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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, true);
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_check = op->cb_v_break;
89 vnode->status = *status;
90
91 t = status->mtime_client;
92 inode_set_ctime_to_ts(inode, t);
93 inode_set_mtime_to_ts(inode, t);
94 inode_set_atime_to_ts(inode, t);
95 inode->i_flags |= S_NOATIME;
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->netfs.inode, status->nlink);
99
100 switch (status->type) {
101 case AFS_FTYPE_FILE:
102 inode->i_mode = S_IFREG | (status->mode & S_IALLUGO);
103 inode->i_op = &afs_file_inode_operations;
104 inode->i_fop = &afs_file_operations;
105 inode->i_mapping->a_ops = &afs_file_aops;
106 mapping_set_large_folios(inode->i_mapping);
107 break;
108 case AFS_FTYPE_DIR:
109 inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO);
110 inode->i_op = &afs_dir_inode_operations;
111 inode->i_fop = &afs_dir_file_operations;
112 inode->i_mapping->a_ops = &afs_dir_aops;
113 mapping_set_large_folios(inode->i_mapping);
114 break;
115 case AFS_FTYPE_SYMLINK:
116 /* Symlinks with a mode of 0644 are actually mountpoints. */
117 if ((status->mode & 0777) == 0644) {
118 inode->i_flags |= S_AUTOMOUNT;
119
120 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
121
122 inode->i_mode = S_IFDIR | 0555;
123 inode->i_op = &afs_mntpt_inode_operations;
124 inode->i_fop = &afs_mntpt_file_operations;
125 inode->i_mapping->a_ops = &afs_symlink_aops;
126 } else {
127 inode->i_mode = S_IFLNK | status->mode;
128 inode->i_op = &afs_symlink_inode_operations;
129 inode->i_mapping->a_ops = &afs_symlink_aops;
130 }
131 inode_nohighmem(inode);
132 break;
133 default:
134 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL);
135 write_sequnlock(&vnode->cb_lock);
136 return afs_protocol_error(NULL, afs_eproto_file_type);
137 }
138
139 afs_set_i_size(vnode, status->size);
140 afs_set_netfs_context(vnode);
141
142 vnode->invalid_before = status->data_version;
143 inode_set_iversion_raw(&vnode->netfs.inode, status->data_version);
144
145 if (!vp->scb.have_cb) {
146 /* it's a symlink we just created (the fileserver
147 * didn't give us a callback) */
148 atomic64_set(&vnode->cb_expires_at, AFS_NO_CB_PROMISE);
149 } else {
150 vnode->cb_server = op->server;
151 atomic64_set(&vnode->cb_expires_at, vp->scb.callback.expires_at);
152 }
153
154 write_sequnlock(&vnode->cb_lock);
155 return 0;
156}
157
158/*
159 * Update the core inode struct from a returned status record.
160 */
161static void afs_apply_status(struct afs_operation *op,
162 struct afs_vnode_param *vp)
163{
164 struct afs_file_status *status = &vp->scb.status;
165 struct afs_vnode *vnode = vp->vnode;
166 struct inode *inode = &vnode->netfs.inode;
167 struct timespec64 t;
168 umode_t mode;
169 bool unexpected_jump = false;
170 bool data_changed = false;
171 bool change_size = vp->set_size;
172
173 _enter("{%llx:%llu.%u} %s",
174 vp->fid.vid, vp->fid.vnode, vp->fid.unique,
175 op->type ? op->type->name : "???");
176
177 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
178
179 if (status->type != vnode->status.type) {
180 pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n",
181 vnode->fid.vid,
182 vnode->fid.vnode,
183 vnode->fid.unique,
184 status->type, vnode->status.type);
185 afs_protocol_error(NULL, afs_eproto_bad_status);
186 return;
187 }
188
189 if (status->nlink != vnode->status.nlink)
190 set_nlink(inode, status->nlink);
191
192 if (status->owner != vnode->status.owner)
193 inode->i_uid = make_kuid(&init_user_ns, status->owner);
194
195 if (status->group != vnode->status.group)
196 inode->i_gid = make_kgid(&init_user_ns, status->group);
197
198 if (status->mode != vnode->status.mode) {
199 mode = inode->i_mode;
200 mode &= ~S_IALLUGO;
201 mode |= status->mode & S_IALLUGO;
202 WRITE_ONCE(inode->i_mode, mode);
203 }
204
205 t = status->mtime_client;
206 inode_set_mtime_to_ts(inode, t);
207 if (vp->update_ctime)
208 inode_set_ctime_to_ts(inode, op->ctime);
209
210 if (vnode->status.data_version != status->data_version)
211 data_changed = true;
212
213 vnode->status = *status;
214
215 if (vp->dv_before + vp->dv_delta != status->data_version) {
216 if (vnode->cb_ro_snapshot == atomic_read(&vnode->volume->cb_ro_snapshot) &&
217 atomic64_read(&vnode->cb_expires_at) != AFS_NO_CB_PROMISE)
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 data_changed = true;
234 unexpected_jump = true;
235 } else if (vnode->status.type == AFS_FTYPE_DIR) {
236 /* Expected directory change is handled elsewhere so
237 * that we can locally edit the directory and save on a
238 * download.
239 */
240 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
241 data_changed = false;
242 change_size = true;
243 }
244
245 if (data_changed) {
246 inode_set_iversion_raw(inode, status->data_version);
247
248 /* Only update the size if the data version jumped. If the
249 * file is being modified locally, then we might have our own
250 * idea of what the size should be that's not the same as
251 * what's on the server.
252 */
253 vnode->netfs.remote_i_size = status->size;
254 if (change_size || status->size > i_size_read(inode)) {
255 afs_set_i_size(vnode, status->size);
256 if (unexpected_jump)
257 vnode->netfs.zero_point = status->size;
258 inode_set_ctime_to_ts(inode, t);
259 inode_set_atime_to_ts(inode, t);
260 }
261 }
262}
263
264/*
265 * Apply a callback to a vnode.
