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afs: Do better accretion of small writes on newly created content
[linux/fpc-iii.git] / fs / afs / dir.c
blob5889f70d4d273a8622aefbd32148e8ff8e1b7d55
1 /* dir.c: AFS filesystem directory handling
2 *
3 * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/fs.h>
14 #include <linux/namei.h>
15 #include <linux/pagemap.h>
16 #include <linux/swap.h>
17 #include <linux/ctype.h>
18 #include <linux/sched.h>
19 #include <linux/task_io_accounting_ops.h>
20 #include "internal.h"
21 #include "xdr_fs.h"
22
23 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
24 unsigned int flags);
25 static int afs_dir_open(struct inode *inode, struct file *file);
26 static int afs_readdir(struct file *file, struct dir_context *ctx);
27 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
28 static int afs_d_delete(const struct dentry *dentry);
29 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
30 loff_t fpos, u64 ino, unsigned dtype);
31 static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
32 loff_t fpos, u64 ino, unsigned dtype);
33 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
34 bool excl);
35 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
36 static int afs_rmdir(struct inode *dir, struct dentry *dentry);
37 static int afs_unlink(struct inode *dir, struct dentry *dentry);
38 static int afs_link(struct dentry *from, struct inode *dir,
39 struct dentry *dentry);
40 static int afs_symlink(struct inode *dir, struct dentry *dentry,
41 const char *content);
42 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
43 struct inode *new_dir, struct dentry *new_dentry,
44 unsigned int flags);
45 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags);
46 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
47 unsigned int length);
48
49 static int afs_dir_set_page_dirty(struct page *page)
50 {
51 BUG(); /* This should never happen. */
52 }
53
54 const struct file_operations afs_dir_file_operations = {
55 .open = afs_dir_open,
56 .release = afs_release,
57 .iterate_shared = afs_readdir,
58 .lock = afs_lock,
59 .llseek = generic_file_llseek,
60 };
61
62 const struct inode_operations afs_dir_inode_operations = {
63 .create = afs_create,
64 .lookup = afs_lookup,
65 .link = afs_link,
66 .unlink = afs_unlink,
67 .symlink = afs_symlink,
68 .mkdir = afs_mkdir,
69 .rmdir = afs_rmdir,
70 .rename = afs_rename,
71 .permission = afs_permission,
72 .getattr = afs_getattr,
73 .setattr = afs_setattr,
74 .listxattr = afs_listxattr,
75 };
76
77 const struct address_space_operations afs_dir_aops = {
78 .set_page_dirty = afs_dir_set_page_dirty,
79 .releasepage = afs_dir_releasepage,
80 .invalidatepage = afs_dir_invalidatepage,
81 };
82
83 const struct dentry_operations afs_fs_dentry_operations = {
84 .d_revalidate = afs_d_revalidate,
85 .d_delete = afs_d_delete,
86 .d_release = afs_d_release,
87 .d_automount = afs_d_automount,
88 };
89
90 struct afs_lookup_one_cookie {
91 struct dir_context ctx;
92 struct qstr name;
93 bool found;
94 struct afs_fid fid;
95 };
96
97 struct afs_lookup_cookie {
98 struct dir_context ctx;
99 struct qstr name;
100 bool found;
101 bool one_only;
102 unsigned short nr_fids;
103 struct afs_file_status *statuses;
104 struct afs_callback *callbacks;
105 struct afs_fid fids[50];
106 };
107
108 /*
109 * check that a directory page is valid
110 */
111 static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
112 loff_t i_size)
113 {
114 struct afs_xdr_dir_page *dbuf;
115 loff_t latter, off;
116 int tmp, qty;
117
118 /* Determine how many magic numbers there should be in this page, but
119 * we must take care because the directory may change size under us.
120 */
121 off = page_offset(page);
122 if (i_size <= off)
123 goto checked;
124
125 latter = i_size - off;
126 if (latter >= PAGE_SIZE)
127 qty = PAGE_SIZE;
128 else
129 qty = latter;
130 qty /= sizeof(union afs_xdr_dir_block);
131
132 /* check them */
133 dbuf = kmap(page);
134 for (tmp = 0; tmp < qty; tmp++) {
135 if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
136 printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
137 __func__, dvnode->vfs_inode.i_ino, tmp, qty,
138 ntohs(dbuf->blocks[tmp].hdr.magic));
139 trace_afs_dir_check_failed(dvnode, off, i_size);
140 kunmap(page);
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 * open an AFS directory file
163 */
164 static int afs_dir_open(struct inode *inode, struct file *file)
165 {
166 _enter("{%lu}", inode->i_ino);
167
168 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
169 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
170
171 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
172 return -ENOENT;
173
174 return afs_open(inode, file);
175 }
176
177 /*
178 * Read the directory into the pagecache in one go, scrubbing the previous
179 * contents. The list of pages is returned, pinning them so that they don't
180 * get reclaimed during the iteration.
181 */
182 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
183 {
184 struct afs_read *req;
185 loff_t i_size;
186 int nr_pages, nr_inline, i, n;
187 int ret = -ENOMEM;
188
189 retry:
190 i_size = i_size_read(&dvnode->vfs_inode);
191 if (i_size < 2048)
192 return ERR_PTR(-EIO);
193 if (i_size > 2048 * 1024)
194 return ERR_PTR(-EFBIG);
195
196 _enter("%llu", i_size);
197
198 /* Get a request record to hold the page list. We want to hold it
199 * inline if we can, but we don't want to make an order 1 allocation.
200 */
201 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
202 nr_inline = nr_pages;
203 if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
204 nr_inline = 0;
205
206 req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline,
207 GFP_KERNEL);
208 if (!req)
209 return ERR_PTR(-ENOMEM);
210
211 refcount_set(&req->usage, 1);
212 req->nr_pages = nr_pages;
213 req->actual_len = i_size; /* May change */
214 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
215 req->data_version = dvnode->status.data_version; /* May change */
216 if (nr_inline > 0) {
217 req->pages = req->array;
218 } else {
219 req->pages = kcalloc(nr_pages, sizeof(struct page *),
220 GFP_KERNEL);
221 if (!req->pages)
222 goto error;
223 }
224
225 /* Get a list of all the pages that hold or will hold the directory
226 * content. We need to fill in any gaps that we might find where the
227 * memory reclaimer has been at work. If there are any gaps, we will
228 * need to reread the entire directory contents.
