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
afs_dir_set_page_dirty(struct page * page)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 };
73
74 const struct address_space_operations afs_dir_aops = {
75 .set_page_dirty = afs_dir_set_page_dirty,
76 .releasepage = afs_dir_releasepage,
77 .invalidatepage = afs_dir_invalidatepage,
78 };
79
80 const struct dentry_operations afs_fs_dentry_operations = {
81 .d_revalidate = afs_d_revalidate,
82 .d_delete = afs_d_delete,
83 .d_release = afs_d_release,
84 .d_automount = afs_d_automount,
85 .d_iput = afs_d_iput,
86 };
87
88 struct afs_lookup_one_cookie {
89 struct dir_context ctx;
90 struct qstr name;
91 bool found;
92 struct afs_fid fid;
93 };
94
95 struct afs_lookup_cookie {
96 struct dir_context ctx;
97 struct qstr name;
98 bool found;
99 bool one_only;
100 unsigned short nr_fids;
101 struct inode **inodes;
102 struct afs_status_cb *statuses;
103 struct afs_fid fids[50];
104 };
105
106 /*
107 * check that a directory page is valid
108 */
afs_dir_check_page(struct afs_vnode * dvnode,struct page * page,loff_t i_size)109 static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
110 loff_t i_size)
111 {
112 struct afs_xdr_dir_page *dbuf;
113 loff_t latter, off;
114 int tmp, qty;
115
116 /* Determine how many magic numbers there should be in this page, but
117 * we must take care because the directory may change size under us.
118 */
119 off = page_offset(page);
120 if (i_size <= off)
121 goto checked;
122
123 latter = i_size - off;
124 if (latter >= PAGE_SIZE)
125 qty = PAGE_SIZE;
126 else
127 qty = latter;
128 qty /= sizeof(union afs_xdr_dir_block);
129
130 /* check them */
131 dbuf = kmap(page);
132 for (tmp = 0; tmp < qty; tmp++) {
133 if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
134 printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
135 __func__, dvnode->vfs_inode.i_ino, tmp, qty,
136 ntohs(dbuf->blocks[tmp].hdr.magic));
137 trace_afs_dir_check_failed(dvnode, off, i_size);
138 kunmap(page);
139 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
140 goto error;
141 }
142
143 /* Make sure each block is NUL terminated so we can reasonably
144 * use string functions on it. The filenames in the page
145 * *should* be NUL-terminated anyway.
146 */
147 ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
148 }
149
150 kunmap(page);
151
152 checked:
153 afs_stat_v(dvnode, n_read_dir);
154 return true;
155
156 error:
157 return false;
158 }
159
160 /*
161 * Check the contents of a directory that we've just read.
162 */
afs_dir_check_pages(struct afs_vnode * dvnode,struct afs_read * req)163 static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
164 {
165 struct afs_xdr_dir_page *dbuf;
166 unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
167
168 for (i = 0; i < req->nr_pages; i++)
169 if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
170 goto bad;
171 return true;
172
173 bad:
174 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
175 dvnode->fid.vid, dvnode->fid.vnode,
176 req->file_size, req->len, req->actual_len, req->remain);
177 pr_warn("DIR %llx %x %x %x\n",
178 req->pos, req->index, req->nr_pages, req->offset);
179
180 for (i = 0; i < req->nr_pages; i++) {
181 dbuf = kmap(req->pages[i]);
182 for (j = 0; j < qty; j++) {
183 union afs_xdr_dir_block *block = &dbuf->blocks[j];
184
185 pr_warn("[%02x] %32phN\n", i * qty + j, block);
186 }
187 kunmap(req->pages[i]);
188 }
189 return false;
190 }
191
192 /*
193 * open an AFS directory file
194 */
afs_dir_open(struct inode * inode,struct file * file)195 static int afs_dir_open(struct inode *inode, struct file *file)
196 {
197 _enter("{%lu}", inode->i_ino);
198
199 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
200 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
201
202 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
203 return -ENOENT;
204
205 return afs_open(inode, file);
206 }
207
208 /*
209 * Read the directory into the pagecache in one go, scrubbing the previous
210 * contents. The list of pages is returned, pinning them so that they don't
211 * get reclaimed during the iteration.
212 */
afs_read_dir(struct afs_vnode * dvnode,struct key * key)213 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
214 __acquires(&dvnode->validate_lock)
215 {
216 struct afs_read *req;
217 loff_t i_size;
218 int nr_pages, nr_inline, i, n;
219 int ret = -ENOMEM;
220
221 retry:
222 i_size = i_size_read(&dvnode->vfs_inode);
223 if (i_size < 2048)
224 return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small));
225 if (i_size > 2048 * 1024) {
226 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
227 return ERR_PTR(-EFBIG);
228 }
229
230 _enter("%llu", i_size);
231
232 /* Get a request record to hold the page list. We want to hold it
233 * inline if we can, but we don't want to make an order 1 allocation.
234 */
235 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
236 nr_inline = nr_pages;
237 if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
238 nr_inline = 0;
239
240 req = kzalloc(struct_size(req, array, nr_inline), GFP_KERNEL);
241 if (!req)
242 return ERR_PTR(-ENOMEM);
243
244 refcount_set(&req->usage, 1);
245 req->nr_pages = nr_pages;
246 req->actual_len = i_size; /* May change */
247 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
248 req->data_version = dvnode->status.data_version; /* May change */
249 if (nr_inline > 0) {
250 req->pages = req->array;
251 } else {
252 req->pages = kcalloc(nr_pages, sizeof(struct page *),
253 GFP_KERNEL);
254 if (!req->pages)
255 goto error;
256 }
257
258 /* Get a list of all the pages that hold or will hold the directory
259 * content. We need to fill in any gaps that we might find where the
260 * memory reclaimer has been at work. If there are any gaps, we will
261 * need to reread the entire directory contents.
262 */
263 i = 0;
264 do {
265 n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
266 req->nr_pages - i,
267 req->pages + i);
268 _debug("find %u at %u/%u", n, i, req->nr_pages);
269 if (n == 0) {
270 gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;
271
272 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
273 afs_stat_v(dvnode, n_inval);
274
275 ret = -ENOMEM;
276 req->pages[i] = __page_cache_alloc(gfp);
277 if (!req->pages[i])
278 goto error;
279 ret = add_to_page_cache_lru(req->pages[i],
280 dvnode->vfs_inode.i_mapping,
281 i, gfp);
282 if (ret < 0)
283 goto error;
284
285 set_page_private(req->pages[i], 1);
286 SetPagePrivate(req->pages[i]);
287 unlock_page(req->pages[i]);
288 i++;
289 } else {
290 i += n;
291 }
292 } while (i < req->nr_pages);
293
294 /* If we're going to reload, we need to lock all the pages to prevent
295 * races.