266 */
267static void afs_apply_callback(struct afs_operation *op,
268 struct afs_vnode_param *vp)
269{
270 struct afs_callback *cb = &vp->scb.callback;
271 struct afs_vnode *vnode = vp->vnode;
272
273 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) {
274 if (op->volume->type == AFSVL_RWVOL)
275 vnode->cb_server = op->server;
276 atomic64_set(&vnode->cb_expires_at, cb->expires_at);
277 }
278}
279
280/*
281 * Apply the received status and callback to an inode all in the same critical
282 * section to avoid races with afs_validate().
283 */
284void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp)
285{
286 struct afs_vnode *vnode = vp->vnode;
287
288 _enter("");
289
290 write_seqlock(&vnode->cb_lock);
291
292 if (vp->scb.have_error) {
293 /* A YFS server will return this from RemoveFile2 and AFS and
294 * YFS will return this from InlineBulkStatus.
295 */
296 if (vp->scb.status.abort_code == VNOVNODE) {
297 set_bit(AFS_VNODE_DELETED, &vnode->flags);
298 clear_nlink(&vnode->netfs.inode);
299 __afs_break_callback(vnode, afs_cb_break_for_deleted);
300 op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
301 }
302 } else if (vp->scb.have_status) {
303 if (vp->speculative &&
304 (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) ||
305 vp->dv_before != vnode->status.data_version))
306 /* Ignore the result of a speculative bulk status fetch
307 * if it splits around a modification op, thereby
308 * appearing to regress the data version.
309 */
310 goto out;
311 afs_apply_status(op, vp);
312 if (vp->scb.have_cb)
313 afs_apply_callback(op, vp);
314 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
315 drop_nlink(&vnode->netfs.inode);
316 if (vnode->netfs.inode.i_nlink == 0) {
317 set_bit(AFS_VNODE_DELETED, &vnode->flags);
318 __afs_break_callback(vnode, afs_cb_break_for_deleted);
319 }
320 }
321
322out:
323 write_sequnlock(&vnode->cb_lock);
324
325 if (vp->scb.have_status)
326 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
327}
328
329static void afs_fetch_status_success(struct afs_operation *op)
330{
331 struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
332 struct afs_vnode *vnode = vp->vnode;
333 int ret;
334
335 if (vnode->netfs.inode.i_state & I_NEW) {
336 ret = afs_inode_init_from_status(op, vp, vnode);
337 afs_op_set_error(op, ret);
338 if (ret == 0)
339 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
340 } else {
341 afs_vnode_commit_status(op, vp);
342 }
343}
344
345const struct afs_operation_ops afs_fetch_status_operation = {
346 .issue_afs_rpc = afs_fs_fetch_status,
347 .issue_yfs_rpc = yfs_fs_fetch_status,
348 .success = afs_fetch_status_success,
349 .aborted = afs_check_for_remote_deletion,
350};
351
352/*
353 * Fetch file status from the volume.
354 */
355int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
356 afs_access_t *_caller_access)
357{
358 struct afs_operation *op;
359
360 _enter("%s,{%llx:%llu.%u,S=%lx}",
361 vnode->volume->name,
362 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
363 vnode->flags);
364
365 op = afs_alloc_operation(key, vnode->volume);
366 if (IS_ERR(op))
367 return PTR_ERR(op);
368
369 afs_op_set_vnode(op, 0, vnode);
370
371 op->nr_files = 1;
372 op->ops = &afs_fetch_status_operation;
373 afs_begin_vnode_operation(op);
374 afs_wait_for_operation(op);
375
376 if (_caller_access)
377 *_caller_access = op->file[0].scb.status.caller_access;
378 return afs_put_operation(op);
379}
380
381/*
382 * ilookup() comparator
383 */
384int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque)
385{
386 struct afs_vnode *vnode = AFS_FS_I(inode);
387 struct afs_fid *fid = opaque;
388
389 return (fid->vnode == vnode->fid.vnode &&
390 fid->vnode_hi == vnode->fid.vnode_hi &&
391 fid->unique == vnode->fid.unique);
392}
393
394/*
395 * iget5() comparator
396 */
397static int afs_iget5_test(struct inode *inode, void *opaque)
398{
399 struct afs_vnode_param *vp = opaque;
400 //struct afs_vnode *vnode = AFS_FS_I(inode);
401
402 return afs_ilookup5_test_by_fid(inode, &vp->fid);
403}
404
405/*
406 * iget5() inode initialiser
407 */
408static int afs_iget5_set(struct inode *inode, void *opaque)
409{
410 struct afs_vnode_param *vp = opaque;
411 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
412 struct afs_vnode *vnode = AFS_FS_I(inode);
413
414 vnode->volume = as->volume;
415 vnode->fid = vp->fid;
416
417 /* YFS supports 96-bit vnode IDs, but Linux only supports
418 * 64-bit inode numbers.
419 */
420 inode->i_ino = vnode->fid.vnode;
421 inode->i_generation = vnode->fid.unique;
422 return 0;
423}
424
425/*
426 * Get a cache cookie for an inode.
427 */
428static void afs_get_inode_cache(struct afs_vnode *vnode)
429{
430#ifdef CONFIG_AFS_FSCACHE
431 struct {
432 __be32 vnode_id;
433 __be32 unique;
434 __be32 vnode_id_ext[2]; /* Allow for a 96-bit key */
435 } __packed key;
436 struct afs_vnode_cache_aux aux;
437
438 if (vnode->status.type != AFS_FTYPE_FILE) {
439 vnode->netfs.cache = NULL;
440 return;
441 }
442
443 key.vnode_id = htonl(vnode->fid.vnode);
444 key.unique = htonl(vnode->fid.unique);
445 key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32);
446 key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi);
447 afs_set_cache_aux(vnode, &aux);
448
449 afs_vnode_set_cache(vnode,
450 fscache_acquire_cookie(
451 vnode->volume->cache,
452 vnode->status.type == AFS_FTYPE_FILE ?
