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drm/panfrost: Remove set but not used variable 'bo'
[linux/fpc-iii.git] / fs / afs / dir.c
blob5c794f4b051afcc953f97ceff3b562402a31b4e0
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/task_io_accounting_ops.h>
16 #include "internal.h"
17 #include "afs_fs.h"
18 #include "xdr_fs.h"
19
20 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
21 unsigned int flags);
22 static int afs_dir_open(struct inode *inode, struct file *file);
23 static int afs_readdir(struct file *file, struct dir_context *ctx);
24 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
25 static int afs_d_delete(const struct dentry *dentry);
26 static void afs_d_iput(struct dentry *dentry, struct inode *inode);
27 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
28 loff_t fpos, u64 ino, unsigned dtype);
29 static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
30 loff_t fpos, u64 ino, unsigned dtype);
31 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
32 bool excl);
33 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
34 static int afs_rmdir(struct inode *dir, struct dentry *dentry);
35 static int afs_unlink(struct inode *dir, struct dentry *dentry);
36 static int afs_link(struct dentry *from, struct inode *dir,
37 struct dentry *dentry);
38 static int afs_symlink(struct inode *dir, struct dentry *dentry,
39 const char *content);
40 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
41 struct inode *new_dir, struct dentry *new_dentry,
42 unsigned int flags);
43 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags);
44 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
45 unsigned int length);
46
47 static int afs_dir_set_page_dirty(struct page *page)
48 {
49 BUG(); /* This should never happen. */
50 }
51
52 const struct file_operations afs_dir_file_operations = {
53 .open = afs_dir_open,
54 .release = afs_release,
55 .iterate_shared = afs_readdir,
56 .lock = afs_lock,
57 .llseek = generic_file_llseek,
58 };
59
60 const struct inode_operations afs_dir_inode_operations = {
61 .create = afs_create,
62 .lookup = afs_lookup,
63 .link = afs_link,
64 .unlink = afs_unlink,
65 .symlink = afs_symlink,
66 .mkdir = afs_mkdir,
67 .rmdir = afs_rmdir,
68 .rename = afs_rename,
69 .permission = afs_permission,
70 .getattr = afs_getattr,
71 .setattr = afs_setattr,
72 .listxattr = afs_listxattr,
73 };
74
75 const struct address_space_operations afs_dir_aops = {
76 .set_page_dirty = afs_dir_set_page_dirty,
77 .releasepage = afs_dir_releasepage,
78 .invalidatepage = afs_dir_invalidatepage,
79 };
80
81 const struct dentry_operations afs_fs_dentry_operations = {
82 .d_revalidate = afs_d_revalidate,
83 .d_delete = afs_d_delete,
84 .d_release = afs_d_release,
85 .d_automount = afs_d_automount,
86 .d_iput = afs_d_iput,
87 };
88
89 struct afs_lookup_one_cookie {
90 struct dir_context ctx;
91 struct qstr name;
92 bool found;
93 struct afs_fid fid;
94 };
95
96 struct afs_lookup_cookie {
97 struct dir_context ctx;
98 struct qstr name;
99 bool found;
100 bool one_only;
101 unsigned short nr_fids;
102 struct inode **inodes;
103 struct afs_status_cb *statuses;
104 struct afs_fid fids[50];
105 };
106
107 /*
108 * check that a directory page is valid
109 */
110 static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
111 loff_t i_size)
112 {
113 struct afs_xdr_dir_page *dbuf;
114 loff_t latter, off;
115 int tmp, qty;
116
117 /* Determine how many magic numbers there should be in this page, but
118 * we must take care because the directory may change size under us.
119 */
120 off = page_offset(page);
121 if (i_size <= off)
122 goto checked;
123
124 latter = i_size - off;
125 if (latter >= PAGE_SIZE)
126 qty = PAGE_SIZE;
127 else
128 qty = latter;
129 qty /= sizeof(union afs_xdr_dir_block);
130
131 /* check them */
132 dbuf = kmap(page);
133 for (tmp = 0; tmp < qty; tmp++) {
134 if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
135 printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
136 __func__, dvnode->vfs_inode.i_ino, tmp, qty,
137 ntohs(dbuf->blocks[tmp].hdr.magic));
138 trace_afs_dir_check_failed(dvnode, off, i_size);
139 kunmap(page);
140 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
141 goto error;
142 }
143
144 /* Make sure each block is NUL terminated so we can reasonably
145 * use string functions on it. The filenames in the page
146 * *should* be NUL-terminated anyway.
147 */
148 ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
149 }
150
151 kunmap(page);
152
153 checked:
154 afs_stat_v(dvnode, n_read_dir);
155 return true;
156
157 error:
158 return false;
159 }
160
161 /*
162 * Check the contents of a directory that we've just read.
163 */
164 static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
165 {
166 struct afs_xdr_dir_page *dbuf;
167 unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
168
169 for (i = 0; i < req->nr_pages; i++)
170 if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
171 goto bad;
172 return true;
173
174 bad:
175 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
176 dvnode->fid.vid, dvnode->fid.vnode,
177 req->file_size, req->len, req->actual_len, req->remain);
178 pr_warn("DIR %llx %x %x %x\n",
179 req->pos, req->index, req->nr_pages, req->offset);
180
181 for (i = 0; i < req->nr_pages; i++) {
182 dbuf = kmap(req->pages[i]);
183 for (j = 0; j < qty; j++) {
184 union afs_xdr_dir_block *block = &dbuf->blocks[j];
185
186 pr_warn("[%02x] %32phN\n", i * qty + j, block);
187 }
188 kunmap(req->pages[i]);
189 }
190 return false;
191 }
192
193 /*
194 * open an AFS directory file
195 */
196 static int afs_dir_open(struct inode *inode, struct file *file)
197 {
198 _enter("{%lu}", inode->i_ino);
199
200 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
201 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
202
203 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
204 return -ENOENT;
205
206 return afs_open(inode, file);
207 }
208
209 /*
210 * Read the directory into the pagecache in one go, scrubbing the previous
211 * contents. The list of pages is returned, pinning them so that they don't
212 * get reclaimed during the iteration.
213 */
214 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
215 __acquires(&dvnode->validate_lock)
216 {
217 struct afs_read *req;
218 loff_t i_size;
219 int nr_pages, nr_inline, i, n;
220 int ret = -ENOMEM;
221
222 retry:
223 i_size = i_size_read(&dvnode->vfs_inode);
224 if (i_size < 2048)
225 return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small));
226 if (i_size > 2048 * 1024) {
227 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
228 return ERR_PTR(-EFBIG);
229 }
230
231 _enter("%llu", i_size);
232
233 /* Get a request record to hold the page list. We want to hold it
234 * inline if we can, but we don't want to make an order 1 allocation.
235 */
236 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
237 nr_inline = nr_pages;
238 if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
239 nr_inline = 0;
240
241 req = kzalloc(struct_size(req, array, nr_inline), GFP_KERNEL);
242 if (!req)
243 return ERR_PTR(-ENOMEM);
244
245 refcount_set(&req->usage, 1);
246 req->nr_pages = nr_pages;
247 req->actual_len = i_size; /* May change */
248 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
249 req->data_version = dvnode->status.data_version; /* May change */
250 if (nr_inline > 0) {
251 req->pages = req->array;
252 } else {
253 req->pages = kcalloc(nr_pages, sizeof(struct page *),
254 GFP_KERNEL);
255 if (!req->pages)
256 goto error;
257 }
258
259 /* Get a list of all the pages that hold or will hold the directory
260 * content. We need to fill in any gaps that we might find where the
261 * memory reclaimer has been at work. If there are any gaps, we will
262 * need to reread the entire directory contents.
