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
afs_init_new_symlink(struct afs_vnode * vnode,struct afs_operation * op)28 void afs_init_new_symlink(struct afs_vnode *vnode, struct afs_operation *op)
29 {
30 size_t size = strlen(op->create.symlink) + 1;
31 size_t dsize = 0;
32 char *p;
33
34 if (netfs_alloc_folioq_buffer(NULL, &vnode->directory, &dsize, size,
35 mapping_gfp_mask(vnode->netfs.inode.i_mapping)) < 0)
36 return;
37
38 vnode->directory_size = dsize;
39 p = kmap_local_folio(folioq_folio(vnode->directory, 0), 0);
40 memcpy(p, op->create.symlink, size);
41 kunmap_local(p);
42 set_bit(AFS_VNODE_DIR_READ, &vnode->flags);
43 netfs_single_mark_inode_dirty(&vnode->netfs.inode);
44 }
45
afs_put_link(void * arg)46 static void afs_put_link(void *arg)
47 {
48 struct folio *folio = virt_to_folio(arg);
49
50 kunmap_local(arg);
51 folio_put(folio);
52 }
53
afs_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * callback)54 const char *afs_get_link(struct dentry *dentry, struct inode *inode,
55 struct delayed_call *callback)
56 {
57 struct afs_vnode *vnode = AFS_FS_I(inode);
58 struct folio *folio;
59 char *content;
60 ssize_t ret;
61
62 if (!dentry) {
63 /* RCU pathwalk. */
64 if (!test_bit(AFS_VNODE_DIR_READ, &vnode->flags) || !afs_check_validity(vnode))
65 return ERR_PTR(-ECHILD);
66 goto good;
67 }
68
69 if (test_bit(AFS_VNODE_DIR_READ, &vnode->flags))
70 goto fetch;
71
72 ret = afs_validate(vnode, NULL);
73 if (ret < 0)
74 return ERR_PTR(ret);
75
76 if (!test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) &&
77 test_bit(AFS_VNODE_DIR_READ, &vnode->flags))
78 goto good;
79
80 fetch:
81 ret = afs_read_single(vnode, NULL);
82 if (ret < 0)
83 return ERR_PTR(ret);
84 set_bit(AFS_VNODE_DIR_READ, &vnode->flags);
85
86 good:
87 folio = folioq_folio(vnode->directory, 0);
88 folio_get(folio);
89 content = kmap_local_folio(folio, 0);
90 set_delayed_call(callback, afs_put_link, content);
91 return content;
92 }
93
afs_readlink(struct dentry * dentry,char __user * buffer,int buflen)94 int afs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
95 {
96 DEFINE_DELAYED_CALL(done);
97 const char *content;
98 int len;
99
100 content = afs_get_link(dentry, d_inode(dentry), &done);
101 if (IS_ERR(content)) {
102 do_delayed_call(&done);
103 return PTR_ERR(content);
104 }
105
106 len = umin(strlen(content), buflen);
107 if (copy_to_user(buffer, content, len))
108 len = -EFAULT;
109 do_delayed_call(&done);
110 return len;
111 }
112
113 static const struct inode_operations afs_symlink_inode_operations = {
114 .get_link = afs_get_link,
115 .readlink = afs_readlink,
116 };
117
dump_vnode(struct afs_vnode * vnode,struct afs_vnode * parent_vnode)118 static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
119 {
120 static unsigned long once_only;
121
122 pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type);
123 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
124 vnode->status.abort_code,
125 vnode->status.mode,
126 vnode->status.size,
127 vnode->status.data_version);
128 pr_warn("kAFS: vnode %llx:%llx:%x\n",
129 vnode->fid.vid,
130 vnode->fid.vnode,
131 vnode->fid.unique);
132 if (parent_vnode)
133 pr_warn("kAFS: dir %llx:%llx:%x\n",
134 parent_vnode->fid.vid,
135 parent_vnode->fid.vnode,
136 parent_vnode->fid.unique);
137
138 if (!test_and_set_bit(0, &once_only))
139 dump_stack();
140 }
141
142 /*
143 * Set parameters for the netfs library
144 */
afs_set_netfs_context(struct afs_vnode * vnode)145 static void afs_set_netfs_context(struct afs_vnode *vnode)
146 {
147 netfs_inode_init(&vnode->netfs, &afs_req_ops, true);
148 }
149
150 /*
151 * Initialise an inode from the vnode status.