453 0 : FSCACHE_ADV_SINGLE_CHUNK,
454 &key, sizeof(key),
455 &aux, sizeof(aux),
456 i_size_read(&vnode->netfs.inode)));
457#endif
458}
459
460/*
461 * inode retrieval
462 */
463struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp)
464{
465 struct afs_vnode_param *dvp = &op->file[0];
466 struct super_block *sb = dvp->vnode->netfs.inode.i_sb;
467 struct afs_vnode *vnode;
468 struct inode *inode;
469 int ret;
470
471 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique);
472
473 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp);
474 if (!inode) {
475 _leave(" = -ENOMEM");
476 return ERR_PTR(-ENOMEM);
477 }
478
479 vnode = AFS_FS_I(inode);
480
481 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
482 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
483
484 /* deal with an existing inode */
485 if (!(inode->i_state & I_NEW)) {
486 _leave(" = %p", inode);
487 return inode;
488 }
489
490 ret = afs_inode_init_from_status(op, vp, vnode);
491 if (ret < 0)
492 goto bad_inode;
493
494 afs_get_inode_cache(vnode);
495
496 /* success */
497 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
498 unlock_new_inode(inode);
499 _leave(" = %p", inode);
500 return inode;
501
502 /* failure */
503bad_inode:
504 iget_failed(inode);
505 _leave(" = %d [bad]", ret);
506 return ERR_PTR(ret);
507}
508
509static int afs_iget5_set_root(struct inode *inode, void *opaque)
510{
511 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
512 struct afs_vnode *vnode = AFS_FS_I(inode);
513
514 vnode->volume = as->volume;
515 vnode->fid.vid = as->volume->vid;
516 vnode->fid.vnode = 1;
517 vnode->fid.unique = 1;
518 inode->i_ino = 1;
519 inode->i_generation = 1;
520 return 0;
521}
522
523/*
524 * Set up the root inode for a volume. This is always vnode 1, unique 1 within
525 * the volume.
526 */
527struct inode *afs_root_iget(struct super_block *sb, struct key *key)
528{
529 struct afs_super_info *as = AFS_FS_S(sb);
530 struct afs_operation *op;
531 struct afs_vnode *vnode;
532 struct inode *inode;
533 int ret;
534
535 _enter(",{%llx},,", as->volume->vid);
536
537 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL);
538 if (!inode) {
539 _leave(" = -ENOMEM");
540 return ERR_PTR(-ENOMEM);
541 }
542
543 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid);
544
545 BUG_ON(!(inode->i_state & I_NEW));
546
547 vnode = AFS_FS_I(inode);
548 vnode->cb_v_check = atomic_read(&as->volume->cb_v_break);
549 afs_set_netfs_context(vnode);
550
551 op = afs_alloc_operation(key, as->volume);
552 if (IS_ERR(op)) {
553 ret = PTR_ERR(op);
554 goto error;
555 }
556
557 afs_op_set_vnode(op, 0, vnode);
558
559 op->nr_files = 1;
560 op->ops = &afs_fetch_status_operation;
561 ret = afs_do_sync_operation(op);
562 if (ret < 0)
563 goto error;
564
565 afs_get_inode_cache(vnode);
566
567 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
568 unlock_new_inode(inode);
569 _leave(" = %p", inode);
570 return inode;
571
572error:
573 iget_failed(inode);
574 _leave(" = %d [bad]", ret);
575 return ERR_PTR(ret);
576}
577
578/*
579 * read the attributes of an inode
580 */
581int afs_getattr(struct mnt_idmap *idmap, const struct path *path,
582 struct kstat *stat, u32 request_mask, unsigned int query_flags)
583{
584 struct inode *inode = d_inode(path->dentry);
585 struct afs_vnode *vnode = AFS_FS_I(inode);
586 struct key *key;
587 int ret, seq;
588
589 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
590
591 if (vnode->volume &&
592 !(query_flags & AT_STATX_DONT_SYNC) &&
593 atomic64_read(&vnode->cb_expires_at) == AFS_NO_CB_PROMISE) {
594 key = afs_request_key(vnode->volume->cell);
595 if (IS_ERR(key))
596 return PTR_ERR(key);
597 ret = afs_validate(vnode, key);
598 key_put(key);
599 if (ret < 0)
600 return ret;
601 }
602
603 do {
604 seq = read_seqbegin(&vnode->cb_lock);
605 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
606 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
607 stat->nlink > 0)
608 stat->nlink -= 1;
609
610 /* Lie about the size of directories. We maintain a locally
611 * edited copy and may make different allocation decisions on
612 * it, but we need to give userspace the server's size.