229 */
230 i = 0;
231 do {
232 n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
233 req->nr_pages - i,
234 req->pages + i);
235 _debug("find %u at %u/%u", n, i, req->nr_pages);
236 if (n == 0) {
237 gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;
238
239 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
240 afs_stat_v(dvnode, n_inval);
241
242 ret = -ENOMEM;
243 req->pages[i] = __page_cache_alloc(gfp);
244 if (!req->pages[i])
245 goto error;
246 ret = add_to_page_cache_lru(req->pages[i],
247 dvnode->vfs_inode.i_mapping,
248 i, gfp);
249 if (ret < 0)
250 goto error;
251
252 set_page_private(req->pages[i], 1);
253 SetPagePrivate(req->pages[i]);
254 unlock_page(req->pages[i]);
255 i++;
256 } else {
257 i += n;
258 }
259 } while (i < req->nr_pages);
260
261 /* If we're going to reload, we need to lock all the pages to prevent
262 * races.
263 */
264 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
265 ret = -ERESTARTSYS;
266 for (i = 0; i < req->nr_pages; i++)
267 if (lock_page_killable(req->pages[i]) < 0)
268 goto error_unlock;
269
270 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
271 goto success;
272
273 ret = afs_fetch_data(dvnode, key, req);
274 if (ret < 0)
275 goto error_unlock_all;
276
277 task_io_account_read(PAGE_SIZE * req->nr_pages);
278
279 if (req->len < req->file_size)
280 goto content_has_grown;
281
282 /* Validate the data we just read. */
283 ret = -EIO;
284 for (i = 0; i < req->nr_pages; i++)
285 if (!afs_dir_check_page(dvnode, req->pages[i],
286 req->actual_len))
287 goto error_unlock_all;
288
289 // TODO: Trim excess pages
290
291 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
292 }
293
294 success:
295 i = req->nr_pages;
296 while (i > 0)
297 unlock_page(req->pages[--i]);
298 return req;
299
300 error_unlock_all:
301 i = req->nr_pages;
302 error_unlock:
303 while (i > 0)
304 unlock_page(req->pages[--i]);
305 error:
306 afs_put_read(req);
307 _leave(" = %d", ret);
308 return ERR_PTR(ret);
309
310 content_has_grown:
311 i = req->nr_pages;
312 while (i > 0)
313 unlock_page(req->pages[--i]);
314 afs_put_read(req);
315 goto retry;
316 }
317
318 /*
319 * deal with one block in an AFS directory
320 */
321 static int afs_dir_iterate_block(struct dir_context *ctx,
322 union afs_xdr_dir_block *block,
323 unsigned blkoff)
324 {
325 union afs_xdr_dirent *dire;
326 unsigned offset, next, curr;
327 size_t nlen;
328 int tmp;
329
330 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
331
332 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
333
334 /* walk through the block, an entry at a time */
335 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
336 offset < AFS_DIR_SLOTS_PER_BLOCK;
337 offset = next
338 ) {
339 next = offset + 1;
340
341 /* skip entries marked unused in the bitmap */
342 if (!(block->hdr.bitmap[offset / 8] &
343 (1 << (offset % 8)))) {
344 _debug("ENT[%zu.%u]: unused",
345 blkoff / sizeof(union afs_xdr_dir_block), offset);
346 if (offset >= curr)
347 ctx->pos = blkoff +
348 next * sizeof(union afs_xdr_dirent);
349 continue;
350 }
351
352 /* got a valid entry */
353 dire = &block->dirents[offset];
354 nlen = strnlen(dire->u.name,
355 sizeof(*block) -
356 offset * sizeof(union afs_xdr_dirent));
357
358 _debug("ENT[%zu.%u]: %s %zu \"%s\"",
359 blkoff / sizeof(union afs_xdr_dir_block), offset,
360 (offset < curr ? "skip" : "fill"),
361 nlen, dire->u.name);
362
363 /* work out where the next possible entry is */
364 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) {
365 if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
366 _debug("ENT[%zu.%u]:"
367 " %u travelled beyond end dir block"
368 " (len %u/%zu)",
369 blkoff / sizeof(union afs_xdr_dir_block),
370 offset, next, tmp, nlen);
371 return -EIO;
372 }
373 if (!(block->hdr.bitmap[next / 8] &
374 (1 << (next % 8)))) {
375 _debug("ENT[%zu.%u]:"
376 " %u unmarked extension (len %u/%zu)",
377 blkoff / sizeof(union afs_xdr_dir_block),
378 offset, next, tmp, nlen);
379 return -EIO;
380 }
381
382 _debug("ENT[%zu.%u]: ext %u/%zu",
383 blkoff / sizeof(union afs_xdr_dir_block),
384 next, tmp, nlen);
385 next++;
386 }
387
388 /* skip if starts before the current position */
389 if (offset < curr)
390 continue;
391
392 /* found the next entry */
393 if (!dir_emit(ctx, dire->u.name, nlen,
394 ntohl(dire->u.vnode),
395 (ctx->actor == afs_lookup_filldir ||
396 ctx->actor == afs_lookup_one_filldir)?
397 ntohl(dire->u.unique) : DT_UNKNOWN)) {
398 _leave(" = 0 [full]");
399 return 0;
400 }
401
402 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
403 }
404
405 _leave(" = 1 [more]");
406 return 1;
407 }
408
409 /*
410 * iterate through the data blob that lists the contents of an AFS directory
411 */
412 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
413 struct key *key)
414 {
415 struct afs_vnode *dvnode = AFS_FS_I(dir);
416 struct afs_xdr_dir_page *dbuf;
417 union afs_xdr_dir_block *dblock;
418 struct afs_read *req;
419 struct page *page;
420 unsigned blkoff, limit;
421 int ret;
422
423 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
424
425 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
426 _leave(" = -ESTALE");
427 return -ESTALE;
428 }
429
430 req = afs_read_dir(dvnode, key);
431 if (IS_ERR(req))
432 return PTR_ERR(req);
433
434 /* round the file position up to the next entry boundary */
435 ctx->pos += sizeof(union afs_xdr_dirent) - 1;
436 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
437
438 /* walk through the blocks in sequence */
439 ret = 0;
440 while (ctx->pos < req->actual_len) {
441 blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
442
443 /* Fetch the appropriate page from the directory and re-add it
444 * to the LRU.
