AFS_VNODE_DELETED, &vnode->flags);
294 clear_nlink(&vnode->netfs.inode);
295 __afs_break_callback(vnode, afs_cb_break_for_deleted);
296 op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
297 }
298 } else if (vp->scb.have_status) {
299 if (vp->speculative &&
300 (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) ||
301 vp->dv_before != vnode->status.data_version))
302 /* Ignore the result of a speculative bulk status fetch
303 * if it splits around a modification op, thereby
304 * appearing to regress the data version.
305 */
306 goto out;
307 afs_apply_status(op, vp);
308 if (vp->scb.have_cb)
309 afs_apply_callback(op, vp);
310 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
311 drop_nlink(&vnode->netfs.inode);
312 if (vnode->netfs.inode.i_nlink == 0) {
313 set_bit(AFS_VNODE_DELETED, &vnode->flags);
314 __afs_break_callback(vnode, afs_cb_break_for_deleted);
315 }
316 }
317
318out:
319 write_sequnlock(&vnode->cb_lock);
320
321 if (vp->scb.have_status)
322 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
323}
324
325static void afs_fetch_status_success(struct afs_operation *op)
326{
327 struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
328 struct afs_vnode *vnode = vp->vnode;
329 int ret;
330
331 if (vnode->netfs.inode.i_state & I_NEW) {
332 ret = afs_inode_init_from_status(op, vp, vnode);
333 op->error = ret;
334 if (ret == 0)
335 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
336 } else {
337 afs_vnode_commit_status(op, vp);
338 }
339}
340
341const struct afs_operation_ops afs_fetch_status_operation = {
342 .issue_afs_rpc = afs_fs_fetch_status,
343 .issue_yfs_rpc = yfs_fs_fetch_status,
344 .success = afs_fetch_status_success,
345 .aborted = afs_check_for_remote_deletion,
346};
347
348/*
349 * Fetch file status from the volume.
350 */
351int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
352 afs_access_t *_caller_access)
353{
354 struct afs_operation *op;
355
356 _enter("%s,{%llx:%llu.%u,S=%lx}",
357 vnode->volume->name,
358 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
359 vnode->flags);
360
361 op = afs_alloc_operation(key, vnode->volume);
362 if (IS_ERR(op))
363 return PTR_ERR(op);
364
365 afs_op_set_vnode(op, 0, vnode);
366
367 op->nr_files = 1;
368 op->ops = &afs_fetch_status_operation;
369 afs_begin_vnode_operation(op);
370 afs_wait_for_operation(op);
371
372 if (_caller_access)
373 *_caller_access = op->file[0].scb.status.caller_access;
374 return afs_put_operation(op);
375}
376
377/*
378 * ilookup() comparator
379 */
380int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque)
381{
382 struct afs_vnode *vnode = AFS_FS_I(inode);
383 struct afs_fid *fid = opaque;
384
385 return (fid->vnode == vnode->fid.vnode &&
386 fid->vnode_hi == vnode->fid.vnode_hi &&
387 fid->unique == vnode->fid.unique);
388}
389
390/*
391 * iget5() comparator
392 */
393static int afs_iget5_test(struct inode *inode, void *opaque)
394{
395 struct afs_vnode_param *vp = opaque;
396 //struct afs_vnode *vnode = AFS_FS_I(inode);
397
398 return afs_ilookup5_test_by_fid(inode, &vp->fid);
399}
400
401/*
402 * iget5() inode initialiser
403 */
404static int afs_iget5_set(struct inode *inode, void *opaque)
405{
406 struct afs_vnode_param *vp = opaque;
407 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
408 struct afs_vnode *vnode = AFS_FS_I(inode);
409
410 vnode->volume = as->volume;
411 vnode->fid = vp->fid;
412
413 /* YFS supports 96-bit vnode IDs, but Linux only supports
414 * 64-bit inode numbers.
415 */
416 inode->i_ino = vnode->fid.vnode;
417 inode->i_generation = vnode->fid.unique;
418 return 0;
419}
420
421/*
422 * Get a cache cookie for an inode.
423 */
424static void afs_get_inode_cache(struct afs_vnode *vnode)
425{
426#ifdef CONFIG_AFS_FSCACHE
427 struct {
428 __be32 vnode_id;
429 __be32 unique;
430 __be32 vnode_id_ext[2]; /* Allow for a 96-bit key */
431 } __packed key;
432 struct afs_vnode_cache_aux aux;
433
434 if (vnode->status.type != AFS_FTYPE_FILE) {
435 vnode->netfs.cache = NULL;
436 return;
437 }
438
439 key.vnode_id = htonl(vnode->fid.vnode);
440 key.unique = htonl(vnode->fid.unique);
441 key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32);
442 key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi);
443 afs_set_cache_aux(vnode, &aux);
444
445 afs_vnode_set_cache(vnode,
446 fscache_acquire_cookie(
447 vnode->volume->cache,
448 vnode->status.type == AFS_FTYPE_FILE ?