613 */
614 if (S_ISDIR(inode->i_mode))
615 stat->size = vnode->netfs.remote_i_size;
616 } while (read_seqretry(&vnode->cb_lock, seq));
617
618 return 0;
619}
620
621/*
622 * discard an AFS inode
623 */
624int afs_drop_inode(struct inode *inode)
625{
626 _enter("");
627
628 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
629 return generic_delete_inode(inode);
630 else
631 return generic_drop_inode(inode);
632}
633
634/*
635 * clear an AFS inode
636 */
637void afs_evict_inode(struct inode *inode)
638{
639 struct afs_vnode_cache_aux aux;
640 struct afs_vnode *vnode = AFS_FS_I(inode);
641
642 _enter("{%llx:%llu.%d}",
643 vnode->fid.vid,
644 vnode->fid.vnode,
645 vnode->fid.unique);
646
647 _debug("CLEAR INODE %p", inode);
648
649 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
650
651 netfs_wait_for_outstanding_io(inode);
652 truncate_inode_pages_final(&inode->i_data);
653
654 afs_set_cache_aux(vnode, &aux);
655 netfs_clear_inode_writeback(inode, &aux);
656 clear_inode(inode);
657
658 while (!list_empty(&vnode->wb_keys)) {
659 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
660 struct afs_wb_key, vnode_link);
661 list_del(&wbk->vnode_link);
662 afs_put_wb_key(wbk);
663 }
664
665 fscache_relinquish_cookie(afs_vnode_cache(vnode),
666 test_bit(AFS_VNODE_DELETED, &vnode->flags));
667
668 afs_prune_wb_keys(vnode);
669 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
670 key_put(vnode->silly_key);
671 vnode->silly_key = NULL;
672 key_put(vnode->lock_key);
673 vnode->lock_key = NULL;
674 _leave("");
675}
676
677static void afs_setattr_success(struct afs_operation *op)
678{
679 struct afs_vnode_param *vp = &op->file[0];
680 struct inode *inode = &vp->vnode->netfs.inode;
681 loff_t old_i_size = i_size_read(inode);
682
683 op->setattr.old_i_size = old_i_size;
684 afs_vnode_commit_status(op, vp);
685 /* inode->i_size has now been changed. */
686
687 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
688 loff_t size = op->setattr.attr->ia_size;
689 if (size > old_i_size)
690 pagecache_isize_extended(inode, old_i_size, size);
691 }
692}
693
694static void afs_setattr_edit_file(struct afs_operation *op)
695{
696 struct afs_vnode_param *vp = &op->file[0];
697 struct afs_vnode *vnode = vp->vnode;
698 struct inode *inode = &vnode->netfs.inode;
699
700 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
701 loff_t size = op->setattr.attr->ia_size;
702 loff_t old = op->setattr.old_i_size;
703
704 /* Note: inode->i_size was updated by afs_apply_status() inside
705 * the I/O and callback locks.
706 */
707
708 if (size != old) {
709 truncate_pagecache(inode, size);
710 netfs_resize_file(&vnode->netfs, size, true);
711 fscache_resize_cookie(afs_vnode_cache(vnode), size);
712 }
713 }
714}
715
716static const struct afs_operation_ops afs_setattr_operation = {
717 .issue_afs_rpc = afs_fs_setattr,
718 .issue_yfs_rpc = yfs_fs_setattr,
719 .success = afs_setattr_success,
720 .edit_dir = afs_setattr_edit_file,
721};
722
723/*
724 * set the attributes of an inode
725 */
726int afs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
727 struct iattr *attr)
728{
729 const unsigned int supported =
730 ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
731 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH;
732 struct afs_operation *op;
733 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
734 struct inode *inode = &vnode->netfs.inode;
735 loff_t i_size;
736 int ret;
737
738 _enter("{%llx:%llu},{n=%pd},%x",
739 vnode->fid.vid, vnode->fid.vnode, dentry,
740 attr->ia_valid);
741
742 if (!(attr->ia_valid & supported)) {
743 _leave(" = 0 [unsupported]");
744 return 0;
745 }
746
747 i_size = i_size_read(inode);
748 if (attr->ia_valid & ATTR_SIZE) {
749 if (!S_ISREG(inode->i_mode))
750 return -EISDIR;
751
752 ret = inode_newsize_ok(inode, attr->ia_size);
753 if (ret)
754 return ret;
755
756 if (attr->ia_size == i_size)
757 attr->ia_valid &= ~ATTR_SIZE;
758 }
759
760 fscache_use_cookie(afs_vnode_cache(vnode), true);
761
762 /* Prevent any new writebacks from starting whilst we do this. */
763 down_write(&vnode->validate_lock);
764
765 if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) {
766 loff_t size = attr->ia_size;
767
768 /* Wait for any outstanding writes to the server to complete */
769 loff_t from = min(size, i_size);
770 loff_t to = max(size, i_size);
771 ret = filemap_fdatawait_range(inode->i_mapping, from, to);
772 if (ret < 0)
773 goto out_unlock;
774
775 /* Don't talk to the server if we're just shortening in-memory
776 * writes that haven't gone to the server yet.
777 */
778 if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) &&
779 attr->ia_size < i_size &&
780 attr->ia_size > vnode->netfs.remote_i_size) {
781 truncate_setsize(inode, attr->ia_size);
782 netfs_resize_file(&vnode->netfs, size, false);
783 fscache_resize_cookie(afs_vnode_cache(vnode),
784 attr->ia_size);
785 ret = 0;
786 goto out_unlock;
787 }
788 }
789
790 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
791 afs_file_key(attr->ia_file) : NULL),
792 vnode->volume);
793 if (IS_ERR(op)) {
794 ret = PTR_ERR(op);
795 goto out_unlock;
796 }
797
798 afs_op_set_vnode(op, 0, vnode);
799 op->setattr.attr = attr;
800
801 if (attr->ia_valid & ATTR_SIZE) {
802 op->file[0].dv_delta = 1;
803 op->file[0].set_size = true;
804 }
805 op->ctime = attr->ia_ctime;
806 op->file[0].update_ctime = 1;
807 op->file[0].modification = true;
808
809 op->ops = &afs_setattr_operation;
810 ret = afs_do_sync_operation(op);
811
812out_unlock:
813 up_write(&vnode->validate_lock);
814 fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
815 _leave(" = %d", ret);
816 return ret;
817}
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", vnode->status.type);
38 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
39 vnode->status.abort_code,
40 vnode->status.mode,
41 vnode->status.size,
42 vnode->status.data_version);
43 pr_warn("kAFS: vnode %llx:%llx:%x\n",
44 vnode->fid.vid,
45 vnode->fid.vnode,
46 vnode->fid.unique);
47 if (parent_vnode)
48 pr_warn("kAFS: dir %llx:%llx:%x\n",
49 parent_vnode->fid.vid,
50 parent_vnode->fid.vnode,
51 parent_vnode->fid.unique);
52
53 if (!test_and_set_bit(0, &once_only))
54 dump_stack();
55}
56
57/*
58 * Set the file size and block count. Estimate the number of 512 bytes blocks
59 * used, rounded up to nearest 1K for consistency with other AFS clients.
