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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* dir.c: AFS filesystem directory handling
3 *
4 * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#include <linux/kernel.h>
9#include <linux/fs.h>
10#include <linux/namei.h>
11#include <linux/pagemap.h>
12#include <linux/swap.h>
13#include <linux/ctype.h>
14#include <linux/sched.h>
15#include <linux/iversion.h>
16#include <linux/task_io_accounting_ops.h>
17#include "internal.h"
18#include "afs_fs.h"
19#include "xdr_fs.h"
20
21static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
22 unsigned int flags);
23static int afs_dir_open(struct inode *inode, struct file *file);
24static int afs_readdir(struct file *file, struct dir_context *ctx);
25static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
26static int afs_d_delete(const struct dentry *dentry);
27static void afs_d_iput(struct dentry *dentry, struct inode *inode);
28static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
29 loff_t fpos, u64 ino, unsigned dtype);
30static bool afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
31 loff_t fpos, u64 ino, unsigned dtype);
32static int afs_create(struct mnt_idmap *idmap, struct inode *dir,
33 struct dentry *dentry, umode_t mode, bool excl);
34static int afs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
35 struct dentry *dentry, umode_t mode);
36static int afs_rmdir(struct inode *dir, struct dentry *dentry);
37static int afs_unlink(struct inode *dir, struct dentry *dentry);
38static int afs_link(struct dentry *from, struct inode *dir,
39 struct dentry *dentry);
40static int afs_symlink(struct mnt_idmap *idmap, struct inode *dir,
41 struct dentry *dentry, const char *content);
42static int afs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
43 struct dentry *old_dentry, struct inode *new_dir,
44 struct dentry *new_dentry, unsigned int flags);
45static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags);
46static void afs_dir_invalidate_folio(struct folio *folio, size_t offset,
47 size_t length);
48
49static bool afs_dir_dirty_folio(struct address_space *mapping,
50 struct folio *folio)
51{
52 BUG(); /* This should never happen. */
53}
54
55const struct file_operations afs_dir_file_operations = {
56 .open = afs_dir_open,
57 .release = afs_release,
58 .iterate_shared = afs_readdir,
59 .lock = afs_lock,
60 .llseek = generic_file_llseek,
61};
62
63const struct inode_operations afs_dir_inode_operations = {
64 .create = afs_create,
65 .lookup = afs_lookup,
66 .link = afs_link,
67 .unlink = afs_unlink,
68 .symlink = afs_symlink,
69 .mkdir = afs_mkdir,
70 .rmdir = afs_rmdir,
71 .rename = afs_rename,
72 .permission = afs_permission,
73 .getattr = afs_getattr,
74 .setattr = afs_setattr,
75};
76
77const struct address_space_operations afs_dir_aops = {
78 .dirty_folio = afs_dir_dirty_folio,
79 .release_folio = afs_dir_release_folio,
80 .invalidate_folio = afs_dir_invalidate_folio,
81 .migrate_folio = filemap_migrate_folio,
82};
83
84const struct dentry_operations afs_fs_dentry_operations = {
85 .d_revalidate = afs_d_revalidate,
86 .d_delete = afs_d_delete,
87 .d_release = afs_d_release,
88 .d_automount = afs_d_automount,
89 .d_iput = afs_d_iput,
90};
91
92struct afs_lookup_one_cookie {
93 struct dir_context ctx;
94 struct qstr name;
95 bool found;
96 struct afs_fid fid;
97};
98
99struct afs_lookup_cookie {
100 struct dir_context ctx;
101 struct qstr name;
102 bool found;
103 bool one_only;
104 unsigned short nr_fids;
105 struct afs_fid fids[50];
106};
107
108/*
109 * Drop the refs that we're holding on the folios we were reading into. We've
110 * got refs on the first nr_pages pages.
111 */
112static void afs_dir_read_cleanup(struct afs_read *req)
113{
114 struct address_space *mapping = req->vnode->netfs.inode.i_mapping;
115 struct folio *folio;
116 pgoff_t last = req->nr_pages - 1;
117
118 XA_STATE(xas, &mapping->i_pages, 0);
119
120 if (unlikely(!req->nr_pages))
121 return;
122
123 rcu_read_lock();
124 xas_for_each(&xas, folio, last) {
125 if (xas_retry(&xas, folio))
126 continue;
127 BUG_ON(xa_is_value(folio));
128 ASSERTCMP(folio->mapping, ==, mapping);
129
130 folio_put(folio);
131 }
132
133 rcu_read_unlock();
134}
135
136/*
137 * check that a directory folio is valid
138 */
139static bool afs_dir_check_folio(struct afs_vnode *dvnode, struct folio *folio,
140 loff_t i_size)
141{
142 union afs_xdr_dir_block *block;
143 size_t offset, size;
144 loff_t pos;
145
146 /* Determine how many magic numbers there should be in this folio, but
147 * we must take care because the directory may change size under us.
148 */
149 pos = folio_pos(folio);
150 if (i_size <= pos)
151 goto checked;
152
153 size = min_t(loff_t, folio_size(folio), i_size - pos);
154 for (offset = 0; offset < size; offset += sizeof(*block)) {
155 block = kmap_local_folio(folio, offset);
156 if (block->hdr.magic != AFS_DIR_MAGIC) {
157 printk("kAFS: %s(%lx): [%llx] bad magic %zx/%zx is %04hx\n",
158 __func__, dvnode->netfs.inode.i_ino,
159 pos, offset, size, ntohs(block->hdr.magic));
160 trace_afs_dir_check_failed(dvnode, pos + offset, i_size);
161 kunmap_local(block);
162 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
163 goto error;
164 }
165
166 /* Make sure each block is NUL terminated so we can reasonably
167 * use string functions on it. The filenames in the folio
168 * *should* be NUL-terminated anyway.
169 */
170 ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0;
171
172 kunmap_local(block);
173 }
174checked:
175 afs_stat_v(dvnode, n_read_dir);
176 return true;
177
178error:
179 return false;
180}
181
182/*
183 * Dump the contents of a directory.
184 */
185static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req)
186{
187 union afs_xdr_dir_block *block;
188 struct address_space *mapping = dvnode->netfs.inode.i_mapping;
189 struct folio *folio;
190 pgoff_t last = req->nr_pages - 1;
191 size_t offset, size;
192
193 XA_STATE(xas, &mapping->i_pages, 0);
194
195 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n",
196 dvnode->fid.vid, dvnode->fid.vnode,
197 req->file_size, req->len, req->actual_len);
198 pr_warn("DIR %llx %x %zx %zx\n",
199 req->pos, req->nr_pages,
200 req->iter->iov_offset, iov_iter_count(req->iter));
201
202 xas_for_each(&xas, folio, last) {
203 if (xas_retry(&xas, folio))
204 continue;
205
206 BUG_ON(folio->mapping != mapping);
207
208 size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio));
209 for (offset = 0; offset < size; offset += sizeof(*block)) {
210 block = kmap_local_folio(folio, offset);
211 pr_warn("[%02lx] %32phN\n", folio->index + offset, block);
212 kunmap_local(block);
213 }
214 }
215}
216
217/*
218 * Check all the blocks in a directory. All the folios are held pinned.
219 */
220static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req)
221{
222 struct address_space *mapping = dvnode->netfs.inode.i_mapping;
223 struct folio *folio;
224 pgoff_t last = req->nr_pages - 1;
225 int ret = 0;
226
227 XA_STATE(xas, &mapping->i_pages, 0);
228
229 if (unlikely(!req->nr_pages))
230 return 0;
231
232 rcu_read_lock();
233 xas_for_each(&xas, folio, last) {
234 if (xas_retry(&xas, folio))
235 continue;
236
237 BUG_ON(folio->mapping != mapping);
238
239 if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) {
240 afs_dir_dump(dvnode, req);
241 ret = -EIO;
242 break;
243 }
244 }
245
246 rcu_read_unlock();
247 return ret;
248}
249
250/*
251 * open an AFS directory file
252 */
253static int afs_dir_open(struct inode *inode, struct file *file)
254{
255 _enter("{%lu}", inode->i_ino);
256
257 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
258 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
259
260 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
261 return -ENOENT;
262
263 return afs_open(inode, file);
264}
265
266/*
267 * Read the directory into the pagecache in one go, scrubbing the previous
268 * contents. The list of folios is returned, pinning them so that they don't
269 * get reclaimed during the iteration.