152 */
afs_inode_init_from_status(struct afs_operation * op,struct afs_vnode_param * vp,struct afs_vnode * vnode)153 static int afs_inode_init_from_status(struct afs_operation *op,
154 struct afs_vnode_param *vp,
155 struct afs_vnode *vnode)
156 {
157 struct afs_file_status *status = &vp->scb.status;
158 struct inode *inode = AFS_VNODE_TO_I(vnode);
159 struct timespec64 t;
160
161 _enter("{%llx:%llu.%u} %s",
162 vp->fid.vid, vp->fid.vnode, vp->fid.unique,
163 op->type ? op->type->name : "???");
164
165 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
166 status->type,
167 status->nlink,
168 (unsigned long long) status->size,
169 status->data_version,
170 status->mode);
171
172 write_seqlock(&vnode->cb_lock);
173
174 vnode->cb_v_check = op->cb_v_break;
175 vnode->status = *status;
176
177 t = status->mtime_client;
178 inode_set_ctime_to_ts(inode, t);
179 inode_set_mtime_to_ts(inode, t);
180 inode_set_atime_to_ts(inode, t);
181 inode->i_flags |= S_NOATIME;
182 inode->i_uid = make_kuid(&init_user_ns, status->owner);
183 inode->i_gid = make_kgid(&init_user_ns, status->group);
184 set_nlink(&vnode->netfs.inode, status->nlink);
185
186 switch (status->type) {
187 case AFS_FTYPE_FILE:
188 inode->i_mode = S_IFREG | (status->mode & S_IALLUGO);
189 inode->i_op = &afs_file_inode_operations;
190 inode->i_fop = &afs_file_operations;
191 inode->i_mapping->a_ops = &afs_file_aops;
192 mapping_set_large_folios(inode->i_mapping);
193 break;
194 case AFS_FTYPE_DIR:
195 inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO);
196 inode->i_op = &afs_dir_inode_operations;
197 inode->i_fop = &afs_dir_file_operations;
198 inode->i_mapping->a_ops = &afs_dir_aops;
199 __set_bit(NETFS_ICTX_SINGLE_NO_UPLOAD, &vnode->netfs.flags);
200 /* Assume locally cached directory data will be valid. */
201 __set_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
202 break;
203 case AFS_FTYPE_SYMLINK:
204 /* Symlinks with a mode of 0644 are actually mountpoints. */
205 if ((status->mode & 0777) == 0644) {
206 inode->i_flags |= S_AUTOMOUNT;
207
208 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
209
210 inode->i_mode = S_IFDIR | 0555;
211 inode->i_op = &afs_mntpt_inode_operations;
212 inode->i_fop = &afs_mntpt_file_operations;
213 } else {
214 inode->i_mode = S_IFLNK | status->mode;
215 inode->i_op = &afs_symlink_inode_operations;
216 }
217 inode->i_mapping->a_ops = &afs_dir_aops;
218 inode_nohighmem(inode);
219 mapping_set_release_always(inode->i_mapping);
220 break;
221 default:
222 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL);
223 write_sequnlock(&vnode->cb_lock);
224 return afs_protocol_error(NULL, afs_eproto_file_type);
225 }
226
227 afs_set_i_size(vnode, status->size);
228 afs_set_netfs_context(vnode);
229
230 vnode->invalid_before = status->data_version;
231 trace_afs_set_dv(vnode, status->data_version);
232 inode_set_iversion_raw(&vnode->netfs.inode, status->data_version);
233
234 if (!vp->scb.have_cb) {
235 /* it's a symlink we just created (the fileserver
236 * didn't give us a callback) */
237 afs_clear_cb_promise(vnode, afs_cb_promise_set_new_symlink);
238 } else {
239 vnode->cb_server = op->server;
240 afs_set_cb_promise(vnode, vp->scb.callback.expires_at,
241 afs_cb_promise_set_new_inode);
242 }
243
244 write_sequnlock(&vnode->cb_lock);
245 return 0;
246 }
247
248 /*
249 * Update the core inode struct from a returned status record.
