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(nr: 0, addr: &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(ctx: &vnode->netfs, ops: &afs_req_ops, use_zero_point: 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(sl: &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, ts: t); |
93 | inode_set_mtime_to_ts(inode, ts: t); |
94 | inode_set_atime_to_ts(inode, ts: t); |
95 | inode->i_flags |= S_NOATIME; |
96 | inode->i_uid = make_kuid(from: &init_user_ns, uid: status->owner); |
97 | inode->i_gid = make_kgid(from: &init_user_ns, gid: status->group); |
98 | set_nlink(inode: &vnode->netfs.inode, nlink: 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(mapping: 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(mapping: 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, addr: &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, parent_vnode: op->file[0].vnode != vnode ? op->file[0].vnode : NULL); |
135 | write_sequnlock(sl: &vnode->cb_lock); |
136 | return afs_protocol_error(NULL, afs_eproto_file_type); |
137 | } |
138 | |
139 | afs_set_i_size(vnode, size: status->size); |
140 | afs_set_netfs_context(vnode); |
141 | |
142 | vnode->invalid_before = status->data_version; |
143 | inode_set_iversion_raw(inode: &vnode->netfs.inode, val: 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(v: &vnode->cb_expires_at, AFS_NO_CB_PROMISE); |
149 | } else { |
150 | vnode->cb_server = op->server; |
151 | atomic64_set(v: &vnode->cb_expires_at, i: vp->scb.callback.expires_at); |
152 | } |
153 | |
154 | write_sequnlock(sl: &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, nlink: status->nlink); |
191 | |
192 | if (status->owner != vnode->status.owner) |
193 | inode->i_uid = make_kuid(from: &init_user_ns, uid: status->owner); |
194 | |
195 | if (status->group != vnode->status.group) |
196 | inode->i_gid = make_kgid(from: &init_user_ns, gid: 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, ts: t); |
207 | if (vp->update_ctime) |
208 | inode_set_ctime_to_ts(inode, ts: 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(v: &vnode->volume->cb_ro_snapshot) && |
217 | atomic64_read(v: &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, addr: &vnode->flags)) |
228 | afs_stat_v(vnode, n_inval); |
229 | } else { |
230 | set_bit(AFS_VNODE_ZAP_DATA, addr: &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, val: 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, size: status->size); |
256 | if (unexpected_jump) |
257 | vnode->netfs.zero_point = status->size; |
258 | inode_set_ctime_to_ts(inode, ts: t); |
259 | inode_set_atime_to_ts(inode, ts: 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(cb_break: vp->cb_break_before, vnode)) { |
274 | if (op->volume->type == AFSVL_RWVOL) |
275 | vnode->cb_server = op->server; |
276 | atomic64_set(v: &vnode->cb_expires_at, i: 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(sl: &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, addr: &vnode->flags); |
298 | clear_nlink(inode: &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(inode: &vnode->netfs.inode); |
316 | if (vnode->netfs.inode.i_nlink == 0) { |
317 | set_bit(AFS_VNODE_DELETED, addr: &vnode->flags); |
318 | __afs_break_callback(vnode, afs_cb_break_for_deleted); |
319 | } |
320 | } |
321 | |
322 | out: |
323 | write_sequnlock(sl: &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, error: 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(ptr: op)) |
367 | return PTR_ERR(ptr: op); |
368 | |
369 | afs_op_set_vnode(op, n: 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, opaque: &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(sb: 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: &aux); |