449 0 : FSCACHE_ADV_SINGLE_CHUNK,
450 &key, sizeof(key),
451 &aux, sizeof(aux),
452 vnode->status.size));
453#endif
454}
455
456/*
457 * inode retrieval
458 */
459struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp)
460{
461 struct afs_vnode_param *dvp = &op->file[0];
462 struct super_block *sb = dvp->vnode->netfs.inode.i_sb;
463 struct afs_vnode *vnode;
464 struct inode *inode;
465 int ret;
466
467 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique);
468
469 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp);
470 if (!inode) {
471 _leave(" = -ENOMEM");
472 return ERR_PTR(-ENOMEM);
473 }
474
475 vnode = AFS_FS_I(inode);
476
477 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
478 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
479
480 /* deal with an existing inode */
481 if (!(inode->i_state & I_NEW)) {
482 _leave(" = %p", inode);
483 return inode;
484 }
485
486 ret = afs_inode_init_from_status(op, vp, vnode);
487 if (ret < 0)
488 goto bad_inode;
489
490 afs_get_inode_cache(vnode);
491
492 /* success */
493 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
494 unlock_new_inode(inode);
495 _leave(" = %p", inode);
496 return inode;
497
498 /* failure */
499bad_inode:
500 iget_failed(inode);
501 _leave(" = %d [bad]", ret);
502 return ERR_PTR(ret);
503}
504
505static int afs_iget5_set_root(struct inode *inode, void *opaque)
506{
507 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
508 struct afs_vnode *vnode = AFS_FS_I(inode);
509
510 vnode->volume = as->volume;
511 vnode->fid.vid = as->volume->vid,
512 vnode->fid.vnode = 1;
513 vnode->fid.unique = 1;
514 inode->i_ino = 1;
515 inode->i_generation = 1;
516 return 0;
517}
518
519/*
520 * Set up the root inode for a volume. This is always vnode 1, unique 1 within
521 * the volume.
522 */
523struct inode *afs_root_iget(struct super_block *sb, struct key *key)
524{
525 struct afs_super_info *as = AFS_FS_S(sb);
526 struct afs_operation *op;
527 struct afs_vnode *vnode;
528 struct inode *inode;
529 int ret;
530
531 _enter(",{%llx},,", as->volume->vid);
532
533 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL);
534 if (!inode) {
535 _leave(" = -ENOMEM");
536 return ERR_PTR(-ENOMEM);
537 }
538
539 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid);
540
541 BUG_ON(!(inode->i_state & I_NEW));
542
543 vnode = AFS_FS_I(inode);
544 vnode->cb_v_break = as->volume->cb_v_break,
545 afs_set_netfs_context(vnode);
546
547 op = afs_alloc_operation(key, as->volume);
548 if (IS_ERR(op)) {
549 ret = PTR_ERR(op);
550 goto error;
551 }
552
553 afs_op_set_vnode(op, 0, vnode);
554
555 op->nr_files = 1;
556 op->ops = &afs_fetch_status_operation;
557 ret = afs_do_sync_operation(op);
558 if (ret < 0)
559 goto error;
560
561 afs_get_inode_cache(vnode);
562
563 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
564 unlock_new_inode(inode);
565 _leave(" = %p", inode);
566 return inode;
567
568error:
569 iget_failed(inode);
570 _leave(" = %d [bad]", ret);
571 return ERR_PTR(ret);
572}
573
574/*
575 * mark the data attached to an inode as obsolete due to a write on the server
576 * - might also want to ditch all the outstanding writes and dirty pages
577 */
578static void afs_zap_data(struct afs_vnode *vnode)
579{
580 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
581
582 afs_invalidate_cache(vnode, 0);
583
584 /* nuke all the non-dirty pages that aren't locked, mapped or being
585 * written back in a regular file and completely discard the pages in a
586 * directory or symlink */
587 if (S_ISREG(vnode->netfs.inode.i_mode))
588 invalidate_remote_inode(&vnode->netfs.inode);
589 else
590 invalidate_inode_pages2(vnode->netfs.inode.i_mapping);
591}
592
593/*
594 * Check to see if we have a server currently serving this volume and that it
595 * hasn't been reinitialised or dropped from the list.
596 */
597static bool afs_check_server_good(struct afs_vnode *vnode)
598{
599 struct afs_server_list *slist;
600 struct afs_server *server;
601 bool good;
602 int i;
603
604 if (vnode->cb_fs_s_break == atomic_read(&vnode->volume->cell->fs_s_break))
605 return true;
606
607 rcu_read_lock();
608
609 slist = rcu_dereference(vnode->volume->servers);
610 for (i = 0; i < slist->nr_servers; i++) {
611 server = slist->servers[i].server;
612 if (server == vnode->cb_server) {
613 good = (vnode->cb_s_break == server->cb_s_break);
614 rcu_read_unlock();
615 return good;
616 }
617 }
618
619 rcu_read_unlock();
620 return false;
621}
622
623/*
624 * Check the validity of a vnode/inode.
625 */
626bool afs_check_validity(struct afs_vnode *vnode)
627{
628 enum afs_cb_break_reason need_clear = afs_cb_break_no_break;
629 time64_t now = ktime_get_real_seconds();
630 unsigned int cb_break;
631 int seq = 0;
632
633 do {
634 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
635 cb_break = vnode->cb_break;
636
637 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
638 if (vnode->cb_v_break != vnode->volume->cb_v_break)
639 need_clear = afs_cb_break_for_v_break;
640 else if (!afs_check_server_good(vnode))
641 need_clear = afs_cb_break_for_s_reinit;
642 else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
643 need_clear = afs_cb_break_for_zap;
644 else if (vnode->cb_expires_at - 10 <= now)
645 need_clear = afs_cb_break_for_lapsed;
646 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
647 ;
648 } else {
649 need_clear = afs_cb_break_no_promise;
650 }
651
652 } while (need_seqretry(&vnode->cb_lock, seq));
653
654 done_seqretry(&vnode->cb_lock, seq);
655
656 if (need_clear == afs_cb_break_no_break)
657 return true;
658
659 write_seqlock(&vnode->cb_lock);
660 if (need_clear == afs_cb_break_no_promise)
661 vnode->cb_v_break = vnode->volume->cb_v_break;
662 else if (cb_break == vnode->cb_break)
663 __afs_break_callback(vnode, need_clear);
664 else
665 trace_afs_cb_miss(&vnode->fid, need_clear);
666 write_sequnlock(&vnode->cb_lock);
667 return false;
668}
669
670/*
671 * validate a vnode/inode
672 * - there are several things we need to check
673 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
674 * symlink)
675 * - parent dir metadata changed (security changes)
676 * - dentry data changed (write, truncate)
677 * - dentry metadata changed (security changes)
678 */
679int afs_validate(struct afs_vnode *vnode, struct key *key)
680{
681 int ret;
682
683 _enter("{v={%llx:%llu} fl=%lx},%x",
684 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
685 key_serial(key));
686
687 if (unlikely(test_bit(AFS_VNODE_DELETED, &vnode->flags))) {
688 if (vnode->netfs.inode.i_nlink)
689 clear_nlink(&vnode->netfs.inode);