296 */
297 ret = -ERESTARTSYS;
298 if (down_read_killable(&dvnode->validate_lock) < 0)
299 goto error;
300
301 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
302 goto success;
303
304 up_read(&dvnode->validate_lock);
305 if (down_write_killable(&dvnode->validate_lock) < 0)
306 goto error;
307
308 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
309 trace_afs_reload_dir(dvnode);
310 ret = afs_fetch_data(dvnode, key, req);
311 if (ret < 0)
312 goto error_unlock;
313
314 task_io_account_read(PAGE_SIZE * req->nr_pages);
315
316 if (req->len < req->file_size)
317 goto content_has_grown;
318
319 /* Validate the data we just read. */
320 ret = -EIO;
321 if (!afs_dir_check_pages(dvnode, req))
322 goto error_unlock;
323
324 // TODO: Trim excess pages
325
326 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
327 }
328
329 downgrade_write(&dvnode->validate_lock);
330 success:
331 return req;
332
333 error_unlock:
334 up_write(&dvnode->validate_lock);
335 error:
336 afs_put_read(req);
337 _leave(" = %d", ret);
338 return ERR_PTR(ret);
339
340 content_has_grown:
341 up_write(&dvnode->validate_lock);
342 afs_put_read(req);
343 goto retry;
344 }
345
346 /*
347 * deal with one block in an AFS directory
348 */
afs_dir_iterate_block(struct afs_vnode * dvnode,struct dir_context * ctx,union afs_xdr_dir_block * block,unsigned blkoff)349 static int afs_dir_iterate_block(struct afs_vnode *dvnode,
350 struct dir_context *ctx,
351 union afs_xdr_dir_block *block,
352 unsigned blkoff)
353 {
354 union afs_xdr_dirent *dire;
355 unsigned offset, next, curr;
356 size_t nlen;
357 int tmp;
358
359 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
360
361 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
362
363 /* walk through the block, an entry at a time */
364 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
365 offset < AFS_DIR_SLOTS_PER_BLOCK;
366 offset = next
367 ) {
368 next = offset + 1;
369
370 /* skip entries marked unused in the bitmap */
371 if (!(block->hdr.bitmap[offset / 8] &
372 (1 << (offset % 8)))) {
373 _debug("ENT[%zu.%u]: unused",
374 blkoff / sizeof(union afs_xdr_dir_block), offset);
375 if (offset >= curr)
376 ctx->pos = blkoff +
377 next * sizeof(union afs_xdr_dirent);
378 continue;
379 }
380
381 /* got a valid entry */
382 dire = &block->dirents[offset];
383 nlen = strnlen(dire->u.name,
384 sizeof(*block) -
385 offset * sizeof(union afs_xdr_dirent));
386
387 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
388 blkoff / sizeof(union afs_xdr_dir_block), offset,
389 (offset < curr ? "skip" : "fill"),
390 nlen, dire->u.name);
391
392 /* work out where the next possible entry is */
393 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) {
394 if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
395 _debug("ENT[%zu.%u]:"
396 " %u travelled beyond end dir block"
397 " (len %u/%zu)",
398 blkoff / sizeof(union afs_xdr_dir_block),
399 offset, next, tmp, nlen);
400 return afs_bad(dvnode, afs_file_error_dir_over_end);
401 }
402 if (!(block->hdr.bitmap[next / 8] &
403 (1 << (next % 8)))) {
404 _debug("ENT[%zu.%u]:"
405 " %u unmarked extension (len %u/%zu)",
406 blkoff / sizeof(union afs_xdr_dir_block),
407 offset, next, tmp, nlen);
408 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
409 }
410
411 _debug("ENT[%zu.%u]: ext %u/%zu",
412 blkoff / sizeof(union afs_xdr_dir_block),
413 next, tmp, nlen);
414 next++;
415 }
416
417 /* skip if starts before the current position */
418 if (offset < curr) {
419 if (next > curr)
420 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
421 continue;
422 }
423
424 /* found the next entry */
425 if (!dir_emit(ctx, dire->u.name, nlen,
426 ntohl(dire->u.vnode),
427 (ctx->actor == afs_lookup_filldir ||
428 ctx->actor == afs_lookup_one_filldir)?
429 ntohl(dire->u.unique) : DT_UNKNOWN)) {
430 _leave(" = 0 [full]");
431 return 0;
432 }
433
434 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
435 }
436
437 _leave(" = 1 [more]");
438 return 1;
439 }
440
441 /*
442 * iterate through the data blob that lists the contents of an AFS directory
443 */
afs_dir_iterate(struct inode * dir,struct dir_context * ctx,struct key * key,afs_dataversion_t * _dir_version)444 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
445 struct key *key, afs_dataversion_t *_dir_version)
446 {
447 struct afs_vnode *dvnode = AFS_FS_I(dir);
448 struct afs_xdr_dir_page *dbuf;
449 union afs_xdr_dir_block *dblock;
450 struct afs_read *req;
451 struct page *page;
452 unsigned blkoff, limit;
453 int ret;
454
455 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
456
457 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
458 _leave(" = -ESTALE");
459 return -ESTALE;
460 }
461
462 req = afs_read_dir(dvnode, key);
463 if (IS_ERR(req))
464 return PTR_ERR(req);
465 *_dir_version = req->data_version;
466
467 /* round the file position up to the next entry boundary */
468 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
469 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
470
471 /* walk through the blocks in sequence */
472 ret = 0;
473 while (ctx->pos < req->actual_len) {
474 blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
475
476 /* Fetch the appropriate page from the directory and re-add it
477 * to the LRU.
478 */
479 page = req->pages[blkoff / PAGE_SIZE];
480 if (!page) {
481 ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
482 break;
483 }
484 mark_page_accessed(page);
485
486 limit = blkoff & ~(PAGE_SIZE - 1);
487
488 dbuf = kmap(page);
489
490 /* deal with the individual blocks stashed on this page */
491 do {
492 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
493 sizeof(union afs_xdr_dir_block)];
494 ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff);
495 if (ret != 1) {
496 kunmap(page);
497 goto out;
498 }
499
500 blkoff += sizeof(union afs_xdr_dir_block);
501
502 } while (ctx->pos < dir->i_size && blkoff < limit);
503
504 kunmap(page);
505 ret = 0;
506 }
507
508 out:
509 up_read(&dvnode->validate_lock);
510 afs_put_read(req);
511 _leave(" = %d", ret);
512 return ret;
513 }
514
515 /*
516 * read an AFS directory
517 */
afs_readdir(struct file * file,struct dir_context * ctx)518 static int afs_readdir(struct file *file, struct dir_context *ctx)
519 {
520 afs_dataversion_t dir_version;
521
522 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
523 &dir_version);
524 }
525
526 /*
527 * Search the directory for a single name
528 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
529 * uniquifier through dtype
530 */
afs_lookup_one_filldir(struct dir_context * ctx,const char * name,int nlen,loff_t fpos,u64 ino,unsigned dtype)531 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
532 int nlen, loff_t fpos, u64 ino, unsigned dtype)
533 {
534 struct afs_lookup_one_cookie *cookie =
535 container_of(ctx, struct afs_lookup_one_cookie, ctx);
536
537 _enter("{%s,%u},%s,%u,,%llu,%u",
538 cookie->name.name, cookie->name.len, name, nlen,
539 (unsigned long long) ino, dtype);
540
541 /* insanity checks first */
542 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
543 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
544
545 if (cookie->name.len != nlen ||
546 memcmp(cookie->name.name, name, nlen) != 0) {
547 _leave(" = 0 [no]");
548 return 0;
549 }
550
551 cookie->fid.vnode = ino;
552 cookie->fid.unique = dtype;
553 cookie->found = 1;
554
555 _leave(" = -1 [found]");
556 return -1;
557 }
558
559 /*
560 * Do a lookup of a single name in a directory
561 * - just returns the FID the dentry name maps to if found
562 */
afs_do_lookup_one(struct inode * dir,struct dentry * dentry,struct afs_fid * fid,struct key * key,afs_dataversion_t * _dir_version)563 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
564 struct afs_fid *fid, struct key *key,
565 afs_dataversion_t *_dir_version)
566 {
567 struct afs_super_info *as = dir->i_sb->s_fs_info;
568 struct afs_lookup_one_cookie cookie = {
569 .ctx.actor = afs_lookup_one_filldir,
570 .name = dentry->d_name,
571 .fid.vid = as->volume->vid
572 };
573 int ret;
574
575 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
576
577 /* search the directory */
578 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
579 if (ret < 0) {
580 _leave(" = %d [iter]", ret);
581 return ret;
582 }
583
584 ret = -ENOENT;
585 if (!cookie.found) {
586 _leave(" = -ENOENT [not found]");
587 return -ENOENT;
588 }
589
590 *fid = cookie.fid;
591 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
592 return 0;
593 }
594
595 /*
596 * search the directory for a name
597 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
598 * uniquifier through dtype
599 */
afs_lookup_filldir(struct dir_context * ctx,const char * name,int nlen,loff_t fpos,u64 ino,unsigned dtype)600 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
601 int nlen, loff_t fpos, u64 ino, unsigned dtype)
602 {
603 struct afs_lookup_cookie *cookie =
604 container_of(ctx, struct afs_lookup_cookie, ctx);
605 int ret;
606
607 _enter("{%s,%u},%s,%u,,%llu,%u",
608 cookie->name.name, cookie->name.len, name, nlen,
609 (unsigned long long) ino, dtype);
610
611 /* insanity checks first */
612 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
613 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
614
615 if (cookie->found) {
616 if (cookie->nr_fids < 50) {
617 cookie->fids[cookie->nr_fids].vnode = ino;
618 cookie->fids[cookie->nr_fids].unique = dtype;
619 cookie->nr_fids++;
620 }
621 } else if (cookie->name.len == nlen &&
622 memcmp(cookie->name.name, name, nlen) == 0) {
623 cookie->fids[0].vnode = ino;
624 cookie->fids[0].unique = dtype;
625 cookie->found = 1;
626 if (cookie->one_only)
627 return -1;
628 }
629
630 ret = cookie->nr_fids >= 50 ? -1 : 0;
631 _leave(" = %d", ret);
632 return ret;
633 }
634
635 /*
636 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
637 * files in one go and create inodes for them. The inode of the file we were
638 * asked for is returned.