445 */
446 page = req->pages[blkoff / PAGE_SIZE];
447 if (!page) {
448 ret = -EIO;
449 break;
450 }
451 mark_page_accessed(page);
452
453 limit = blkoff & ~(PAGE_SIZE - 1);
454
455 dbuf = kmap(page);
456
457 /* deal with the individual blocks stashed on this page */
458 do {
459 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
460 sizeof(union afs_xdr_dir_block)];
461 ret = afs_dir_iterate_block(ctx, dblock, blkoff);
462 if (ret != 1) {
463 kunmap(page);
464 goto out;
465 }
466
467 blkoff += sizeof(union afs_xdr_dir_block);
468
469 } while (ctx->pos < dir->i_size && blkoff < limit);
470
471 kunmap(page);
472 ret = 0;
473 }
474
475 out:
476 afs_put_read(req);
477 _leave(" = %d", ret);
478 return ret;
479 }
480
481 /*
482 * read an AFS directory
483 */
484 static int afs_readdir(struct file *file, struct dir_context *ctx)
485 {
486 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file));
487 }
488
489 /*
490 * Search the directory for a single name
491 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
492 * uniquifier through dtype
493 */
494 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
495 int nlen, loff_t fpos, u64 ino, unsigned dtype)
496 {
497 struct afs_lookup_one_cookie *cookie =
498 container_of(ctx, struct afs_lookup_one_cookie, ctx);
499
500 _enter("{%s,%u},%s,%u,,%llu,%u",
501 cookie->name.name, cookie->name.len, name, nlen,
502 (unsigned long long) ino, dtype);
503
504 /* insanity checks first */
505 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
506 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
507
508 if (cookie->name.len != nlen ||
509 memcmp(cookie->name.name, name, nlen) != 0) {
510 _leave(" = 0 [no]");
511 return 0;
512 }
513
514 cookie->fid.vnode = ino;
515 cookie->fid.unique = dtype;
516 cookie->found = 1;
517
518 _leave(" = -1 [found]");
519 return -1;
520 }
521
522 /*
523 * Do a lookup of a single name in a directory
524 * - just returns the FID the dentry name maps to if found
525 */
526 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
527 struct afs_fid *fid, struct key *key)
528 {
529 struct afs_super_info *as = dir->i_sb->s_fs_info;
530 struct afs_lookup_one_cookie cookie = {
531 .ctx.actor = afs_lookup_one_filldir,
532 .name = dentry->d_name,
533 .fid.vid = as->volume->vid
534 };
535 int ret;
536
537 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
538
539 /* search the directory */
540 ret = afs_dir_iterate(dir, &cookie.ctx, key);
541 if (ret < 0) {
542 _leave(" = %d [iter]", ret);
543 return ret;
544 }
545
546 ret = -ENOENT;
547 if (!cookie.found) {
548 _leave(" = -ENOENT [not found]");
549 return -ENOENT;
550 }
551
552 *fid = cookie.fid;
553 _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
554 return 0;
555 }
556
557 /*
558 * search the directory for a name
559 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
560 * uniquifier through dtype
561 */
562 static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
563 int nlen, loff_t fpos, u64 ino, unsigned dtype)
564 {
565 struct afs_lookup_cookie *cookie =
566 container_of(ctx, struct afs_lookup_cookie, ctx);
567 int ret;
568
569 _enter("{%s,%u},%s,%u,,%llu,%u",
570 cookie->name.name, cookie->name.len, name, nlen,
571 (unsigned long long) ino, dtype);
572
573 /* insanity checks first */
574 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
575 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
576
577 if (cookie->found) {
578 if (cookie->nr_fids < 50) {
579 cookie->fids[cookie->nr_fids].vnode = ino;
580 cookie->fids[cookie->nr_fids].unique = dtype;
581 cookie->nr_fids++;
582 }
583 } else if (cookie->name.len == nlen &&
584 memcmp(cookie->name.name, name, nlen) == 0) {
585 cookie->fids[0].vnode = ino;
586 cookie->fids[0].unique = dtype;
587 cookie->found = 1;
588 if (cookie->one_only)
589 return -1;
590 }
591
592 ret = cookie->nr_fids >= 50 ? -1 : 0;
593 _leave(" = %d", ret);
594 return ret;
595 }
596
597 /*
598 * Do a lookup in a directory. We make use of bulk lookup to query a slew of
599 * files in one go and create inodes for them. The inode of the file we were
600 * asked for is returned.
601 */
602 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
603 struct key *key)
604 {
605 struct afs_lookup_cookie *cookie;
606 struct afs_cb_interest *cbi = NULL;
607 struct afs_super_info *as = dir->i_sb->s_fs_info;
608 struct afs_iget_data data;
609 struct afs_fs_cursor fc;
610 struct afs_vnode *dvnode = AFS_FS_I(dir);
611 struct inode *inode = NULL;
612 int ret, i;
613
614 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
615
616 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
617 if (!cookie)
618 return ERR_PTR(-ENOMEM);
619
620 cookie->ctx.actor = afs_lookup_filldir;
621 cookie->name = dentry->d_name;
622 cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */
623
624 read_seqlock_excl(&dvnode->cb_lock);
625 if (dvnode->cb_interest &&
626 dvnode->cb_interest->server &&
627 test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags))
628 cookie->one_only = true;
629 read_sequnlock_excl(&dvnode->cb_lock);
630
631 for (i = 0; i < 50; i++)
632 cookie->fids[i].vid = as->volume->vid;
633
634 /* search the directory */
635 ret = afs_dir_iterate(dir, &cookie->ctx, key);
636 if (ret < 0) {
637 inode = ERR_PTR(ret);
638 goto out;
639 }
640
641 inode = ERR_PTR(-ENOENT);
642 if (!cookie->found)
643 goto out;
644
645 /* Check to see if we already have an inode for the primary fid. */
646 data.volume = dvnode->volume;
647 data.fid = cookie->fids[0];
648 inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data);
649 if (inode)
650 goto out;
651
652 /* Need space for examining all the selected files */
653 inode = ERR_PTR(-ENOMEM);
654 cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status),
655 GFP_KERNEL);
656 if (!cookie->statuses)
657 goto out;
658
659 cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback),
660 GFP_KERNEL);
661 if (!cookie->callbacks)
662 goto out_s;
663
664 /* Try FS.InlineBulkStatus first. Abort codes for the individual
665 * lookups contained therein are stored in the reply without aborting
666 * the whole operation.