250 */
afs_apply_status(struct afs_operation * op,struct afs_vnode_param * vp)251 static void afs_apply_status(struct afs_operation *op,
252 struct afs_vnode_param *vp)
253 {
254 struct afs_file_status *status = &vp->scb.status;
255 struct afs_vnode *vnode = vp->vnode;
256 struct inode *inode = &vnode->netfs.inode;
257 struct timespec64 t;
258 umode_t mode;
259 bool unexpected_jump = false;
260 bool data_changed = false;
261 bool change_size = vp->set_size;
262
263 _enter("{%llx:%llu.%u} %s",
264 vp->fid.vid, vp->fid.vnode, vp->fid.unique,
265 op->type ? op->type->name : "???");
266
267 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
268
269 if (status->type != vnode->status.type) {
270 pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n",
271 vnode->fid.vid,
272 vnode->fid.vnode,
273 vnode->fid.unique,
274 status->type, vnode->status.type);
275 afs_protocol_error(NULL, afs_eproto_bad_status);
276 return;
277 }
278
279 if (status->nlink != vnode->status.nlink)
280 set_nlink(inode, status->nlink);
281
282 if (status->owner != vnode->status.owner)
283 inode->i_uid = make_kuid(&init_user_ns, status->owner);
284
285 if (status->group != vnode->status.group)
286 inode->i_gid = make_kgid(&init_user_ns, status->group);
287
288 if (status->mode != vnode->status.mode) {
289 mode = inode->i_mode;
290 mode &= ~S_IALLUGO;
291 mode |= status->mode & S_IALLUGO;
292 WRITE_ONCE(inode->i_mode, mode);
293 }
294
295 t = status->mtime_client;
296 inode_set_mtime_to_ts(inode, t);
297 if (vp->update_ctime)
298 inode_set_ctime_to_ts(inode, op->ctime);
299
300 if (vnode->status.data_version != status->data_version) {
301 trace_afs_set_dv(vnode, status->data_version);
302 data_changed = true;
303 }
304
305 vnode->status = *status;
306
307 if (vp->dv_before + vp->dv_delta != status->data_version) {
308 trace_afs_dv_mismatch(vnode, vp->dv_before, vp->dv_delta,
309 status->data_version);
310
311 if (vnode->cb_ro_snapshot == atomic_read(&vnode->volume->cb_ro_snapshot) &&
312 atomic64_read(&vnode->cb_expires_at) != AFS_NO_CB_PROMISE)
313 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s (op=%x)\n",
314 vnode->fid.vid, vnode->fid.vnode,
315 (unsigned long long)vp->dv_before + vp->dv_delta,
316 (unsigned long long)status->data_version,
317 op->type ? op->type->name : "???",
318 op->debug_id);
319
320 vnode->invalid_before = status->data_version;
321 if (vnode->status.type == AFS_FTYPE_DIR)
322 afs_invalidate_dir(vnode, afs_dir_invalid_dv_mismatch);
323 else
324 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
325 change_size = true;
326 data_changed = true;
327 unexpected_jump = true;
328 } else if (vnode->status.type == AFS_FTYPE_DIR) {
329 /* Expected directory change is handled elsewhere so
330 * that we can locally edit the directory and save on a
331 * download.
332 */
333 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
334 data_changed = false;
335 change_size = true;
336 }
337
338 if (data_changed) {
339 inode_set_iversion_raw(inode, status->data_version);
340
341 /* Only update the size if the data version jumped. If the
342 * file is being modified locally, then we might have our own
343 * idea of what the size should be that's not the same as
344 * what's on the server.