639 */
afs_do_lookup(struct inode * dir,struct dentry * dentry,struct key * key)640 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
641 struct key *key)
642 {
643 struct afs_lookup_cookie *cookie;
644 struct afs_cb_interest *dcbi, *cbi = NULL;
645 struct afs_super_info *as = dir->i_sb->s_fs_info;
646 struct afs_status_cb *scb;
647 struct afs_iget_data iget_data;
648 struct afs_fs_cursor fc;
649 struct afs_server *server;
650 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
651 struct inode *inode = NULL, *ti;
652 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
653 int ret, i;
654
655 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
656
657 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
658 if (!cookie)
659 return ERR_PTR(-ENOMEM);
660
661 cookie->ctx.actor = afs_lookup_filldir;
662 cookie->name = dentry->d_name;
663 cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want
664 * and slot 1 for the directory */
665
666 read_seqlock_excl(&dvnode->cb_lock);
667 dcbi = rcu_dereference_protected(dvnode->cb_interest,
668 lockdep_is_held(&dvnode->cb_lock.lock));
669 if (dcbi) {
670 server = dcbi->server;
671 if (server &&
672 test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
673 cookie->one_only = true;
674 }
675 read_sequnlock_excl(&dvnode->cb_lock);
676
677 for (i = 0; i < 50; i++)
678 cookie->fids[i].vid = as->volume->vid;
679
680 /* search the directory */
681 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
682 if (ret < 0) {
683 inode = ERR_PTR(ret);
684 goto out;
685 }
686
687 dentry->d_fsdata = (void *)(unsigned long)data_version;
688
689 inode = ERR_PTR(-ENOENT);
690 if (!cookie->found)
691 goto out;
692
693 /* Check to see if we already have an inode for the primary fid. */
694 iget_data.fid = cookie->fids[0];
695 iget_data.volume = dvnode->volume;
696 iget_data.cb_v_break = dvnode->volume->cb_v_break;
697 iget_data.cb_s_break = 0;
698 inode = ilookup5(dir->i_sb, cookie->fids[0].vnode,
699 afs_iget5_test, &iget_data);
700 if (inode)
701 goto out;
702
703 /* Need space for examining all the selected files */
704 inode = ERR_PTR(-ENOMEM);
705 cookie->statuses = kvcalloc(cookie->nr_fids, sizeof(struct afs_status_cb),
706 GFP_KERNEL);
707 if (!cookie->statuses)
708 goto out;
709
710 cookie->inodes = kcalloc(cookie->nr_fids, sizeof(struct inode *),
711 GFP_KERNEL);
712 if (!cookie->inodes)
713 goto out_s;
714
715 cookie->fids[1] = dvnode->fid;
716 cookie->statuses[1].cb_break = afs_calc_vnode_cb_break(dvnode);
717 cookie->inodes[1] = igrab(&dvnode->vfs_inode);
718
719 for (i = 2; i < cookie->nr_fids; i++) {
720 scb = &cookie->statuses[i];
721
722 /* Find any inodes that already exist and get their
723 * callback counters.
724 */
725 iget_data.fid = cookie->fids[i];
726 ti = ilookup5_nowait(dir->i_sb, iget_data.fid.vnode,
727 afs_iget5_test, &iget_data);
728 if (!IS_ERR_OR_NULL(ti)) {
729 vnode = AFS_FS_I(ti);
730 scb->cb_break = afs_calc_vnode_cb_break(vnode);
731 cookie->inodes[i] = ti;
732 }
733 }
734
735 /* Try FS.InlineBulkStatus first. Abort codes for the individual
736 * lookups contained therein are stored in the reply without aborting
737 * the whole operation.
738 */
739 if (cookie->one_only)
740 goto no_inline_bulk_status;
741
742 inode = ERR_PTR(-ERESTARTSYS);
743 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
744 while (afs_select_fileserver(&fc)) {
745 if (test_bit(AFS_SERVER_FL_NO_IBULK,
746 &fc.cbi->server->flags)) {
747 fc.ac.abort_code = RX_INVALID_OPERATION;
748 fc.ac.error = -ECONNABORTED;
749 break;
750 }
751 iget_data.cb_v_break = dvnode->volume->cb_v_break;
752 iget_data.cb_s_break = fc.cbi->server->cb_s_break;
753 afs_fs_inline_bulk_status(&fc,
754 afs_v2net(dvnode),
755 cookie->fids,
756 cookie->statuses,
757 cookie->nr_fids, NULL);
758 }
759
760 if (fc.ac.error == 0)
761 cbi = afs_get_cb_interest(fc.cbi);
762 if (fc.ac.abort_code == RX_INVALID_OPERATION)
763 set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags);
764 inode = ERR_PTR(afs_end_vnode_operation(&fc));
765 }
766
767 if (!IS_ERR(inode))
768 goto success;
769 if (fc.ac.abort_code != RX_INVALID_OPERATION)
770 goto out_c;
771
772 no_inline_bulk_status:
773 /* We could try FS.BulkStatus next, but this aborts the entire op if
774 * any of the lookups fails - so, for the moment, revert to
775 * FS.FetchStatus for just the primary fid.
776 */
777 inode = ERR_PTR(-ERESTARTSYS);
778 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
779 while (afs_select_fileserver(&fc)) {
780 iget_data.cb_v_break = dvnode->volume->cb_v_break;
781 iget_data.cb_s_break = fc.cbi->server->cb_s_break;
782 scb = &cookie->statuses[0];
783 afs_fs_fetch_status(&fc,
784 afs_v2net(dvnode),
785 cookie->fids,
786 scb,
787 NULL);
788 }
789
790 if (fc.ac.error == 0)
791 cbi = afs_get_cb_interest(fc.cbi);
792 inode = ERR_PTR(afs_end_vnode_operation(&fc));
793 }
794
795 if (IS_ERR(inode))
796 goto out_c;
797
798 success:
799 /* Turn all the files into inodes and save the first one - which is the
800 * one we actually want.