263 */
264 i = 0;
265 do {
266 n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
267 req->nr_pages - i,
268 req->pages + i);
269 _debug("find %u at %u/%u", n, i, req->nr_pages);
270 if (n == 0) {
271 gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;
272
273 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
274 afs_stat_v(dvnode, n_inval);
275
276 ret = -ENOMEM;
277 req->pages[i] = __page_cache_alloc(gfp);
278 if (!req->pages[i])
279 goto error;
280 ret = add_to_page_cache_lru(req->pages[i],
281 dvnode->vfs_inode.i_mapping,
282 i, gfp);
283 if (ret < 0)
284 goto error;
285
286 set_page_private(req->pages[i], 1);
287 SetPagePrivate(req->pages[i]);
288 unlock_page(req->pages[i]);
289 i++;
290 } else {
291 i += n;
292 }
293 } while (i < req->nr_pages);
294
295 /* If we're going to reload, we need to lock all the pages to prevent
296 * races.
297 */
298 ret = -ERESTARTSYS;
299 if (down_read_killable(&dvnode->validate_lock) < 0)
300 goto error;
301
302 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
303 goto success;
304
305 up_read(&dvnode->validate_lock);
306 if (down_write_killable(&dvnode->validate_lock) < 0)
307 goto error;
308
309 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
310 trace_afs_reload_dir(dvnode);
311 ret = afs_fetch_data(dvnode, key, req);
312 if (ret < 0)
313 goto error_unlock;
314
315 task_io_account_read(PAGE_SIZE * req->nr_pages);
316
317 if (req->len < req->file_size)
318 goto content_has_grown;
319
320 /* Validate the data we just read. */
321 ret = -EIO;
322 if (!afs_dir_check_pages(dvnode, req))
323 goto error_unlock;
324
325 // TODO: Trim excess pages
326
327 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
328 }
329
330 downgrade_write(&dvnode->validate_lock);
331 success:
332 return req;
333
334 error_unlock:
335 up_write(&dvnode->validate_lock);
336 error:
337 afs_put_read(req);
338 _leave(" = %d", ret);
339 return ERR_PTR(ret);
340
341 content_has_grown:
342 up_write(&dvnode->validate_lock);
343 afs_put_read(req);
344 goto retry;
345 }
346
347 /*
348 * deal with one block in an AFS directory
349 */
350 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
351 struct dir_context *ctx,
352 union afs_xdr_dir_block *block,
353 unsigned blkoff)
354 {
355 union afs_xdr_dirent *dire;
356 unsigned offset, next, curr;
357 size_t nlen;
358 int tmp;
359
360 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
361
362 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
363
364 /* walk through the block, an entry at a time */
365 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
366 offset < AFS_DIR_SLOTS_PER_BLOCK;
367 offset = next
368 ) {
369 next = offset + 1;
370
371 /* skip entries marked unused in the bitmap */
372 if (!(block->hdr.bitmap[offset / 8] &
373 (1 << (offset % 8)))) {
374 _debug("ENT[%zu.%u]: unused",
375 blkoff / sizeof(union afs_xdr_dir_block), offset);
376 if (offset >= curr)
377 ctx->pos = blkoff +
378 next * sizeof(union afs_xdr_dirent);
379 continue;
380 }
381
382 /* got a valid entry */
383 dire = &block->dirents[offset];
384 nlen = strnlen(dire->u.name,
385 sizeof(*block) -
386 offset * sizeof(union afs_xdr_dirent));
387
388 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
389 blkoff / sizeof(union afs_xdr_dir_block), offset,
390 (offset < curr ? "skip" : "fill"),
391 nlen, dire->u.name);
392
393 /* work out where the next possible entry is */
394 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) {
395 if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
396 _debug("ENT[%zu.%u]:"
397 " %u travelled beyond end dir block"
398 " (len %u/%zu)",
399 blkoff / sizeof(union afs_xdr_dir_block),
400 offset, next, tmp, nlen);
401 return afs_bad(dvnode, afs_file_error_dir_over_end);
402 }
403 if (!(block->hdr.bitmap[next / 8] &
404 (1 << (next % 8)))) {
405 _debug("ENT[%zu.%u]:"
406 " %u unmarked extension (len %u/%zu)",
407 blkoff / sizeof(union afs_xdr_dir_block),
408 offset, next, tmp, nlen);
409 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
410 }
411
412 _debug("ENT[%zu.%u]: ext %u/%zu",
413 blkoff / sizeof(union afs_xdr_dir_block),
414 next, tmp, nlen);
415 next++;
416 }
417
418 /* skip if starts before the current position */
419 if (offset < curr)
420 continue;
421
422 /* found the next entry */
423 if (!dir_emit(ctx, dire->u.name, nlen,
424 ntohl(dire->u.vnode),
425 (ctx->actor == afs_lookup_filldir ||
426 ctx->actor == afs_lookup_one_filldir)?
427 ntohl(dire->u.unique) : DT_UNKNOWN)) {
428 _leave(" = 0 [full]");
429 return 0;
430 }
431
432 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
433 }
434
435 _leave(" = 1 [more]");
436 return 1;
437 }
438
439 /*
440 * iterate through the data blob that lists the contents of an AFS directory
441 */
442 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
443 struct key *key, afs_dataversion_t *_dir_version)
444 {
445 struct afs_vnode *dvnode = AFS_FS_I(dir);
446 struct afs_xdr_dir_page *dbuf;
447 union afs_xdr_dir_block *dblock;
448 struct afs_read *req;
449 struct page *page;
450 unsigned blkoff, limit;
451 int ret;
452
453 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
454
455 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
456 _leave(" = -ESTALE");
457 return -ESTALE;
458 }
459
460 req = afs_read_dir(dvnode, key);
461 if (IS_ERR(req))
462 return PTR_ERR(req);
463 *_dir_version = req->data_version;
464
465 /* round the file position up to the next entry boundary */
466 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
467 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
468
469 /* walk through the blocks in sequence */
470 ret = 0;
471 while (ctx->pos < req->actual_len) {
472 blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
473
474 /* Fetch the appropriate page from the directory and re-add it
475 * to the LRU.