270 */
271static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
272 __acquires(&dvnode->validate_lock)
273{
274 struct address_space *mapping = dvnode->netfs.inode.i_mapping;
275 struct afs_read *req;
276 loff_t i_size;
277 int nr_pages, i;
278 int ret;
279 loff_t remote_size = 0;
280
281 _enter("");
282
283 req = kzalloc(sizeof(*req), GFP_KERNEL);
284 if (!req)
285 return ERR_PTR(-ENOMEM);
286
287 refcount_set(&req->usage, 1);
288 req->vnode = dvnode;
289 req->key = key_get(key);
290 req->cleanup = afs_dir_read_cleanup;
291
292expand:
293 i_size = i_size_read(&dvnode->netfs.inode);
294 if (i_size < remote_size)
295 i_size = remote_size;
296 if (i_size < 2048) {
297 ret = afs_bad(dvnode, afs_file_error_dir_small);
298 goto error;
299 }
300 if (i_size > 2048 * 1024) {
301 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
302 ret = -EFBIG;
303 goto error;
304 }
305
306 _enter("%llu", i_size);
307
308 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
309
310 req->actual_len = i_size; /* May change */
311 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
312 req->data_version = dvnode->status.data_version; /* May change */
313 iov_iter_xarray(&req->def_iter, ITER_DEST, &dvnode->netfs.inode.i_mapping->i_pages,
314 0, i_size);
315 req->iter = &req->def_iter;
316
317 /* Fill in any gaps that we might find where the memory reclaimer has
318 * been at work and pin all the folios. If there are any gaps, we will
319 * need to reread the entire directory contents.
320 */
321 i = req->nr_pages;
322 while (i < nr_pages) {
323 struct folio *folio;
324
325 folio = filemap_get_folio(mapping, i);
326 if (IS_ERR(folio)) {
327 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
328 afs_stat_v(dvnode, n_inval);
329 folio = __filemap_get_folio(mapping,
330 i, FGP_LOCK | FGP_CREAT,
331 mapping->gfp_mask);
332 if (IS_ERR(folio)) {
333 ret = PTR_ERR(folio);
334 goto error;
335 }
336 folio_attach_private(folio, (void *)1);
337 folio_unlock(folio);
338 }
339
340 req->nr_pages += folio_nr_pages(folio);
341 i += folio_nr_pages(folio);
342 }
343
344 /* If we're going to reload, we need to lock all the pages to prevent
345 * races.
346 */
347 ret = -ERESTARTSYS;
348 if (down_read_killable(&dvnode->validate_lock) < 0)
349 goto error;
350
351 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
352 goto success;
353
354 up_read(&dvnode->validate_lock);
355 if (down_write_killable(&dvnode->validate_lock) < 0)
356 goto error;
357
358 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
359 trace_afs_reload_dir(dvnode);
360 ret = afs_fetch_data(dvnode, req);
361 if (ret < 0)
362 goto error_unlock;
363
364 task_io_account_read(PAGE_SIZE * req->nr_pages);
365
366 if (req->len < req->file_size) {
367 /* The content has grown, so we need to expand the
368 * buffer.
369 */
370 up_write(&dvnode->validate_lock);
371 remote_size = req->file_size;
372 goto expand;
373 }
374
375 /* Validate the data we just read. */
376 ret = afs_dir_check(dvnode, req);
377 if (ret < 0)
378 goto error_unlock;
379
380 // TODO: Trim excess pages
381
382 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
383 }
384
385 downgrade_write(&dvnode->validate_lock);
386success:
387 return req;
388
389error_unlock:
390 up_write(&dvnode->validate_lock);
391error:
392 afs_put_read(req);
393 _leave(" = %d", ret);
394 return ERR_PTR(ret);
395}
396
397/*
398 * deal with one block in an AFS directory
399 */
400static int afs_dir_iterate_block(struct afs_vnode *dvnode,
401 struct dir_context *ctx,
402 union afs_xdr_dir_block *block,
403 unsigned blkoff)
404{
405 union afs_xdr_dirent *dire;
406 unsigned offset, next, curr, nr_slots;
407 size_t nlen;
408 int tmp;
409
410 _enter("%llx,%x", ctx->pos, blkoff);
411
412 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
413
414 /* walk through the block, an entry at a time */
415 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
416 offset < AFS_DIR_SLOTS_PER_BLOCK;
417 offset = next
418 ) {
419 /* skip entries marked unused in the bitmap */
420 if (!(block->hdr.bitmap[offset / 8] &
421 (1 << (offset % 8)))) {
422 _debug("ENT[%zu.%u]: unused",
423 blkoff / sizeof(union afs_xdr_dir_block), offset);
424 next = offset + 1;
425 if (offset >= curr)
426 ctx->pos = blkoff +
427 next * sizeof(union afs_xdr_dirent);
428 continue;
429 }
430
431 /* got a valid entry */
432 dire = &block->dirents[offset];
433 nlen = strnlen(dire->u.name,
434 sizeof(*block) -
435 offset * sizeof(union afs_xdr_dirent));
436 if (nlen > AFSNAMEMAX - 1) {
437 _debug("ENT[%zu]: name too long (len %u/%zu)",
438 blkoff / sizeof(union afs_xdr_dir_block),
439 offset, nlen);
440 return afs_bad(dvnode, afs_file_error_dir_name_too_long);
441 }
442
443 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
444 blkoff / sizeof(union afs_xdr_dir_block), offset,
445 (offset < curr ? "skip" : "fill"),
446 nlen, dire->u.name);
447
448 nr_slots = afs_dir_calc_slots(nlen);
449 next = offset + nr_slots;
450 if (next > AFS_DIR_SLOTS_PER_BLOCK) {
451 _debug("ENT[%zu.%u]:"
452 " %u extends beyond end dir block"
453 " (len %zu)",
454 blkoff / sizeof(union afs_xdr_dir_block),
455 offset, next, nlen);
456 return afs_bad(dvnode, afs_file_error_dir_over_end);
457 }
458
459 /* Check that the name-extension dirents are all allocated */
460 for (tmp = 1; tmp < nr_slots; tmp++) {
461 unsigned int ix = offset + tmp;
462 if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) {
463 _debug("ENT[%zu.u]:"
464 " %u unmarked extension (%u/%u)",
465 blkoff / sizeof(union afs_xdr_dir_block),
466 offset, tmp, nr_slots);
467 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
468 }
469 }
470
471 /* skip if starts before the current position */
472 if (offset < curr) {
473 if (next > curr)
474 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
475 continue;
476 }
477
478 /* found the next entry */
479 if (!dir_emit(ctx, dire->u.name, nlen,
480 ntohl(dire->u.vnode),
481 (ctx->actor == afs_lookup_filldir ||
482 ctx->actor == afs_lookup_one_filldir)?
483 ntohl(dire->u.unique) : DT_UNKNOWN)) {
484 _leave(" = 0 [full]");
485 return 0;
486 }
487
488 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
489 }
490
491 _leave(" = 1 [more]");
492 return 1;
493}
494
495/*
496 * iterate through the data blob that lists the contents of an AFS directory
497 */
498static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
499 struct key *key, afs_dataversion_t *_dir_version)
500{
501 struct afs_vnode *dvnode = AFS_FS_I(dir);
502 union afs_xdr_dir_block *dblock;
503 struct afs_read *req;
504 struct folio *folio;
505 unsigned offset, size;
506 int ret;
507
508 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
509
510 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
511 _leave(" = -ESTALE");
512 return -ESTALE;
513 }
514
515 req = afs_read_dir(dvnode, key);
516 if (IS_ERR(req))
517 return PTR_ERR(req);
518 *_dir_version = req->data_version;
519
520 /* round the file position up to the next entry boundary */
521 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
522 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
523
524 /* walk through the blocks in sequence */
525 ret = 0;
526 while (ctx->pos < req->actual_len) {
527 /* Fetch the appropriate folio from the directory and re-add it
528 * to the LRU. We have all the pages pinned with an extra ref.