667 */
668 if (cookie->one_only)
669 goto no_inline_bulk_status;
670
671 inode = ERR_PTR(-ERESTARTSYS);
672 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
673 while (afs_select_fileserver(&fc)) {
674 if (test_bit(AFS_SERVER_FL_NO_IBULK,
675 &fc.cbi->server->flags)) {
676 fc.ac.abort_code = RX_INVALID_OPERATION;
677 fc.ac.error = -ECONNABORTED;
678 break;
679 }
680 afs_fs_inline_bulk_status(&fc,
681 afs_v2net(dvnode),
682 cookie->fids,
683 cookie->statuses,
684 cookie->callbacks,
685 cookie->nr_fids, NULL);
686 }
687
688 if (fc.ac.error == 0)
689 cbi = afs_get_cb_interest(fc.cbi);
690 if (fc.ac.abort_code == RX_INVALID_OPERATION)
691 set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags);
692 inode = ERR_PTR(afs_end_vnode_operation(&fc));
693 }
694
695 if (!IS_ERR(inode))
696 goto success;
697 if (fc.ac.abort_code != RX_INVALID_OPERATION)
698 goto out_c;
699
700 no_inline_bulk_status:
701 /* We could try FS.BulkStatus next, but this aborts the entire op if
702 * any of the lookups fails - so, for the moment, revert to
703 * FS.FetchStatus for just the primary fid.
704 */
705 cookie->nr_fids = 1;
706 inode = ERR_PTR(-ERESTARTSYS);
707 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
708 while (afs_select_fileserver(&fc)) {
709 afs_fs_fetch_status(&fc,
710 afs_v2net(dvnode),
711 cookie->fids,
712 cookie->statuses,
713 cookie->callbacks,
714 NULL);
715 }
716
717 if (fc.ac.error == 0)
718 cbi = afs_get_cb_interest(fc.cbi);
719 inode = ERR_PTR(afs_end_vnode_operation(&fc));
720 }
721
722 if (IS_ERR(inode))
723 goto out_c;
724
725 for (i = 0; i < cookie->nr_fids; i++)
726 cookie->statuses[i].abort_code = 0;
727
728 success:
729 /* Turn all the files into inodes and save the first one - which is the
730 * one we actually want.
731 */
732 if (cookie->statuses[0].abort_code != 0)
733 inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code));
734
735 for (i = 0; i < cookie->nr_fids; i++) {
736 struct inode *ti;
737
738 if (cookie->statuses[i].abort_code != 0)
739 continue;
740
741 ti = afs_iget(dir->i_sb, key, &cookie->fids[i],
742 &cookie->statuses[i],
743 &cookie->callbacks[i],
744 cbi);
745 if (i == 0) {
746 inode = ti;
747 } else {
748 if (!IS_ERR(ti))
749 iput(ti);
750 }
751 }
752
753 out_c:
754 afs_put_cb_interest(afs_v2net(dvnode), cbi);
755 kfree(cookie->callbacks);
756 out_s:
757 kfree(cookie->statuses);
758 out:
759 kfree(cookie);
760 return inode;
761 }
762
763 /*
764 * Look up an entry in a directory with @sys substitution.
765 */
766 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
767 struct key *key)
768 {
769 struct afs_sysnames *subs;
770 struct afs_net *net = afs_i2net(dir);
771 struct dentry *ret;
772 char *buf, *p, *name;
773 int len, i;
774
775 _enter("");
776
777 ret = ERR_PTR(-ENOMEM);
778 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
779 if (!buf)
780 goto out_p;
781 if (dentry->d_name.len > 4) {
782 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
783 p += dentry->d_name.len - 4;
784 }
785
786 /* There is an ordered list of substitutes that we have to try. */
787 read_lock(&net->sysnames_lock);
788 subs = net->sysnames;
789 refcount_inc(&subs->usage);
790 read_unlock(&net->sysnames_lock);
791
792 for (i = 0; i < subs->nr; i++) {
793 name = subs->subs[i];
794 len = dentry->d_name.len - 4 + strlen(name);
795 if (len >= AFSNAMEMAX) {
796 ret = ERR_PTR(-ENAMETOOLONG);
797 goto out_s;
798 }
799
800 strcpy(p, name);
801 ret = lookup_one_len(buf, dentry->d_parent, len);
802 if (IS_ERR(ret) || d_is_positive(ret))
803 goto out_s;
804 dput(ret);
805 }
806
807 /* We don't want to d_add() the @sys dentry here as we don't want to
808 * the cached dentry to hide changes to the sysnames list.