345 */
346 vnode->netfs.remote_i_size = status->size;
347 if (change_size || status->size > i_size_read(inode)) {
348 afs_set_i_size(vnode, status->size);
349 if (unexpected_jump)
350 vnode->netfs.zero_point = status->size;
351 inode_set_ctime_to_ts(inode, t);
352 inode_set_atime_to_ts(inode, t);
353 }
354 if (op->ops == &afs_fetch_data_operation)
355 op->fetch.subreq->rreq->i_size = status->size;
356 }
357 }
358
359 /*
360 * Apply a callback to a vnode.
361 */
afs_apply_callback(struct afs_operation * op,struct afs_vnode_param * vp)362 static void afs_apply_callback(struct afs_operation *op,
363 struct afs_vnode_param *vp)
364 {
365 struct afs_callback *cb = &vp->scb.callback;
366 struct afs_vnode *vnode = vp->vnode;
367
368 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) {
369 if (op->volume->type == AFSVL_RWVOL)
370 vnode->cb_server = op->server;
371 afs_set_cb_promise(vnode, cb->expires_at, afs_cb_promise_set_apply_cb);
372 }
373 }
374
375 /*
376 * Apply the received status and callback to an inode all in the same critical
377 * section to avoid races with afs_validate().
378 */
afs_vnode_commit_status(struct afs_operation * op,struct afs_vnode_param * vp)379 void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp)
380 {
381 struct afs_vnode *vnode = vp->vnode;
382
383 _enter("");
384
385 write_seqlock(&vnode->cb_lock);
386
387 if (vp->scb.have_error) {
388 /* A YFS server will return this from RemoveFile2 and AFS and
389 * YFS will return this from InlineBulkStatus.
390 */
391 if (vp->scb.status.abort_code == VNOVNODE) {
392 set_bit(AFS_VNODE_DELETED, &vnode->flags);
393 clear_nlink(&vnode->netfs.inode);
394 __afs_break_callback(vnode, afs_cb_break_for_deleted);
395 op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
396 }
397 } else if (vp->scb.have_status) {
398 if (vp->speculative &&
399 (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) ||
400 vp->dv_before != vnode->status.data_version))
401 /* Ignore the result of a speculative bulk status fetch
402 * if it splits around a modification op, thereby
403 * appearing to regress the data version.
404 */
405 goto out;
406 afs_apply_status(op, vp);
407 if (vp->scb.have_cb)
408 afs_apply_callback(op, vp);
409 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
410 drop_nlink(&vnode->netfs.inode);
411 if (vnode->netfs.inode.i_nlink == 0) {
412 set_bit(AFS_VNODE_DELETED, &vnode->flags);
413 __afs_break_callback(vnode, afs_cb_break_for_deleted);
414 }
415 }
416
417 out:
418 write_sequnlock(&vnode->cb_lock);
419
420 if (vp->scb.have_status)
421 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
422 }
423
afs_fetch_status_success(struct afs_operation * op)424 static void afs_fetch_status_success(struct afs_operation *op)
425 {
426 struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
427 struct afs_vnode *vnode = vp->vnode;
428 int ret;
429
430 if (vnode->netfs.inode.i_state & I_NEW) {
431 ret = afs_inode_init_from_status(op, vp, vnode);
432 afs_op_set_error(op, ret);
433 if (ret == 0)
434 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
435 } else {
436 afs_vnode_commit_status(op, vp);
437 }
438 }
439
440 const struct afs_operation_ops afs_fetch_status_operation = {
441 .issue_afs_rpc = afs_fs_fetch_status,
442 .issue_yfs_rpc = yfs_fs_fetch_status,
443 .success = afs_fetch_status_success,
444 .aborted = afs_check_for_remote_deletion,
445 };
446
447 /*
448 * Fetch file status from the volume.