529 */
530 folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE,
531 FGP_ACCESSED, 0);
532 if (IS_ERR(folio)) {
533 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
534 break;
535 }
536
537 offset = round_down(ctx->pos, sizeof(*dblock)) - folio_pos(folio);
538 size = min_t(loff_t, folio_size(folio),
539 req->actual_len - folio_pos(folio));
540
541 do {
542 dblock = kmap_local_folio(folio, offset);
543 ret = afs_dir_iterate_block(dvnode, ctx, dblock,
544 folio_pos(folio) + offset);
545 kunmap_local(dblock);
546 if (ret != 1)
547 goto out;
548
549 } while (offset += sizeof(*dblock), offset < size);
550
551 ret = 0;
552 }
553
554out:
555 up_read(&dvnode->validate_lock);
556 afs_put_read(req);
557 _leave(" = %d", ret);
558 return ret;
559}
560
561/*
562 * read an AFS directory
563 */
564static int afs_readdir(struct file *file, struct dir_context *ctx)
565{
566 afs_dataversion_t dir_version;
567
568 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
569 &dir_version);
570}
571
572/*
573 * Search the directory for a single name
574 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
575 * uniquifier through dtype
576 */
577static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
578 int nlen, loff_t fpos, u64 ino, unsigned dtype)
579{
580 struct afs_lookup_one_cookie *cookie =
581 container_of(ctx, struct afs_lookup_one_cookie, ctx);
582
583 _enter("{%s,%u},%s,%u,,%llu,%u",
584 cookie->name.name, cookie->name.len, name, nlen,
585 (unsigned long long) ino, dtype);
586
587 /* insanity checks first */
588 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
589 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
590
591 if (cookie->name.len != nlen ||
592 memcmp(cookie->name.name, name, nlen) != 0) {
593 _leave(" = true [keep looking]");
594 return true;
595 }
596
597 cookie->fid.vnode = ino;
598 cookie->fid.unique = dtype;
599 cookie->found = 1;
600
601 _leave(" = false [found]");
602 return false;
603}
604
605/*
606 * Do a lookup of a single name in a directory
607 * - just returns the FID the dentry name maps to if found
608 */
609static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
610 struct afs_fid *fid, struct key *key,
611 afs_dataversion_t *_dir_version)
612{
613 struct afs_super_info *as = dir->i_sb->s_fs_info;
614 struct afs_lookup_one_cookie cookie = {
615 .ctx.actor = afs_lookup_one_filldir,
616 .name = dentry->d_name,
617 .fid.vid = as->volume->vid
618 };
619 int ret;
620
621 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
622
623 /* search the directory */
624 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
625 if (ret < 0) {
626 _leave(" = %d [iter]", ret);
627 return ret;
628 }
629
630 if (!cookie.found) {
631 _leave(" = -ENOENT [not found]");
632 return -ENOENT;
633 }
634
635 *fid = cookie.fid;
636 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
637 return 0;
638}
639
640/*
641 * search the directory for a name
642 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
643 * uniquifier through dtype
644 */
645static bool afs_lookup_filldir(struct dir_context *ctx, const char *name,
646 int nlen, loff_t fpos, u64 ino, unsigned dtype)
647{
648 struct afs_lookup_cookie *cookie =
649 container_of(ctx, struct afs_lookup_cookie, ctx);
650
651 _enter("{%s,%u},%s,%u,,%llu,%u",
652 cookie->name.name, cookie->name.len, name, nlen,
653 (unsigned long long) ino, dtype);
654
655 /* insanity checks first */
656 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
657 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
658
659 if (cookie->found) {
660 if (cookie->nr_fids < 50) {
661 cookie->fids[cookie->nr_fids].vnode = ino;
662 cookie->fids[cookie->nr_fids].unique = dtype;
663 cookie->nr_fids++;
664 }
665 } else if (cookie->name.len == nlen &&
666 memcmp(cookie->name.name, name, nlen) == 0) {
667 cookie->fids[1].vnode = ino;
668 cookie->fids[1].unique = dtype;
669 cookie->found = 1;
670 if (cookie->one_only)
671 return false;
672 }
673
674 return cookie->nr_fids < 50;
675}
676
677/*
678 * Deal with the result of a successful lookup operation. Turn all the files
679 * into inodes and save the first one - which is the one we actually want.
680 */
681static void afs_do_lookup_success(struct afs_operation *op)
682{
683 struct afs_vnode_param *vp;
684 struct afs_vnode *vnode;
685 struct inode *inode;
686 u32 abort_code;
687 int i;
688
689 _enter("");
690
691 for (i = 0; i < op->nr_files; i++) {
692 switch (i) {
693 case 0:
694 vp = &op->file[0];
695 abort_code = vp->scb.status.abort_code;
696 if (abort_code != 0) {
697 op->call_abort_code = abort_code;
698 afs_op_set_error(op, afs_abort_to_error(abort_code));
699 op->cumul_error.abort_code = abort_code;
700 }
701 break;
702
703 case 1:
704 vp = &op->file[1];
705 break;
706
707 default:
708 vp = &op->more_files[i - 2];
709 break;
710 }
711
712 if (vp->scb.status.abort_code)
713 trace_afs_bulkstat_error(op, &vp->fid, i, vp->scb.status.abort_code);
714 if (!vp->scb.have_status && !vp->scb.have_error)
715 continue;
716
717 _debug("do [%u]", i);
718 if (vp->vnode) {
719 if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
720 afs_vnode_commit_status(op, vp);
721 } else if (vp->scb.status.abort_code == 0) {
722 inode = afs_iget(op, vp);
723 if (!IS_ERR(inode)) {
724 vnode = AFS_FS_I(inode);
725 afs_cache_permit(vnode, op->key,
726 0 /* Assume vnode->cb_break is 0 */ +
727 op->cb_v_break,
728 &vp->scb);
729 vp->vnode = vnode;
730 vp->put_vnode = true;
731 }
732 } else {
733 _debug("- abort %d %llx:%llx.%x",
734 vp->scb.status.abort_code,
735 vp->fid.vid, vp->fid.vnode, vp->fid.unique);
736 }
737 }
738
739 _leave("");
740}
741
742static const struct afs_operation_ops afs_inline_bulk_status_operation = {
743 .issue_afs_rpc = afs_fs_inline_bulk_status,
744 .issue_yfs_rpc = yfs_fs_inline_bulk_status,
745 .success = afs_do_lookup_success,
746};
747
748static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
749 .issue_afs_rpc = afs_fs_fetch_status,
750 .issue_yfs_rpc = yfs_fs_fetch_status,
751 .success = afs_do_lookup_success,
752 .aborted = afs_check_for_remote_deletion,
753};
754
755/*
756 * See if we know that the server we expect to use doesn't support
757 * FS.InlineBulkStatus.
758 */
759static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
760{
761 struct afs_server_list *slist;
762 struct afs_volume *volume = dvnode->volume;
763 struct afs_server *server;
764 bool ret = true;
765 int i;
766
767 if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
768 return true;
769
770 rcu_read_lock();
771 slist = rcu_dereference(volume->servers);
772
773 for (i = 0; i < slist->nr_servers; i++) {
774 server = slist->servers[i].server;
775 if (server == dvnode->cb_server) {
776 if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
777 ret = false;
778 break;
779 }
780 }
781
782 rcu_read_unlock();
783 return ret;
784}
785
786/*
787 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
788 * files in one go and create inodes for them. The inode of the file we were
789 * asked for is returned.
790 */
791static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
792 struct key *key)
793{
794 struct afs_lookup_cookie *cookie;
795 struct afs_vnode_param *vp;
796 struct afs_operation *op;
797 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
798 struct inode *inode = NULL, *ti;
799 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
800 long ret;
801 int i;
802
803 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
804
805 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
806 if (!cookie)
807 return ERR_PTR(-ENOMEM);
808
809 for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
810 cookie->fids[i].vid = dvnode->fid.vid;
811 cookie->ctx.actor = afs_lookup_filldir;
812 cookie->name = dentry->d_name;
813 cookie->nr_fids = 2; /* slot 1 is saved for the fid we actually want
814 * and slot 0 for the directory */
815
816 if (!afs_server_supports_ibulk(dvnode))
817 cookie->one_only = true;
818
819 /* search the directory */
820 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
821 if (ret < 0)
822 goto out;
823
824 dentry->d_fsdata = (void *)(unsigned long)data_version;
825
826 ret = -ENOENT;
827 if (!cookie->found)
828 goto out;
829
830 /* Check to see if we already have an inode for the primary fid. */
831 inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
832 afs_ilookup5_test_by_fid, &cookie->fids[1]);
833 if (inode)
834 goto out; /* We do */
835
836 /* Okay, we didn't find it. We need to query the server - and whilst
837 * we're doing that, we're going to attempt to look up a bunch of other
838 * vnodes also.