476 */
477 page = req->pages[blkoff / PAGE_SIZE];
478 if (!page) {
479 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
480 break;
481 }
482 mark_page_accessed(page);
483
484 limit = blkoff & ~(PAGE_SIZE - 1);
485
486 dbuf = kmap(page);
487
488 /* deal with the individual blocks stashed on this page */
489 do {
490 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
491 sizeof(union afs_xdr_dir_block)];
492 ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff);
493 if (ret != 1) {
494 kunmap(page);
495 goto out;
496 }
497
498 blkoff += sizeof(union afs_xdr_dir_block);
499
500 } while (ctx->pos < dir->i_size && blkoff < limit);
501
502 kunmap(page);
503 ret = 0;
504 }
505
506 out:
507 up_read(&dvnode->validate_lock);
508 afs_put_read(req);
509 _leave(" = %d", ret);
510 return ret;
511 }
512
513 /*
514 * read an AFS directory
515 */
516 static int afs_readdir(struct file *file, struct dir_context *ctx)
517 {
518 afs_dataversion_t dir_version;
519
520 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
521 &dir_version);
522 }
523
524 /*
525 * Search the directory for a single name
526 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
527 * uniquifier through dtype
528 */
529 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
530 int nlen, loff_t fpos, u64 ino, unsigned dtype)
531 {
532 struct afs_lookup_one_cookie *cookie =
533 container_of(ctx, struct afs_lookup_one_cookie, ctx);
534
535 _enter("{%s,%u},%s,%u,,%llu,%u",
536 cookie->name.name, cookie->name.len, name, nlen,
537 (unsigned long long) ino, dtype);
538
539 /* insanity checks first */
540 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
541 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
542
543 if (cookie->name.len != nlen ||
544 memcmp(cookie->name.name, name, nlen) != 0) {
545 _leave(" = 0 [no]");
546 return 0;
547 }
548
549 cookie->fid.vnode = ino;
550 cookie->fid.unique = dtype;
551 cookie->found = 1;
552
553 _leave(" = -1 [found]");
554 return -1;
555 }
556
557 /*
558 * Do a lookup of a single name in a directory
559 * - just returns the FID the dentry name maps to if found
560 */
561 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
562 struct afs_fid *fid, struct key *key,
563 afs_dataversion_t *_dir_version)
564 {
565 struct afs_super_info *as = dir->i_sb->s_fs_info;
566 struct afs_lookup_one_cookie cookie = {
567 .ctx.actor = afs_lookup_one_filldir,
568 .name = dentry->d_name,
569 .fid.vid = as->volume->vid
570 };
571 int ret;
572
573 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
574
575 /* search the directory */
576 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
577 if (ret < 0) {
578 _leave(" = %d [iter]", ret);
579 return ret;
580 }
581
582 ret = -ENOENT;
583 if (!cookie.found) {
584 _leave(" = -ENOENT [not found]");
585 return -ENOENT;
586 }
587
588 *fid = cookie.fid;
589 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
590 return 0;
591 }
592
593 /*
594 * search the directory for a name
595 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
596 * uniquifier through dtype
597 */
598 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
599 int nlen, loff_t fpos, u64 ino, unsigned dtype)
600 {
601 struct afs_lookup_cookie *cookie =
602 container_of(ctx, struct afs_lookup_cookie, ctx);
603 int ret;
604
605 _enter("{%s,%u},%s,%u,,%llu,%u",
606 cookie->name.name, cookie->name.len, name, nlen,
607 (unsigned long long) ino, dtype);
608
609 /* insanity checks first */
610 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
611 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
612
613 if (cookie->found) {
614 if (cookie->nr_fids < 50) {
615 cookie->fids[cookie->nr_fids].vnode = ino;
616 cookie->fids[cookie->nr_fids].unique = dtype;
617 cookie->nr_fids++;
618 }
619 } else if (cookie->name.len == nlen &&
620 memcmp(cookie->name.name, name, nlen) == 0) {
621 cookie->fids[0].vnode = ino;
622 cookie->fids[0].unique = dtype;
623 cookie->found = 1;
624 if (cookie->one_only)
625 return -1;
626 }
627
628 ret = cookie->nr_fids >= 50 ? -1 : 0;
629 _leave(" = %d", ret);
630 return ret;
631 }
632
633 /*
634 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
635 * files in one go and create inodes for them. The inode of the file we were
636 * asked for is returned.
637 */
638 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
639 struct key *key)
640 {
641 struct afs_lookup_cookie *cookie;
642 struct afs_cb_interest *dcbi, *cbi = NULL;
643 struct afs_super_info *as = dir->i_sb->s_fs_info;
644 struct afs_status_cb *scb;
645 struct afs_iget_data iget_data;
646 struct afs_fs_cursor fc;
647 struct afs_server *server;
648 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
649 struct inode *inode = NULL, *ti;
650 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
651 int ret, i;
652
653 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
654
655 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
656 if (!cookie)
657 return ERR_PTR(-ENOMEM);
658
659 cookie->ctx.actor = afs_lookup_filldir;
660 cookie->name = dentry->d_name;
661 cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */
662
663 read_seqlock_excl(&dvnode->cb_lock);
664 dcbi = rcu_dereference_protected(dvnode->cb_interest,
665 lockdep_is_held(&dvnode->cb_lock.lock));
666 if (dcbi) {
667 server = dcbi->server;
668 if (server &&
669 test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
670 cookie->one_only = true;
671 }
672 read_sequnlock_excl(&dvnode->cb_lock);
673
674 for (i = 0; i < 50; i++)
675 cookie->fids[i].vid = as->volume->vid;
676
677 /* search the directory */
678 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
679 if (ret < 0) {
680 inode = ERR_PTR(ret);
681 goto out;
682 }
683
684 dentry->d_fsdata = (void *)(unsigned long)data_version;
685
686 inode = ERR_PTR(-ENOENT);
687 if (!cookie->found)
688 goto out;
689
690 /* Check to see if we already have an inode for the primary fid. */
691 iget_data.fid = cookie->fids[0];
692 iget_data.volume = dvnode->volume;
693 iget_data.cb_v_break = dvnode->volume->cb_v_break;
694 iget_data.cb_s_break = 0;
695 inode = ilookup5(dir->i_sb, cookie->fids[0].vnode,
696 afs_iget5_test, &iget_data);
697 if (inode)
698 goto out;
699
700 /* Need space for examining all the selected files */
701 inode = ERR_PTR(-ENOMEM);
702 cookie->statuses = kvcalloc(cookie->nr_fids, sizeof(struct afs_status_cb),
703 GFP_KERNEL);
704 if (!cookie->statuses)
705 goto out;
706
707 cookie->inodes = kcalloc(cookie->nr_fids, sizeof(struct inode *),
708 GFP_KERNEL);
709 if (!cookie->inodes)
710 goto out_s;
711
712 for (i = 1; i < cookie->nr_fids; i++) {
713 scb = &cookie->statuses[i];
714
715 /* Find any inodes that already exist and get their
716 * callback counters.
717 */
718 iget_data.fid = cookie->fids[i];
719 ti = ilookup5_nowait(dir->i_sb, iget_data.fid.vnode,
720 afs_iget5_test, &iget_data);
721 if (!IS_ERR_OR_NULL(ti)) {
722 vnode = AFS_FS_I(ti);
723 scb->cb_break = afs_calc_vnode_cb_break(vnode);
724 cookie->inodes[i] = ti;
725 }
726 }
727
728 /* Try FS.InlineBulkStatus first. Abort codes for the individual
729 * lookups contained therein are stored in the reply without aborting
730 * the whole operation.
731 */
732 if (cookie->one_only)
733 goto no_inline_bulk_status;
734
735 inode = ERR_PTR(-ERESTARTSYS);
736 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
737 while (afs_select_fileserver(&fc)) {
738 if (test_bit(AFS_SERVER_FL_NO_IBULK,
739 &fc.cbi->server->flags)) {
740 fc.ac.abort_code = RX_INVALID_OPERATION;
741 fc.ac.error = -ECONNABORTED;
742 break;
743 }
744 iget_data.cb_v_break = dvnode->volume->cb_v_break;
745 iget_data.cb_s_break = fc.cbi->server->cb_s_break;
746 afs_fs_inline_bulk_status(&fc,
747 afs_v2net(dvnode),
748 cookie->fids,
749 cookie->statuses,
750 cookie->nr_fids, NULL);
751 }
752
753 if (fc.ac.error == 0)
754 cbi = afs_get_cb_interest(fc.cbi);
755 if (fc.ac.abort_code == RX_INVALID_OPERATION)
756 set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags);
757 inode = ERR_PTR(afs_end_vnode_operation(&fc));
758 }
759
760 if (!IS_ERR(inode))
761 goto success;
762 if (fc.ac.abort_code != RX_INVALID_OPERATION)
763 goto out_c;
764
765 no_inline_bulk_status:
766 /* We could try FS.BulkStatus next, but this aborts the entire op if
767 * any of the lookups fails - so, for the moment, revert to
768 * FS.FetchStatus for just the primary fid.