448 | |
449 | afs_vnode_set_cache(vnode, |
450 | cookie: fscache_acquire_cookie( |
451 | volume: vnode->volume->cache, |
452 | advice: vnode->status.type == AFS_FTYPE_FILE ? |
453 | 0 : FSCACHE_ADV_SINGLE_CHUNK, |
454 | index_key: &key, index_key_len: sizeof(key), |
455 | aux_data: &aux, aux_data_len: sizeof(aux), |
456 | object_size: i_size_read(inode: &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, test: afs_iget5_test, set: afs_iget5_set, vp); |
474 | if (!inode) { |
475 | _leave(" = -ENOMEM" ); |
476 | return ERR_PTR(error: -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, addr: &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(error: 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(sb: 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, set: afs_iget5_set_root, NULL); |
538 | if (!inode) { |
539 | _leave(" = -ENOMEM" ); |
540 | return ERR_PTR(error: -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(v: &as->volume->cb_v_break), |
549 | afs_set_netfs_context(vnode); |
550 | |
551 | op = afs_alloc_operation(key, as->volume); |
552 | if (IS_ERR(ptr: op)) { |
553 | ret = PTR_ERR(ptr: op); |
554 | goto error; |
555 | } |
556 | |
557 | afs_op_set_vnode(op, n: 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, addr: &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(error: 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(dentry: 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(v: &vnode->cb_expires_at) == AFS_NO_CB_PROMISE) { |
594 | key = afs_request_key(vnode->volume->cell); |
595 | if (IS_ERR(ptr: key)) |
596 | return PTR_ERR(ptr: 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(sl: &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(sl: &vnode->cb_lock, start: 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 | truncate_inode_pages_final(&inode->i_data); |
652 | |
653 | afs_set_cache_aux(vnode, aux: &aux); |
654 | netfs_clear_inode_writeback(inode, aux: &aux); |
655 | clear_inode(inode); |
656 | |
657 | while (!list_empty(head: &vnode->wb_keys)) { |
658 | struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, |
659 | struct afs_wb_key, vnode_link); |
660 | list_del(entry: &wbk->vnode_link); |
661 | afs_put_wb_key(wbk); |
662 | } |
663 | |
664 | fscache_relinquish_cookie(cookie: afs_vnode_cache(vnode), |
665 | test_bit(AFS_VNODE_DELETED, &vnode->flags)); |
666 | |
667 | afs_prune_wb_keys(vnode); |
668 | afs_put_permits(rcu_access_pointer(vnode->permit_cache)); |
669 | key_put(key: vnode->silly_key); |
670 | vnode->silly_key = NULL; |
671 | key_put(key: vnode->lock_key); |
672 | vnode->lock_key = NULL; |
673 | _leave("" ); |
674 | } |
675 | |
676 | static void afs_setattr_success(struct afs_operation *op) |
677 | { |
678 | struct afs_vnode_param *vp = &op->file[0]; |
679 | struct inode *inode = &vp->vnode->netfs.inode; |
680 | loff_t old_i_size = i_size_read(inode); |
681 | |
682 | op->setattr.old_i_size = old_i_size; |
683 | afs_vnode_commit_status(op, vp); |
684 | /* inode->i_size has now been changed. */ |
685 | |
686 | if (op->setattr.attr->ia_valid & ATTR_SIZE) { |
687 | loff_t size = op->setattr.attr->ia_size; |
688 | if (size > old_i_size) |
689 | pagecache_isize_extended(inode, from: old_i_size, to: size); |
690 | } |
691 | } |
692 | |
693 | static void afs_setattr_edit_file(struct afs_operation *op) |
694 | { |
695 | struct afs_vnode_param *vp = &op->file[0]; |
696 | struct afs_vnode *vnode = vp->vnode; |
697 | |
698 | if (op->setattr.attr->ia_valid & ATTR_SIZE) { |
699 | loff_t size = op->setattr.attr->ia_size; |
700 | loff_t i_size = op->setattr.old_i_size; |
701 | |
702 | if (size != i_size) { |
703 | truncate_setsize(inode: &vnode->netfs.inode, newsize: size); |