809 */
810 ret = NULL;
811 out_s:
812 afs_put_sysnames(subs);
813 kfree(buf);
814 out_p:
815 key_put(key);
816 return ret;
817 }
818
819 /*
820 * look up an entry in a directory
821 */
822 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
823 unsigned int flags)
824 {
825 struct afs_vnode *dvnode = AFS_FS_I(dir);
826 struct inode *inode;
827 struct key *key;
828 int ret;
829
830 _enter("{%x:%u},%p{%pd},",
831 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
832
833 ASSERTCMP(d_inode(dentry), ==, NULL);
834
835 if (dentry->d_name.len >= AFSNAMEMAX) {
836 _leave(" = -ENAMETOOLONG");
837 return ERR_PTR(-ENAMETOOLONG);
838 }
839
840 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
841 _leave(" = -ESTALE");
842 return ERR_PTR(-ESTALE);
843 }
844
845 key = afs_request_key(dvnode->volume->cell);
846 if (IS_ERR(key)) {
847 _leave(" = %ld [key]", PTR_ERR(key));
848 return ERR_CAST(key);
849 }
850
851 ret = afs_validate(dvnode, key);
852 if (ret < 0) {
853 key_put(key);
854 _leave(" = %d [val]", ret);
855 return ERR_PTR(ret);
856 }
857
858 if (dentry->d_name.len >= 4 &&
859 dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
860 dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
861 dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
862 dentry->d_name.name[dentry->d_name.len - 1] == 's')
863 return afs_lookup_atsys(dir, dentry, key);
864
865 afs_stat_v(dvnode, n_lookup);
866 inode = afs_do_lookup(dir, dentry, key);
867 if (IS_ERR(inode)) {
868 ret = PTR_ERR(inode);
869 if (ret == -ENOENT) {
870 inode = afs_try_auto_mntpt(dentry, dir);
871 if (!IS_ERR(inode)) {
872 key_put(key);
873 goto success;
874 }
875
876 ret = PTR_ERR(inode);
877 }
878
879 key_put(key);
880 if (ret == -ENOENT) {
881 d_add(dentry, NULL);
882 _leave(" = NULL [negative]");
883 return NULL;
884 }
885 _leave(" = %d [do]", ret);
886 return ERR_PTR(ret);
887 }
888 dentry->d_fsdata = (void *)(unsigned long)dvnode->status.data_version;
889
890 /* instantiate the dentry */
891 key_put(key);
892 if (IS_ERR(inode)) {
893 _leave(" = %ld", PTR_ERR(inode));
894 return ERR_CAST(inode);
895 }
896
897 success:
898 d_add(dentry, inode);
899 _leave(" = 0 { ino=%lu v=%u }",
900 d_inode(dentry)->i_ino,
901 d_inode(dentry)->i_generation);
902
903 return NULL;
904 }
905
906 /*
907 * check that a dentry lookup hit has found a valid entry
908 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
909 * inode
910 */
911 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
912 {
913 struct afs_vnode *vnode, *dir;
914 struct afs_fid uninitialized_var(fid);
915 struct dentry *parent;
916 struct inode *inode;
917 struct key *key;
918 long dir_version, de_version;
919 int ret;
920
921 if (flags & LOOKUP_RCU)
922 return -ECHILD;
923
924 if (d_really_is_positive(dentry)) {
925 vnode = AFS_FS_I(d_inode(dentry));
926 _enter("{v={%x:%u} n=%pd fl=%lx},",
927 vnode->fid.vid, vnode->fid.vnode, dentry,
928 vnode->flags);
929 } else {
930 _enter("{neg n=%pd}", dentry);
931 }
932
933 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
934 if (IS_ERR(key))
935 key = NULL;
936
937 if (d_really_is_positive(dentry)) {
938 inode = d_inode(dentry);
939 if (inode) {
940 vnode = AFS_FS_I(inode);
941 afs_validate(vnode, key);
942 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
943 goto out_bad;
944 }
945 }
946
947 /* lock down the parent dentry so we can peer at it */
948 parent = dget_parent(dentry);
949 dir = AFS_FS_I(d_inode(parent));
950
951 /* validate the parent directory */
952 afs_validate(dir, key);
953
954 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
955 _debug("%pd: parent dir deleted", dentry);
956 goto out_bad_parent;
957 }
958
959 /* We only need to invalidate a dentry if the server's copy changed
960 * behind our back. If we made the change, it's no problem. Note that
961 * on a 32-bit system, we only have 32 bits in the dentry to store the
962 * version.
963 */
964 dir_version = (long)dir->status.data_version;
965 de_version = (long)dentry->d_fsdata;
966 if (de_version == dir_version)
967 goto out_valid;
968
969 dir_version = (long)dir->invalid_before;
970 if (de_version - dir_version >= 0)
971 goto out_valid;
972
973 _debug("dir modified");
974 afs_stat_v(dir, n_reval);
975
976 /* search the directory for this vnode */
977 ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key);
978 switch (ret) {
979 case 0:
980 /* the filename maps to something */
981 if (d_really_is_negative(dentry))
982 goto out_bad_parent;
983 inode = d_inode(dentry);
984 if (is_bad_inode(inode)) {
985 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
986 dentry);
987 goto out_bad_parent;
988 }
989
990 vnode = AFS_FS_I(inode);
991
992 /* if the vnode ID has changed, then the dirent points to a
993 * different file */
994 if (fid.vnode != vnode->fid.vnode) {
995 _debug("%pd: dirent changed [%u != %u]",
996 dentry, fid.vnode,
997 vnode->fid.vnode);
998 goto not_found;
999 }
1000
1001 /* if the vnode ID uniqifier has changed, then the file has
1002 * been deleted and replaced, and the original vnode ID has
1003 * been reused */
1004 if (fid.unique != vnode->fid.unique) {
1005 _debug("%pd: file deleted (uq %u -> %u I:%u)",
1006 dentry, fid.unique,
1007 vnode->fid.unique,
1008 vnode->vfs_inode.i_generation);
1009 write_seqlock(&vnode->cb_lock);
1010 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1011 write_sequnlock(&vnode->cb_lock);
1012 goto not_found;
1013 }
1014 goto out_valid;
1015
1016 case -ENOENT:
1017 /* the filename is unknown */
1018 _debug("%pd: dirent not found", dentry);
1019 if (d_really_is_positive(dentry))
1020 goto not_found;
1021 goto out_valid;
1022
1023 default:
1024 _debug("failed to iterate dir %pd: %d",
1025 parent, ret);
1026 goto out_bad_parent;
1027 }
1028
1029 out_valid:
1030 dentry->d_fsdata = (void *)dir_version;
1031 dput(parent);
1032 key_put(key);
1033 _leave(" = 1 [valid]");
1034 return 1;
1035
1036 /* the dirent, if it exists, now points to a different vnode */
1037 not_found:
1038 spin_lock(&dentry->d_lock);
1039 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
1040 spin_unlock(&dentry->d_lock);
1041
1042 out_bad_parent:
1043 _debug("dropping dentry %pd2", dentry);
1044 dput(parent);
1045 out_bad:
1046 key_put(key);
1047
1048 _leave(" = 0 [bad]");
1049 return 0;
1050 }
1051
1052 /*
1053 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
1054 * sleep)
1055 * - called from dput() when d_count is going to 0.