839 */
840 op = afs_alloc_operation(NULL, dvnode->volume);
841 if (IS_ERR(op)) {
842 ret = PTR_ERR(op);
843 goto out;
844 }
845
846 afs_op_set_vnode(op, 0, dvnode);
847 afs_op_set_fid(op, 1, &cookie->fids[1]);
848
849 op->nr_files = cookie->nr_fids;
850 _debug("nr_files %u", op->nr_files);
851
852 /* Need space for examining all the selected files */
853 if (op->nr_files > 2) {
854 op->more_files = kvcalloc(op->nr_files - 2,
855 sizeof(struct afs_vnode_param),
856 GFP_KERNEL);
857 if (!op->more_files) {
858 afs_op_nomem(op);
859 goto out_op;
860 }
861
862 for (i = 2; i < op->nr_files; i++) {
863 vp = &op->more_files[i - 2];
864 vp->fid = cookie->fids[i];
865
866 /* Find any inodes that already exist and get their
867 * callback counters.
868 */
869 ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
870 afs_ilookup5_test_by_fid, &vp->fid);
871 if (!IS_ERR_OR_NULL(ti)) {
872 vnode = AFS_FS_I(ti);
873 vp->dv_before = vnode->status.data_version;
874 vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
875 vp->vnode = vnode;
876 vp->put_vnode = true;
877 vp->speculative = true; /* vnode not locked */
878 }
879 }
880 }
881
882 /* Try FS.InlineBulkStatus first. Abort codes for the individual
883 * lookups contained therein are stored in the reply without aborting
884 * the whole operation.
885 */
886 afs_op_set_error(op, -ENOTSUPP);
887 if (!cookie->one_only) {
888 op->ops = &afs_inline_bulk_status_operation;
889 afs_begin_vnode_operation(op);
890 afs_wait_for_operation(op);
891 }
892
893 if (afs_op_error(op) == -ENOTSUPP) {
894 /* We could try FS.BulkStatus next, but this aborts the entire
895 * op if any of the lookups fails - so, for the moment, revert
896 * to FS.FetchStatus for op->file[1].
897 */
898 op->fetch_status.which = 1;
899 op->ops = &afs_lookup_fetch_status_operation;
900 afs_begin_vnode_operation(op);
901 afs_wait_for_operation(op);
902 }
903
904out_op:
905 if (!afs_op_error(op)) {
906 if (op->file[1].scb.status.abort_code) {
907 afs_op_accumulate_error(op, -ECONNABORTED,
908 op->file[1].scb.status.abort_code);
909 } else {
910 inode = &op->file[1].vnode->netfs.inode;
911 op->file[1].vnode = NULL;
912 }
913 }
914
915 if (op->file[0].scb.have_status)
916 dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
917 else
918 dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
919 ret = afs_put_operation(op);
920out:
921 kfree(cookie);
922 _leave("");
923 return inode ?: ERR_PTR(ret);
924}
925
926/*
927 * Look up an entry in a directory with @sys substitution.
928 */
929static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
930 struct key *key)
931{
932 struct afs_sysnames *subs;
933 struct afs_net *net = afs_i2net(dir);
934 struct dentry *ret;
935 char *buf, *p, *name;
936 int len, i;
937
938 _enter("");
939
940 ret = ERR_PTR(-ENOMEM);
941 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
942 if (!buf)
943 goto out_p;
944 if (dentry->d_name.len > 4) {
945 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
946 p += dentry->d_name.len - 4;
947 }
948
949 /* There is an ordered list of substitutes that we have to try. */
950 read_lock(&net->sysnames_lock);
951 subs = net->sysnames;
952 refcount_inc(&subs->usage);
953 read_unlock(&net->sysnames_lock);
954
955 for (i = 0; i < subs->nr; i++) {
956 name = subs->subs[i];
957 len = dentry->d_name.len - 4 + strlen(name);
958 if (len >= AFSNAMEMAX) {
959 ret = ERR_PTR(-ENAMETOOLONG);
960 goto out_s;
961 }
962
963 strcpy(p, name);
964 ret = lookup_one_len(buf, dentry->d_parent, len);
965 if (IS_ERR(ret) || d_is_positive(ret))
966 goto out_s;
967 dput(ret);
968 }
969
970 /* We don't want to d_add() the @sys dentry here as we don't want to
971 * the cached dentry to hide changes to the sysnames list.
972 */
973 ret = NULL;
974out_s:
975 afs_put_sysnames(subs);
976 kfree(buf);
977out_p:
978 key_put(key);
979 return ret;
980}
981
982/*
983 * look up an entry in a directory
984 */
985static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
986 unsigned int flags)
987{
988 struct afs_vnode *dvnode = AFS_FS_I(dir);
989 struct afs_fid fid = {};
990 struct inode *inode;
991 struct dentry *d;
992 struct key *key;
993 int ret;
994
995 _enter("{%llx:%llu},%p{%pd},",
996 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
997
998 ASSERTCMP(d_inode(dentry), ==, NULL);
999
1000 if (dentry->d_name.len >= AFSNAMEMAX) {
1001 _leave(" = -ENAMETOOLONG");
1002 return ERR_PTR(-ENAMETOOLONG);
1003 }
1004
1005 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
1006 _leave(" = -ESTALE");
1007 return ERR_PTR(-ESTALE);
1008 }
1009
1010 key = afs_request_key(dvnode->volume->cell);
1011 if (IS_ERR(key)) {
1012 _leave(" = %ld [key]", PTR_ERR(key));
1013 return ERR_CAST(key);
1014 }
1015
1016 ret = afs_validate(dvnode, key);
1017 if (ret < 0) {
1018 key_put(key);
1019 _leave(" = %d [val]", ret);
1020 return ERR_PTR(ret);
1021 }
1022
1023 if (dentry->d_name.len >= 4 &&
1024 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
1025 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
1026 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
1027 dentry->d_name.name[dentry->d_name.len - 1] == 's')
1028 return afs_lookup_atsys(dir, dentry, key);
1029
1030 afs_stat_v(dvnode, n_lookup);
1031 inode = afs_do_lookup(dir, dentry, key);
1032 key_put(key);
1033 if (inode == ERR_PTR(-ENOENT))
1034 inode = afs_try_auto_mntpt(dentry, dir);
1035
1036 if (!IS_ERR_OR_NULL(inode))
1037 fid = AFS_FS_I(inode)->fid;
1038
1039 _debug("splice %p", dentry->d_inode);
1040 d = d_splice_alias(inode, dentry);
1041 if (!IS_ERR_OR_NULL(d)) {
1042 d->d_fsdata = dentry->d_fsdata;
1043 trace_afs_lookup(dvnode, &d->d_name, &fid);
1044 } else {
1045 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
1046 }
1047 _leave("");
1048 return d;
1049}
1050
1051/*
1052 * Check the validity of a dentry under RCU conditions.
1053 */
1054static int afs_d_revalidate_rcu(struct dentry *dentry)
1055{
1056 struct afs_vnode *dvnode;
1057 struct dentry *parent;
1058 struct inode *dir;
1059 long dir_version, de_version;
1060
1061 _enter("%p", dentry);
1062
1063 /* Check the parent directory is still valid first. */
1064 parent = READ_ONCE(dentry->d_parent);
1065 dir = d_inode_rcu(parent);
1066 if (!dir)
1067 return -ECHILD;
1068 dvnode = AFS_FS_I(dir);
1069 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
1070 return -ECHILD;
1071
1072 if (!afs_check_validity(dvnode))
1073 return -ECHILD;
1074
1075 /* We only need to invalidate a dentry if the server's copy changed
1076 * behind our back. If we made the change, it's no problem. Note that
1077 * on a 32-bit system, we only have 32 bits in the dentry to store the
1078 * version.