690 goto valid;
691 }
692
693 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) &&
694 afs_check_validity(vnode))
695 goto valid;
696
697 down_write(&vnode->validate_lock);
698
699 /* if the promise has expired, we need to check the server again to get
700 * a new promise - note that if the (parent) directory's metadata was
701 * changed then the security may be different and we may no longer have
702 * access */
703 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
704 _debug("not promised");
705 ret = afs_fetch_status(vnode, key, false, NULL);
706 if (ret < 0) {
707 if (ret == -ENOENT) {
708 set_bit(AFS_VNODE_DELETED, &vnode->flags);
709 ret = -ESTALE;
710 }
711 goto error_unlock;
712 }
713 _debug("new promise [fl=%lx]", vnode->flags);
714 }
715
716 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
717 _debug("file already deleted");
718 ret = -ESTALE;
719 goto error_unlock;
720 }
721
722 /* if the vnode's data version number changed then its contents are
723 * different */
724 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
725 afs_zap_data(vnode);
726 up_write(&vnode->validate_lock);
727valid:
728 _leave(" = 0");
729 return 0;
730
731error_unlock:
732 up_write(&vnode->validate_lock);
733 _leave(" = %d", ret);
734 return ret;
735}
736
737/*
738 * read the attributes of an inode
739 */
740int afs_getattr(struct user_namespace *mnt_userns, const struct path *path,
741 struct kstat *stat, u32 request_mask, unsigned int query_flags)
742{
743 struct inode *inode = d_inode(path->dentry);
744 struct afs_vnode *vnode = AFS_FS_I(inode);
745 struct key *key;
746 int ret, seq = 0;
747
748 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
749
750 if (vnode->volume &&
751 !(query_flags & AT_STATX_DONT_SYNC) &&
752 !test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
753 key = afs_request_key(vnode->volume->cell);
754 if (IS_ERR(key))
755 return PTR_ERR(key);
756 ret = afs_validate(vnode, key);
757 key_put(key);
758 if (ret < 0)
759 return ret;
760 }
761
762 do {
763 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
764 generic_fillattr(&init_user_ns, inode, stat);
765 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
766 stat->nlink > 0)
767 stat->nlink -= 1;
768 } while (need_seqretry(&vnode->cb_lock, seq));
769
770 done_seqretry(&vnode->cb_lock, seq);
771 return 0;
772}
773
774/*
775 * discard an AFS inode
776 */
777int afs_drop_inode(struct inode *inode)
778{
779 _enter("");
780
781 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
782 return generic_delete_inode(inode);
783 else
784 return generic_drop_inode(inode);
785}
786
787/*
788 * clear an AFS inode
789 */
790void afs_evict_inode(struct inode *inode)
791{
792 struct afs_vnode_cache_aux aux;
793 struct afs_vnode *vnode = AFS_FS_I(inode);
794
795 _enter("{%llx:%llu.%d}",
796 vnode->fid.vid,
797 vnode->fid.vnode,
798 vnode->fid.unique);
799
800 _debug("CLEAR INODE %p", inode);
801
802 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
803
804 truncate_inode_pages_final(&inode->i_data);
805
806 afs_set_cache_aux(vnode, &aux);
807 fscache_clear_inode_writeback(afs_vnode_cache(vnode), inode, &aux);
808 clear_inode(inode);
809
810 while (!list_empty(&vnode->wb_keys)) {
811 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
812 struct afs_wb_key, vnode_link);
813 list_del(&wbk->vnode_link);
814 afs_put_wb_key(wbk);
815 }
816
817 fscache_relinquish_cookie(afs_vnode_cache(vnode),
818 test_bit(AFS_VNODE_DELETED, &vnode->flags));
819
820 afs_prune_wb_keys(vnode);
821 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
822 key_put(vnode->silly_key);
823 vnode->silly_key = NULL;
824 key_put(vnode->lock_key);
825 vnode->lock_key = NULL;
826 _leave("");
827}
828
829static void afs_setattr_success(struct afs_operation *op)
830{
831 struct afs_vnode_param *vp = &op->file[0];
832 struct inode *inode = &vp->vnode->netfs.inode;
833 loff_t old_i_size = i_size_read(inode);
834
835 op->setattr.old_i_size = old_i_size;
836 afs_vnode_commit_status(op, vp);
837 /* inode->i_size has now been changed. */
838
839 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
840 loff_t size = op->setattr.attr->ia_size;
841 if (size > old_i_size)
842 pagecache_isize_extended(inode, old_i_size, size);
843 }
844}
845
846static void afs_setattr_edit_file(struct afs_operation *op)
847{
848 struct afs_vnode_param *vp = &op->file[0];
849 struct inode *inode = &vp->vnode->netfs.inode;
850
851 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
852 loff_t size = op->setattr.attr->ia_size;
853 loff_t i_size = op->setattr.old_i_size;
854
855 if (size < i_size)
856 truncate_pagecache(inode, size);
857 if (size != i_size)
858 fscache_resize_cookie(afs_vnode_cache(vp->vnode),
859 vp->scb.status.size);
860 }
861}
862
863static const struct afs_operation_ops afs_setattr_operation = {
864 .issue_afs_rpc = afs_fs_setattr,
865 .issue_yfs_rpc = yfs_fs_setattr,
866 .success = afs_setattr_success,
867 .edit_dir = afs_setattr_edit_file,
868};
869
870/*
871 * set the attributes of an inode
872 */
873int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
874 struct iattr *attr)
875{
876 const unsigned int supported =
877 ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
878 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH;
879 struct afs_operation *op;
880 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
881 struct inode *inode = &vnode->netfs.inode;
882 loff_t i_size;
883 int ret;
884
885 _enter("{%llx:%llu},{n=%pd},%x",
886 vnode->fid.vid, vnode->fid.vnode, dentry,
887 attr->ia_valid);
888
889 if (!(attr->ia_valid & supported)) {
890 _leave(" = 0 [unsupported]");
891 return 0;
892 }
893
894 i_size = i_size_read(inode);
895 if (attr->ia_valid & ATTR_SIZE) {
896 if (!S_ISREG(inode->i_mode))
897 return -EISDIR;
898
899 ret = inode_newsize_ok(inode, attr->ia_size);
900 if (ret)
901 return ret;
902
903 if (attr->ia_size == i_size)
904 attr->ia_valid &= ~ATTR_SIZE;
905 }
906
907 fscache_use_cookie(afs_vnode_cache(vnode), true);
908
909 /* Prevent any new writebacks from starting whilst we do this. */
910 down_write(&vnode->validate_lock);
911
912 if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) {
913 loff_t size = attr->ia_size;
914
915 /* Wait for any outstanding writes to the server to complete */
916 loff_t from = min(size, i_size);
917 loff_t to = max(size, i_size);
918 ret = filemap_fdatawait_range(inode->i_mapping, from, to);
919 if (ret < 0)
920 goto out_unlock;
921
922 /* Don't talk to the server if we're just shortening in-memory
923 * writes that haven't gone to the server yet.