769 */
770 inode = ERR_PTR(-ERESTARTSYS);
771 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
772 while (afs_select_fileserver(&fc)) {
773 iget_data.cb_v_break = dvnode->volume->cb_v_break;
774 iget_data.cb_s_break = fc.cbi->server->cb_s_break;
775 scb = &cookie->statuses[0];
776 afs_fs_fetch_status(&fc,
777 afs_v2net(dvnode),
778 cookie->fids,
779 scb,
780 NULL);
781 }
782
783 if (fc.ac.error == 0)
784 cbi = afs_get_cb_interest(fc.cbi);
785 inode = ERR_PTR(afs_end_vnode_operation(&fc));
786 }
787
788 if (IS_ERR(inode))
789 goto out_c;
790
791 success:
792 /* Turn all the files into inodes and save the first one - which is the
793 * one we actually want.
794 */
795 scb = &cookie->statuses[0];
796 if (scb->status.abort_code != 0)
797 inode = ERR_PTR(afs_abort_to_error(scb->status.abort_code));
798
799 for (i = 0; i < cookie->nr_fids; i++) {
800 struct afs_status_cb *scb = &cookie->statuses[i];
801
802 if (!scb->have_status && !scb->have_error)
803 continue;
804
805 if (cookie->inodes[i]) {
806 struct afs_vnode *iv = AFS_FS_I(cookie->inodes[i]);
807
808 if (test_bit(AFS_VNODE_UNSET, &iv->flags))
809 continue;
810
811 afs_vnode_commit_status(&fc, iv,
812 scb->cb_break, NULL, scb);
813 continue;
814 }
815
816 if (scb->status.abort_code != 0)
817 continue;
818
819 iget_data.fid = cookie->fids[i];
820 ti = afs_iget(dir->i_sb, key, &iget_data, scb, cbi, dvnode);
821 if (!IS_ERR(ti))
822 afs_cache_permit(AFS_FS_I(ti), key,
823 0 /* Assume vnode->cb_break is 0 */ +
824 iget_data.cb_v_break,
825 scb);
826 if (i == 0) {
827 inode = ti;
828 } else {
829 if (!IS_ERR(ti))
830 iput(ti);
831 }
832 }
833
834 out_c:
835 afs_put_cb_interest(afs_v2net(dvnode), cbi);
836 if (cookie->inodes) {
837 for (i = 0; i < cookie->nr_fids; i++)
838 iput(cookie->inodes[i]);
839 kfree(cookie->inodes);
840 }
841 out_s:
842 kvfree(cookie->statuses);
843 out:
844 kfree(cookie);
845 return inode;
846 }
847
848 /*
849 * Look up an entry in a directory with @sys substitution.
850 */
851 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
852 struct key *key)
853 {
854 struct afs_sysnames *subs;
855 struct afs_net *net = afs_i2net(dir);
856 struct dentry *ret;
857 char *buf, *p, *name;
858 int len, i;
859
860 _enter("");
861
862 ret = ERR_PTR(-ENOMEM);
863 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
864 if (!buf)
865 goto out_p;
866 if (dentry->d_name.len > 4) {
867 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
868 p += dentry->d_name.len - 4;
869 }
870
871 /* There is an ordered list of substitutes that we have to try. */
872 read_lock(&net->sysnames_lock);
873 subs = net->sysnames;
874 refcount_inc(&subs->usage);
875 read_unlock(&net->sysnames_lock);
876
877 for (i = 0; i < subs->nr; i++) {
878 name = subs->subs[i];
879 len = dentry->d_name.len - 4 + strlen(name);
880 if (len >= AFSNAMEMAX) {
881 ret = ERR_PTR(-ENAMETOOLONG);
882 goto out_s;
883 }
884
885 strcpy(p, name);
886 ret = lookup_one_len(buf, dentry->d_parent, len);
887 if (IS_ERR(ret) || d_is_positive(ret))
888 goto out_s;
889 dput(ret);
890 }
891
892 /* We don't want to d_add() the @sys dentry here as we don't want to
893 * the cached dentry to hide changes to the sysnames list.
894 */
895 ret = NULL;
896 out_s:
897 afs_put_sysnames(subs);
898 kfree(buf);
899 out_p:
900 key_put(key);
901 return ret;
902 }
903
904 /*
905 * look up an entry in a directory
906 */
907 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
908 unsigned int flags)
909 {
910 struct afs_vnode *dvnode = AFS_FS_I(dir);
911 struct afs_fid fid = {};
912 struct inode *inode;
913 struct dentry *d;
914 struct key *key;
915 int ret;
916
917 _enter("{%llx:%llu},%p{%pd},",
918 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
919
920 ASSERTCMP(d_inode(dentry), ==, NULL);
921
922 if (dentry->d_name.len >= AFSNAMEMAX) {
923 _leave(" = -ENAMETOOLONG");
924 return ERR_PTR(-ENAMETOOLONG);
925 }
926
927 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
928 _leave(" = -ESTALE");
929 return ERR_PTR(-ESTALE);
930 }
931
932 key = afs_request_key(dvnode->volume->cell);
933 if (IS_ERR(key)) {
934 _leave(" = %ld [key]", PTR_ERR(key));
935 return ERR_CAST(key);
936 }
937
938 ret = afs_validate(dvnode, key);
939 if (ret < 0) {
940 key_put(key);
941 _leave(" = %d [val]", ret);
942 return ERR_PTR(ret);
943 }
944
945 if (dentry->d_name.len >= 4 &&
946 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
947 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
948 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
949 dentry->d_name.name[dentry->d_name.len - 1] == 's')
950 return afs_lookup_atsys(dir, dentry, key);
951
952 afs_stat_v(dvnode, n_lookup);
953 inode = afs_do_lookup(dir, dentry, key);
954 key_put(key);
955 if (inode == ERR_PTR(-ENOENT))
956 inode = afs_try_auto_mntpt(dentry, dir);
957
958 if (!IS_ERR_OR_NULL(inode))
959 fid = AFS_FS_I(inode)->fid;
960
961 d = d_splice_alias(inode, dentry);
962 if (!IS_ERR_OR_NULL(d)) {
963 d->d_fsdata = dentry->d_fsdata;
964 trace_afs_lookup(dvnode, &d->d_name, &fid);
965 } else {
966 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
967 }
968 return d;
969 }
970
971 /*
972 * Check the validity of a dentry under RCU conditions.
973 */
974 static int afs_d_revalidate_rcu(struct dentry *dentry)
975 {
976 struct afs_vnode *dvnode, *vnode;
977 struct dentry *parent;
978 struct inode *dir, *inode;
979 long dir_version, de_version;
980
981 _enter("%p", dentry);
982
983 /* Check the parent directory is still valid first. */
984 parent = READ_ONCE(dentry->d_parent);
985 dir = d_inode_rcu(parent);
986 if (!dir)
987 return -ECHILD;
988 dvnode = AFS_FS_I(dir);
989 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
990 return -ECHILD;
991
992 if (!afs_check_validity(dvnode))
993 return -ECHILD;
994
995 /* We only need to invalidate a dentry if the server's copy changed
996 * behind our back. If we made the change, it's no problem. Note that
997 * on a 32-bit system, we only have 32 bits in the dentry to store the
998 * version.
999 */
1000 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1001 de_version = (long)READ_ONCE(dentry->d_fsdata);
1002 if (de_version != dir_version) {
1003 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1004 if (de_version - dir_version < 0)
1005 return -ECHILD;
1006 }
1007
1008 /* Check to see if the vnode referred to by the dentry still
1009 * has a callback.