1079 */
1080 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1081 de_version = (long)READ_ONCE(dentry->d_fsdata);
1082 if (de_version != dir_version) {
1083 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1084 if (de_version - dir_version < 0)
1085 return -ECHILD;
1086 }
1087
1088 return 1; /* Still valid */
1089}
1090
1091/*
1092 * check that a dentry lookup hit has found a valid entry
1093 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1094 * inode
1095 */
1096static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
1097{
1098 struct afs_vnode *vnode, *dir;
1099 struct afs_fid fid;
1100 struct dentry *parent;
1101 struct inode *inode;
1102 struct key *key;
1103 afs_dataversion_t dir_version, invalid_before;
1104 long de_version;
1105 int ret;
1106
1107 if (flags & LOOKUP_RCU)
1108 return afs_d_revalidate_rcu(dentry);
1109
1110 if (d_really_is_positive(dentry)) {
1111 vnode = AFS_FS_I(d_inode(dentry));
1112 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1113 vnode->fid.vid, vnode->fid.vnode, dentry,
1114 vnode->flags);
1115 } else {
1116 _enter("{neg n=%pd}", dentry);
1117 }
1118
1119 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1120 if (IS_ERR(key))
1121 key = NULL;
1122
1123 /* Hold the parent dentry so we can peer at it */
1124 parent = dget_parent(dentry);
1125 dir = AFS_FS_I(d_inode(parent));
1126
1127 /* validate the parent directory */
1128 ret = afs_validate(dir, key);
1129 if (ret == -ERESTARTSYS) {
1130 dput(parent);
1131 key_put(key);
1132 return ret;
1133 }
1134
1135 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1136 _debug("%pd: parent dir deleted", dentry);
1137 goto not_found;
1138 }
1139
1140 /* We only need to invalidate a dentry if the server's copy changed
1141 * behind our back. If we made the change, it's no problem. Note that
1142 * on a 32-bit system, we only have 32 bits in the dentry to store the
1143 * version.
1144 */
1145 dir_version = dir->status.data_version;
1146 de_version = (long)dentry->d_fsdata;
1147 if (de_version == (long)dir_version)
1148 goto out_valid_noupdate;
1149
1150 invalid_before = dir->invalid_before;
1151 if (de_version - (long)invalid_before >= 0)
1152 goto out_valid;
1153
1154 _debug("dir modified");
1155 afs_stat_v(dir, n_reval);
1156
1157 /* search the directory for this vnode */
1158 ret = afs_do_lookup_one(&dir->netfs.inode, dentry, &fid, key, &dir_version);
1159 switch (ret) {
1160 case 0:
1161 /* the filename maps to something */
1162 if (d_really_is_negative(dentry))
1163 goto not_found;
1164 inode = d_inode(dentry);
1165 if (is_bad_inode(inode)) {
1166 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1167 dentry);
1168 goto not_found;
1169 }
1170
1171 vnode = AFS_FS_I(inode);
1172
1173 /* if the vnode ID has changed, then the dirent points to a
1174 * different file */
1175 if (fid.vnode != vnode->fid.vnode) {
1176 _debug("%pd: dirent changed [%llu != %llu]",
1177 dentry, fid.vnode,
1178 vnode->fid.vnode);
1179 goto not_found;
1180 }
1181
1182 /* if the vnode ID uniqifier has changed, then the file has
1183 * been deleted and replaced, and the original vnode ID has
1184 * been reused */
1185 if (fid.unique != vnode->fid.unique) {
1186 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1187 dentry, fid.unique,
1188 vnode->fid.unique,
1189 vnode->netfs.inode.i_generation);
1190 goto not_found;
1191 }
1192 goto out_valid;
1193
1194 case -ENOENT:
1195 /* the filename is unknown */
1196 _debug("%pd: dirent not found", dentry);
1197 if (d_really_is_positive(dentry))
1198 goto not_found;
1199 goto out_valid;
1200
1201 default:
1202 _debug("failed to iterate dir %pd: %d",
1203 parent, ret);
1204 goto not_found;
1205 }
1206
1207out_valid:
1208 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1209out_valid_noupdate:
1210 dput(parent);
1211 key_put(key);
1212 _leave(" = 1 [valid]");
1213 return 1;
1214
1215not_found:
1216 _debug("dropping dentry %pd2", dentry);
1217 dput(parent);
1218 key_put(key);
1219
1220 _leave(" = 0 [bad]");
1221 return 0;
1222}
1223
1224/*
1225 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1226 * sleep)
1227 * - called from dput() when d_count is going to 0.
1228 * - return 1 to request dentry be unhashed, 0 otherwise
1229 */
1230static int afs_d_delete(const struct dentry *dentry)
1231{
1232 _enter("%pd", dentry);
1233
1234 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1235 goto zap;
1236
1237 if (d_really_is_positive(dentry) &&
1238 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1239 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1240 goto zap;
1241
1242 _leave(" = 0 [keep]");
1243 return 0;
1244
1245zap:
1246 _leave(" = 1 [zap]");
1247 return 1;
1248}
1249
1250/*
1251 * Clean up sillyrename files on dentry removal.
1252 */
1253static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1254{
1255 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1256 afs_silly_iput(dentry, inode);
1257 iput(inode);
1258}
1259
1260/*
1261 * handle dentry release
1262 */
1263void afs_d_release(struct dentry *dentry)
1264{
1265 _enter("%pd", dentry);
1266}
1267
1268void afs_check_for_remote_deletion(struct afs_operation *op)
1269{
1270 struct afs_vnode *vnode = op->file[0].vnode;
1271
1272 switch (afs_op_abort_code(op)) {
1273 case VNOVNODE:
1274 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1275 clear_nlink(&vnode->netfs.inode);
1276 afs_break_callback(vnode, afs_cb_break_for_deleted);
1277 }
1278}
1279
1280/*
1281 * Create a new inode for create/mkdir/symlink
1282 */
1283static void afs_vnode_new_inode(struct afs_operation *op)
1284{
1285 struct afs_vnode_param *vp = &op->file[1];
1286 struct afs_vnode *vnode;
1287 struct inode *inode;
1288
1289 _enter("");
1290
1291 ASSERTCMP(afs_op_error(op), ==, 0);
1292
1293 inode = afs_iget(op, vp);
1294 if (IS_ERR(inode)) {
1295 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1296 * the new directory on the server.
1297 */
1298 afs_op_accumulate_error(op, PTR_ERR(inode), 0);
1299 return;
1300 }
1301
1302 vnode = AFS_FS_I(inode);
1303 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1304 if (!afs_op_error(op))
1305 afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
1306 d_instantiate(op->dentry, inode);
1307}
1308
1309static void afs_create_success(struct afs_operation *op)
1310{
1311 _enter("op=%08x", op->debug_id);
1312 op->ctime = op->file[0].scb.status.mtime_client;
1313 afs_vnode_commit_status(op, &op->file[0]);
1314 afs_update_dentry_version(op, &op->file[0], op->dentry);
1315 afs_vnode_new_inode(op);
1316}
1317
1318static void afs_create_edit_dir(struct afs_operation *op)
1319{
1320 struct afs_vnode_param *dvp = &op->file[0];
1321 struct afs_vnode_param *vp = &op->file[1];
1322 struct afs_vnode *dvnode = dvp->vnode;
1323
1324 _enter("op=%08x", op->debug_id);
1325
1326 down_write(&dvnode->validate_lock);
1327 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1328 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1329 afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
1330 op->create.reason);
1331 up_write(&dvnode->validate_lock);
1332}
1333
1334static void afs_create_put(struct afs_operation *op)
1335{
1336 _enter("op=%08x", op->debug_id);
1337
1338 if (afs_op_error(op))
1339 d_drop(op->dentry);
1340}
1341
1342static const struct afs_operation_ops afs_mkdir_operation = {
1343 .issue_afs_rpc = afs_fs_make_dir,
1344 .issue_yfs_rpc = yfs_fs_make_dir,
1345 .success = afs_create_success,
1346 .aborted = afs_check_for_remote_deletion,
1347 .edit_dir = afs_create_edit_dir,
1348 .put = afs_create_put,
1349};
1350
1351/*
1352 * create a directory on an AFS filesystem
1353 */
1354static int afs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
1355 struct dentry *dentry, umode_t mode)
1356{
1357 struct afs_operation *op;
1358 struct afs_vnode *dvnode = AFS_FS_I(dir);
1359
1360 _enter("{%llx:%llu},{%pd},%ho",
1361 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1362
1363 op = afs_alloc_operation(NULL, dvnode->volume);
1364 if (IS_ERR(op)) {
1365 d_drop(dentry);
1366 return PTR_ERR(op);
1367 }
1368
1369 afs_op_set_vnode(op, 0, dvnode);
1370 op->file[0].dv_delta = 1;
1371 op->file[0].modification = true;
1372 op->file[0].update_ctime = true;
1373 op->dentry = dentry;
1374 op->create.mode = S_IFDIR | mode;
1375 op->create.reason = afs_edit_dir_for_mkdir;
1376 op->mtime = current_time(dir);
1377 op->ops = &afs_mkdir_operation;
1378 return afs_do_sync_operation(op);
1379}
1380
1381/*
1382 * Remove a subdir from a directory.