801 */
802 scb = &cookie->statuses[0];
803 if (scb->status.abort_code != 0)
804 inode = ERR_PTR(afs_abort_to_error(scb->status.abort_code));
805
806 for (i = 0; i < cookie->nr_fids; i++) {
807 struct afs_status_cb *scb = &cookie->statuses[i];
808
809 if (!scb->have_status && !scb->have_error)
810 continue;
811
812 if (cookie->inodes[i]) {
813 struct afs_vnode *iv = AFS_FS_I(cookie->inodes[i]);
814
815 if (test_bit(AFS_VNODE_UNSET, &iv->flags))
816 continue;
817
818 afs_vnode_commit_status(&fc, iv,
819 scb->cb_break, NULL, scb);
820 continue;
821 }
822
823 if (scb->status.abort_code != 0)
824 continue;
825
826 iget_data.fid = cookie->fids[i];
827 ti = afs_iget(dir->i_sb, key, &iget_data, scb, cbi, dvnode);
828 if (!IS_ERR(ti))
829 afs_cache_permit(AFS_FS_I(ti), key,
830 0 /* Assume vnode->cb_break is 0 */ +
831 iget_data.cb_v_break,
832 scb);
833 if (i == 0) {
834 inode = ti;
835 } else {
836 if (!IS_ERR(ti))
837 iput(ti);
838 }
839 }
840
841 out_c:
842 afs_put_cb_interest(afs_v2net(dvnode), cbi);
843 if (cookie->inodes) {
844 for (i = 0; i < cookie->nr_fids; i++)
845 iput(cookie->inodes[i]);
846 kfree(cookie->inodes);
847 }
848 out_s:
849 kvfree(cookie->statuses);
850 out:
851 kfree(cookie);
852 return inode;
853 }
854
855 /*
856 * Look up an entry in a directory with @sys substitution.
857 */
afs_lookup_atsys(struct inode * dir,struct dentry * dentry,struct key * key)858 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
859 struct key *key)
860 {
861 struct afs_sysnames *subs;
862 struct afs_net *net = afs_i2net(dir);
863 struct dentry *ret;
864 char *buf, *p, *name;
865 int len, i;
866
867 _enter("");
868
869 ret = ERR_PTR(-ENOMEM);
870 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
871 if (!buf)
872 goto out_p;
873 if (dentry->d_name.len > 4) {
874 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
875 p += dentry->d_name.len - 4;
876 }
877
878 /* There is an ordered list of substitutes that we have to try. */
879 read_lock(&net->sysnames_lock);
880 subs = net->sysnames;
881 refcount_inc(&subs->usage);
882 read_unlock(&net->sysnames_lock);
883
884 for (i = 0; i < subs->nr; i++) {
885 name = subs->subs[i];
886 len = dentry->d_name.len - 4 + strlen(name);
887 if (len >= AFSNAMEMAX) {
888 ret = ERR_PTR(-ENAMETOOLONG);
889 goto out_s;
890 }
891
892 strcpy(p, name);
893 ret = lookup_one_len(buf, dentry->d_parent, len);
894 if (IS_ERR(ret) || d_is_positive(ret))
895 goto out_s;
896 dput(ret);
897 }
898
899 /* We don't want to d_add() the @sys dentry here as we don't want to
900 * the cached dentry to hide changes to the sysnames list.
901 */
902 ret = NULL;
903 out_s:
904 afs_put_sysnames(subs);
905 kfree(buf);
906 out_p:
907 key_put(key);
908 return ret;
909 }
910
911 /*
912 * look up an entry in a directory
913 */
afs_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)914 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
915 unsigned int flags)
916 {
917 struct afs_vnode *dvnode = AFS_FS_I(dir);
918 struct afs_fid fid = {};
919 struct inode *inode;
920 struct dentry *d;
921 struct key *key;
922 int ret;
923
924 _enter("{%llx:%llu},%p{%pd},",
925 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
926
927 ASSERTCMP(d_inode(dentry), ==, NULL);
928
929 if (dentry->d_name.len >= AFSNAMEMAX) {
930 _leave(" = -ENAMETOOLONG");
931 return ERR_PTR(-ENAMETOOLONG);
932 }
933
934 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
935 _leave(" = -ESTALE");
936 return ERR_PTR(-ESTALE);
937 }
938
939 key = afs_request_key(dvnode->volume->cell);
940 if (IS_ERR(key)) {
941 _leave(" = %ld [key]", PTR_ERR(key));
942 return ERR_CAST(key);
943 }
944
945 ret = afs_validate(dvnode, key);
946 if (ret < 0) {
947 key_put(key);
948 _leave(" = %d [val]", ret);
949 return ERR_PTR(ret);
950 }
951
952 if (dentry->d_name.len >= 4 &&
953 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
954 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
955 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
956 dentry->d_name.name[dentry->d_name.len - 1] == 's')
957 return afs_lookup_atsys(dir, dentry, key);
958
959 afs_stat_v(dvnode, n_lookup);
960 inode = afs_do_lookup(dir, dentry, key);
961 key_put(key);
962 if (inode == ERR_PTR(-ENOENT))
963 inode = afs_try_auto_mntpt(dentry, dir);
964
965 if (!IS_ERR_OR_NULL(inode))
966 fid = AFS_FS_I(inode)->fid;
967
968 d = d_splice_alias(inode, dentry);
969 if (!IS_ERR_OR_NULL(d)) {
970 d->d_fsdata = dentry->d_fsdata;
971 trace_afs_lookup(dvnode, &d->d_name, &fid);
972 } else {
973 trace_afs_lookup(dvnode, &dentry->d_name, &fid);
974 }
975 return d;
976 }
977
978 /*
979 * Check the validity of a dentry under RCU conditions.
980 */
afs_d_revalidate_rcu(struct dentry * dentry)981 static int afs_d_revalidate_rcu(struct dentry *dentry)
982 {
983 struct afs_vnode *dvnode;
984 struct dentry *parent;
985 struct inode *dir;
986 long dir_version, de_version;
987
988 _enter("%p", dentry);
989
990 /* Check the parent directory is still valid first. */
991 parent = READ_ONCE(dentry->d_parent);
992 dir = d_inode_rcu(parent);
993 if (!dir)
994 return -ECHILD;
995 dvnode = AFS_FS_I(dir);
996 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
997 return -ECHILD;
998
999 if (!afs_check_validity(dvnode))
1000 return -ECHILD;
1001
1002 /* We only need to invalidate a dentry if the server's copy changed
1003 * behind our back. If we made the change, it's no problem. Note that
1004 * on a 32-bit system, we only have 32 bits in the dentry to store the
1005 * version.
1006 */
1007 dir_version = (long)READ_ONCE(dvnode->status.data_version);
1008 de_version = (long)READ_ONCE(dentry->d_fsdata);
1009 if (de_version != dir_version) {
1010 dir_version = (long)READ_ONCE(dvnode->invalid_before);
1011 if (de_version - dir_version < 0)
1012 return -ECHILD;
1013 }
1014
1015 return 1; /* Still valid */
1016 }
1017
1018 /*
1019 * check that a dentry lookup hit has found a valid entry
1020 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
1021 * inode
1022 */
afs_d_revalidate(struct dentry * dentry,unsigned int flags)1023 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
1024 {
1025 struct afs_vnode *vnode, *dir;
1026 struct afs_fid fid;
1027 struct dentry *parent;
1028 struct inode *inode;
1029 struct key *key;
1030 afs_dataversion_t dir_version, invalid_before;
1031 long de_version;
1032 int ret;
1033
1034 if (flags & LOOKUP_RCU)
1035 return afs_d_revalidate_rcu(dentry);
1036
1037 if (d_really_is_positive(dentry)) {
1038 vnode = AFS_FS_I(d_inode(dentry));
1039 _enter("{v={%llx:%llu} n=%pd fl=%lx},",
1040 vnode->fid.vid, vnode->fid.vnode, dentry,
1041 vnode->flags);
1042 } else {
1043 _enter("{neg n=%pd}", dentry);
1044 }
1045
1046 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
1047 if (IS_ERR(key))
1048 key = NULL;
1049
1050 /* Hold the parent dentry so we can peer at it */
1051 parent = dget_parent(dentry);
1052 dir = AFS_FS_I(d_inode(parent));
1053
1054 /* validate the parent directory */
1055 afs_validate(dir, key);
1056
1057 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
1058 _debug("%pd: parent dir deleted", dentry);
1059 goto not_found;
1060 }
1061
1062 /* We only need to invalidate a dentry if the server's copy changed
1063 * behind our back. If we made the change, it's no problem. Note that
1064 * on a 32-bit system, we only have 32 bits in the dentry to store the
1065 * version.