1010 */
1011 if (d_really_is_positive(dentry)) {
1012 inode = d_inode_rcu(dentry);
1013 if (inode) {
1014 vnode = AFS_FS_I(inode);
1015 if (!afs_check_validity(vnode))
1016 return -ECHILD;
1017 }
1018 }
1019
1020 return 1; /* Still valid */
1021 }
1022
1023 /*
1024 * check that a dentry lookup hit has found a valid entry
1025 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1026 * inode
1027 */
1028 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
1029 {
1030 struct afs_vnode *vnode, *dir;
1031 struct afs_fid uninitialized_var(fid);
1032 struct dentry *parent;
1033 struct inode *inode;
1034 struct key *key;
1035 afs_dataversion_t dir_version;
1036 long de_version;
1037 int ret;
1038
1039 if (flags & LOOKUP_RCU)
1040 return afs_d_revalidate_rcu(dentry);
1041
1042 if (d_really_is_positive(dentry)) {
1043 vnode = AFS_FS_I(d_inode(dentry));
1044 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1045 vnode->fid.vid, vnode->fid.vnode, dentry,
1046 vnode->flags);
1047 } else {
1048 _enter("{neg n=%pd}", dentry);
1049 }
1050
1051 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1052 if (IS_ERR(key))
1053 key = NULL;
1054
1055 if (d_really_is_positive(dentry)) {
1056 inode = d_inode(dentry);
1057 if (inode) {
1058 vnode = AFS_FS_I(inode);
1059 afs_validate(vnode, key);
1060 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1061 goto out_bad;
1062 }
1063 }
1064
1065 /* lock down the parent dentry so we can peer at it */
1066 parent = dget_parent(dentry);
1067 dir = AFS_FS_I(d_inode(parent));
1068
1069 /* validate the parent directory */
1070 afs_validate(dir, key);
1071
1072 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1073 _debug("%pd: parent dir deleted", dentry);
1074 goto out_bad_parent;
1075 }
1076
1077 /* We only need to invalidate a dentry if the server's copy changed
1078 * behind our back. If we made the change, it's no problem. Note that
1079 * on a 32-bit system, we only have 32 bits in the dentry to store the
1080 * version.
1081 */
1082 dir_version = dir->status.data_version;
1083 de_version = (long)dentry->d_fsdata;
1084 if (de_version == (long)dir_version)
1085 goto out_valid_noupdate;
1086
1087 dir_version = dir->invalid_before;
1088 if (de_version - (long)dir_version >= 0)
1089 goto out_valid;
1090
1091 _debug("dir modified");
1092 afs_stat_v(dir, n_reval);
1093
1094 /* search the directory for this vnode */
1095 ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version);
1096 switch (ret) {
1097 case 0:
1098 /* the filename maps to something */
1099 if (d_really_is_negative(dentry))
1100 goto out_bad_parent;
1101 inode = d_inode(dentry);
1102 if (is_bad_inode(inode)) {
1103 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1104 dentry);
1105 goto out_bad_parent;
1106 }
1107
1108 vnode = AFS_FS_I(inode);
1109
1110 /* if the vnode ID has changed, then the dirent points to a
1111 * different file */
1112 if (fid.vnode != vnode->fid.vnode) {
1113 _debug("%pd: dirent changed [%llu != %llu]",
1114 dentry, fid.vnode,
1115 vnode->fid.vnode);
1116 goto not_found;
1117 }
1118
1119 /* if the vnode ID uniqifier has changed, then the file has
1120 * been deleted and replaced, and the original vnode ID has
1121 * been reused */
1122 if (fid.unique != vnode->fid.unique) {
1123 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1124 dentry, fid.unique,
1125 vnode->fid.unique,
1126 vnode->vfs_inode.i_generation);
1127 write_seqlock(&vnode->cb_lock);
1128 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1129 write_sequnlock(&vnode->cb_lock);
1130 goto not_found;
1131 }
1132 goto out_valid;
1133
1134 case -ENOENT:
1135 /* the filename is unknown */
1136 _debug("%pd: dirent not found", dentry);
1137 if (d_really_is_positive(dentry))
1138 goto not_found;
1139 goto out_valid;
1140
1141 default:
1142 _debug("failed to iterate dir %pd: %d",
1143 parent, ret);
1144 goto out_bad_parent;
1145 }
1146
1147 out_valid:
1148 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1149 out_valid_noupdate:
1150 dput(parent);
1151 key_put(key);
1152 _leave(" = 1 [valid]");
1153 return 1;
1154
1155 /* the dirent, if it exists, now points to a different vnode */
1156 not_found:
1157 spin_lock(&dentry->d_lock);
1158 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
1159 spin_unlock(&dentry->d_lock);
1160
1161 out_bad_parent:
1162 _debug("dropping dentry %pd2", dentry);
1163 dput(parent);
1164 out_bad:
1165 key_put(key);
1166
1167 _leave(" = 0 [bad]");
1168 return 0;
1169 }
1170
1171 /*
1172 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1173 * sleep)
1174 * - called from dput() when d_count is going to 0.
1175 * - return 1 to request dentry be unhashed, 0 otherwise
1176 */
1177 static int afs_d_delete(const struct dentry *dentry)
1178 {
1179 _enter("%pd", dentry);
1180
1181 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1182 goto zap;
1183
1184 if (d_really_is_positive(dentry) &&
1185 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1186 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1187 goto zap;
1188
1189 _leave(" = 0 [keep]");
1190 return 0;
1191
1192 zap:
1193 _leave(" = 1 [zap]");
1194 return 1;
1195 }
1196
1197 /*
1198 * Clean up sillyrename files on dentry removal.
1199 */
1200 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1201 {
1202 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1203 afs_silly_iput(dentry, inode);
1204 iput(inode);
1205 }
1206
1207 /*
1208 * handle dentry release
1209 */
1210 void afs_d_release(struct dentry *dentry)
1211 {
1212 _enter("%pd", dentry);
1213 }
1214
1215 /*
1216 * Create a new inode for create/mkdir/symlink
1217 */
1218 static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
1219 struct dentry *new_dentry,
1220 struct afs_iget_data *new_data,
1221 struct afs_status_cb *new_scb)
1222 {
1223 struct afs_vnode *vnode;
1224 struct inode *inode;
1225
1226 if (fc->ac.error < 0)
1227 return;
1228
1229 inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
1230 new_data, new_scb, fc->cbi, fc->vnode);
1231 if (IS_ERR(inode)) {
1232 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1233 * the new directory on the server.
1234 */
1235 fc->ac.error = PTR_ERR(inode);
1236 return;
1237 }
1238
1239 vnode = AFS_FS_I(inode);
1240 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1241 if (fc->ac.error == 0)
1242 afs_cache_permit(vnode, fc->key, vnode->cb_break, new_scb);
1243 d_instantiate(new_dentry, inode);
1244 }
1245
1246 static void afs_prep_for_new_inode(struct afs_fs_cursor *fc,
1247 struct afs_iget_data *iget_data)
1248 {
1249 iget_data->volume = fc->vnode->volume;
1250 iget_data->cb_v_break = fc->vnode->volume->cb_v_break;
1251 iget_data->cb_s_break = fc->cbi->server->cb_s_break;
1252 }
1253
1254 /*
1255 * Note that a dentry got changed. We need to set d_fsdata to the data version
1256 * number derived from the result of the operation. It doesn't matter if
1257 * d_fsdata goes backwards as we'll just revalidate.