924 */
925 if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) &&
926 attr->ia_size < i_size &&
927 attr->ia_size > vnode->status.size) {
928 truncate_pagecache(inode, attr->ia_size);
929 fscache_resize_cookie(afs_vnode_cache(vnode),
930 attr->ia_size);
931 i_size_write(inode, attr->ia_size);
932 ret = 0;
933 goto out_unlock;
934 }
935 }
936
937 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
938 afs_file_key(attr->ia_file) : NULL),
939 vnode->volume);
940 if (IS_ERR(op)) {
941 ret = PTR_ERR(op);
942 goto out_unlock;
943 }
944
945 afs_op_set_vnode(op, 0, vnode);
946 op->setattr.attr = attr;
947
948 if (attr->ia_valid & ATTR_SIZE) {
949 op->file[0].dv_delta = 1;
950 op->file[0].set_size = true;
951 }
952 op->ctime = attr->ia_ctime;
953 op->file[0].update_ctime = 1;
954 op->file[0].modification = true;
955
956 op->ops = &afs_setattr_operation;
957 ret = afs_do_sync_operation(op);
958
959out_unlock:
960 up_write(&vnode->validate_lock);
961 fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
962 _leave(" = %d", ret);
963 return ret;
964}
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#include "afs_fs.h"
27
28static const struct inode_operations afs_symlink_inode_operations = {
29 .get_link = page_get_link,
30 .listxattr = afs_listxattr,
31};
32
33static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
34{
35 static unsigned long once_only;
36
37 pr_warn("kAFS: AFS vnode with undefined type %u\n",
38 vnode->status.type);
39 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
40 vnode->status.abort_code,
41 vnode->status.mode,
42 vnode->status.size,
43 vnode->status.data_version);
44 pr_warn("kAFS: vnode %llx:%llx:%x\n",
45 vnode->fid.vid,
46 vnode->fid.vnode,
47 vnode->fid.unique);
48 if (parent_vnode)
49 pr_warn("kAFS: dir %llx:%llx:%x\n",
50 parent_vnode->fid.vid,
51 parent_vnode->fid.vnode,
52 parent_vnode->fid.unique);
53
54 if (!test_and_set_bit(0, &once_only))
55 dump_stack();
56}
57
58/*
59 * Set the file size and block count. Estimate the number of 512 bytes blocks
60 * used, rounded up to nearest 1K for consistency with other AFS clients.
61 */
62static void afs_set_i_size(struct afs_vnode *vnode, u64 size)
63{
64 i_size_write(&vnode->vfs_inode, size);
65 vnode->vfs_inode.i_blocks = ((size + 1023) >> 10) << 1;
66}
67
68/*
69 * Initialise an inode from the vnode status.