1066 */
1067 dir_version = dir->status.data_version;
1068 de_version = (long)dentry->d_fsdata;
1069 if (de_version == (long)dir_version)
1070 goto out_valid_noupdate;
1071
1072 invalid_before = dir->invalid_before;
1073 if (de_version - (long)invalid_before >= 0)
1074 goto out_valid;
1075
1076 _debug("dir modified");
1077 afs_stat_v(dir, n_reval);
1078
1079 /* search the directory for this vnode */
1080 ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version);
1081 switch (ret) {
1082 case 0:
1083 /* the filename maps to something */
1084 if (d_really_is_negative(dentry))
1085 goto not_found;
1086 inode = d_inode(dentry);
1087 if (is_bad_inode(inode)) {
1088 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
1089 dentry);
1090 goto not_found;
1091 }
1092
1093 vnode = AFS_FS_I(inode);
1094
1095 /* if the vnode ID has changed, then the dirent points to a
1096 * different file */
1097 if (fid.vnode != vnode->fid.vnode) {
1098 _debug("%pd: dirent changed [%llu != %llu]",
1099 dentry, fid.vnode,
1100 vnode->fid.vnode);
1101 goto not_found;
1102 }
1103
1104 /* if the vnode ID uniqifier has changed, then the file has
1105 * been deleted and replaced, and the original vnode ID has
1106 * been reused */
1107 if (fid.unique != vnode->fid.unique) {
1108 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1109 dentry, fid.unique,
1110 vnode->fid.unique,
1111 vnode->vfs_inode.i_generation);
1112 goto not_found;
1113 }
1114 goto out_valid;
1115
1116 case -ENOENT:
1117 /* the filename is unknown */
1118 _debug("%pd: dirent not found", dentry);
1119 if (d_really_is_positive(dentry))
1120 goto not_found;
1121 goto out_valid;
1122
1123 default:
1124 _debug("failed to iterate dir %pd: %d",
1125 parent, ret);
1126 goto not_found;
1127 }
1128
1129 out_valid:
1130 dentry->d_fsdata = (void *)(unsigned long)dir_version;
1131 out_valid_noupdate:
1132 dput(parent);
1133 key_put(key);
1134 _leave(" = 1 [valid]");
1135 return 1;
1136
1137 not_found:
1138 _debug("dropping dentry %pd2", dentry);
1139 dput(parent);
1140 key_put(key);
1141
1142 _leave(" = 0 [bad]");
1143 return 0;
1144 }
1145
1146 /*
1147 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1148 * sleep)
1149 * - called from dput() when d_count is going to 0.
1150 * - return 1 to request dentry be unhashed, 0 otherwise
1151 */
afs_d_delete(const struct dentry * dentry)1152 static int afs_d_delete(const struct dentry *dentry)
1153 {
1154 _enter("%pd", dentry);
1155
1156 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1157 goto zap;
1158
1159 if (d_really_is_positive(dentry) &&
1160 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1161 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1162 goto zap;
1163
1164 _leave(" = 0 [keep]");
1165 return 0;
1166
1167 zap:
1168 _leave(" = 1 [zap]");
1169 return 1;
1170 }
1171
1172 /*
1173 * Clean up sillyrename files on dentry removal.
1174 */
afs_d_iput(struct dentry * dentry,struct inode * inode)1175 static void afs_d_iput(struct dentry *dentry, struct inode *inode)
1176 {
1177 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1178 afs_silly_iput(dentry, inode);
1179 iput(inode);
1180 }
1181
1182 /*
1183 * handle dentry release
1184 */
afs_d_release(struct dentry * dentry)1185 void afs_d_release(struct dentry *dentry)
1186 {
1187 _enter("%pd", dentry);
1188 }
1189
1190 /*
1191 * Create a new inode for create/mkdir/symlink
1192 */
afs_vnode_new_inode(struct afs_fs_cursor * fc,struct dentry * new_dentry,struct afs_iget_data * new_data,struct afs_status_cb * new_scb)1193 static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
1194 struct dentry *new_dentry,
1195 struct afs_iget_data *new_data,
1196 struct afs_status_cb *new_scb)
1197 {
1198 struct afs_vnode *vnode;
1199 struct inode *inode;
1200
1201 if (fc->ac.error < 0)
1202 return;
1203
1204 inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
1205 new_data, new_scb, fc->cbi, fc->vnode);
1206 if (IS_ERR(inode)) {
1207 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1208 * the new directory on the server.
1209 */
1210 fc->ac.error = PTR_ERR(inode);
1211 return;
1212 }
1213
1214 vnode = AFS_FS_I(inode);
1215 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1216 if (fc->ac.error == 0)
1217 afs_cache_permit(vnode, fc->key, vnode->cb_break, new_scb);
1218 d_instantiate(new_dentry, inode);
1219 }
1220
afs_prep_for_new_inode(struct afs_fs_cursor * fc,struct afs_iget_data * iget_data)1221 static void afs_prep_for_new_inode(struct afs_fs_cursor *fc,
1222 struct afs_iget_data *iget_data)
1223 {
1224 iget_data->volume = fc->vnode->volume;
1225 iget_data->cb_v_break = fc->vnode->volume->cb_v_break;
1226 iget_data->cb_s_break = fc->cbi->server->cb_s_break;
1227 }
1228
1229 /*
1230 * Note that a dentry got changed. We need to set d_fsdata to the data version
1231 * number derived from the result of the operation. It doesn't matter if
1232 * d_fsdata goes backwards as we'll just revalidate.
1233 */
afs_update_dentry_version(struct afs_fs_cursor * fc,struct dentry * dentry,struct afs_status_cb * scb)1234 static void afs_update_dentry_version(struct afs_fs_cursor *fc,
1235 struct dentry *dentry,
1236 struct afs_status_cb *scb)
1237 {
1238 if (fc->ac.error == 0)
1239 dentry->d_fsdata =
1240 (void *)(unsigned long)scb->status.data_version;
1241 }
1242
1243 /*
1244 * create a directory on an AFS filesystem
1245 */
afs_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)1246 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1247 {
1248 struct afs_iget_data iget_data;
1249 struct afs_status_cb *scb;
1250 struct afs_fs_cursor fc;
1251 struct afs_vnode *dvnode = AFS_FS_I(dir);
1252 struct key *key;
1253 afs_dataversion_t data_version;
1254 int ret;
1255
1256 mode |= S_IFDIR;
1257
1258 _enter("{%llx:%llu},{%pd},%ho",
1259 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1260
1261 ret = -ENOMEM;
1262 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1263 if (!scb)
1264 goto error;
1265
1266 key = afs_request_key(dvnode->volume->cell);
1267 if (IS_ERR(key)) {
1268 ret = PTR_ERR(key);
1269 goto error_scb;
1270 }
1271
1272 ret = -ERESTARTSYS;
1273 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1274 data_version = dvnode->status.data_version + 1;
1275
1276 while (afs_select_fileserver(&fc)) {
1277 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1278 afs_prep_for_new_inode(&fc, &iget_data);
1279 afs_fs_create(&fc, dentry->d_name.name, mode,
1280 &scb[0], &iget_data.fid, &scb[1]);
1281 }
1282
1283 afs_check_for_remote_deletion(&fc, dvnode);
1284 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1285 &data_version, &scb[0]);
1286 afs_update_dentry_version(&fc, dentry, &scb[0]);
1287 afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
1288 ret = afs_end_vnode_operation(&fc);
1289 if (ret < 0)
1290 goto error_key;
1291 } else {
1292 goto error_key;
1293 }
1294
1295 if (ret == 0) {
1296 down_write(&dvnode->validate_lock);
1297 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1298 dvnode->status.data_version == data_version)
1299 afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
1300 afs_edit_dir_for_create);
1301 up_write(&dvnode->validate_lock);
1302 }
1303
1304 key_put(key);
1305 kfree(scb);
1306 _leave(" = 0");
1307 return 0;
1308
1309 error_key:
1310 key_put(key);
1311 error_scb:
1312 kfree(scb);
1313 error:
1314 d_drop(dentry);
1315 _leave(" = %d", ret);
1316 return ret;
1317 }
1318
1319 /*
1320 * Remove a subdir from a directory.