60 */
61static void afs_set_i_size(struct afs_vnode *vnode, u64 size)
62{
63 i_size_write(&vnode->vfs_inode, size);
64 vnode->vfs_inode.i_blocks = ((size + 1023) >> 10) << 1;
65}
66
67/*
68 * Initialise an inode from the vnode status.
69 */
70static int afs_inode_init_from_status(struct afs_operation *op,
71 struct afs_vnode_param *vp,
72 struct afs_vnode *vnode)
73{
74 struct afs_file_status *status = &vp->scb.status;
75 struct inode *inode = AFS_VNODE_TO_I(vnode);
76 struct timespec64 t;
77
78 _enter("{%llx:%llu.%u} %s",
79 vp->fid.vid, vp->fid.vnode, vp->fid.unique,
80 op->type ? op->type->name : "???");
81
82 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
83 status->type,
84 status->nlink,
85 (unsigned long long) status->size,
86 status->data_version,
87 status->mode);
88
89 write_seqlock(&vnode->cb_lock);
90
91 vnode->cb_v_break = op->cb_v_break;
92 vnode->cb_s_break = op->cb_s_break;
93 vnode->status = *status;
94
95 t = status->mtime_client;
96 inode->i_ctime = t;
97 inode->i_mtime = t;
98 inode->i_atime = t;
99 inode->i_flags |= S_NOATIME;
100 inode->i_uid = make_kuid(&init_user_ns, status->owner);
101 inode->i_gid = make_kgid(&init_user_ns, status->group);
102 set_nlink(&vnode->vfs_inode, status->nlink);
103
104 switch (status->type) {
105 case AFS_FTYPE_FILE:
106 inode->i_mode = S_IFREG | status->mode;
107 inode->i_op = &afs_file_inode_operations;
108 inode->i_fop = &afs_file_operations;
109 inode->i_mapping->a_ops = &afs_fs_aops;
110 break;
111 case AFS_FTYPE_DIR:
112 inode->i_mode = S_IFDIR | status->mode;
113 inode->i_op = &afs_dir_inode_operations;
114 inode->i_fop = &afs_dir_file_operations;
115 inode->i_mapping->a_ops = &afs_dir_aops;
116 break;
117 case AFS_FTYPE_SYMLINK:
118 /* Symlinks with a mode of 0644 are actually mountpoints. */
119 if ((status->mode & 0777) == 0644) {
120 inode->i_flags |= S_AUTOMOUNT;
121
122 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
123
124 inode->i_mode = S_IFDIR | 0555;
125 inode->i_op = &afs_mntpt_inode_operations;
126 inode->i_fop = &afs_mntpt_file_operations;
127 inode->i_mapping->a_ops = &afs_fs_aops;
128 } else {
129 inode->i_mode = S_IFLNK | status->mode;
130 inode->i_op = &afs_symlink_inode_operations;
131 inode->i_mapping->a_ops = &afs_fs_aops;
132 }
133 inode_nohighmem(inode);
134 break;
135 default:
136 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL);
137 write_sequnlock(&vnode->cb_lock);
138 return afs_protocol_error(NULL, afs_eproto_file_type);
139 }
140
141 afs_set_i_size(vnode, status->size);
142
143 vnode->invalid_before = status->data_version;
144 inode_set_iversion_raw(&vnode->vfs_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->vfs_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;
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\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
224 vnode->invalid_before = status->data_version;
225 if (vnode->status.type == AFS_FTYPE_DIR) {
226 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
227 afs_stat_v(vnode, n_inval);
228 } else {
229 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
230 }
231 change_size = true;
232 } else if (vnode->status.type == AFS_FTYPE_DIR) {
233 /* Expected directory change is handled elsewhere so
234 * that we can locally edit the directory and save on a
235 * download.
236 */
237 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
238 data_changed = false;
239 change_size = true;
240 }
241
242 if (data_changed) {
243 inode_set_iversion_raw(inode, status->data_version);
244
245 /* Only update the size if the data version jumped. If the
246 * file is being modified locally, then we might have our own
247 * idea of what the size should be that's not the same as
248 * what's on the server.
249 */
250 if (change_size) {
251 afs_set_i_size(vnode, status->size);
252 inode->i_ctime = t;
253 inode->i_atime = t;
254 }
255 }
256}
257
258/*
259 * Apply a callback to a vnode.
260 */
261static void afs_apply_callback(struct afs_operation *op,
262 struct afs_vnode_param *vp)
263{
264 struct afs_callback *cb = &vp->scb.callback;
265 struct afs_vnode *vnode = vp->vnode;
266
267 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) {
268 vnode->cb_expires_at = cb->expires_at;
269 vnode->cb_server = op->server;
270 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
271 }
272}
273
274/*
275 * Apply the received status and callback to an inode all in the same critical
276 * section to avoid races with afs_validate().
277 */
278void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp)
279{
280 struct afs_vnode *vnode = vp->vnode;
281
282 _enter("");
283
284 write_seqlock(&vnode->cb_lock);
285
286 if (vp->scb.have_error) {
287 /* A YFS server will return this from RemoveFile2 and AFS and
288 * YFS will return this from InlineBulkStatus.
