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ALSA: oxygen: add self-documenting functions
[firewire-audio.git] / fs / afs / dir.c
blobdfda03d4397d03862ae9b64d0832d4d9463010c5
1 /* dir.c: AFS filesystem directory handling
2 *
3 * Copyright (C) 2002 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/module.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/fs.h>
17 #include <linux/pagemap.h>
18 #include <linux/ctype.h>
19 #include <linux/sched.h>
20 #include "internal.h"
21
22 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
23 struct nameidata *nd);
24 static int afs_dir_open(struct inode *inode, struct file *file);
25 static int afs_readdir(struct file *file, void *dirent, filldir_t filldir);
26 static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd);
27 static int afs_d_delete(struct dentry *dentry);
28 static void afs_d_release(struct dentry *dentry);
29 static int afs_lookup_filldir(void *_cookie, const char *name, int nlen,
30 loff_t fpos, u64 ino, unsigned dtype);
31 static int afs_create(struct inode *dir, struct dentry *dentry, int mode,
32 struct nameidata *nd);
33 static int afs_mkdir(struct inode *dir, struct dentry *dentry, int 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
43 const struct file_operations afs_dir_file_operations = {
44 .open = afs_dir_open,
45 .release = afs_release,
46 .readdir = afs_readdir,
47 .lock = afs_lock,
48 };
49
50 const struct inode_operations afs_dir_inode_operations = {
51 .create = afs_create,
52 .lookup = afs_lookup,
53 .link = afs_link,
54 .unlink = afs_unlink,
55 .symlink = afs_symlink,
56 .mkdir = afs_mkdir,
57 .rmdir = afs_rmdir,
58 .rename = afs_rename,
59 .permission = afs_permission,
60 .getattr = afs_getattr,
61 .setattr = afs_setattr,
62 };
63
64 static struct dentry_operations afs_fs_dentry_operations = {
65 .d_revalidate = afs_d_revalidate,
66 .d_delete = afs_d_delete,
67 .d_release = afs_d_release,
68 };
69
70 #define AFS_DIR_HASHTBL_SIZE 128
71 #define AFS_DIR_DIRENT_SIZE 32
72 #define AFS_DIRENT_PER_BLOCK 64
73
74 union afs_dirent {
75 struct {
76 uint8_t valid;
77 uint8_t unused[1];
78 __be16 hash_next;
79 __be32 vnode;
80 __be32 unique;
81 uint8_t name[16];
82 uint8_t overflow[4]; /* if any char of the name (inc
83 * NUL) reaches here, consume
84 * the next dirent too */
85 } u;
86 uint8_t extended_name[32];
87 };
88
89 /* AFS directory page header (one at the beginning of every 2048-byte chunk) */
90 struct afs_dir_pagehdr {
91 __be16 npages;
92 __be16 magic;
93 #define AFS_DIR_MAGIC htons(1234)
94 uint8_t nentries;
95 uint8_t bitmap[8];
96 uint8_t pad[19];
97 };
98
99 /* directory block layout */
100 union afs_dir_block {
101
102 struct afs_dir_pagehdr pagehdr;
103
104 struct {
105 struct afs_dir_pagehdr pagehdr;
106 uint8_t alloc_ctrs[128];
107 /* dir hash table */
108 uint16_t hashtable[AFS_DIR_HASHTBL_SIZE];
109 } hdr;
110
111 union afs_dirent dirents[AFS_DIRENT_PER_BLOCK];
112 };
113
114 /* layout on a linux VM page */
115 struct afs_dir_page {
116 union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
117 };
118
119 struct afs_lookup_cookie {
120 struct afs_fid fid;
121 const char *name;
122 size_t nlen;
123 int found;
124 };
125
126 /*
127 * check that a directory page is valid
128 */
129 static inline void afs_dir_check_page(struct inode *dir, struct page *page)
130 {
131 struct afs_dir_page *dbuf;
132 loff_t latter;
133 int tmp, qty;
134
135 #if 0
136 /* check the page count */
137 qty = desc.size / sizeof(dbuf->blocks[0]);
138 if (qty == 0)
139 goto error;
140
141 if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) {
142 printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
143 __func__, dir->i_ino, qty,
144 ntohs(dbuf->blocks[0].pagehdr.npages));
145 goto error;
146 }
147 #endif
148
149 /* determine how many magic numbers there should be in this page */
150 latter = dir->i_size - page_offset(page);
151 if (latter >= PAGE_SIZE)
152 qty = PAGE_SIZE;
153 else
154 qty = latter;
155 qty /= sizeof(union afs_dir_block);
156
157 /* check them */
158 dbuf = page_address(page);
159 for (tmp = 0; tmp < qty; tmp++) {
160 if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) {
161 printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n",
162 __func__, dir->i_ino, tmp, qty,
163 ntohs(dbuf->blocks[tmp].pagehdr.magic));
164 goto error;
165 }
166 }
167
168 SetPageChecked(page);
169 return;
170
171 error:
172 SetPageChecked(page);
173 SetPageError(page);
174 }
175
176 /*
177 * discard a page cached in the pagecache
178 */
179 static inline void afs_dir_put_page(struct page *page)