1321 */
afs_dir_remove_subdir(struct dentry * dentry)1322 static void afs_dir_remove_subdir(struct dentry *dentry)
1323 {
1324 if (d_really_is_positive(dentry)) {
1325 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1326
1327 clear_nlink(&vnode->vfs_inode);
1328 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1329 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1330 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1331 }
1332 }
1333
1334 /*
1335 * remove a directory from an AFS filesystem
1336 */
afs_rmdir(struct inode * dir,struct dentry * dentry)1337 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1338 {
1339 struct afs_status_cb *scb;
1340 struct afs_fs_cursor fc;
1341 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
1342 struct key *key;
1343 afs_dataversion_t data_version;
1344 int ret;
1345
1346 _enter("{%llx:%llu},{%pd}",
1347 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1348
1349 scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
1350 if (!scb)
1351 return -ENOMEM;
1352
1353 key = afs_request_key(dvnode->volume->cell);
1354 if (IS_ERR(key)) {
1355 ret = PTR_ERR(key);
1356 goto error;
1357 }
1358
1359 /* Try to make sure we have a callback promise on the victim. */
1360 if (d_really_is_positive(dentry)) {
1361 vnode = AFS_FS_I(d_inode(dentry));
1362 ret = afs_validate(vnode, key);
1363 if (ret < 0)
1364 goto error_key;
1365 }
1366
1367 if (vnode) {
1368 ret = down_write_killable(&vnode->rmdir_lock);
1369 if (ret < 0)
1370 goto error_key;
1371 }
1372
1373 ret = -ERESTARTSYS;
1374 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1375 data_version = dvnode->status.data_version + 1;
1376
1377 while (afs_select_fileserver(&fc)) {
1378 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1379 afs_fs_remove(&fc, vnode, dentry->d_name.name, true, scb);
1380 }
1381
1382 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1383 &data_version, scb);
1384 afs_update_dentry_version(&fc, dentry, scb);
1385 ret = afs_end_vnode_operation(&fc);
1386 if (ret == 0) {
1387 afs_dir_remove_subdir(dentry);
1388 down_write(&dvnode->validate_lock);
1389 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1390 dvnode->status.data_version == data_version)
1391 afs_edit_dir_remove(dvnode, &dentry->d_name,
1392 afs_edit_dir_for_rmdir);
1393 up_write(&dvnode->validate_lock);
1394 }
1395 }
1396
1397 if (vnode)
1398 up_write(&vnode->rmdir_lock);
1399 error_key:
1400 key_put(key);
1401 error:
1402 kfree(scb);
1403 return ret;
1404 }
1405
1406 /*
1407 * Remove a link to a file or symlink from a directory.
1408 *
1409 * If the file was not deleted due to excess hard links, the fileserver will
1410 * break the callback promise on the file - if it had one - before it returns
1411 * to us, and if it was deleted, it won't
1412 *
1413 * However, if we didn't have a callback promise outstanding, or it was
1414 * outstanding on a different server, then it won't break it either...
1415 */
afs_dir_remove_link(struct afs_vnode * dvnode,struct dentry * dentry,struct key * key)1416 static int afs_dir_remove_link(struct afs_vnode *dvnode, struct dentry *dentry,
1417 struct key *key)
1418 {
1419 int ret = 0;
1420
1421 if (d_really_is_positive(dentry)) {
1422 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1423
1424 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
1425 /* Already done */
1426 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
1427 write_seqlock(&vnode->cb_lock);
1428 drop_nlink(&vnode->vfs_inode);
1429 if (vnode->vfs_inode.i_nlink == 0) {
1430 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1431 __afs_break_callback(vnode, afs_cb_break_for_unlink);
1432 }
1433 write_sequnlock(&vnode->cb_lock);
1434 ret = 0;
1435 } else {
1436 afs_break_callback(vnode, afs_cb_break_for_unlink);
1437
1438 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1439 kdebug("AFS_VNODE_DELETED");
1440
1441 ret = afs_validate(vnode, key);
1442 if (ret == -ESTALE)
1443 ret = 0;
1444 }
1445 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
1446 }
1447
1448 return ret;
1449 }
1450
1451 /*
1452 * Remove a file or symlink from an AFS filesystem.
1453 */
afs_unlink(struct inode * dir,struct dentry * dentry)1454 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1455 {
1456 struct afs_fs_cursor fc;
1457 struct afs_status_cb *scb;
1458 struct afs_vnode *dvnode = AFS_FS_I(dir);
1459 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1460 struct key *key;
1461 bool need_rehash = false;
1462 int ret;
1463
1464 _enter("{%llx:%llu},{%pd}",
1465 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1466
1467 if (dentry->d_name.len >= AFSNAMEMAX)
1468 return -ENAMETOOLONG;
1469
1470 ret = -ENOMEM;
1471 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1472 if (!scb)
1473 goto error;
1474
1475 key = afs_request_key(dvnode->volume->cell);
1476 if (IS_ERR(key)) {
1477 ret = PTR_ERR(key);
1478 goto error_scb;
1479 }
1480
1481 /* Try to make sure we have a callback promise on the victim. */
1482 ret = afs_validate(vnode, key);
1483 if (ret < 0)
1484 goto error_key;
1485
1486 spin_lock(&dentry->d_lock);
1487 if (d_count(dentry) > 1) {
1488 spin_unlock(&dentry->d_lock);
1489 /* Start asynchronous writeout of the inode */
1490 write_inode_now(d_inode(dentry), 0);
1491 ret = afs_sillyrename(dvnode, vnode, dentry, key);
1492 goto error_key;
1493 }
1494 if (!d_unhashed(dentry)) {
1495 /* Prevent a race with RCU lookup. */
1496 __d_drop(dentry);
1497 need_rehash = true;
1498 }
1499 spin_unlock(&dentry->d_lock);
1500
1501 ret = -ERESTARTSYS;
1502 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1503 afs_dataversion_t data_version = dvnode->status.data_version + 1;
1504 afs_dataversion_t data_version_2 = vnode->status.data_version;
1505
1506 while (afs_select_fileserver(&fc)) {
1507 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1508 fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
1509
1510 if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) &&
1511 !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) {
1512 yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name,
1513 &scb[0], &scb[1]);
1514 if (fc.ac.error != -ECONNABORTED ||
1515 fc.ac.abort_code != RXGEN_OPCODE)
1516 continue;
1517 set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags);
1518 }
1519
1520 afs_fs_remove(&fc, vnode, dentry->d_name.name, false, &scb[0]);
1521 }
1522
1523 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1524 &data_version, &scb[0]);
1525 afs_vnode_commit_status(&fc, vnode, fc.cb_break_2,
1526 &data_version_2, &scb[1]);
1527 afs_update_dentry_version(&fc, dentry, &scb[0]);
1528 ret = afs_end_vnode_operation(&fc);
1529 if (ret == 0 && !(scb[1].have_status || scb[1].have_error))
1530 ret = afs_dir_remove_link(dvnode, dentry, key);
1531
1532 if (ret == 0) {
1533 down_write(&dvnode->validate_lock);
1534 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1535 dvnode->status.data_version == data_version)
1536 afs_edit_dir_remove(dvnode, &dentry->d_name,
1537 afs_edit_dir_for_unlink);
1538 up_write(&dvnode->validate_lock);
1539 }
1540 }
1541
1542 if (need_rehash && ret < 0 && ret != -ENOENT)
1543 d_rehash(dentry);
1544
1545 error_key:
1546 key_put(key);
1547 error_scb:
1548 kfree(scb);
1549 error:
1550 _leave(" = %d", ret);
1551 return ret;
1552 }
1553
1554 /*
1555 * create a regular file on an AFS filesystem
1556 */
afs_create(struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)1557 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1558 bool excl)
1559 {
1560 struct afs_iget_data iget_data;
1561 struct afs_fs_cursor fc;
1562 struct afs_status_cb *scb;
1563 struct afs_vnode *dvnode = AFS_FS_I(dir);
1564 struct key *key;
1565 afs_dataversion_t data_version;
1566 int ret;
1567
1568 mode |= S_IFREG;
1569
1570 _enter("{%llx:%llu},{%pd},%ho,",
1571 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1572
1573 ret = -ENAMETOOLONG;
1574 if (dentry->d_name.len >= AFSNAMEMAX)
1575 goto error;
1576