1056 * - return 1 to request dentry be unhashed, 0 otherwise
1057 */
1058 static int afs_d_delete(const struct dentry *dentry)
1059 {
1060 _enter("%pd", dentry);
1061
1062 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1063 goto zap;
1064
1065 if (d_really_is_positive(dentry) &&
1066 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
1067 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
1068 goto zap;
1069
1070 _leave(" = 0 [keep]");
1071 return 0;
1072
1073 zap:
1074 _leave(" = 1 [zap]");
1075 return 1;
1076 }
1077
1078 /*
1079 * handle dentry release
1080 */
1081 void afs_d_release(struct dentry *dentry)
1082 {
1083 _enter("%pd", dentry);
1084 }
1085
1086 /*
1087 * Create a new inode for create/mkdir/symlink
1088 */
1089 static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
1090 struct dentry *new_dentry,
1091 struct afs_fid *newfid,
1092 struct afs_file_status *newstatus,
1093 struct afs_callback *newcb)
1094 {
1095 struct afs_vnode *vnode;
1096 struct inode *inode;
1097
1098 if (fc->ac.error < 0)
1099 return;
1100
1101 d_drop(new_dentry);
1102
1103 inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
1104 newfid, newstatus, newcb, fc->cbi);
1105 if (IS_ERR(inode)) {
1106 /* ENOMEM or EINTR at a really inconvenient time - just abandon
1107 * the new directory on the server.
1108 */
1109 fc->ac.error = PTR_ERR(inode);
1110 return;
1111 }
1112
1113 vnode = AFS_FS_I(inode);
1114 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
1115 d_add(new_dentry, inode);
1116 }
1117
1118 /*
1119 * create a directory on an AFS filesystem
1120 */
1121 static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1122 {
1123 struct afs_file_status newstatus;
1124 struct afs_fs_cursor fc;
1125 struct afs_callback newcb;
1126 struct afs_vnode *dvnode = AFS_FS_I(dir);
1127 struct afs_fid newfid;
1128 struct key *key;
1129 u64 data_version = dvnode->status.data_version;
1130 int ret;
1131
1132 mode |= S_IFDIR;
1133
1134 _enter("{%x:%u},{%pd},%ho",
1135 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1136
1137 key = afs_request_key(dvnode->volume->cell);
1138 if (IS_ERR(key)) {
1139 ret = PTR_ERR(key);
1140 goto error;
1141 }
1142
1143 ret = -ERESTARTSYS;
1144 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1145 while (afs_select_fileserver(&fc)) {
1146 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
1147 afs_fs_create(&fc, dentry->d_name.name, mode, data_version,
1148 &newfid, &newstatus, &newcb);
1149 }
1150
1151 afs_check_for_remote_deletion(&fc, fc.vnode);
1152 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1153 afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
1154 ret = afs_end_vnode_operation(&fc);
1155 if (ret < 0)
1156 goto error_key;
1157 } else {
1158 goto error_key;
1159 }
1160
1161 if (ret == 0 &&
1162 test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1163 afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
1164 afs_edit_dir_for_create);
1165
1166 key_put(key);
1167 _leave(" = 0");
1168 return 0;
1169
1170 error_key:
1171 key_put(key);
1172 error:
1173 d_drop(dentry);
1174 _leave(" = %d", ret);
1175 return ret;
1176 }
1177
1178 /*
1179 * Remove a subdir from a directory.
1180 */
1181 static void afs_dir_remove_subdir(struct dentry *dentry)
1182 {
1183 if (d_really_is_positive(dentry)) {
1184 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1185
1186 clear_nlink(&vnode->vfs_inode);
1187 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1188 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1189 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
1190 }
1191 }
1192
1193 /*
1194 * remove a directory from an AFS filesystem
1195 */
1196 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
1197 {
1198 struct afs_fs_cursor fc;
1199 struct afs_vnode *dvnode = AFS_FS_I(dir);
1200 struct key *key;
1201 u64 data_version = dvnode->status.data_version;
1202 int ret;
1203
1204 _enter("{%x:%u},{%pd}",
1205 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1206
1207 key = afs_request_key(dvnode->volume->cell);
1208 if (IS_ERR(key)) {
1209 ret = PTR_ERR(key);
1210 goto error;
1211 }
1212
1213 ret = -ERESTARTSYS;
1214 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1215 while (afs_select_fileserver(&fc)) {
1216 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
1217 afs_fs_remove(&fc, dentry->d_name.name, true,
1218 data_version);
1219 }
1220
1221 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1222 ret = afs_end_vnode_operation(&fc);
1223 if (ret == 0) {
1224 afs_dir_remove_subdir(dentry);
1225 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1226 afs_edit_dir_remove(dvnode, &dentry->d_name,
1227 afs_edit_dir_for_rmdir);
1228 }
1229 }
1230
1231 key_put(key);
1232 error:
1233 return ret;
1234 }
1235
1236 /*
1237 * Remove a link to a file or symlink from a directory.
1238 *
1239 * If the file was not deleted due to excess hard links, the fileserver will
1240 * break the callback promise on the file - if it had one - before it returns
1241 * to us, and if it was deleted, it won't
1242 *
1243 * However, if we didn't have a callback promise outstanding, or it was
1244 * outstanding on a different server, then it won't break it either...
1245 */
1246 static int afs_dir_remove_link(struct dentry *dentry, struct key *key,
1247 unsigned long d_version_before,
1248 unsigned long d_version_after)
1249 {
1250 bool dir_valid;
1251 int ret = 0;
1252
1253 /* There were no intervening changes on the server if the version
1254 * number we got back was incremented by exactly 1.