1258 */
1259 static void afs_update_dentry_version(struct afs_fs_cursor *fc,
1260 struct dentry *dentry,
1261 struct afs_status_cb *scb)
1262 {
1263 if (fc->ac.error == 0)
1264 dentry->d_fsdata =
1265 (void *)(unsigned long)scb->status.data_version;
1266 }
1267
1268 /*
1269 * create a directory on an AFS filesystem
1270 */
1271 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1272 {
1273 struct afs_iget_data iget_data;
1274 struct afs_status_cb *scb;
1275 struct afs_fs_cursor fc;
1276 struct afs_vnode *dvnode = AFS_FS_I(dir);
1277 struct key *key;
1278 int ret;
1279
1280 mode |= S_IFDIR;
1281
1282 _enter("{%llx:%llu},{%pd},%ho",
1283 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1284
1285 ret = -ENOMEM;
1286 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1287 if (!scb)
1288 goto error;
1289
1290 key = afs_request_key(dvnode->volume->cell);
1291 if (IS_ERR(key)) {
1292 ret = PTR_ERR(key);
1293 goto error_scb;
1294 }
1295
1296 ret = -ERESTARTSYS;
1297 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1298 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1299
1300 while (afs_select_fileserver(&fc)) {
1301 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1302 afs_prep_for_new_inode(&fc, &iget_data);
1303 afs_fs_create(&fc, dentry->d_name.name, mode,
1304 &scb[0], &iget_data.fid, &scb[1]);
1305 }
1306
1307 afs_check_for_remote_deletion(&fc, dvnode);
1308 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1309 &data_version, &scb[0]);
1310 afs_update_dentry_version(&fc, dentry, &scb[0]);
1311 afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
1312 ret = afs_end_vnode_operation(&fc);
1313 if (ret < 0)
1314 goto error_key;
1315 } else {
1316 goto error_key;
1317 }
1318
1319 if (ret == 0 &&
1320 test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1321 afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
1322 afs_edit_dir_for_create);
1323
1324 key_put(key);
1325 kfree(scb);
1326 _leave(" = 0");
1327 return 0;
1328
1329 error_key:
1330 key_put(key);
1331 error_scb:
1332 kfree(scb);
1333 error:
1334 d_drop(dentry);
1335 _leave(" = %d", ret);
1336 return ret;
1337 }
1338
1339 /*
1340 * Remove a subdir from a directory.
1341 */
1342 static void afs_dir_remove_subdir(struct dentry *dentry)
1343 {
1344 if (d_really_is_positive(dentry)) {
1345 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1346
1347 clear_nlink(&vnode->vfs_inode);
1348 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1349 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1350 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1351 }
1352 }
1353
1354 /*
1355 * remove a directory from an AFS filesystem
1356 */
1357 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1358 {
1359 struct afs_status_cb *scb;
1360 struct afs_fs_cursor fc;
1361 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1362 struct key *key;
1363 int ret;
1364
1365 _enter("{%llx:%llu},{%pd}",
1366 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1367
1368 scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
1369 if (!scb)
1370 return -ENOMEM;
1371
1372 key = afs_request_key(dvnode->volume->cell);
1373 if (IS_ERR(key)) {
1374 ret = PTR_ERR(key);
1375 goto error;
1376 }
1377
1378 /* Try to make sure we have a callback promise on the victim. */
1379 if (d_really_is_positive(dentry)) {
1380 vnode = AFS_FS_I(d_inode(dentry));
1381 ret = afs_validate(vnode, key);
1382 if (ret < 0)
1383 goto error_key;
1384 }
1385
1386 if (vnode) {
1387 ret = down_write_killable(&vnode->rmdir_lock);
1388 if (ret < 0)
1389 goto error_key;
1390 }
1391
1392 ret = -ERESTARTSYS;
1393 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1394 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1395
1396 while (afs_select_fileserver(&fc)) {
1397 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1398 afs_fs_remove(&fc, vnode, dentry->d_name.name, true, scb);
1399 }
1400
1401 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1402 &data_version, scb);
1403 afs_update_dentry_version(&fc, dentry, scb);
1404 ret = afs_end_vnode_operation(&fc);
1405 if (ret == 0) {
1406 afs_dir_remove_subdir(dentry);
1407 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1408 afs_edit_dir_remove(dvnode, &dentry->d_name,
1409 afs_edit_dir_for_rmdir);
1410 }
1411 }
1412
1413 if (vnode)
1414 up_write(&vnode->rmdir_lock);
1415 error_key:
1416 key_put(key);
1417 error:
1418 kfree(scb);
1419 return ret;
1420 }
1421
1422 /*
1423 * Remove a link to a file or symlink from a directory.
1424 *
1425 * If the file was not deleted due to excess hard links, the fileserver will
1426 * break the callback promise on the file - if it had one - before it returns
1427 * to us, and if it was deleted, it won't
1428 *
1429 * However, if we didn't have a callback promise outstanding, or it was
1430 * outstanding on a different server, then it won't break it either...
1431 */
1432 static int afs_dir_remove_link(struct afs_vnode *dvnode, struct dentry *dentry,
1433 struct key *key)
1434 {
1435 int ret = 0;
1436
1437 if (d_really_is_positive(dentry)) {
1438 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1439
1440 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1441 /* Already done */
1442 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1443 write_seqlock(&vnode->cb_lock);
1444 drop_nlink(&vnode->vfs_inode);
1445 if (vnode->vfs_inode.i_nlink == 0) {
1446 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1447 __afs_break_callback(vnode, afs_cb_break_for_unlink);
1448 }
1449 write_sequnlock(&vnode->cb_lock);
1450 ret = 0;
1451 } else {
1452 afs_break_callback(vnode, afs_cb_break_for_unlink);
1453
1454 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1455 kdebug("AFS_VNODE_DELETED");
1456
1457 ret = afs_validate(vnode, key);
1458 if (ret == -ESTALE)
1459 ret = 0;
1460 }
1461 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
1462 }
1463
1464 return ret;
1465 }
1466
1467 /*
1468 * Remove a file or symlink from an AFS filesystem.