1577 key = afs_request_key(dvnode->volume->cell);
1578 if (IS_ERR(key)) {
1579 ret = PTR_ERR(key);
1580 goto error;
1581 }
1582
1583 ret = -ENOMEM;
1584 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1585 if (!scb)
1586 goto error_scb;
1587
1588 ret = -ERESTARTSYS;
1589 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1590 data_version = dvnode->status.data_version + 1;
1591
1592 while (afs_select_fileserver(&fc)) {
1593 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1594 afs_prep_for_new_inode(&fc, &iget_data);
1595 afs_fs_create(&fc, dentry->d_name.name, mode,
1596 &scb[0], &iget_data.fid, &scb[1]);
1597 }
1598
1599 afs_check_for_remote_deletion(&fc, dvnode);
1600 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1601 &data_version, &scb[0]);
1602 afs_update_dentry_version(&fc, dentry, &scb[0]);
1603 afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
1604 ret = afs_end_vnode_operation(&fc);
1605 if (ret < 0)
1606 goto error_key;
1607 } else {
1608 goto error_key;
1609 }
1610
1611 down_write(&dvnode->validate_lock);
1612 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1613 dvnode->status.data_version == data_version)
1614 afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
1615 afs_edit_dir_for_create);
1616 up_write(&dvnode->validate_lock);
1617
1618 kfree(scb);
1619 key_put(key);
1620 _leave(" = 0");
1621 return 0;
1622
1623 error_scb:
1624 kfree(scb);
1625 error_key:
1626 key_put(key);
1627 error:
1628 d_drop(dentry);
1629 _leave(" = %d", ret);
1630 return ret;
1631 }
1632
1633 /*
1634 * create a hard link between files in an AFS filesystem
1635 */
afs_link(struct dentry * from,struct inode * dir,struct dentry * dentry)1636 static int afs_link(struct dentry *from, struct inode *dir,
1637 struct dentry *dentry)
1638 {
1639 struct afs_fs_cursor fc;
1640 struct afs_status_cb *scb;
1641 struct afs_vnode *dvnode = AFS_FS_I(dir);
1642 struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
1643 struct key *key;
1644 afs_dataversion_t data_version;
1645 int ret;
1646
1647 _enter("{%llx:%llu},{%llx:%llu},{%pd}",
1648 vnode->fid.vid, vnode->fid.vnode,
1649 dvnode->fid.vid, dvnode->fid.vnode,
1650 dentry);
1651
1652 ret = -ENAMETOOLONG;
1653 if (dentry->d_name.len >= AFSNAMEMAX)
1654 goto error;
1655
1656 ret = -ENOMEM;
1657 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1658 if (!scb)
1659 goto error;
1660
1661 key = afs_request_key(dvnode->volume->cell);
1662 if (IS_ERR(key)) {
1663 ret = PTR_ERR(key);
1664 goto error_scb;
1665 }
1666
1667 ret = -ERESTARTSYS;
1668 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1669 data_version = dvnode->status.data_version + 1;
1670
1671 if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
1672 afs_end_vnode_operation(&fc);
1673 goto error_key;
1674 }
1675
1676 while (afs_select_fileserver(&fc)) {
1677 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1678 fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
1679 afs_fs_link(&fc, vnode, dentry->d_name.name,
1680 &scb[0], &scb[1]);
1681 }
1682
1683 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1684 &data_version, &scb[0]);
1685 afs_vnode_commit_status(&fc, vnode, fc.cb_break_2,
1686 NULL, &scb[1]);
1687 ihold(&vnode->vfs_inode);
1688 afs_update_dentry_version(&fc, dentry, &scb[0]);
1689 d_instantiate(dentry, &vnode->vfs_inode);
1690
1691 mutex_unlock(&vnode->io_lock);
1692 ret = afs_end_vnode_operation(&fc);
1693 if (ret < 0)
1694 goto error_key;
1695 } else {
1696 goto error_key;
1697 }
1698
1699 down_write(&dvnode->validate_lock);
1700 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1701 dvnode->status.data_version == data_version)
1702 afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid,
1703 afs_edit_dir_for_link);
1704 up_write(&dvnode->validate_lock);
1705
1706 key_put(key);
1707 kfree(scb);
1708 _leave(" = 0");
1709 return 0;
1710
1711 error_key:
1712 key_put(key);
1713 error_scb:
1714 kfree(scb);
1715 error:
1716 d_drop(dentry);
1717 _leave(" = %d", ret);
1718 return ret;
1719 }
1720
1721 /*
1722 * create a symlink in an AFS filesystem
1723 */
afs_symlink(struct inode * dir,struct dentry * dentry,const char * content)1724 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1725 const char *content)
1726 {
1727 struct afs_iget_data iget_data;
1728 struct afs_fs_cursor fc;
1729 struct afs_status_cb *scb;
1730 struct afs_vnode *dvnode = AFS_FS_I(dir);
1731 struct key *key;
1732 afs_dataversion_t data_version;
1733 int ret;
1734
1735 _enter("{%llx:%llu},{%pd},%s",
1736 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1737 content);
1738
1739 ret = -ENAMETOOLONG;
1740 if (dentry->d_name.len >= AFSNAMEMAX)
1741 goto error;
1742
1743 ret = -EINVAL;
1744 if (strlen(content) >= AFSPATHMAX)
1745 goto error;
1746
1747 ret = -ENOMEM;
1748 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1749 if (!scb)
1750 goto error;
1751
1752 key = afs_request_key(dvnode->volume->cell);
1753 if (IS_ERR(key)) {
1754 ret = PTR_ERR(key);
1755 goto error_scb;
1756 }
1757
1758 ret = -ERESTARTSYS;
1759 if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
1760 data_version = dvnode->status.data_version + 1;
1761
1762 while (afs_select_fileserver(&fc)) {
1763 fc.cb_break = afs_calc_vnode_cb_break(dvnode);
1764 afs_prep_for_new_inode(&fc, &iget_data);
1765 afs_fs_symlink(&fc, dentry->d_name.name, content,
1766 &scb[0], &iget_data.fid, &scb[1]);
1767 }
1768
1769 afs_check_for_remote_deletion(&fc, dvnode);
1770 afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
1771 &data_version, &scb[0]);
1772 afs_update_dentry_version(&fc, dentry, &scb[0]);
1773 afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
1774 ret = afs_end_vnode_operation(&fc);
1775 if (ret < 0)
1776 goto error_key;
1777 } else {
1778 goto error_key;
1779 }
1780
1781 down_write(&dvnode->validate_lock);
1782 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
1783 dvnode->status.data_version == data_version)
1784 afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
1785 afs_edit_dir_for_symlink);
1786 up_write(&dvnode->validate_lock);
1787
1788 key_put(key);
1789 kfree(scb);
1790 _leave(" = 0");
1791 return 0;
1792
1793 error_key:
1794 key_put(key);
1795 error_scb:
1796 kfree(scb);
1797 error:
1798 d_drop(dentry);
1799 _leave(" = %d", ret);
1800 return ret;
1801 }
1802
1803 /*
1804 * rename a file in an AFS filesystem and/or move it between directories
1805 */
afs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)1806 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1807 struct inode *new_dir, struct dentry *new_dentry,
1808 unsigned int flags)
1809 {
1810 struct afs_fs_cursor fc;
1811 struct afs_status_cb *scb;
1812 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1813 struct dentry *tmp = NULL, *rehash = NULL;
1814 struct inode *new_inode;
1815 struct key *key;
1816 afs_dataversion_t orig_data_version;
1817 afs_dataversion_t new_data_version;
1818 bool new_negative = d_is_negative(new_dentry);
1819 int ret;
1820
1821 if (flags)
1822 return -EINVAL;
1823
1824 /* Don't allow silly-rename files be moved around. */
1825 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
1826 return -EINVAL;
1827
1828 vnode = AFS_FS_I(d_inode(old_dentry));
1829 orig_dvnode = AFS_FS_I(old_dir);
1830 new_dvnode = AFS_FS_I(new_dir);
1831
1832 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
1833 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1834 vnode->fid.vid, vnode->fid.vnode,
1835 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1836 new_dentry);
1837
1838 ret = -ENOMEM;
1839 scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL);
1840 if (!scb)
1841 goto error;
1842
1843 key = afs_request_key(orig_dvnode->volume->cell);
1844 if (IS_ERR(key)) {
1845 ret = PTR_ERR(key);
1846 goto error_scb;
1847 }
1848
1849 /* For non-directories, check whether the target is busy and if so,
1850 * make a copy of the dentry and then do a silly-rename. If the
1851 * silly-rename succeeds, the copied dentry is hashed and becomes the
1852 * new target.
