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
28 static const struct inode_operations afs_symlink_inode_operations = {
29 .get_link = page_get_link,
30 };
31
32 static 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 */
59 static 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 */
67 static 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 */
161 static 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 */
267 static 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 */
284 void 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
322 out:
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
329 static 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
345 const 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 */
355 int 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 */
384 int 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 */
397 static 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 */
408 static 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 */
428 static 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 */
463 struct 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 */
503 bad_inode:
504 iget_failed(inode);
505 _leave(" = %d [bad]", ret);
506 return ERR_PTR(ret);
507 }
508
509 static 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 */
527 struct 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
572 error:
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 */
581 int 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 */
624 int 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 */
637 void 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
677 static 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
694 static 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
716 static 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 */
726 int 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
812 out_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 }
818
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.