1383 */
1384static void afs_dir_remove_subdir(struct dentry *dentry)
1385{
1386 if (d_really_is_positive(dentry)) {
1387 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1388
1389 clear_nlink(&vnode->netfs.inode);
1390 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1391 atomic64_set(&vnode->cb_expires_at, AFS_NO_CB_PROMISE);
1392 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1393 }
1394}
1395
1396static void afs_rmdir_success(struct afs_operation *op)
1397{
1398 _enter("op=%08x", op->debug_id);
1399 op->ctime = op->file[0].scb.status.mtime_client;
1400 afs_vnode_commit_status(op, &op->file[0]);
1401 afs_update_dentry_version(op, &op->file[0], op->dentry);
1402}
1403
1404static void afs_rmdir_edit_dir(struct afs_operation *op)
1405{
1406 struct afs_vnode_param *dvp = &op->file[0];
1407 struct afs_vnode *dvnode = dvp->vnode;
1408
1409 _enter("op=%08x", op->debug_id);
1410 afs_dir_remove_subdir(op->dentry);
1411
1412 down_write(&dvnode->validate_lock);
1413 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1414 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1415 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1416 afs_edit_dir_for_rmdir);
1417 up_write(&dvnode->validate_lock);
1418}
1419
1420static void afs_rmdir_put(struct afs_operation *op)
1421{
1422 _enter("op=%08x", op->debug_id);
1423 if (op->file[1].vnode)
1424 up_write(&op->file[1].vnode->rmdir_lock);
1425}
1426
1427static const struct afs_operation_ops afs_rmdir_operation = {
1428 .issue_afs_rpc = afs_fs_remove_dir,
1429 .issue_yfs_rpc = yfs_fs_remove_dir,
1430 .success = afs_rmdir_success,
1431 .aborted = afs_check_for_remote_deletion,
1432 .edit_dir = afs_rmdir_edit_dir,
1433 .put = afs_rmdir_put,
1434};
1435
1436/*
1437 * remove a directory from an AFS filesystem
1438 */
1439static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1440{
1441 struct afs_operation *op;
1442 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1443 int ret;
1444
1445 _enter("{%llx:%llu},{%pd}",
1446 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1447
1448 op = afs_alloc_operation(NULL, dvnode->volume);
1449 if (IS_ERR(op))
1450 return PTR_ERR(op);
1451
1452 afs_op_set_vnode(op, 0, dvnode);
1453 op->file[0].dv_delta = 1;
1454 op->file[0].modification = true;
1455 op->file[0].update_ctime = true;
1456
1457 op->dentry = dentry;
1458 op->ops = &afs_rmdir_operation;
1459
1460 /* Try to make sure we have a callback promise on the victim. */
1461 if (d_really_is_positive(dentry)) {
1462 vnode = AFS_FS_I(d_inode(dentry));
1463 ret = afs_validate(vnode, op->key);
1464 if (ret < 0)
1465 goto error;
1466 }
1467
1468 if (vnode) {
1469 ret = down_write_killable(&vnode->rmdir_lock);
1470 if (ret < 0)
1471 goto error;
1472 op->file[1].vnode = vnode;
1473 }
1474
1475 ret = afs_do_sync_operation(op);
1476
1477 /* Not all systems that can host afs servers have ENOTEMPTY. */
1478 if (ret == -EEXIST)
1479 ret = -ENOTEMPTY;
1480 return ret;
1481
1482error:
1483 return afs_put_operation(op);
1484}
1485
1486/*
1487 * Remove a link to a file or symlink from a directory.
1488 *
1489 * If the file was not deleted due to excess hard links, the fileserver will
1490 * break the callback promise on the file - if it had one - before it returns
1491 * to us, and if it was deleted, it won't
1492 *
1493 * However, if we didn't have a callback promise outstanding, or it was
1494 * outstanding on a different server, then it won't break it either...
1495 */
1496static void afs_dir_remove_link(struct afs_operation *op)
1497{
1498 struct afs_vnode *dvnode = op->file[0].vnode;
1499 struct afs_vnode *vnode = op->file[1].vnode;
1500 struct dentry *dentry = op->dentry;
1501 int ret;
1502
1503 if (afs_op_error(op) ||
1504 (op->file[1].scb.have_status && op->file[1].scb.have_error))
1505 return;
1506 if (d_really_is_positive(dentry))
1507 return;
1508
1509 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1510 /* Already done */
1511 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1512 write_seqlock(&vnode->cb_lock);
1513 drop_nlink(&vnode->netfs.inode);
1514 if (vnode->netfs.inode.i_nlink == 0) {
1515 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1516 __afs_break_callback(vnode, afs_cb_break_for_unlink);
1517 }
1518 write_sequnlock(&vnode->cb_lock);
1519 } else {
1520 afs_break_callback(vnode, afs_cb_break_for_unlink);
1521
1522 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1523 _debug("AFS_VNODE_DELETED");
1524
1525 ret = afs_validate(vnode, op->key);
1526 if (ret != -ESTALE)
1527 afs_op_set_error(op, ret);
1528 }
1529
1530 _debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, afs_op_error(op));
1531}
1532
1533static void afs_unlink_success(struct afs_operation *op)
1534{
1535 _enter("op=%08x", op->debug_id);
1536 op->ctime = op->file[0].scb.status.mtime_client;
1537 afs_check_dir_conflict(op, &op->file[0]);
1538 afs_vnode_commit_status(op, &op->file[0]);
1539 afs_vnode_commit_status(op, &op->file[1]);
1540 afs_update_dentry_version(op, &op->file[0], op->dentry);
1541 afs_dir_remove_link(op);
1542}
1543
1544static void afs_unlink_edit_dir(struct afs_operation *op)
1545{
1546 struct afs_vnode_param *dvp = &op->file[0];
1547 struct afs_vnode *dvnode = dvp->vnode;
1548
1549 _enter("op=%08x", op->debug_id);
1550 down_write(&dvnode->validate_lock);
1551 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1552 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
1553 afs_edit_dir_remove(dvnode, &op->dentry->d_name,
1554 afs_edit_dir_for_unlink);
1555 up_write(&dvnode->validate_lock);
1556}
1557
1558static void afs_unlink_put(struct afs_operation *op)
1559{
1560 _enter("op=%08x", op->debug_id);
1561 if (op->unlink.need_rehash && afs_op_error(op) < 0 && afs_op_error(op) != -ENOENT)
1562 d_rehash(op->dentry);
1563}
1564
1565static const struct afs_operation_ops afs_unlink_operation = {
1566 .issue_afs_rpc = afs_fs_remove_file,
1567 .issue_yfs_rpc = yfs_fs_remove_file,
1568 .success = afs_unlink_success,
1569 .aborted = afs_check_for_remote_deletion,
1570 .edit_dir = afs_unlink_edit_dir,
1571 .put = afs_unlink_put,
1572};
1573
1574/*
1575 * Remove a file or symlink from an AFS filesystem.
1576 */
1577static int afs_unlink(struct inode *dir, struct dentry *dentry)
1578{
1579 struct afs_operation *op;
1580 struct afs_vnode *dvnode = AFS_FS_I(dir);
1581 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1582 int ret;
1583
1584 _enter("{%llx:%llu},{%pd}",
1585 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1586
1587 if (dentry->d_name.len >= AFSNAMEMAX)
1588 return -ENAMETOOLONG;
1589
1590 op = afs_alloc_operation(NULL, dvnode->volume);
1591 if (IS_ERR(op))
1592 return PTR_ERR(op);
1593
1594 afs_op_set_vnode(op, 0, dvnode);
1595 op->file[0].dv_delta = 1;
1596 op->file[0].modification = true;
1597 op->file[0].update_ctime = true;
1598
1599 /* Try to make sure we have a callback promise on the victim. */
1600 ret = afs_validate(vnode, op->key);
1601 if (ret < 0) {
1602 afs_op_set_error(op, ret);
1603 goto error;
1604 }
1605
1606 spin_lock(&dentry->d_lock);
1607 if (d_count(dentry) > 1) {
1608 spin_unlock(&dentry->d_lock);
1609 /* Start asynchronous writeout of the inode */
1610 write_inode_now(d_inode(dentry), 0);
1611 afs_op_set_error(op, afs_sillyrename(dvnode, vnode, dentry, op->key));
1612 goto error;
1613 }
1614 if (!d_unhashed(dentry)) {
1615 /* Prevent a race with RCU lookup. */
1616 __d_drop(dentry);
1617 op->unlink.need_rehash = true;
1618 }
1619 spin_unlock(&dentry->d_lock);
1620
1621 op->file[1].vnode = vnode;
1622 op->file[1].update_ctime = true;
1623 op->file[1].op_unlinked = true;
1624 op->dentry = dentry;
1625 op->ops = &afs_unlink_operation;
1626 afs_begin_vnode_operation(op);
1627 afs_wait_for_operation(op);
1628
1629 /* If there was a conflict with a third party, check the status of the
1630 * unlinked vnode.