449 */
afs_fetch_status(struct afs_vnode * vnode,struct key * key,bool is_new,afs_access_t * _caller_access)450 int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
451 afs_access_t *_caller_access)
452 {
453 struct afs_operation *op;
454
455 _enter("%s,{%llx:%llu.%u,S=%lx}",
456 vnode->volume->name,
457 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
458 vnode->flags);
459
460 op = afs_alloc_operation(key, vnode->volume);
461 if (IS_ERR(op))
462 return PTR_ERR(op);
463
464 afs_op_set_vnode(op, 0, vnode);
465
466 op->nr_files = 1;
467 op->ops = &afs_fetch_status_operation;
468 afs_begin_vnode_operation(op);
469 afs_wait_for_operation(op);
470
471 if (_caller_access)
472 *_caller_access = op->file[0].scb.status.caller_access;
473 return afs_put_operation(op);
474 }
475
476 /*
477 * ilookup() comparator
478 */
afs_ilookup5_test_by_fid(struct inode * inode,void * opaque)479 int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque)
480 {
481 struct afs_vnode *vnode = AFS_FS_I(inode);
482 struct afs_fid *fid = opaque;
483
484 return (fid->vnode == vnode->fid.vnode &&
485 fid->vnode_hi == vnode->fid.vnode_hi &&
486 fid->unique == vnode->fid.unique);
487 }
488
489 /*
490 * iget5() comparator
491 */
afs_iget5_test(struct inode * inode,void * opaque)492 static int afs_iget5_test(struct inode *inode, void *opaque)
493 {
494 struct afs_vnode_param *vp = opaque;
495 //struct afs_vnode *vnode = AFS_FS_I(inode);
496
497 return afs_ilookup5_test_by_fid(inode, &vp->fid);
498 }
499
500 /*
501 * iget5() inode initialiser
502 */
afs_iget5_set(struct inode * inode,void * opaque)503 static int afs_iget5_set(struct inode *inode, void *opaque)
504 {
505 struct afs_vnode_param *vp = opaque;
506 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
507 struct afs_vnode *vnode = AFS_FS_I(inode);
508
509 vnode->volume = as->volume;
510 vnode->fid = vp->fid;
511
512 /* YFS supports 96-bit vnode IDs, but Linux only supports
513 * 64-bit inode numbers.
514 */
515 inode->i_ino = vnode->fid.vnode;
516 inode->i_generation = vnode->fid.unique;
517 return 0;
518 }
519
520 /*
521 * Get a cache cookie for an inode.
522 */
afs_get_inode_cache(struct afs_vnode * vnode)523 static void afs_get_inode_cache(struct afs_vnode *vnode)
524 {
525 #ifdef CONFIG_AFS_FSCACHE
526 struct {
527 __be32 vnode_id;
528 __be32 unique;
529 __be32 vnode_id_ext[2]; /* Allow for a 96-bit key */
530 } __packed key;
531 struct afs_vnode_cache_aux aux;
532
533 if (vnode->status.type != AFS_FTYPE_FILE &&
534 vnode->status.type != AFS_FTYPE_DIR &&
535 vnode->status.type != AFS_FTYPE_SYMLINK) {
536 vnode->netfs.cache = NULL;
537 return;
538 }
539
540 key.vnode_id = htonl(vnode->fid.vnode);
541 key.unique = htonl(vnode->fid.unique);
542 key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32);
543 key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi);
544 afs_set_cache_aux(vnode, &aux);
545
546 afs_vnode_set_cache(vnode,
547 fscache_acquire_cookie(
548 vnode->volume->cache,
549 vnode->status.type == AFS_FTYPE_FILE ?