1469 */
1470 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1471 {
1472 struct afs_fs_cursor fc;
1473 struct afs_status_cb *scb;
1474 struct afs_vnode *dvnode = AFS_FS_I(dir);
1475 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1476 struct key *key;
1477 bool need_rehash = false;
1478 int ret;
1479
1480 _enter("{%llx:%llu},{%pd}",
1481 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1482
1483 if (dentry->d_name.len >= AFSNAMEMAX)
1484 return -ENAMETOOLONG;
1485
1486 ret = -ENOMEM;
1487 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1488 if (!scb)
1489 goto error;
1490
1491 key = afs_request_key(dvnode->volume->cell);
1492 if (IS_ERR(key)) {
1493 ret = PTR_ERR(key);
1494 goto error_scb;
1495 }
1496
1497 /* Try to make sure we have a callback promise on the victim. */
1498 ret = afs_validate(vnode, key);
1499 if (ret < 0)
1500 goto error_key;
1501
1502 spin_lock(&dentry->d_lock);
1503 if (d_count(dentry) > 1) {
1504 spin_unlock(&dentry->d_lock);
1505 /* Start asynchronous writeout of the inode */
1506 write_inode_now(d_inode(dentry), 0);
1507 ret = afs_sillyrename(dvnode, vnode, dentry, key);
1508 goto error_key;
1509 }
1510 if (!d_unhashed(dentry)) {
1511 /* Prevent a race with RCU lookup. */
1512 __d_drop(dentry);
1513 need_rehash = true;
1514 }
1515 spin_unlock(&dentry->d_lock);
1516
1517 ret = -ERESTARTSYS;
1518 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1519 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1520 afs_dataversion_t data_version_2 = vnode->status.data_version;
1521
1522 while (afs_select_fileserver(&fc)) {
1523 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1524 fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
1525
1526 if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) &&
1527 !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) {
1528 yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name,
1529 &scb[0], &scb[1]);
1530 if (fc.ac.error != -ECONNABORTED ||
1531 fc.ac.abort_code != RXGEN_OPCODE)
1532 continue;
1533 set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags);
1534 }
1535
1536 afs_fs_remove(&fc, vnode, dentry->d_name.name, false, &scb[0]);
1537 }
1538
1539 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1540 &data_version, &scb[0]);
1541 afs_vnode_commit_status(&fc, vnode, fc.cb_break_2,
1542 &data_version_2, &scb[1]);
1543 afs_update_dentry_version(&fc, dentry, &scb[0]);
1544 ret = afs_end_vnode_operation(&fc);
1545 if (ret == 0 && !(scb[1].have_status || scb[1].have_error))
1546 ret = afs_dir_remove_link(dvnode, dentry, key);
1547 if (ret == 0 &&
1548 test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1549 afs_edit_dir_remove(dvnode, &dentry->d_name,
1550 afs_edit_dir_for_unlink);
1551 }
1552
1553 if (need_rehash && ret < 0 && ret != -ENOENT)
1554 d_rehash(dentry);
1555
1556 error_key:
1557 key_put(key);
1558 error_scb:
1559 kfree(scb);
1560 error:
1561 _leave(" = %d", ret);
1562 return ret;
1563 }
1564
1565 /*
1566 * create a regular file on an AFS filesystem
1567 */
1568 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1569 bool excl)
1570 {
1571 struct afs_iget_data iget_data;
1572 struct afs_fs_cursor fc;
1573 struct afs_status_cb *scb;
1574 struct afs_vnode *dvnode = AFS_FS_I(dir);
1575 struct key *key;
1576 int ret;
1577
1578 mode |= S_IFREG;
1579
1580 _enter("{%llx:%llu},{%pd},%ho,",
1581 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1582
1583 ret = -ENAMETOOLONG;
1584 if (dentry->d_name.len >= AFSNAMEMAX)
1585 goto error;
1586
1587 key = afs_request_key(dvnode->volume->cell);
1588 if (IS_ERR(key)) {
1589 ret = PTR_ERR(key);
1590 goto error;
1591 }
1592
1593 ret = -ENOMEM;
1594 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1595 if (!scb)
1596 goto error_scb;
1597
1598 ret = -ERESTARTSYS;
1599 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1600 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1601
1602 while (afs_select_fileserver(&fc)) {
1603 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1604 afs_prep_for_new_inode(&fc, &iget_data);
1605 afs_fs_create(&fc, dentry->d_name.name, mode,
1606 &scb[0], &iget_data.fid, &scb[1]);
1607 }
1608
1609 afs_check_for_remote_deletion(&fc, dvnode);
1610 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1611 &data_version, &scb[0]);
1612 afs_update_dentry_version(&fc, dentry, &scb[0]);
1613 afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
1614 ret = afs_end_vnode_operation(&fc);
1615 if (ret < 0)
1616 goto error_key;
1617 } else {
1618 goto error_key;
1619 }
1620
1621 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1622 afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
1623 afs_edit_dir_for_create);
1624
1625 kfree(scb);
1626 key_put(key);
1627 _leave(" = 0");
1628 return 0;
1629
1630 error_scb:
1631 kfree(scb);
1632 error_key:
1633 key_put(key);
1634 error:
1635 d_drop(dentry);
1636 _leave(" = %d", ret);
1637 return ret;
1638 }
1639
1640 /*
1641 * create a hard link between files in an AFS filesystem
1642 */
1643 static int afs_link(struct dentry *from, struct inode *dir,
1644 struct dentry *dentry)
1645 {
1646 struct afs_fs_cursor fc;
1647 struct afs_status_cb *scb;
1648 struct afs_vnode *dvnode = AFS_FS_I(dir);
1649 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1650 struct key *key;
1651 int ret;
1652
1653 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1654 vnode->fid.vid, vnode->fid.vnode,
1655 dvnode->fid.vid, dvnode->fid.vnode,
1656 dentry);
1657
1658 ret = -ENAMETOOLONG;
1659 if (dentry->d_name.len >= AFSNAMEMAX)
1660 goto error;
1661
1662 ret = -ENOMEM;
1663 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1664 if (!scb)
1665 goto error;
1666
1667 key = afs_request_key(dvnode->volume->cell);
1668 if (IS_ERR(key)) {
1669 ret = PTR_ERR(key);
1670 goto error_scb;
1671 }
1672
1673 ret = -ERESTARTSYS;
1674 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1675 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1676
1677 if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
1678 afs_end_vnode_operation(&fc);
1679 goto error_key;
1680 }
1681
1682 while (afs_select_fileserver(&fc)) {
1683 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1684 fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
1685 afs_fs_link(&fc, vnode, dentry->d_name.name,
1686 &scb[0], &scb[1]);
1687 }
1688
1689 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1690 &data_version, &scb[0]);
1691 afs_vnode_commit_status(&fc, vnode, fc.cb_break_2,
1692 NULL, &scb[1]);
1693 ihold(&vnode->vfs_inode);
1694 afs_update_dentry_version(&fc, dentry, &scb[0]);
1695 d_instantiate(dentry, &vnode->vfs_inode);
1696
1697 mutex_unlock(&vnode->io_lock);
1698 ret = afs_end_vnode_operation(&fc);
1699 if (ret < 0)
1700 goto error_key;
1701 } else {
1702 goto error_key;
1703 }
1704
1705 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1706 afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid,
1707 afs_edit_dir_for_link);
1708
1709 key_put(key);
1710 kfree(scb);
1711 _leave(" = 0");
1712 return 0;
1713
1714 error_key:
1715 key_put(key);
1716 error_scb:
1717 kfree(scb);
1718 error:
1719 d_drop(dentry);
1720 _leave(" = %d", ret);
1721 return ret;
1722 }
1723
1724 /*
1725 * create a symlink in an AFS filesystem
1726 */
1727 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1728 const char *content)
1729 {
1730 struct afs_iget_data iget_data;
1731 struct afs_fs_cursor fc;
1732 struct afs_status_cb *scb;
1733 struct afs_vnode *dvnode = AFS_FS_I(dir);
1734 struct key *key;
1735 int ret;
1736
1737 _enter("{%llx:%llu},{%pd},%s",
1738 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1739 content);
1740
1741 ret = -ENAMETOOLONG;
1742 if (dentry->d_name.len >= AFSNAMEMAX)
1743 goto error;
1744
1745 ret = -EINVAL;
1746 if (strlen(content) >= AFSPATHMAX)
1747 goto error;
1748
1749 ret = -ENOMEM;
1750 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1751 if (!scb)
1752 goto error;
1753
1754 key = afs_request_key(dvnode->volume->cell);
1755 if (IS_ERR(key)) {
1756 ret = PTR_ERR(key);
1757 goto error_scb;
1758 }
1759
1760 ret = -ERESTARTSYS;
1761 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1762 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1763
1764 while (afs_select_fileserver(&fc)) {
1765 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1766 afs_prep_for_new_inode(&fc, &iget_data);
1767 afs_fs_symlink(&fc, dentry->d_name.name, content,
1768 &scb[0], &iget_data.fid, &scb[1]);
1769 }
1770
1771 afs_check_for_remote_deletion(&fc, dvnode);
1772 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1773 &data_version, &scb[0]);
1774 afs_update_dentry_version(&fc, dentry, &scb[0]);
1775 afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
1776 ret = afs_end_vnode_operation(&fc);
1777 if (ret < 0)
1778 goto error_key;
1779 } else {
1780 goto error_key;
1781 }
1782
1783 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1784 afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
1785 afs_edit_dir_for_symlink);
1786
1787 key_put(key);
1788 kfree(scb);
1789 _leave(" = 0");
1790 return 0;
1791
1792 error_key:
1793 key_put(key);
1794 error_scb:
1795 kfree(scb);
1796 error:
1797 d_drop(dentry);
1798 _leave(" = %d", ret);
1799 return ret;
1800 }
1801
1802 /*
1803 * rename a file in an AFS filesystem and/or move it between directories
1804 */
1805 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1806 struct inode *new_dir, struct dentry *new_dentry,
1807 unsigned int flags)
1808 {
1809 struct afs_fs_cursor fc;
1810 struct afs_status_cb *scb;
1811 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1812 struct dentry *tmp = NULL, *rehash = NULL;
1813 struct inode *new_inode;
1814 struct key *key;
1815 bool new_negative = d_is_negative(new_dentry);
1816 int ret;
1817
1818 if (flags)
1819 return -EINVAL;
1820
1821 /* Don't allow silly-rename files be moved around. */
1822 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1823 return -EINVAL;
1824
1825 vnode = AFS_FS_I(d_inode(old_dentry));
1826 orig_dvnode = AFS_FS_I(old_dir);
1827 new_dvnode = AFS_FS_I(new_dir);
1828
1829 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1830 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1831 vnode->fid.vid, vnode->fid.vnode,
1832 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1833 new_dentry);
1834
1835 ret = -ENOMEM;
1836 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1837 if (!scb)
1838 goto error;
1839
1840 key = afs_request_key(orig_dvnode->volume->cell);
1841 if (IS_ERR(key)) {
1842 ret = PTR_ERR(key);
1843 goto error_scb;
1844 }
1845
1846 /* For non-directories, check whether the target is busy and if so,
1847 * make a copy of the dentry and then do a silly-rename. If the
1848 * silly-rename succeeds, the copied dentry is hashed and becomes the
1849 * new target.