1631 */
1632 if (afs_op_error(op) == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
1633 op->file[1].update_ctime = false;
1634 op->fetch_status.which = 1;
1635 op->ops = &afs_fetch_status_operation;
1636 afs_begin_vnode_operation(op);
1637 afs_wait_for_operation(op);
1638 }
1639
1640 return afs_put_operation(op);
1641
1642error:
1643 return afs_put_operation(op);
1644}
1645
1646static const struct afs_operation_ops afs_create_operation = {
1647 .issue_afs_rpc = afs_fs_create_file,
1648 .issue_yfs_rpc = yfs_fs_create_file,
1649 .success = afs_create_success,
1650 .aborted = afs_check_for_remote_deletion,
1651 .edit_dir = afs_create_edit_dir,
1652 .put = afs_create_put,
1653};
1654
1655/*
1656 * create a regular file on an AFS filesystem
1657 */
1658static int afs_create(struct mnt_idmap *idmap, struct inode *dir,
1659 struct dentry *dentry, umode_t mode, bool excl)
1660{
1661 struct afs_operation *op;
1662 struct afs_vnode *dvnode = AFS_FS_I(dir);
1663 int ret = -ENAMETOOLONG;
1664
1665 _enter("{%llx:%llu},{%pd},%ho",
1666 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1667
1668 if (dentry->d_name.len >= AFSNAMEMAX)
1669 goto error;
1670
1671 op = afs_alloc_operation(NULL, dvnode->volume);
1672 if (IS_ERR(op)) {
1673 ret = PTR_ERR(op);
1674 goto error;
1675 }
1676
1677 afs_op_set_vnode(op, 0, dvnode);
1678 op->file[0].dv_delta = 1;
1679 op->file[0].modification = true;
1680 op->file[0].update_ctime = true;
1681
1682 op->dentry = dentry;
1683 op->create.mode = S_IFREG | mode;
1684 op->create.reason = afs_edit_dir_for_create;
1685 op->mtime = current_time(dir);
1686 op->ops = &afs_create_operation;
1687 return afs_do_sync_operation(op);
1688
1689error:
1690 d_drop(dentry);
1691 _leave(" = %d", ret);
1692 return ret;
1693}
1694
1695static void afs_link_success(struct afs_operation *op)
1696{
1697 struct afs_vnode_param *dvp = &op->file[0];
1698 struct afs_vnode_param *vp = &op->file[1];
1699
1700 _enter("op=%08x", op->debug_id);
1701 op->ctime = dvp->scb.status.mtime_client;
1702 afs_vnode_commit_status(op, dvp);
1703 afs_vnode_commit_status(op, vp);
1704 afs_update_dentry_version(op, dvp, op->dentry);
1705 if (op->dentry_2->d_parent == op->dentry->d_parent)
1706 afs_update_dentry_version(op, dvp, op->dentry_2);
1707 ihold(&vp->vnode->netfs.inode);
1708 d_instantiate(op->dentry, &vp->vnode->netfs.inode);
1709}
1710
1711static void afs_link_put(struct afs_operation *op)
1712{
1713 _enter("op=%08x", op->debug_id);
1714 if (afs_op_error(op))
1715 d_drop(op->dentry);
1716}
1717
1718static const struct afs_operation_ops afs_link_operation = {
1719 .issue_afs_rpc = afs_fs_link,
1720 .issue_yfs_rpc = yfs_fs_link,
1721 .success = afs_link_success,
1722 .aborted = afs_check_for_remote_deletion,
1723 .edit_dir = afs_create_edit_dir,
1724 .put = afs_link_put,
1725};
1726
1727/*
1728 * create a hard link between files in an AFS filesystem
1729 */
1730static int afs_link(struct dentry *from, struct inode *dir,
1731 struct dentry *dentry)
1732{
1733 struct afs_operation *op;
1734 struct afs_vnode *dvnode = AFS_FS_I(dir);
1735 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1736 int ret = -ENAMETOOLONG;
1737
1738 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1739 vnode->fid.vid, vnode->fid.vnode,
1740 dvnode->fid.vid, dvnode->fid.vnode,
1741 dentry);
1742
1743 if (dentry->d_name.len >= AFSNAMEMAX)
1744 goto error;
1745
1746 op = afs_alloc_operation(NULL, dvnode->volume);
1747 if (IS_ERR(op)) {
1748 ret = PTR_ERR(op);
1749 goto error;
1750 }
1751
1752 ret = afs_validate(vnode, op->key);
1753 if (ret < 0)
1754 goto error_op;
1755
1756 afs_op_set_vnode(op, 0, dvnode);
1757 afs_op_set_vnode(op, 1, vnode);
1758 op->file[0].dv_delta = 1;
1759 op->file[0].modification = true;
1760 op->file[0].update_ctime = true;
1761 op->file[1].update_ctime = true;
1762
1763 op->dentry = dentry;
1764 op->dentry_2 = from;
1765 op->ops = &afs_link_operation;
1766 op->create.reason = afs_edit_dir_for_link;
1767 return afs_do_sync_operation(op);
1768
1769error_op:
1770 afs_put_operation(op);
1771error:
1772 d_drop(dentry);
1773 _leave(" = %d", ret);
1774 return ret;
1775}
1776
1777static const struct afs_operation_ops afs_symlink_operation = {
1778 .issue_afs_rpc = afs_fs_symlink,
1779 .issue_yfs_rpc = yfs_fs_symlink,
1780 .success = afs_create_success,
1781 .aborted = afs_check_for_remote_deletion,
1782 .edit_dir = afs_create_edit_dir,
1783 .put = afs_create_put,
1784};
1785
1786/*
1787 * create a symlink in an AFS filesystem
1788 */
1789static int afs_symlink(struct mnt_idmap *idmap, struct inode *dir,
1790 struct dentry *dentry, const char *content)
1791{
1792 struct afs_operation *op;
1793 struct afs_vnode *dvnode = AFS_FS_I(dir);
1794 int ret;
1795
1796 _enter("{%llx:%llu},{%pd},%s",
1797 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1798 content);
1799
1800 ret = -ENAMETOOLONG;
1801 if (dentry->d_name.len >= AFSNAMEMAX)
1802 goto error;
1803
1804 ret = -EINVAL;
1805 if (strlen(content) >= AFSPATHMAX)
1806 goto error;
1807
1808 op = afs_alloc_operation(NULL, dvnode->volume);
1809 if (IS_ERR(op)) {
1810 ret = PTR_ERR(op);
1811 goto error;
1812 }
1813
1814 afs_op_set_vnode(op, 0, dvnode);
1815 op->file[0].dv_delta = 1;
1816
1817 op->dentry = dentry;
1818 op->ops = &afs_symlink_operation;
1819 op->create.reason = afs_edit_dir_for_symlink;
1820 op->create.symlink = content;
1821 op->mtime = current_time(dir);
1822 return afs_do_sync_operation(op);
1823
1824error:
1825 d_drop(dentry);
1826 _leave(" = %d", ret);
1827 return ret;
1828}
1829
1830static void afs_rename_success(struct afs_operation *op)
1831{
1832 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
1833
1834 _enter("op=%08x", op->debug_id);
1835
1836 op->ctime = op->file[0].scb.status.mtime_client;
1837 afs_check_dir_conflict(op, &op->file[1]);
1838 afs_vnode_commit_status(op, &op->file[0]);
1839 if (op->file[1].vnode != op->file[0].vnode) {
1840 op->ctime = op->file[1].scb.status.mtime_client;
1841 afs_vnode_commit_status(op, &op->file[1]);
1842 }
1843
1844 /* If we're moving a subdir between dirs, we need to update
1845 * its DV counter too as the ".." will be altered.