550 0 : FSCACHE_ADV_SINGLE_CHUNK,
551 &key, sizeof(key),
552 &aux, sizeof(aux),
553 i_size_read(&vnode->netfs.inode)));
554 #endif
555 }
556
557 /*
558 * inode retrieval
559 */
afs_iget(struct afs_operation * op,struct afs_vnode_param * vp)560 struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp)
561 {
562 struct afs_vnode_param *dvp = &op->file[0];
563 struct super_block *sb = dvp->vnode->netfs.inode.i_sb;
564 struct afs_vnode *vnode;
565 struct inode *inode;
566 int ret;
567
568 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique);
569
570 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp);
571 if (!inode) {
572 _leave(" = -ENOMEM");
573 return ERR_PTR(-ENOMEM);
574 }
575
576 vnode = AFS_FS_I(inode);
577
578 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
579 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
580
581 /* deal with an existing inode */
582 if (!(inode->i_state & I_NEW)) {
583 _leave(" = %p", inode);
584 return inode;
585 }
586
587 ret = afs_inode_init_from_status(op, vp, vnode);
588 if (ret < 0)
589 goto bad_inode;
590
591 afs_get_inode_cache(vnode);
592
593 /* success */
594 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
595 unlock_new_inode(inode);
596 _leave(" = %p", inode);
597 return inode;
598
599 /* failure */
600 bad_inode:
601 iget_failed(inode);
602 _leave(" = %d [bad]", ret);
603 return ERR_PTR(ret);
604 }
605
afs_iget5_set_root(struct inode * inode,void * opaque)606 static int afs_iget5_set_root(struct inode *inode, void *opaque)
607 {
608 struct afs_super_info *as = AFS_FS_S(inode->i_sb);
609 struct afs_vnode *vnode = AFS_FS_I(inode);
610
611 vnode->volume = as->volume;
612 vnode->fid.vid = as->volume->vid;
613 vnode->fid.vnode = 1;
614 vnode->fid.unique = 1;
615 inode->i_ino = 1;
616 inode->i_generation = 1;
617 return 0;
618 }
619
620 /*
621 * Set up the root inode for a volume. This is always vnode 1, unique 1 within
622 * the volume.
623 */
afs_root_iget(struct super_block * sb,struct key * key)624 struct inode *afs_root_iget(struct super_block *sb, struct key *key)
625 {
626 struct afs_super_info *as = AFS_FS_S(sb);
627 struct afs_operation *op;
628 struct afs_vnode *vnode;
629 struct inode *inode;
630 int ret;
631
632 _enter(",{%llx},,", as->volume->vid);
633
634 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL);
635 if (!inode) {
636 _leave(" = -ENOMEM");
637 return ERR_PTR(-ENOMEM);
638 }
639
640 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid);
641
642 BUG_ON(!(inode->i_state & I_NEW));
643
644 vnode = AFS_FS_I(inode);
645 vnode->cb_v_check = atomic_read(&as->volume->cb_v_break);
646 afs_set_netfs_context(vnode);
647
648 op = afs_alloc_operation(key, as->volume);
649 if (IS_ERR(op)) {
650 ret = PTR_ERR(op);
651 goto error;
652 }
653
654 afs_op_set_vnode(op, 0, vnode);
655
656 op->nr_files = 1;
657 op->ops = &afs_fetch_status_operation;
658 ret = afs_do_sync_operation(op);
659 if (ret < 0)
660 goto error;
661
662 afs_get_inode_cache(vnode);
663
664 clear_bit(AFS_VNODE_UNSET, &vnode->flags);
665 unlock_new_inode(inode);
666 _leave(" = %p", inode);
667 return inode;
668
669 error:
670 iget_failed(inode);
671 _leave(" = %d [bad]", ret);
672 return ERR_PTR(ret);
673 }
674
675 /*
676 * read the attributes of an inode
677 */
afs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)678 int afs_getattr(struct mnt_idmap *idmap, const struct path *path,
679 struct kstat *stat, u32 request_mask, unsigned int query_flags)
680 {
681 struct inode *inode = d_inode(path->dentry);
682 struct afs_vnode *vnode = AFS_FS_I(inode);
683 struct key *key;
684 int ret, seq;
685
686 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
687
688 if (vnode->volume &&
689 !(query_flags & AT_STATX_DONT_SYNC) &&
690 atomic64_read(&vnode->cb_expires_at) == AFS_NO_CB_PROMISE) {
691 key = afs_request_key(vnode->volume->cell);
692 if (IS_ERR(key))
693 return PTR_ERR(key);
694 ret = afs_validate(vnode, key);
695 key_put(key);
696 if (ret < 0)
697 return ret;
698 }
699
700 do {
701 seq = read_seqbegin(&vnode->cb_lock);
702 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
703 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
704 stat->nlink > 0)
705 stat->nlink -= 1;
706
707 /* Lie about the size of directories. We maintain a locally
708 * edited copy and may make different allocation decisions on
709 * it, but we need to give userspace the server's size.