70 */
71static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key,
72 struct afs_cb_interest *cbi,
73 struct afs_vnode *parent_vnode,
74 struct afs_status_cb *scb)
75{
76 struct afs_cb_interest *old_cbi = NULL;
77 struct afs_file_status *status = &scb->status;
78 struct inode *inode = AFS_VNODE_TO_I(vnode);
79 struct timespec64 t;
80
81 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
82 status->type,
83 status->nlink,
84 (unsigned long long) status->size,
85 status->data_version,
86 status->mode);
87
88 write_seqlock(&vnode->cb_lock);
89
90 vnode->status = *status;
91
92 t = status->mtime_client;
93 inode->i_ctime = t;
94 inode->i_mtime = t;
95 inode->i_atime = t;
96 inode->i_uid = make_kuid(&init_user_ns, status->owner);
97 inode->i_gid = make_kgid(&init_user_ns, status->group);
98 set_nlink(&vnode->vfs_inode, status->nlink);
99
100 switch (status->type) {
101 case AFS_FTYPE_FILE:
102 inode->i_mode = S_IFREG | status->mode;
103 inode->i_op = &afs_file_inode_operations;
104 inode->i_fop = &afs_file_operations;
105 inode->i_mapping->a_ops = &afs_fs_aops;
106 break;
107 case AFS_FTYPE_DIR:
108 inode->i_mode = S_IFDIR | status->mode;
109 inode->i_op = &afs_dir_inode_operations;
110 inode->i_fop = &afs_dir_file_operations;
111 inode->i_mapping->a_ops = &afs_dir_aops;
112 break;
113 case AFS_FTYPE_SYMLINK:
114 /* Symlinks with a mode of 0644 are actually mountpoints. */
115 if ((status->mode & 0777) == 0644) {
116 inode->i_flags |= S_AUTOMOUNT;
117
118 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
119
120 inode->i_mode = S_IFDIR | 0555;
121 inode->i_op = &afs_mntpt_inode_operations;
122 inode->i_fop = &afs_mntpt_file_operations;
123 inode->i_mapping->a_ops = &afs_fs_aops;
124 } else {
125 inode->i_mode = S_IFLNK | status->mode;
126 inode->i_op = &afs_symlink_inode_operations;
127 inode->i_mapping->a_ops = &afs_fs_aops;
128 }
129 inode_nohighmem(inode);
130 break;
131 default:
132 dump_vnode(vnode, parent_vnode);
133 write_sequnlock(&vnode->cb_lock);
134 return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type);
135 }
136
137 afs_set_i_size(vnode, status->size);
138
139 vnode->invalid_before = status->data_version;
140 inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
141
142 if (!scb->have_cb) {
143 /* it's a symlink we just created (the fileserver
144 * didn't give us a callback) */
145 vnode->cb_expires_at = ktime_get_real_seconds();
146 } else {
147 vnode->cb_expires_at = scb->callback.expires_at;
148 old_cbi = rcu_dereference_protected(vnode->cb_interest,
149 lockdep_is_held(&vnode->cb_lock.lock));
150 if (cbi != old_cbi)
151 rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(cbi));
152 else
153 old_cbi = NULL;
154 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
155 }
156
157 write_sequnlock(&vnode->cb_lock);
158 afs_put_cb_interest(afs_v2net(vnode), old_cbi);
159 return 0;
160}
161
162/*
163 * Update the core inode struct from a returned status record.
164 */
165static void afs_apply_status(struct afs_fs_cursor *fc,
166 struct afs_vnode *vnode,
167 struct afs_status_cb *scb,
168 const afs_dataversion_t *expected_version)
169{
170 struct afs_file_status *status = &scb->status;
171 struct timespec64 t;
172 umode_t mode;
173 bool data_changed = false;
174
175 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
176
177 if (status->type != vnode->status.type) {
178 pr_warning("Vnode %llx:%llx:%x changed type %u to %u\n",
179 vnode->fid.vid,
180 vnode->fid.vnode,
181 vnode->fid.unique,
182 status->type, vnode->status.type);
183 afs_protocol_error(NULL, -EBADMSG, afs_eproto_bad_status);
184 return;
185 }
186
187 if (status->nlink != vnode->status.nlink)
188 set_nlink(&vnode->vfs_inode, status->nlink);
189
190 if (status->owner != vnode->status.owner)
191 vnode->vfs_inode.i_uid = make_kuid(&init_user_ns, status->owner);
192
193 if (status->group != vnode->status.group)
194 vnode->vfs_inode.i_gid = make_kgid(&init_user_ns, status->group);
195
196 if (status->mode != vnode->status.mode) {
197 mode = vnode->vfs_inode.i_mode;
198 mode &= ~S_IALLUGO;
199 mode |= status->mode;
200 WRITE_ONCE(vnode->vfs_inode.i_mode, mode);
201 }
202
203 t = status->mtime_client;
204 vnode->vfs_inode.i_ctime = t;
205 vnode->vfs_inode.i_mtime = t;
206 vnode->vfs_inode.i_atime = t;
207
208 if (vnode->status.data_version != status->data_version)
209 data_changed = true;
210
211 vnode->status = *status;
212
213 if (expected_version &&
214 *expected_version != status->data_version) {
215 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags))
216 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s\n",
217 vnode->fid.vid, vnode->fid.vnode,
218 (unsigned long long)*expected_version,
219 (unsigned long long)status->data_version,
220 fc->type ? fc->type->name : "???");
221
222 vnode->invalid_before = status->data_version;
223 if (vnode->status.type == AFS_FTYPE_DIR) {
224 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
225 afs_stat_v(vnode, n_inval);
226 } else {
227 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
228 }
229 } else if (vnode->status.type == AFS_FTYPE_DIR) {
230 /* Expected directory change is handled elsewhere so
231 * that we can locally edit the directory and save on a
232 * download.
233 */
234 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
235 data_changed = false;
236 }
237
238 if (data_changed) {
239 inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
240 afs_set_i_size(vnode, status->size);
241 }
242}
243
244/*
245 * Apply a callback to a vnode.
246 */
247static void afs_apply_callback(struct afs_fs_cursor *fc,
248 struct afs_vnode *vnode,
249 struct afs_status_cb *scb,
250 unsigned int cb_break)
251{
252 struct afs_cb_interest *old;
253 struct afs_callback *cb = &scb->callback;
254
255 if (!afs_cb_is_broken(cb_break, vnode, fc->cbi)) {
256 vnode->cb_expires_at = cb->expires_at;
257 old = rcu_dereference_protected(vnode->cb_interest,
258 lockdep_is_held(&vnode->cb_lock.lock));
259 if (old != fc->cbi) {
260 rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(fc->cbi));
261 afs_put_cb_interest(afs_v2net(vnode), old);
262 }
263 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
264 }
265}
266
267/*
268 * Apply the received status and callback to an inode all in the same critical
269 * section to avoid races with afs_validate().
270 */
271void afs_vnode_commit_status(struct afs_fs_cursor *fc,
272 struct afs_vnode *vnode,
273 unsigned int cb_break,
274 const afs_dataversion_t *expected_version,
275 struct afs_status_cb *scb)
276{
277 if (fc->ac.error != 0)
278 return;
279
280 write_seqlock(&vnode->cb_lock);
281
282 if (scb->have_error) {
283 if (scb->status.abort_code == VNOVNODE) {
284 set_bit(AFS_VNODE_DELETED, &vnode->flags);
285 clear_nlink(&vnode->vfs_inode);
286 __afs_break_callback(vnode, afs_cb_break_for_deleted);
287 }
288 } else {
289 if (scb->have_status)
290 afs_apply_status(fc, vnode, scb, expected_version);
291 if (scb->have_cb)
292 afs_apply_callback(fc, vnode, scb, cb_break);
293 }
294
295 write_sequnlock(&vnode->cb_lock);
296
297 if (fc->ac.error == 0 && scb->have_status)
298 afs_cache_permit(vnode, fc->key, cb_break, scb);
299}
300
301/*
302 * Fetch file status from the volume.