289 */
290 if (vp->scb.status.abort_code == VNOVNODE) {
291 set_bit(AFS_VNODE_DELETED, &vnode->flags);
292 clear_nlink(&vnode->vfs_inode);
293 __afs_break_callback(vnode, afs_cb_break_for_deleted);
294 op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
295 }
296 } else if (vp->scb.have_status) {
297 afs_apply_status(op, vp);
298 if (vp->scb.have_cb)
299 afs_apply_callback(op, vp);
300 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
301 drop_nlink(&vnode->vfs_inode);
302 if (vnode->vfs_inode.i_nlink == 0) {
303 set_bit(AFS_VNODE_DELETED, &vnode->flags);
304 __afs_break_callback(vnode, afs_cb_break_for_deleted);
305 }
306 }
307
308 write_sequnlock(&vnode->cb_lock);
309
310 if (vp->scb.have_status)
311 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
312}
313
314static void afs_fetch_status_success(struct afs_operation *op)
315{
316 struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
317 struct afs_vnode *vnode = vp->vnode;
318 int ret;
319
320 if (vnode->vfs_inode.i_state & I_NEW) {
321 ret = afs_inode_init_from_status(op, vp, vnode);
322 op->error = ret;
323 if (ret == 0)
324 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
325 } else {
326 afs_vnode_commit_status(op, vp);
327 }
328}
329
330const struct afs_operation_ops afs_fetch_status_operation = {
331 .issue_afs_rpc = afs_fs_fetch_status,
332 .issue_yfs_rpc = yfs_fs_fetch_status,
333 .success = afs_fetch_status_success,
334 .aborted = afs_check_for_remote_deletion,
335};
336
337/*
338 * Fetch file status from the volume.
339 */
340int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
341 afs_access_t *_caller_access)
342{
343 struct afs_operation *op;
344
345 _enter("%s,{%llx:%llu.%u,S=%lx}",
346 vnode->volume->name,
347 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
348 vnode->flags);
349
350 op = afs_alloc_operation(key, vnode->volume);
351 if (IS_ERR(op))
352 return PTR_ERR(op);
353
354 afs_op_set_vnode(op, 0, vnode);
355
356 op->nr_files = 1;
357 op->ops = &afs_fetch_status_operation;
358 afs_begin_vnode_operation(op);
359 afs_wait_for_operation(op);
360
361 if (_caller_access)
362 *_caller_access = op->file[0].scb.status.caller_access;
363 return afs_put_operation(op);
364}
365
366/*
367 * ilookup() comparator
368 */
369int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque)
370{
371 struct afs_vnode *vnode = AFS_FS_I(inode);
372 struct afs_fid *fid = opaque;
373
374 return (fid->vnode == vnode->fid.vnode &&
375 fid->vnode_hi == vnode->fid.vnode_hi &&
376 fid->unique == vnode->fid.unique);
377}
378
379/*
380 * iget5() comparator
381 */
382static int afs_iget5_test(struct inode *inode, void *opaque)
383{
384 struct afs_vnode_param *vp = opaque;
385 //struct afs_vnode *vnode = AFS_FS_I(inode);
386
387 return afs_ilookup5_test_by_fid(inode, &vp->fid);
388}
389
390/*
391 * iget5() inode initialiser
392 */
393static int afs_iget5_set(struct inode *inode, void *opaque)
394{
395 struct afs_vnode_param *vp = opaque;
396 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
397 struct afs_vnode *vnode = AFS_FS_I(inode);
398
399 vnode->volume = as->volume;
400 vnode->fid = vp->fid;
401
402 /* YFS supports 96-bit vnode IDs, but Linux only supports
403 * 64-bit inode numbers.
404 */
405 inode->i_ino = vnode->fid.vnode;
406 inode->i_generation = vnode->fid.unique;
407 return 0;
408}
409
410/*
411 * Get a cache cookie for an inode.
412 */
413static void afs_get_inode_cache(struct afs_vnode *vnode)
414{
415#ifdef CONFIG_AFS_FSCACHE
416 struct {
417 u32 vnode_id;
418 u32 unique;
419 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
420 } __packed key;
421 struct afs_vnode_cache_aux aux;
422
423 if (vnode->status.type == AFS_FTYPE_DIR) {
424 vnode->cache = NULL;
425 return;
426 }
427
428 key.vnode_id = vnode->fid.vnode;
429 key.unique = vnode->fid.unique;
430 key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
431 key.vnode_id_ext[1] = vnode->fid.vnode_hi;
432 aux.data_version = vnode->status.data_version;
433
434 vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
435 &afs_vnode_cache_index_def,
436 &key, sizeof(key),
437 &aux, sizeof(aux),
438 vnode, vnode->status.size, true);
439#endif
440}
441
442/*
443 * inode retrieval
444 */
445struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp)
446{
447 struct afs_vnode_param *dvp = &op->file[0];
448 struct super_block *sb = dvp->vnode->vfs_inode.i_sb;
449 struct afs_vnode *vnode;
450 struct inode *inode;
451 int ret;
452
453 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique);
454
455 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp);
456 if (!inode) {
457 _leave(" = -ENOMEM");
458 return ERR_PTR(-ENOMEM);
459 }
460
461 vnode = AFS_FS_I(inode);
462
463 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
464 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
465
466 /* deal with an existing inode */
467 if (!(inode->i_state & I_NEW)) {
468 _leave(" = %p", inode);
469 return inode;
470 }
471
472 ret = afs_inode_init_from_status(op, vp, vnode);
473 if (ret < 0)
474 goto bad_inode;
475
476 afs_get_inode_cache(vnode);
477
478 /* success */
479 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
480 unlock_new_inode(inode);
481 _leave(" = %p", inode);
482 return inode;
483
484 /* failure */
485bad_inode:
486 iget_failed(inode);
487 _leave(" = %d [bad]", ret);
488 return ERR_PTR(ret);
489}
490
491static int afs_iget5_set_root(struct inode *inode, void *opaque)
492{
493 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
494 struct afs_vnode *vnode = AFS_FS_I(inode);
495
496 vnode->volume = as->volume;
497 vnode->fid.vid = as->volume->vid,
498 vnode->fid.vnode = 1;
499 vnode->fid.unique = 1;
500 inode->i_ino = 1;
501 inode->i_generation = 1;
502 return 0;
503}
504
505/*
506 * Set up the root inode for a volume. This is always vnode 1, unique 1 within
507 * the volume.