1255 */
1256 dir_valid = (d_version_after == d_version_before + 1);
1257
1258 if (d_really_is_positive(dentry)) {
1259 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
1260
1261 if (dir_valid) {
1262 drop_nlink(&vnode->vfs_inode);
1263 if (vnode->vfs_inode.i_nlink == 0) {
1264 set_bit(AFS_VNODE_DELETED, &vnode->flags);
1265 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1266 }
1267 ret = 0;
1268 } else {
1269 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
1270
1271 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
1272 kdebug("AFS_VNODE_DELETED");
1273
1274 ret = afs_validate(vnode, key);
1275 if (ret == -ESTALE)
1276 ret = 0;
1277 }
1278 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
1279 }
1280
1281 return ret;
1282 }
1283
1284 /*
1285 * Remove a file or symlink from an AFS filesystem.
1286 */
1287 static int afs_unlink(struct inode *dir, struct dentry *dentry)
1288 {
1289 struct afs_fs_cursor fc;
1290 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
1291 struct key *key;
1292 unsigned long d_version = (unsigned long)dentry->d_fsdata;
1293 u64 data_version = dvnode->status.data_version;
1294 int ret;
1295
1296 _enter("{%x:%u},{%pd}",
1297 dvnode->fid.vid, dvnode->fid.vnode, dentry);
1298
1299 if (dentry->d_name.len >= AFSNAMEMAX)
1300 return -ENAMETOOLONG;
1301
1302 key = afs_request_key(dvnode->volume->cell);
1303 if (IS_ERR(key)) {
1304 ret = PTR_ERR(key);
1305 goto error;
1306 }
1307
1308 /* Try to make sure we have a callback promise on the victim. */
1309 if (d_really_is_positive(dentry)) {
1310 vnode = AFS_FS_I(d_inode(dentry));
1311 ret = afs_validate(vnode, key);
1312 if (ret < 0)
1313 goto error_key;
1314 }
1315
1316 ret = -ERESTARTSYS;
1317 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1318 while (afs_select_fileserver(&fc)) {
1319 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
1320 afs_fs_remove(&fc, dentry->d_name.name, false,
1321 data_version);
1322 }
1323
1324 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1325 ret = afs_end_vnode_operation(&fc);
1326 if (ret == 0)
1327 ret = afs_dir_remove_link(
1328 dentry, key, d_version,
1329 (unsigned long)dvnode->status.data_version);
1330 if (ret == 0 &&
1331 test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1332 afs_edit_dir_remove(dvnode, &dentry->d_name,
1333 afs_edit_dir_for_unlink);
1334 }
1335
1336 error_key:
1337 key_put(key);
1338 error:
1339 _leave(" = %d", ret);
1340 return ret;
1341 }
1342
1343 /*
1344 * create a regular file on an AFS filesystem
1345 */
1346 static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
1347 bool excl)
1348 {
1349 struct afs_fs_cursor fc;
1350 struct afs_file_status newstatus;
1351 struct afs_callback newcb;
1352 struct afs_vnode *dvnode = AFS_FS_I(dir);
1353 struct afs_fid newfid;
1354 struct key *key;
1355 u64 data_version = dvnode->status.data_version;
1356 int ret;
1357
1358 mode |= S_IFREG;
1359
1360 _enter("{%x:%u},{%pd},%ho,",
1361 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
1362
1363 ret = -ENAMETOOLONG;
1364 if (dentry->d_name.len >= AFSNAMEMAX)
1365 goto error;
1366
1367 key = afs_request_key(dvnode->volume->cell);
1368 if (IS_ERR(key)) {
1369 ret = PTR_ERR(key);
1370 goto error;
1371 }
1372
1373 ret = -ERESTARTSYS;
1374 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1375 while (afs_select_fileserver(&fc)) {
1376 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
1377 afs_fs_create(&fc, dentry->d_name.name, mode, data_version,
1378 &newfid, &newstatus, &newcb);
1379 }
1380
1381 afs_check_for_remote_deletion(&fc, fc.vnode);
1382 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1383 afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
1384 ret = afs_end_vnode_operation(&fc);
1385 if (ret < 0)
1386 goto error_key;
1387 } else {
1388 goto error_key;
1389 }
1390
1391 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1392 afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
1393 afs_edit_dir_for_create);
1394
1395 key_put(key);
1396 _leave(" = 0");
1397 return 0;
1398
1399 error_key:
1400 key_put(key);
1401 error:
1402 d_drop(dentry);
1403 _leave(" = %d", ret);
1404 return ret;
1405 }
1406
1407 /*
1408 * create a hard link between files in an AFS filesystem
1409 */
1410 static int afs_link(struct dentry *from, struct inode *dir,
1411 struct dentry *dentry)
1412 {
1413 struct afs_fs_cursor fc;
1414 struct afs_vnode *dvnode, *vnode;
1415 struct key *key;
1416 u64 data_version;
1417 int ret;
1418
1419 vnode = AFS_FS_I(d_inode(from));
1420 dvnode = AFS_FS_I(dir);
1421 data_version = dvnode->status.data_version;
1422
1423 _enter("{%x:%u},{%x:%u},{%pd}",
1424 vnode->fid.vid, vnode->fid.vnode,
1425 dvnode->fid.vid, dvnode->fid.vnode,
1426 dentry);
1427
1428 ret = -ENAMETOOLONG;
1429 if (dentry->d_name.len >= AFSNAMEMAX)
1430 goto error;
1431
1432 key = afs_request_key(dvnode->volume->cell);
1433 if (IS_ERR(key)) {
1434 ret = PTR_ERR(key);
1435 goto error;
1436 }
1437
1438 ret = -ERESTARTSYS;
1439 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1440 if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
1441 afs_end_vnode_operation(&fc);
1442 goto error_key;
1443 }
1444
1445 while (afs_select_fileserver(&fc)) {
1446 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
1447 fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break;
1448 afs_fs_link(&fc, vnode, dentry->d_name.name, data_version);
1449 }
1450
1451 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1452 afs_vnode_commit_status(&fc, vnode, fc.cb_break_2);
1453 ihold(&vnode->vfs_inode);
1454 d_instantiate(dentry, &vnode->vfs_inode);
1455
1456 mutex_unlock(&vnode->io_lock);
1457 ret = afs_end_vnode_operation(&fc);
1458 if (ret < 0)
1459 goto error_key;
1460 } else {
1461 goto error_key;
1462 }
1463
1464 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1465 afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid,
1466 afs_edit_dir_for_link);
1467
1468 key_put(key);