704 | netfs_resize_file(ctx: &vnode->netfs, new_i_size: size, changed_on_server: true); |
705 | fscache_resize_cookie(cookie: afs_vnode_cache(vnode), new_size: size); |
706 | } |
707 | } |
708 | } |
709 | |
710 | static const struct afs_operation_ops afs_setattr_operation = { |
711 | .issue_afs_rpc = afs_fs_setattr, |
712 | .issue_yfs_rpc = yfs_fs_setattr, |
713 | .success = afs_setattr_success, |
714 | .edit_dir = afs_setattr_edit_file, |
715 | }; |
716 | |
717 | /* |
718 | * set the attributes of an inode |
719 | */ |
720 | int afs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, |
721 | struct iattr *attr) |
722 | { |
723 | const unsigned int supported = |
724 | ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | |
725 | ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH; |
726 | struct afs_operation *op; |
727 | struct afs_vnode *vnode = AFS_FS_I(inode: d_inode(dentry)); |
728 | struct inode *inode = &vnode->netfs.inode; |
729 | loff_t i_size; |
730 | int ret; |
731 | |
732 | _enter("{%llx:%llu},{n=%pd},%x" , |
733 | vnode->fid.vid, vnode->fid.vnode, dentry, |
734 | attr->ia_valid); |
735 | |
736 | if (!(attr->ia_valid & supported)) { |
737 | _leave(" = 0 [unsupported]" ); |
738 | return 0; |
739 | } |
740 | |
741 | i_size = i_size_read(inode); |
742 | if (attr->ia_valid & ATTR_SIZE) { |
743 | if (!S_ISREG(inode->i_mode)) |
744 | return -EISDIR; |
745 | |
746 | ret = inode_newsize_ok(inode, offset: attr->ia_size); |
747 | if (ret) |
748 | return ret; |
749 | |
750 | if (attr->ia_size == i_size) |
751 | attr->ia_valid &= ~ATTR_SIZE; |
752 | } |
753 | |
754 | fscache_use_cookie(cookie: afs_vnode_cache(vnode), will_modify: true); |
755 | |
756 | /* Prevent any new writebacks from starting whilst we do this. */ |
757 | down_write(sem: &vnode->validate_lock); |
758 | |
759 | if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) { |
760 | loff_t size = attr->ia_size; |
761 | |
762 | /* Wait for any outstanding writes to the server to complete */ |
763 | loff_t from = min(size, i_size); |
764 | loff_t to = max(size, i_size); |
765 | ret = filemap_fdatawait_range(inode->i_mapping, lstart: from, lend: to); |
766 | if (ret < 0) |
767 | goto out_unlock; |
768 | |
769 | /* Don't talk to the server if we're just shortening in-memory |
770 | * writes that haven't gone to the server yet. |
771 | */ |
772 | if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) && |
773 | attr->ia_size < i_size && |
774 | attr->ia_size > vnode->netfs.remote_i_size) { |
775 | truncate_setsize(inode, newsize: attr->ia_size); |
776 | netfs_resize_file(ctx: &vnode->netfs, new_i_size: size, changed_on_server: false); |
777 | fscache_resize_cookie(cookie: afs_vnode_cache(vnode), |
778 | new_size: attr->ia_size); |
779 | ret = 0; |
780 | goto out_unlock; |
781 | } |
782 | } |
783 | |
784 | op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? |
785 | afs_file_key(file: attr->ia_file) : NULL), |
786 | vnode->volume); |
787 | if (IS_ERR(ptr: op)) { |
788 | ret = PTR_ERR(ptr: op); |
789 | goto out_unlock; |
790 | } |
791 | |
792 | afs_op_set_vnode(op, n: 0, vnode); |
793 | op->setattr.attr = attr; |
794 | |
795 | if (attr->ia_valid & ATTR_SIZE) { |
796 | op->file[0].dv_delta = 1; |
797 | op->file[0].set_size = true; |
798 | } |
799 | op->ctime = attr->ia_ctime; |
800 | op->file[0].update_ctime = 1; |
801 | op->file[0].modification = true; |
802 | |
803 | op->ops = &afs_setattr_operation; |
804 | ret = afs_do_sync_operation(op); |
805 | |
806 | out_unlock: |
807 | up_write(sem: &vnode->validate_lock); |
808 | fscache_unuse_cookie(cookie: afs_vnode_cache(vnode), NULL, NULL); |
809 | _leave(" = %d" , ret); |
810 | return ret; |
811 | } |
812 | |