508 */
509struct inode *afs_root_iget(struct super_block *sb, struct key *key)
510{
511 struct afs_super_info *as = AFS_FS_S(sb);
512 struct afs_operation *op;
513 struct afs_vnode *vnode;
514 struct inode *inode;
515 int ret;
516
517 _enter(",{%llx},,", as->volume->vid);
518
519 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL);
520 if (!inode) {
521 _leave(" = -ENOMEM");
522 return ERR_PTR(-ENOMEM);
523 }
524
525 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid);
526
527 BUG_ON(!(inode->i_state & I_NEW));
528
529 vnode = AFS_FS_I(inode);
530 vnode->cb_v_break = as->volume->cb_v_break,
531
532 op = afs_alloc_operation(key, as->volume);
533 if (IS_ERR(op)) {
534 ret = PTR_ERR(op);
535 goto error;
536 }
537
538 afs_op_set_vnode(op, 0, vnode);
539
540 op->nr_files = 1;
541 op->ops = &afs_fetch_status_operation;
542 ret = afs_do_sync_operation(op);
543 if (ret < 0)
544 goto error;
545
546 afs_get_inode_cache(vnode);
547
548 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
549 unlock_new_inode(inode);
550 _leave(" = %p", inode);
551 return inode;
552
553error:
554 iget_failed(inode);
555 _leave(" = %d [bad]", ret);
556 return ERR_PTR(ret);
557}
558
559/*
560 * mark the data attached to an inode as obsolete due to a write on the server
561 * - might also want to ditch all the outstanding writes and dirty pages
562 */
563static void afs_zap_data(struct afs_vnode *vnode)
564{
565 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
566
567#ifdef CONFIG_AFS_FSCACHE
568 fscache_invalidate(vnode->cache);
569#endif
570
571 /* nuke all the non-dirty pages that aren't locked, mapped or being
572 * written back in a regular file and completely discard the pages in a
573 * directory or symlink */
574 if (S_ISREG(vnode->vfs_inode.i_mode))
575 invalidate_remote_inode(&vnode->vfs_inode);
576 else
577 invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
578}
579
580/*
581 * Get the server reinit counter for a vnode's current server.
582 */
583static bool afs_get_s_break_rcu(struct afs_vnode *vnode, unsigned int *_s_break)
584{
585 struct afs_server_list *slist = rcu_dereference(vnode->volume->servers);
586 struct afs_server *server;
587 int i;
588
589 for (i = 0; i < slist->nr_servers; i++) {
590 server = slist->servers[i].server;
591 if (server == vnode->cb_server) {
592 *_s_break = READ_ONCE(server->cb_s_break);
593 return true;
594 }
595 }
596
597 return false;
598}
599
600/*
601 * Check the validity of a vnode/inode.
602 */
603bool afs_check_validity(struct afs_vnode *vnode)
604{
605 struct afs_volume *volume = vnode->volume;
606 enum afs_cb_break_reason need_clear = afs_cb_break_no_break;
607 time64_t now = ktime_get_real_seconds();
608 bool valid;
609 unsigned int cb_break, cb_s_break, cb_v_break;
610 int seq = 0;
611
612 do {
613 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
614 cb_v_break = READ_ONCE(volume->cb_v_break);
615 cb_break = vnode->cb_break;
616
617 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) &&
618 afs_get_s_break_rcu(vnode, &cb_s_break)) {
619 if (vnode->cb_s_break != cb_s_break ||
620 vnode->cb_v_break != cb_v_break) {
621 vnode->cb_s_break = cb_s_break;
622 vnode->cb_v_break = cb_v_break;
623 need_clear = afs_cb_break_for_vsbreak;
624 valid = false;
625 } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
626 need_clear = afs_cb_break_for_zap;
627 valid = false;
628 } else if (vnode->cb_expires_at - 10 <= now) {
629 need_clear = afs_cb_break_for_lapsed;
630 valid = false;
631 } else {
632 valid = true;
633 }
634 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
635 valid = true;
636 } else {
637 vnode->cb_v_break = cb_v_break;
638 valid = false;
639 }
640
641 } while (need_seqretry(&vnode->cb_lock, seq));
642
643 done_seqretry(&vnode->cb_lock, seq);
644
645 if (need_clear != afs_cb_break_no_break) {
646 write_seqlock(&vnode->cb_lock);
647 if (cb_break == vnode->cb_break)
648 __afs_break_callback(vnode, need_clear);
649 else
650 trace_afs_cb_miss(&vnode->fid, need_clear);
651 write_sequnlock(&vnode->cb_lock);
652 valid = false;
653 }
654
655 return valid;
656}
657
658/*
659 * validate a vnode/inode
660 * - there are several things we need to check
661 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
662 * symlink)
663 * - parent dir metadata changed (security changes)
664 * - dentry data changed (write, truncate)
665 * - dentry metadata changed (security changes)
666 */
667int afs_validate(struct afs_vnode *vnode, struct key *key)
668{
669 bool valid;
670 int ret;
671
672 _enter("{v={%llx:%llu} fl=%lx},%x",
673 vnode->fid.vid, vnode->fid.vnode, vnode->flags,
674 key_serial(key));
675
676 rcu_read_lock();
677 valid = afs_check_validity(vnode);
678 rcu_read_unlock();
679
680 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
681 clear_nlink(&vnode->vfs_inode);
682
683 if (valid)
684 goto valid;
685
686 down_write(&vnode->validate_lock);
687
688 /* if the promise has expired, we need to check the server again to get
689 * a new promise - note that if the (parent) directory's metadata was
690 * changed then the security may be different and we may no longer have
691 * access */
692 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
693 _debug("not promised");
694 ret = afs_fetch_status(vnode, key, false, NULL);
695 if (ret < 0) {
696 if (ret == -ENOENT) {
697 set_bit(AFS_VNODE_DELETED, &vnode->flags);
698 ret = -ESTALE;
699 }
700 goto error_unlock;
701 }
702 _debug("new promise [fl=%lx]", vnode->flags);