710 */
711 if (S_ISDIR(inode->i_mode))
712 stat->size = vnode->netfs.remote_i_size;
713 } while (read_seqretry(&vnode->cb_lock, seq));
714
715 return 0;
716 }
717
718 /*
719 * discard an AFS inode
720 */
afs_drop_inode(struct inode * inode)721 int afs_drop_inode(struct inode *inode)
722 {
723 _enter("");
724
725 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
726 return generic_delete_inode(inode);
727 else
728 return generic_drop_inode(inode);
729 }
730
731 /*
732 * clear an AFS inode
733 */
afs_evict_inode(struct inode * inode)734 void afs_evict_inode(struct inode *inode)
735 {
736 struct afs_vnode_cache_aux aux;
737 struct afs_super_info *sbi = AFS_FS_S(inode->i_sb);
738 struct afs_vnode *vnode = AFS_FS_I(inode);
739
740 _enter("{%llx:%llu.%d}",
741 vnode->fid.vid,
742 vnode->fid.vnode,
743 vnode->fid.unique);
744
745 _debug("CLEAR INODE %p", inode);
746
747 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
748
749 if ((S_ISDIR(inode->i_mode) ||
750 S_ISLNK(inode->i_mode)) &&
751 (inode->i_state & I_DIRTY) &&
752 !sbi->dyn_root) {
753 struct writeback_control wbc = {
754 .sync_mode = WB_SYNC_ALL,
755 .for_sync = true,
756 .range_end = LLONG_MAX,
757 };
758
759 afs_single_writepages(inode->i_mapping, &wbc);
760 }
761
762 netfs_wait_for_outstanding_io(inode);
763 truncate_inode_pages_final(&inode->i_data);
764 netfs_free_folioq_buffer(vnode->directory);
765
766 afs_set_cache_aux(vnode, &aux);
767 netfs_clear_inode_writeback(inode, &aux);
768 clear_inode(inode);
769
770 while (!list_empty(&vnode->wb_keys)) {
771 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
772 struct afs_wb_key, vnode_link);
773 list_del(&wbk->vnode_link);
774 afs_put_wb_key(wbk);
775 }
776
777 fscache_relinquish_cookie(afs_vnode_cache(vnode),
778 test_bit(AFS_VNODE_DELETED, &vnode->flags));
779
780 afs_prune_wb_keys(vnode);
781 afs_put_permits(rcu_access_pointer(vnode->permit_cache));
782 key_put(vnode->silly_key);
783 vnode->silly_key = NULL;
784 key_put(vnode->lock_key);
785 vnode->lock_key = NULL;
786 _leave("");
787 }
788
afs_setattr_success(struct afs_operation * op)789 static void afs_setattr_success(struct afs_operation *op)
790 {
791 struct afs_vnode_param *vp = &op->file[0];
792 struct inode *inode = &vp->vnode->netfs.inode;
793 loff_t old_i_size = i_size_read(inode);
794
795 op->setattr.old_i_size = old_i_size;
796 afs_vnode_commit_status(op, vp);
797 /* inode->i_size has now been changed. */
798
799 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
800 loff_t size = op->setattr.attr->ia_size;
801 if (size > old_i_size)
802 pagecache_isize_extended(inode, old_i_size, size);
803 }
804 }
805
afs_setattr_edit_file(struct afs_operation * op)806 static void afs_setattr_edit_file(struct afs_operation *op)
807 {
808 struct afs_vnode_param *vp = &op->file[0];
809 struct afs_vnode *vnode = vp->vnode;
810 struct inode *inode = &vnode->netfs.inode;
811
812 if (op->setattr.attr->ia_valid & ATTR_SIZE) {
813 loff_t size = op->setattr.attr->ia_size;
814 loff_t old = op->setattr.old_i_size;
815
816 /* Note: inode->i_size was updated by afs_apply_status() inside
817 * the I/O and callback locks.