303 */
304int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
305 afs_access_t *_caller_access)
306{
307 struct afs_status_cb *scb;
308 struct afs_fs_cursor fc;
309 int ret;
310
311 _enter("%s,{%llx:%llu.%u,S=%lx}",
312 vnode->volume->name,
313 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
314 vnode->flags);
315
316 scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
317 if (!scb)
318 return -ENOMEM;
319
320 ret = -ERESTARTSYS;
321 if (afs_begin_vnode_operation(&fc, vnode, key, true)) {
322 afs_dataversion_t data_version = vnode->status.data_version;
323
324 while (afs_select_fileserver(&fc)) {
325 fc.cb_break = afs_calc_vnode_cb_break(vnode);
326 afs_fs_fetch_file_status(&fc, scb, NULL);
327 }
328
329 if (fc.error) {
330 /* Do nothing. */
331 } else if (is_new) {
332 ret = afs_inode_init_from_status(vnode, key, fc.cbi,
333 NULL, scb);
334 fc.error = ret;
335 if (ret == 0)
336 afs_cache_permit(vnode, key, fc.cb_break, scb);
337 } else {
338 afs_vnode_commit_status(&fc, vnode, fc.cb_break,
339 &data_version, scb);
340 }
341 afs_check_for_remote_deletion(&fc, vnode);
342 ret = afs_end_vnode_operation(&fc);
343 }
344
345 if (ret == 0 && _caller_access)
346 *_caller_access = scb->status.caller_access;
347 kfree(scb);
348 _leave(" = %d", ret);
349 return ret;
350}
351
352/*
353 * iget5() comparator
354 */
355int afs_iget5_test(struct inode *inode, void *opaque)
356{
357 struct afs_iget_data *iget_data = opaque;
358 struct afs_vnode *vnode = AFS_FS_I(inode);
359
360 return memcmp(&vnode->fid, &iget_data->fid, sizeof(iget_data->fid)) == 0;
361}
362
363/*
364 * iget5() comparator for inode created by autocell operations
365 *
366 * These pseudo inodes don't match anything.
367 */
368static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque)
369{
370 return 0;
371}
372
373/*
374 * iget5() inode initialiser
375 */
376static int afs_iget5_set(struct inode *inode, void *opaque)
377{
378 struct afs_iget_data *iget_data = opaque;
379 struct afs_vnode *vnode = AFS_FS_I(inode);
380
381 vnode->fid = iget_data->fid;
382 vnode->volume = iget_data->volume;
383 vnode->cb_v_break = iget_data->cb_v_break;
384 vnode->cb_s_break = iget_data->cb_s_break;
385
386 /* YFS supports 96-bit vnode IDs, but Linux only supports
387 * 64-bit inode numbers.
388 */
389 inode->i_ino = iget_data->fid.vnode;
390 inode->i_generation = iget_data->fid.unique;
391 return 0;
392}
393
394/*
395 * Create an inode for a dynamic root directory or an autocell dynamic
396 * automount dir.
397 */
398struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
399{
400 struct afs_super_info *as;
401 struct afs_vnode *vnode;
402 struct inode *inode;
403 static atomic_t afs_autocell_ino;
404
405 struct afs_iget_data iget_data = {
406 .cb_v_break = 0,
407 .cb_s_break = 0,
408 };
409
410 _enter("");
411
412 as = sb->s_fs_info;
413 if (as->volume) {
414 iget_data.volume = as->volume;
415 iget_data.fid.vid = as->volume->vid;
416 }
417 if (root) {
418 iget_data.fid.vnode = 1;
419 iget_data.fid.unique = 1;
420 } else {
421 iget_data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
422 iget_data.fid.unique = 0;
423 }
424
425 inode = iget5_locked(sb, iget_data.fid.vnode,
426 afs_iget5_pseudo_dir_test, afs_iget5_set,
427 &iget_data);
428 if (!inode) {
429 _leave(" = -ENOMEM");
430 return ERR_PTR(-ENOMEM);
431 }
432
433 _debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }",
434 inode, inode->i_ino, iget_data.fid.vid, iget_data.fid.vnode,
435 iget_data.fid.unique);
436
437 vnode = AFS_FS_I(inode);
438
439 /* there shouldn't be an existing inode */
440 BUG_ON(!(inode->i_state & I_NEW));
441
442 inode->i_size = 0;
443 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
444 if (root) {
445 inode->i_op = &afs_dynroot_inode_operations;
446 inode->i_fop = &simple_dir_operations;
447 } else {
448 inode->i_op = &afs_autocell_inode_operations;
449 }
450 set_nlink(inode, 2);
451 inode->i_uid = GLOBAL_ROOT_UID;
452 inode->i_gid = GLOBAL_ROOT_GID;
453 inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode);
454 inode->i_blocks = 0;
455 inode_set_iversion_raw(inode, 0);
456 inode->i_generation = 0;
457
458 set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
459 if (!root) {
460 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
461 inode->i_flags |= S_AUTOMOUNT;
462 }
463
464 inode->i_flags |= S_NOATIME;
465 unlock_new_inode(inode);
466 _leave(" = %p", inode);
467 return inode;
468}
469
470/*
471 * Get a cache cookie for an inode.