703 }
704
705 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
706 _debug("file already deleted");
707 ret = -ESTALE;
708 goto error_unlock;
709 }
710
711 /* if the vnode's data version number changed then its contents are
712 * different */
713 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
714 afs_zap_data(vnode);
715 up_write(&vnode->validate_lock);
716valid:
717 _leave(" = 0");
718 return 0;
719
720error_unlock:
721 up_write(&vnode->validate_lock);
722 _leave(" = %d", ret);
723 return ret;
724}
725
726/*
727 * read the attributes of an inode
728 */
729int afs_getattr(const struct path *path, struct kstat *stat,
730 u32 request_mask, unsigned int query_flags)
731{
732 struct inode *inode = d_inode(path->dentry);
733 struct afs_vnode *vnode = AFS_FS_I(inode);
734 int seq = 0;
735
736 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
737
738 do {
739 read_seqbegin_or_lock(&vnode->cb_lock, &seq);
740 generic_fillattr(inode, stat);
741 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
742 stat->nlink > 0)
743 stat->nlink -= 1;
744 } while (need_seqretry(&vnode->cb_lock, seq));
745
746 done_seqretry(&vnode->cb_lock, seq);
747 return 0;
748}
749
750/*
751 * discard an AFS inode
752 */
753int afs_drop_inode(struct inode *inode)
754{
755 _enter("");
756
757 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
758 return generic_delete_inode(inode);
759 else
760 return generic_drop_inode(inode);
761}
762
763/*
764 * clear an AFS inode
765 */
766void afs_evict_inode(struct inode *inode)
767{
768 struct afs_vnode *vnode;
769
770 vnode = AFS_FS_I(inode);
771
772 _enter("{%llx:%llu.%d}",
773 vnode->fid.vid,
774 vnode->fid.vnode,
775 vnode->fid.unique);
776
777 _debug("CLEAR INODE %p", inode);
778
779 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
780
781 truncate_inode_pages_final(&inode->i_data);
782 clear_inode(inode);
783
784 while (!list_empty(&vnode->wb_keys)) {
785 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
786 struct afs_wb_key, vnode_link);
787 list_del(&wbk->vnode_link);
788 afs_put_wb_key(wbk);
789 }
790
791#ifdef CONFIG_AFS_FSCACHE
792 {
793 struct afs_vnode_cache_aux aux;
794
795 aux.data_version = vnode->status.data_version;
796 fscache_relinquish_cookie(vnode->cache, &aux,
797 test_bit(AFS_VNODE_DELETED, &vnode->flags));
798 vnode->cache = NULL;
799 }
800#endif
801
802 afs_prune_wb_keys(vnode);
803 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
804 key_put(vnode->silly_key);
805 vnode->silly_key = NULL;
806 key_put(vnode->lock_key);
807 vnode->lock_key = NULL;
808 _leave("");
809}
810
811static void afs_setattr_success(struct afs_operation *op)
812{
813 struct afs_vnode_param *vp = &op->file[0];
814 struct inode *inode = &vp->vnode->vfs_inode;
815 loff_t old_i_size = i_size_read(inode);
816
817 op->setattr.old_i_size = old_i_size;
818 afs_vnode_commit_status(op, vp);
819 /* inode->i_size has now been changed. */
820
821 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
822 loff_t size = op->setattr.attr->ia_size;
823 if (size > old_i_size)
824 pagecache_isize_extended(inode, old_i_size, size);
825 }
826}
827
828static void afs_setattr_edit_file(struct afs_operation *op)
829{
830 struct afs_vnode_param *vp = &op->file[0];
831 struct inode *inode = &vp->vnode->vfs_inode;
832
833 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
834 loff_t size = op->setattr.attr->ia_size;
835 loff_t i_size = op->setattr.old_i_size;
836
837 if (size < i_size)
838 truncate_pagecache(inode, size);
839 }
840}
841
842static const struct afs_operation_ops afs_setattr_operation = {
843 .issue_afs_rpc = afs_fs_setattr,
844 .issue_yfs_rpc = yfs_fs_setattr,
845 .success = afs_setattr_success,
846 .edit_dir = afs_setattr_edit_file,
847};
848
849/*
850 * set the attributes of an inode
851 */
852int afs_setattr(struct dentry *dentry, struct iattr *attr)
853{
854 struct afs_operation *op;
855 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
856 int ret;
857
858 _enter("{%llx:%llu},{n=%pd},%x",
859 vnode->fid.vid, vnode->fid.vnode, dentry,
860 attr->ia_valid);
861
862 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
863 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET |
864 ATTR_TOUCH))) {
865 _leave(" = 0 [unsupported]");
866 return 0;
867 }
868
869 if (attr->ia_valid & ATTR_SIZE) {
870 if (!S_ISREG(vnode->vfs_inode.i_mode))
871 return -EISDIR;
872
873 ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size);
874 if (ret)
875 return ret;
876
877 if (attr->ia_size == i_size_read(&vnode->vfs_inode))
878 attr->ia_valid &= ~ATTR_SIZE;
879 }
880
881 /* flush any dirty data outstanding on a regular file */
882 if (S_ISREG(vnode->vfs_inode.i_mode))
883 filemap_write_and_wait(vnode->vfs_inode.i_mapping);
884
885 /* Prevent any new writebacks from starting whilst we do this. */
886 down_write(&vnode->validate_lock);
887
888 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
889 afs_file_key(attr->ia_file) : NULL),
890 vnode->volume);
891 if (IS_ERR(op)) {
892 ret = PTR_ERR(op);
893 goto out_unlock;
894 }
895
896 afs_op_set_vnode(op, 0, vnode);
897 op->setattr.attr = attr;
898
899 if (attr->ia_valid & ATTR_SIZE) {
900 op->file[0].dv_delta = 1;
901 op->file[0].set_size = true;
902 }
903 op->ctime = attr->ia_ctime;
904 op->file[0].update_ctime = 1;
905
906 op->ops = &afs_setattr_operation;
907 ret = afs_do_sync_operation(op);
908
909out_unlock:
910 up_write(&vnode->validate_lock);
911 _leave(" = %d", ret);
912 return ret;
913}