1850 */
1851 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
1852 /* To prevent any new references to the target during the
1853 * rename, we unhash the dentry in advance.
1854 */
1855 if (!d_unhashed(new_dentry)) {
1856 d_drop(new_dentry);
1857 rehash = new_dentry;
1858 }
1859
1860 if (d_count(new_dentry) > 2) {
1861 /* copy the target dentry's name */
1862 ret = -ENOMEM;
1863 tmp = d_alloc(new_dentry->d_parent,
1864 &new_dentry->d_name);
1865 if (!tmp)
1866 goto error_rehash;
1867
1868 ret = afs_sillyrename(new_dvnode,
1869 AFS_FS_I(d_inode(new_dentry)),
1870 new_dentry, key);
1871 if (ret)
1872 goto error_rehash;
1873
1874 new_dentry = tmp;
1875 rehash = NULL;
1876 new_negative = true;
1877 }
1878 }
1879
1880 /* This bit is potentially nasty as there's a potential race with
1881 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
1882 * to reflect it's new parent's new data_version after the op, but
1883 * d_revalidate may see old_dentry between the op having taken place
1884 * and the version being updated.
1885 *
1886 * So drop the old_dentry for now to make other threads go through
1887 * lookup instead - which we hold a lock against.
1888 */
1889 d_drop(old_dentry);
1890
1891 ret = -ERESTARTSYS;
1892 if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) {
1893 afs_dataversion_t orig_data_version;
1894 afs_dataversion_t new_data_version;
1895 struct afs_status_cb *new_scb = &scb[1];
1896
1897 orig_data_version = orig_dvnode->status.data_version + 1;
1898
1899 if (orig_dvnode != new_dvnode) {
1900 if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
1901 afs_end_vnode_operation(&fc);
1902 goto error_rehash_old;
1903 }
1904 new_data_version = new_dvnode->status.data_version + 1;
1905 } else {
1906 new_data_version = orig_data_version;
1907 new_scb = &scb[0];
1908 }
1909
1910 while (afs_select_fileserver(&fc)) {
1911 fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode);
1912 fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode);
1913 afs_fs_rename(&fc, old_dentry->d_name.name,
1914 new_dvnode, new_dentry->d_name.name,
1915 &scb[0], new_scb);
1916 }
1917
1918 afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break,
1919 &orig_data_version, &scb[0]);
1920 if (new_dvnode != orig_dvnode) {
1921 afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2,
1922 &new_data_version, &scb[1]);
1923 mutex_unlock(&new_dvnode->io_lock);
1924 }
1925 ret = afs_end_vnode_operation(&fc);
1926 if (ret < 0)
1927 goto error_rehash_old;
1928 }
1929
1930 if (ret == 0) {
1931 if (rehash)
1932 d_rehash(rehash);
1933 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags))
1934 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1935 afs_edit_dir_for_rename_0);
1936
1937 if (!new_negative &&
1938 test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
1939 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1940 afs_edit_dir_for_rename_1);
1941
1942 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
1943 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1944 &vnode->fid, afs_edit_dir_for_rename_2);
1945
1946 new_inode = d_inode(new_dentry);
1947 if (new_inode) {
1948 spin_lock(&new_inode->i_lock);
1949 if (new_inode->i_nlink > 0)
1950 drop_nlink(new_inode);
1951 spin_unlock(&new_inode->i_lock);
1952 }
1953
1954 /* Now we can update d_fsdata on the dentries to reflect their
1955 * new parent's data_version.
1956 *
1957 * Note that if we ever implement RENAME_EXCHANGE, we'll have
1958 * to update both dentries with opposing dir versions.
1959 */
1960 if (new_dvnode != orig_dvnode) {
1961 afs_update_dentry_version(&fc, old_dentry, &scb[1]);
1962 afs_update_dentry_version(&fc, new_dentry, &scb[1]);
1963 } else {
1964 afs_update_dentry_version(&fc, old_dentry, &scb[0]);
1965 afs_update_dentry_version(&fc, new_dentry, &scb[0]);
1966 }
1967 d_move(old_dentry, new_dentry);
1968 goto error_tmp;
1969 }
1970
1971 error_rehash_old:
1972 d_rehash(new_dentry);
1973 error_rehash:
1974 if (rehash)
1975 d_rehash(rehash);
1976 error_tmp:
1977 if (tmp)
1978 dput(tmp);
1979 key_put(key);
1980 error_scb:
1981 kfree(scb);
1982 error:
1983 _leave(" = %d", ret);
1984 return ret;
1985 }
1986
1987 /*
1988 * Release a directory page and clean up its private state if it's not busy
1989 * - return true if the page can now be released, false if not
1990 */
1991 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
1992 {
1993 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1994
1995 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
1996
1997 set_page_private(page, 0);
1998 ClearPagePrivate(page);
1999
2000 /* The directory will need reloading. */
2001 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2002 afs_stat_v(dvnode, n_relpg);
2003 return 1;
2004 }
2005
2006 /*
2007 * invalidate part or all of a page
2008 * - release a page and clean up its private data if offset is 0 (indicating
2009 * the entire page)
2010 */
2011 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
2012 unsigned int length)
2013 {
2014 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
2015
2016 _enter("{%lu},%u,%u", page->index, offset, length);
2017
2018 BUG_ON(!PageLocked(page));
2019
2020 /* The directory will need reloading. */
2021 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2022 afs_stat_v(dvnode, n_inval);
2023
2024 /* we clean up only if the entire page is being invalidated */
2025 if (offset == 0 && length == PAGE_SIZE) {
2026 set_page_private(page, 0);
2027 ClearPagePrivate(page);
2028 }
2029 }
Linux with added FPC-III support