1469 _leave(" = 0");
1470 return 0;
1471
1472 error_key:
1473 key_put(key);
1474 error:
1475 d_drop(dentry);
1476 _leave(" = %d", ret);
1477 return ret;
1478 }
1479
1480 /*
1481 * create a symlink in an AFS filesystem
1482 */
1483 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1484 const char *content)
1485 {
1486 struct afs_fs_cursor fc;
1487 struct afs_file_status newstatus;
1488 struct afs_vnode *dvnode = AFS_FS_I(dir);
1489 struct afs_fid newfid;
1490 struct key *key;
1491 u64 data_version = dvnode->status.data_version;
1492 int ret;
1493
1494 _enter("{%x:%u},{%pd},%s",
1495 dvnode->fid.vid, dvnode->fid.vnode, dentry,
1496 content);
1497
1498 ret = -ENAMETOOLONG;
1499 if (dentry->d_name.len >= AFSNAMEMAX)
1500 goto error;
1501
1502 ret = -EINVAL;
1503 if (strlen(content) >= AFSPATHMAX)
1504 goto error;
1505
1506 key = afs_request_key(dvnode->volume->cell);
1507 if (IS_ERR(key)) {
1508 ret = PTR_ERR(key);
1509 goto error;
1510 }
1511
1512 ret = -ERESTARTSYS;
1513 if (afs_begin_vnode_operation(&fc, dvnode, key)) {
1514 while (afs_select_fileserver(&fc)) {
1515 fc.cb_break = dvnode->cb_break + dvnode->cb_s_break;
1516 afs_fs_symlink(&fc, dentry->d_name.name,
1517 content, data_version,
1518 &newfid, &newstatus);
1519 }
1520
1521 afs_check_for_remote_deletion(&fc, fc.vnode);
1522 afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
1523 afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL);
1524 ret = afs_end_vnode_operation(&fc);
1525 if (ret < 0)
1526 goto error_key;
1527 } else {
1528 goto error_key;
1529 }
1530
1531 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1532 afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
1533 afs_edit_dir_for_symlink);
1534
1535 key_put(key);
1536 _leave(" = 0");
1537 return 0;
1538
1539 error_key:
1540 key_put(key);
1541 error:
1542 d_drop(dentry);
1543 _leave(" = %d", ret);
1544 return ret;
1545 }
1546
1547 /*
1548 * rename a file in an AFS filesystem and/or move it between directories
1549 */
1550 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1551 struct inode *new_dir, struct dentry *new_dentry,
1552 unsigned int flags)
1553 {
1554 struct afs_fs_cursor fc;
1555 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1556 struct key *key;
1557 u64 orig_data_version, new_data_version;
1558 bool new_negative = d_is_negative(new_dentry);
1559 int ret;
1560
1561 if (flags)
1562 return -EINVAL;
1563
1564 vnode = AFS_FS_I(d_inode(old_dentry));
1565 orig_dvnode = AFS_FS_I(old_dir);
1566 new_dvnode = AFS_FS_I(new_dir);
1567 orig_data_version = orig_dvnode->status.data_version;
1568 new_data_version = new_dvnode->status.data_version;
1569
1570 _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}",
1571 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1572 vnode->fid.vid, vnode->fid.vnode,
1573 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1574 new_dentry);
1575
1576 key = afs_request_key(orig_dvnode->volume->cell);
1577 if (IS_ERR(key)) {
1578 ret = PTR_ERR(key);
1579 goto error;
1580 }
1581
1582 ret = -ERESTARTSYS;
1583 if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) {
1584 if (orig_dvnode != new_dvnode) {
1585 if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
1586 afs_end_vnode_operation(&fc);
1587 goto error_key;
1588 }
1589 }
1590 while (afs_select_fileserver(&fc)) {
1591 fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break;
1592 fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break;
1593 afs_fs_rename(&fc, old_dentry->d_name.name,
1594 new_dvnode, new_dentry->d_name.name,
1595 orig_data_version, new_data_version);
1596 }
1597
1598 afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break);
1599 afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2);
1600 if (orig_dvnode != new_dvnode)
1601 mutex_unlock(&new_dvnode->io_lock);
1602 ret = afs_end_vnode_operation(&fc);
1603 if (ret < 0)
1604 goto error_key;
1605 }
1606
1607 if (ret == 0) {
1608 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags))
1609 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
1610 afs_edit_dir_for_rename);
1611
1612 if (!new_negative &&
1613 test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
1614 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
1615 afs_edit_dir_for_rename);
1616
1617 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
1618 afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
1619 &vnode->fid, afs_edit_dir_for_rename);
1620 }
1621
1622 error_key:
1623 key_put(key);
1624 error:
1625 _leave(" = %d", ret);
1626 return ret;
1627 }
1628
1629 /*
1630 * Release a directory page and clean up its private state if it's not busy
1631 * - return true if the page can now be released, false if not
1632 */
1633 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
1634 {
1635 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1636
1637 _enter("{{%x:%u}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
1638
1639 set_page_private(page, 0);
1640 ClearPagePrivate(page);
1641
1642 /* The directory will need reloading. */
1643 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1644 afs_stat_v(dvnode, n_relpg);
1645 return 1;
1646 }
1647
1648 /*
1649 * invalidate part or all of a page
1650 * - release a page and clean up its private data if offset is 0 (indicating
1651 * the entire page)
1652 */
1653 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
1654 unsigned int length)
1655 {
1656 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
1657
1658 _enter("{%lu},%u,%u", page->index, offset, length);
1659
1660 BUG_ON(!PageLocked(page));
1661
1662 /* The directory will need reloading. */
1663 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
1664 afs_stat_v(dvnode, n_inval);
1665
1666 /* we clean up only if the entire page is being invalidated */
1667 if (offset == 0 && length == PAGE_SIZE) {
1668 set_page_private(page, 0);
1669 ClearPagePrivate(page);
1670 }
1671 }
Linux with added FPC-III support