1853 */
1854 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
1855 /* To prevent any new references to the target during the
1856 * rename, we unhash the dentry in advance.
1857 */
1858 if (!d_unhashed(new_dentry)) {
1859 d_drop(new_dentry);
1860 rehash = new_dentry;
1861 }
1862
1863 if (d_count(new_dentry) > 2) {
1864 /* copy the target dentry's name */
1865 ret = -ENOMEM;
1866 tmp = d_alloc(new_dentry->d_parent,
1867 &new_dentry->d_name);
1868 if (!tmp)
1869 goto error_rehash;
1870
1871 ret = afs_sillyrename(new_dvnode,
1872 AFS_FS_I(d_inode(new_dentry)),
1873 new_dentry, key);
1874 if (ret)
1875 goto error_rehash;
1876
1877 new_dentry = tmp;
1878 rehash = NULL;
1879 new_negative = true;
1880 }
1881 }
1882
1883 /* This bit is potentially nasty as there's a potential race with
1884 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
1885 * to reflect it's new parent's new data_version after the op, but
1886 * d_revalidate may see old_dentry between the op having taken place
1887 * and the version being updated.
1888 *
1889 * So drop the old_dentry for now to make other threads go through
1890 * lookup instead - which we hold a lock against.
1891 */
1892 d_drop(old_dentry);
1893
1894 ret = -ERESTARTSYS;
1895 if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) {
1896 orig_data_version = orig_dvnode->status.data_version + 1;
1897
1898 if (orig_dvnode != new_dvnode) {
1899 if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
1900 afs_end_vnode_operation(&fc);
1901 goto error_rehash_old;
1902 }
1903 new_data_version = new_dvnode->status.data_version + 1;
1904 } else {
1905 new_data_version = orig_data_version;
1906 }
1907
1908 while (afs_select_fileserver(&fc)) {
1909 fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode);
1910 fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode);
1911 afs_fs_rename(&fc, old_dentry->d_name.name,
1912 new_dvnode, new_dentry->d_name.name,
1913 &scb[0], &scb[1]);
1914 }
1915
1916 afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break,
1917 &orig_data_version, &scb[0]);
1918 if (new_dvnode != orig_dvnode) {
1919 afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2,
1920 &new_data_version, &scb[1]);
1921 mutex_unlock(&new_dvnode->io_lock);
1922 }
1923 ret = afs_end_vnode_operation(&fc);
1924 if (ret < 0)
1925 goto error_rehash_old;
1926 }
1927
1928 if (ret == 0) {
1929 if (rehash)
1930 d_rehash(rehash);
1931 down_write(&orig_dvnode->validate_lock);
1932 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
1933 orig_dvnode->status.data_version == orig_data_version)
1934 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1935 afs_edit_dir_for_rename_0);
1936 if (orig_dvnode != new_dvnode) {
1937 up_write(&orig_dvnode->validate_lock);
1938
1939 down_write(&new_dvnode->validate_lock);
1940 }
1941 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
1942 orig_dvnode->status.data_version == new_data_version) {
1943 if (!new_negative)
1944 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1945 afs_edit_dir_for_rename_1);
1946
1947 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1948 &vnode->fid, afs_edit_dir_for_rename_2);
1949 }
1950
1951 new_inode = d_inode(new_dentry);
1952 if (new_inode) {
1953 spin_lock(&new_inode->i_lock);
1954 if (new_inode->i_nlink > 0)
1955 drop_nlink(new_inode);
1956 spin_unlock(&new_inode->i_lock);
1957 }
1958
1959 /* Now we can update d_fsdata on the dentries to reflect their
1960 * new parent's data_version.
1961 *
1962 * Note that if we ever implement RENAME_EXCHANGE, we'll have
1963 * to update both dentries with opposing dir versions.
1964 */
1965 afs_update_dentry_version(&fc, old_dentry, &scb[1]);
1966 afs_update_dentry_version(&fc, new_dentry, &scb[1]);
1967 d_move(old_dentry, new_dentry);
1968 up_write(&new_dvnode->validate_lock);
1969 goto error_tmp;
1970 }
1971
1972 error_rehash_old:
1973 d_rehash(new_dentry);
1974 error_rehash:
1975 if (rehash)
1976 d_rehash(rehash);
1977 error_tmp:
1978 if (tmp)
1979 dput(tmp);
1980 key_put(key);
1981 error_scb:
1982 kfree(scb);
1983 error:
1984 _leave(" = %d", ret);
1985 return ret;
1986 }
1987
1988 /*
1989 * Release a directory page and clean up its private state if it's not busy
1990 * - return true if the page can now be released, false if not
1991 */
afs_dir_releasepage(struct page * page,gfp_t gfp_flags)1992 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
1993 {
1994 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1995
1996 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
1997
1998 set_page_private(page, 0);
1999 ClearPagePrivate(page);
2000
2001 /* The directory will need reloading. */
2002 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2003 afs_stat_v(dvnode, n_relpg);
2004 return 1;
2005 }
2006
2007 /*
2008 * invalidate part or all of a page
2009 * - release a page and clean up its private data if offset is 0 (indicating
2010 * the entire page)
2011 */
afs_dir_invalidatepage(struct page * page,unsigned int offset,unsigned int length)2012 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
2013 unsigned int length)
2014 {
2015 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
2016
2017 _enter("{%lu},%u,%u", page->index, offset, length);
2018
2019 BUG_ON(!PageLocked(page));
2020
2021 /* The directory will need reloading. */
2022 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
2023 afs_stat_v(dvnode, n_inval);
2024
2025 /* we clean up only if the entire page is being invalidated */
2026 if (offset == 0 && length == PAGE_SIZE) {
2027 set_page_private(page, 0);
2028 ClearPagePrivate(page);
2029 }
2030 }
2031