472 */
473static void afs_get_inode_cache(struct afs_vnode *vnode)
474{
475#ifdef CONFIG_AFS_FSCACHE
476 struct {
477 u32 vnode_id;
478 u32 unique;
479 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
480 } __packed key;
481 struct afs_vnode_cache_aux aux;
482
483 if (vnode->status.type == AFS_FTYPE_DIR) {
484 vnode->cache = NULL;
485 return;
486 }
487
488 key.vnode_id = vnode->fid.vnode;
489 key.unique = vnode->fid.unique;
490 key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
491 key.vnode_id_ext[1] = vnode->fid.vnode_hi;
492 aux.data_version = vnode->status.data_version;
493
494 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
495 &afs_vnode_cache_index_def,
496 &key, sizeof(key),
497 &aux, sizeof(aux),
498 vnode, vnode->status.size, true);
499#endif
500}
501
502/*
503 * inode retrieval
504 */
505struct inode *afs_iget(struct super_block *sb, struct key *key,
506 struct afs_iget_data *iget_data,
507 struct afs_status_cb *scb,
508 struct afs_cb_interest *cbi,
509 struct afs_vnode *parent_vnode)
510{
511 struct afs_super_info *as;
512 struct afs_vnode *vnode;
513 struct afs_fid *fid = &iget_data->fid;
514 struct inode *inode;
515 int ret;
516
517 _enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique);
518
519 as = sb->s_fs_info;
520 iget_data->volume = as->volume;
521
522 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
523 iget_data);
524 if (!inode) {
525 _leave(" = -ENOMEM");
526 return ERR_PTR(-ENOMEM);
527 }
528
529 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
530 inode, fid->vid, fid->vnode, fid->unique);
531
532 vnode = AFS_FS_I(inode);
533
534 /* deal with an existing inode */
535 if (!(inode->i_state & I_NEW)) {
536 _leave(" = %p", inode);
537 return inode;
538 }
539
540 if (!scb) {
541 /* it's a remotely extant inode */
542 ret = afs_fetch_status(vnode, key, true, NULL);
543 if (ret < 0)
544 goto bad_inode;
545 } else {
546 ret = afs_inode_init_from_status(vnode, key, cbi, parent_vnode,
547 scb);
548 if (ret < 0)
549 goto bad_inode;
550 }
551
552 afs_get_inode_cache(vnode);
553
554 /* success */
555 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
556 inode->i_flags |= S_NOATIME;
557 unlock_new_inode(inode);
558 _leave(" = %p", inode);
559 return inode;
560
561 /* failure */
562bad_inode:
563 iget_failed(inode);
564 _leave(" = %d [bad]", ret);
565 return ERR_PTR(ret);
566}
567
568/*
569 * mark the data attached to an inode as obsolete due to a write on the server
570 * - might also want to ditch all the outstanding writes and dirty pages
571 */
572void afs_zap_data(struct afs_vnode *vnode)
573{
574 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
575
576#ifdef CONFIG_AFS_FSCACHE
577 fscache_invalidate(vnode->cache);
578#endif
579
580 /* nuke all the non-dirty pages that aren't locked, mapped or being
581 * written back in a regular file and completely discard the pages in a
582 * directory or symlink */
583 if (S_ISREG(vnode->vfs_inode.i_mode))
584 invalidate_remote_inode(&vnode->vfs_inode);
585 else
586 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
587}
588
589/*
590 * Check the validity of a vnode/inode.
591 */
592bool afs_check_validity(struct afs_vnode *vnode)
593{
594 struct afs_cb_interest *cbi;
595 struct afs_server *server;
596 struct afs_volume *volume = vnode->volume;
597 enum afs_cb_break_reason need_clear = afs_cb_break_no_break;
598 time64_t now = ktime_get_real_seconds();
599 bool valid;
600 unsigned int cb_break, cb_s_break, cb_v_break;
601 int seq = 0;
602
603 do {
604 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
605 cb_v_break = READ_ONCE(volume->cb_v_break);
606 cb_break = vnode->cb_break;
607
608 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
609 cbi = rcu_dereference(vnode->cb_interest);
610 server = rcu_dereference(cbi->server);
611 cb_s_break = READ_ONCE(server->cb_s_break);
612
613 if (vnode->cb_s_break != cb_s_break ||
614 vnode->cb_v_break != cb_v_break) {
615 vnode->cb_s_break = cb_s_break;
616 vnode->cb_v_break = cb_v_break;
617 need_clear = afs_cb_break_for_vsbreak;
618 valid = false;
619 } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
620 need_clear = afs_cb_break_for_zap;
621 valid = false;
622 } else if (vnode->cb_expires_at - 10 <= now) {
623 need_clear = afs_cb_break_for_lapsed;
624 valid = false;
625 } else {
626 valid = true;
627 }
628 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
629 valid = true;
630 } else {
631 vnode->cb_v_break = cb_v_break;
632 valid = false;
633 }
634
635 } while (need_seqretry(&vnode->cb_lock, seq));
636
637 done_seqretry(&vnode->cb_lock, seq);
638
639 if (need_clear != afs_cb_break_no_break) {
640 write_seqlock(&vnode->cb_lock);
641 if (cb_break == vnode->cb_break)
642 __afs_break_callback(vnode, need_clear);
643 else
644 trace_afs_cb_miss(&vnode->fid, need_clear);
645 write_sequnlock(&vnode->cb_lock);
646 valid = false;
647 }
648
649 return valid;
650}
651
652/*
653 * validate a vnode/inode
654 * - there are several things we need to check
655 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
656 * symlink)
657 * - parent dir metadata changed (security changes)
658 * - dentry data changed (write, truncate)
659 * - dentry metadata changed (security changes)
660 */
661int afs_validate(struct afs_vnode *vnode, struct key *key)
662{
663 bool valid;
664 int ret;
665
666 _enter("{v={%llx:%llu} fl=%lx},%x",