818 */
819
820 if (size != old) {
821 truncate_pagecache(inode, size);
822 netfs_resize_file(&vnode->netfs, size, true);
823 fscache_resize_cookie(afs_vnode_cache(vnode), size);
824 }
825 }
826 }
827
828 static const struct afs_operation_ops afs_setattr_operation = {
829 .issue_afs_rpc = afs_fs_setattr,
830 .issue_yfs_rpc = yfs_fs_setattr,
831 .success = afs_setattr_success,
832 .edit_dir = afs_setattr_edit_file,
833 };
834
835 /*
836 * set the attributes of an inode
837 */
afs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)838 int afs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
839 struct iattr *attr)
840 {
841 const unsigned int supported =
842 ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
843 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH;
844 struct afs_operation *op;
845 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
846 struct inode *inode = &vnode->netfs.inode;
847 loff_t i_size;
848 int ret;
849
850 _enter("{%llx:%llu},{n=%pd},%x",
851 vnode->fid.vid, vnode->fid.vnode, dentry,
852 attr->ia_valid);
853
854 if (!(attr->ia_valid & supported)) {
855 _leave(" = 0 [unsupported]");
856 return 0;
857 }
858
859 i_size = i_size_read(inode);
860 if (attr->ia_valid & ATTR_SIZE) {
861 if (!S_ISREG(inode->i_mode))
862 return -EISDIR;
863
864 ret = inode_newsize_ok(inode, attr->ia_size);
865 if (ret)
866 return ret;
867
868 if (attr->ia_size == i_size)
869 attr->ia_valid &= ~ATTR_SIZE;
870 }
871
872 fscache_use_cookie(afs_vnode_cache(vnode), true);
873
874 /* Prevent any new writebacks from starting whilst we do this. */
875 down_write(&vnode->validate_lock);
876
877 if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) {
878 loff_t size = attr->ia_size;
879
880 /* Wait for any outstanding writes to the server to complete */
881 loff_t from = min(size, i_size);
882 loff_t to = max(size, i_size);
883 ret = filemap_fdatawait_range(inode->i_mapping, from, to);
884 if (ret < 0)
885 goto out_unlock;
886
887 /* Don't talk to the server if we're just shortening in-memory
888 * writes that haven't gone to the server yet.
889 */
890 if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) &&
891 attr->ia_size < i_size &&
892 attr->ia_size > vnode->netfs.remote_i_size) {
893 truncate_setsize(inode, attr->ia_size);
894 netfs_resize_file(&vnode->netfs, size, false);
895 fscache_resize_cookie(afs_vnode_cache(vnode),
896 attr->ia_size);
897 ret = 0;
898 goto out_unlock;
899 }
900 }
901
902 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
903 afs_file_key(attr->ia_file) : NULL),
904 vnode->volume);
905 if (IS_ERR(op)) {
906 ret = PTR_ERR(op);
907 goto out_unlock;
908 }
909
910 afs_op_set_vnode(op, 0, vnode);
911 op->setattr.attr = attr;
912
913 if (attr->ia_valid & ATTR_SIZE) {
914 op->file[0].dv_delta = 1;
915 op->file[0].set_size = true;
916 }
917 op->ctime = attr->ia_ctime;
918 op->file[0].update_ctime = 1;
919 op->file[0].modification = true;
920
921 op->ops = &afs_setattr_operation;
922 ret = afs_do_sync_operation(op);
923
924 out_unlock:
925 up_write(&vnode->validate_lock);
926 fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
927 _leave(" = %d", ret);
928 return ret;
929 }
930