1846 */
1847 if (S_ISDIR(vnode->netfs.inode.i_mode) &&
1848 op->file[0].vnode != op->file[1].vnode) {
1849 u64 new_dv;
1850
1851 write_seqlock(&vnode->cb_lock);
1852
1853 new_dv = vnode->status.data_version + 1;
1854 vnode->status.data_version = new_dv;
1855 inode_set_iversion_raw(&vnode->netfs.inode, new_dv);
1856
1857 write_sequnlock(&vnode->cb_lock);
1858 }
1859}
1860
1861static void afs_rename_edit_dir(struct afs_operation *op)
1862{
1863 struct afs_vnode_param *orig_dvp = &op->file[0];
1864 struct afs_vnode_param *new_dvp = &op->file[1];
1865 struct afs_vnode *orig_dvnode = orig_dvp->vnode;
1866 struct afs_vnode *new_dvnode = new_dvp->vnode;
1867 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
1868 struct dentry *old_dentry = op->dentry;
1869 struct dentry *new_dentry = op->dentry_2;
1870 struct inode *new_inode;
1871
1872 _enter("op=%08x", op->debug_id);
1873
1874 if (op->rename.rehash) {
1875 d_rehash(op->rename.rehash);
1876 op->rename.rehash = NULL;
1877 }
1878
1879 down_write(&orig_dvnode->validate_lock);
1880 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1881 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
1882 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1883 afs_edit_dir_for_rename_0);
1884
1885 if (new_dvnode != orig_dvnode) {
1886 up_write(&orig_dvnode->validate_lock);
1887 down_write(&new_dvnode->validate_lock);
1888 }
1889
1890 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
1891 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
1892 if (!op->rename.new_negative)
1893 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1894 afs_edit_dir_for_rename_1);
1895
1896 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1897 &vnode->fid, afs_edit_dir_for_rename_2);
1898 }
1899
1900 if (S_ISDIR(vnode->netfs.inode.i_mode) &&
1901 new_dvnode != orig_dvnode &&
1902 test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
1903 afs_edit_dir_update_dotdot(vnode, new_dvnode,
1904 afs_edit_dir_for_rename_sub);
1905
1906 new_inode = d_inode(new_dentry);
1907 if (new_inode) {
1908 spin_lock(&new_inode->i_lock);
1909 if (S_ISDIR(new_inode->i_mode))
1910 clear_nlink(new_inode);
1911 else if (new_inode->i_nlink > 0)
1912 drop_nlink(new_inode);
1913 spin_unlock(&new_inode->i_lock);
1914 }
1915
1916 /* Now we can update d_fsdata on the dentries to reflect their
1917 * new parent's data_version.
1918 *
1919 * Note that if we ever implement RENAME_EXCHANGE, we'll have
1920 * to update both dentries with opposing dir versions.
1921 */
1922 afs_update_dentry_version(op, new_dvp, op->dentry);
1923 afs_update_dentry_version(op, new_dvp, op->dentry_2);
1924
1925 d_move(old_dentry, new_dentry);
1926
1927 up_write(&new_dvnode->validate_lock);
1928}
1929
1930static void afs_rename_put(struct afs_operation *op)
1931{
1932 _enter("op=%08x", op->debug_id);
1933 if (op->rename.rehash)
1934 d_rehash(op->rename.rehash);
1935 dput(op->rename.tmp);
1936 if (afs_op_error(op))
1937 d_rehash(op->dentry);
1938}
1939
1940static const struct afs_operation_ops afs_rename_operation = {
1941 .issue_afs_rpc = afs_fs_rename,
1942 .issue_yfs_rpc = yfs_fs_rename,
1943 .success = afs_rename_success,
1944 .edit_dir = afs_rename_edit_dir,
1945 .put = afs_rename_put,
1946};
1947
1948/*
1949 * rename a file in an AFS filesystem and/or move it between directories
1950 */
1951static int afs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
1952 struct dentry *old_dentry, struct inode *new_dir,
1953 struct dentry *new_dentry, unsigned int flags)
1954{
1955 struct afs_operation *op;
1956 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1957 int ret;
1958
1959 if (flags)
1960 return -EINVAL;
1961
1962 /* Don't allow silly-rename files be moved around. */
1963 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1964 return -EINVAL;
1965
1966 vnode = AFS_FS_I(d_inode(old_dentry));
1967 orig_dvnode = AFS_FS_I(old_dir);
1968 new_dvnode = AFS_FS_I(new_dir);
1969
1970 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1971 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1972 vnode->fid.vid, vnode->fid.vnode,
1973 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1974 new_dentry);
1975
1976 op = afs_alloc_operation(NULL, orig_dvnode->volume);
1977 if (IS_ERR(op))
1978 return PTR_ERR(op);
1979
1980 ret = afs_validate(vnode, op->key);
1981 afs_op_set_error(op, ret);
1982 if (ret < 0)
1983 goto error;
1984
1985 afs_op_set_vnode(op, 0, orig_dvnode);
1986 afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
1987 op->file[0].dv_delta = 1;
1988 op->file[1].dv_delta = 1;
1989 op->file[0].modification = true;
1990 op->file[1].modification = true;
1991 op->file[0].update_ctime = true;
1992 op->file[1].update_ctime = true;
1993
1994 op->dentry = old_dentry;
1995 op->dentry_2 = new_dentry;
1996 op->rename.new_negative = d_is_negative(new_dentry);
1997 op->ops = &afs_rename_operation;
1998
1999 /* For non-directories, check whether the target is busy and if so,
2000 * make a copy of the dentry and then do a silly-rename. If the
2001 * silly-rename succeeds, the copied dentry is hashed and becomes the
2002 * new target.
2003 */
2004 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
2005 /* To prevent any new references to the target during the
2006 * rename, we unhash the dentry in advance.
2007 */
2008 if (!d_unhashed(new_dentry)) {
2009 d_drop(new_dentry);
2010 op->rename.rehash = new_dentry;
2011 }
2012
2013 if (d_count(new_dentry) > 2) {
2014 /* copy the target dentry's name */
2015 op->rename.tmp = d_alloc(new_dentry->d_parent,
2016 &new_dentry->d_name);
2017 if (!op->rename.tmp) {
2018 afs_op_nomem(op);
2019 goto error;
2020 }
2021
2022 ret = afs_sillyrename(new_dvnode,
2023 AFS_FS_I(d_inode(new_dentry)),
2024 new_dentry, op->key);
2025 if (ret) {
2026 afs_op_set_error(op, ret);
2027 goto error;
2028 }
2029
2030 op->dentry_2 = op->rename.tmp;
2031 op->rename.rehash = NULL;
2032 op->rename.new_negative = true;
2033 }
2034 }
2035
2036 /* This bit is potentially nasty as there's a potential race with
2037 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
2038 * to reflect it's new parent's new data_version after the op, but
2039 * d_revalidate may see old_dentry between the op having taken place
2040 * and the version being updated.
2041 *
2042 * So drop the old_dentry for now to make other threads go through
2043 * lookup instead - which we hold a lock against.
2044 */
2045 d_drop(old_dentry);
2046
2047 return afs_do_sync_operation(op);
2048
2049error:
2050 return afs_put_operation(op);
2051}
2052
2053/*
2054 * Release a directory folio and clean up its private state if it's not busy
2055 * - return true if the folio can now be released, false if not
2056 */
2057static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags)
2058{
2059 struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
2060
2061 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio->index);
2062
2063 folio_detach_private(folio);
2064
2065 /* The directory will need reloading. */
2066 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2067 afs_stat_v(dvnode, n_relpg);
2068 return true;
2069}
2070
2071/*
2072 * Invalidate part or all of a folio.
2073 */
2074static void afs_dir_invalidate_folio(struct folio *folio, size_t offset,
2075 size_t length)
2076{
2077 struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
2078
2079 _enter("{%lu},%zu,%zu", folio->index, offset, length);
2080
2081 BUG_ON(!folio_test_locked(folio));
2082
2083 /* The directory will need reloading. */
2084 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2085 afs_stat_v(dvnode, n_inval);
2086
2087 /* we clean up only if the entire folio is being invalidated */
2088 if (offset == 0 && length == folio_size(folio))
2089 folio_detach_private(folio);
2090}