667 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
668 key_serial(key));
669
670 rcu_read_lock();
671 valid = afs_check_validity(vnode);
672 rcu_read_unlock();
673
674 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
675 clear_nlink(&vnode->vfs_inode);
676
677 if (valid)
678 goto valid;
679
680 down_write(&vnode->validate_lock);
681
682 /* if the promise has expired, we need to check the server again to get
683 * a new promise - note that if the (parent) directory's metadata was
684 * changed then the security may be different and we may no longer have
685 * access */
686 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
687 _debug("not promised");
688 ret = afs_fetch_status(vnode, key, false, NULL);
689 if (ret < 0) {
690 if (ret == -ENOENT) {
691 set_bit(AFS_VNODE_DELETED, &vnode->flags);
692 ret = -ESTALE;
693 }
694 goto error_unlock;
695 }
696 _debug("new promise [fl=%lx]", vnode->flags);
697 }
698
699 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
700 _debug("file already deleted");
701 ret = -ESTALE;
702 goto error_unlock;
703 }
704
705 /* if the vnode's data version number changed then its contents are
706 * different */
707 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
708 afs_zap_data(vnode);
709 up_write(&vnode->validate_lock);
710valid:
711 _leave(" = 0");
712 return 0;
713
714error_unlock:
715 up_write(&vnode->validate_lock);
716 _leave(" = %d", ret);
717 return ret;
718}
719
720/*
721 * read the attributes of an inode
722 */
723int afs_getattr(const struct path *path, struct kstat *stat,
724 u32 request_mask, unsigned int query_flags)
725{
726 struct inode *inode = d_inode(path->dentry);
727 struct afs_vnode *vnode = AFS_FS_I(inode);
728 int seq = 0;
729
730 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
731
732 do {
733 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
734 generic_fillattr(inode, stat);
735 } while (need_seqretry(&vnode->cb_lock, seq));
736
737 done_seqretry(&vnode->cb_lock, seq);
738 return 0;
739}
740
741/*
742 * discard an AFS inode
743 */
744int afs_drop_inode(struct inode *inode)
745{
746 _enter("");
747
748 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
749 return generic_delete_inode(inode);
750 else
751 return generic_drop_inode(inode);
752}
753
754/*
755 * clear an AFS inode
756 */
757void afs_evict_inode(struct inode *inode)
758{
759 struct afs_cb_interest *cbi;
760 struct afs_vnode *vnode;
761
762 vnode = AFS_FS_I(inode);
763
764 _enter("{%llx:%llu.%d}",
765 vnode->fid.vid,
766 vnode->fid.vnode,
767 vnode->fid.unique);
768
769 _debug("CLEAR INODE %p", inode);
770
771 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
772
773 truncate_inode_pages_final(&inode->i_data);
774 clear_inode(inode);
775
776 write_seqlock(&vnode->cb_lock);
777 cbi = rcu_dereference_protected(vnode->cb_interest,
778 lockdep_is_held(&vnode->cb_lock.lock));
779 if (cbi) {
780 afs_put_cb_interest(afs_i2net(inode), cbi);
781 rcu_assign_pointer(vnode->cb_interest, NULL);
782 }
783 write_sequnlock(&vnode->cb_lock);
784
785 while (!list_empty(&vnode->wb_keys)) {
786 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
787 struct afs_wb_key, vnode_link);
788 list_del(&wbk->vnode_link);
789 afs_put_wb_key(wbk);
790 }
791
792#ifdef CONFIG_AFS_FSCACHE
793 {
794 struct afs_vnode_cache_aux aux;
795
796 aux.data_version = vnode->status.data_version;
797 fscache_relinquish_cookie(vnode->cache, &aux,
798 test_bit(AFS_VNODE_DELETED, &vnode->flags));
799 vnode->cache = NULL;
800 }
801#endif
802
803 afs_prune_wb_keys(vnode);
804 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
805 key_put(vnode->silly_key);
806 vnode->silly_key = NULL;
807 key_put(vnode->lock_key);
808 vnode->lock_key = NULL;
809 _leave("");
810}
811
812/*
813 * set the attributes of an inode
814 */
815int afs_setattr(struct dentry *dentry, struct iattr *attr)
816{
817 struct afs_fs_cursor fc;
818 struct afs_status_cb *scb;
819 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
820 struct key *key;
821 int ret = -ENOMEM;
822
823 _enter("{%llx:%llu},{n=%pd},%x",
824 vnode->fid.vid, vnode->fid.vnode, dentry,
825 attr->ia_valid);
826
827 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
828 ATTR_MTIME))) {
829 _leave(" = 0 [unsupported]");
830 return 0;
831 }
832
833 scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
834 if (!scb)
835 goto error;
836
837 /* flush any dirty data outstanding on a regular file */
838 if (S_ISREG(vnode->vfs_inode.i_mode))
839 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
840
841 if (attr->ia_valid & ATTR_FILE) {
842 key = afs_file_key(attr->ia_file);
843 } else {
844 key = afs_request_key(vnode->volume->cell);
845 if (IS_ERR(key)) {
846 ret = PTR_ERR(key);
847 goto error_scb;
848 }
849 }
850
851 ret = -ERESTARTSYS;
852 if (afs_begin_vnode_operation(&fc, vnode, key, false)) {
853 afs_dataversion_t data_version = vnode->status.data_version;
854
855 if (attr->ia_valid & ATTR_SIZE)
856 data_version++;
857
858 while (afs_select_fileserver(&fc)) {
859 fc.cb_break = afs_calc_vnode_cb_break(vnode);
860 afs_fs_setattr(&fc, attr, scb);
861 }
862
863 afs_check_for_remote_deletion(&fc, vnode);
864 afs_vnode_commit_status(&fc, vnode, fc.cb_break,
865 &data_version, scb);
866 ret = afs_end_vnode_operation(&fc);
867 }
868
869 if (!(attr->ia_valid & ATTR_FILE))
870 key_put(key);
871
872error_scb:
873 kfree(scb);
874error:
875 _leave(" = %d", ret);
876 return ret;
877}