180 {
181 kunmap(page);
182 page_cache_release(page);
183 }
184
185 /*
186 * get a page into the pagecache
187 */
188 static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
189 struct key *key)
190 {
191 struct page *page;
192 struct file file = {
193 .private_data = key,
194 };
195
196 _enter("{%lu},%lu", dir->i_ino, index);
197
198 page = read_mapping_page(dir->i_mapping, index, &file);
199 if (!IS_ERR(page)) {
200 kmap(page);
201 if (!PageChecked(page))
202 afs_dir_check_page(dir, page);
203 if (PageError(page))
204 goto fail;
205 }
206 return page;
207
208 fail:
209 afs_dir_put_page(page);
210 _leave(" = -EIO");
211 return ERR_PTR(-EIO);
212 }
213
214 /*
215 * open an AFS directory file
216 */
217 static int afs_dir_open(struct inode *inode, struct file *file)
218 {
219 _enter("{%lu}", inode->i_ino);
220
221 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
222 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
223
224 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
225 return -ENOENT;
226
227 return afs_open(inode, file);
228 }
229
230 /*
231 * deal with one block in an AFS directory
232 */
233 static int afs_dir_iterate_block(unsigned *fpos,
234 union afs_dir_block *block,
235 unsigned blkoff,
236 void *cookie,
237 filldir_t filldir)
238 {
239 union afs_dirent *dire;
240 unsigned offset, next, curr;
241 size_t nlen;
242 int tmp, ret;
243
244 _enter("%u,%x,%p,,",*fpos,blkoff,block);
245
246 curr = (*fpos - blkoff) / sizeof(union afs_dirent);
247
248 /* walk through the block, an entry at a time */
249 for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
250 offset < AFS_DIRENT_PER_BLOCK;
251 offset = next
252 ) {
253 next = offset + 1;
254
255 /* skip entries marked unused in the bitmap */
256 if (!(block->pagehdr.bitmap[offset / 8] &
257 (1 << (offset % 8)))) {
258 _debug("ENT[%Zu.%u]: unused",
259 blkoff / sizeof(union afs_dir_block), offset);
260 if (offset >= curr)
261 *fpos = blkoff +
262 next * sizeof(union afs_dirent);
263 continue;
264 }
265
266 /* got a valid entry */
267 dire = &block->dirents[offset];
268 nlen = strnlen(dire->u.name,
269 sizeof(*block) -
270 offset * sizeof(union afs_dirent));
271
272 _debug("ENT[%Zu.%u]: %s %Zu \"%s\"",
273 blkoff / sizeof(union afs_dir_block), offset,
274 (offset < curr ? "skip" : "fill"),
275 nlen, dire->u.name);
276
277 /* work out where the next possible entry is */
278 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) {
279 if (next >= AFS_DIRENT_PER_BLOCK) {
280 _debug("ENT[%Zu.%u]:"
281 " %u travelled beyond end dir block"
282 " (len %u/%Zu)",
283 blkoff / sizeof(union afs_dir_block),
284 offset, next, tmp, nlen);
285 return -EIO;
286 }
287 if (!(block->pagehdr.bitmap[next / 8] &
288 (1 << (next % 8)))) {
289 _debug("ENT[%Zu.%u]:"
290 " %u unmarked extension (len %u/%Zu)",
291 blkoff / sizeof(union afs_dir_block),
292 offset, next, tmp, nlen);
293 return -EIO;
294 }
295
296 _debug("ENT[%Zu.%u]: ext %u/%Zu",
297 blkoff / sizeof(union afs_dir_block),
298 next, tmp, nlen);
299 next++;
300 }
301
302 /* skip if starts before the current position */
303 if (offset < curr)
304 continue;
305
306 /* found the next entry */
307 ret = filldir(cookie,
308 dire->u.name,
309 nlen,
310 blkoff + offset * sizeof(union afs_dirent),
311 ntohl(dire->u.vnode),
312 filldir == afs_lookup_filldir ?
313 ntohl(dire->u.unique) : DT_UNKNOWN);
314 if (ret < 0) {
315 _leave(" = 0 [full]");
316 return 0;
317 }
318
319 *fpos = blkoff + next * sizeof(union afs_dirent);
320 }
321
322 _leave(" = 1 [more]");
323 return 1;
324 }
325
326 /*
327 * iterate through the data blob that lists the contents of an AFS directory
328 */
329 static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie,
330 filldir_t filldir, struct key *key)
331 {
332 union afs_dir_block *dblock;
333 struct afs_dir_page *dbuf;
334 struct page *page;
335 unsigned blkoff, limit;
336 int ret;
337
338 _enter("{%lu},%u,,", dir->i_ino, *fpos);
339
340 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
341 _leave(" = -ESTALE");
342 return -ESTALE;
343 }
344
345 /* round the file position up to the next entry boundary */
346 *fpos += sizeof(union afs_dirent) - 1;
347 *fpos &= ~(sizeof(union afs_dirent) - 1);
348
349 /* walk through the blocks in sequence */
350 ret = 0;
351 while (*fpos < dir->i_size) {
352 blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1);
353
354 /* fetch the appropriate page from the directory */
355 page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key);
356 if (IS_ERR(page)) {
357 ret = PTR_ERR(page);
358 break;
359 }
360
361 limit = blkoff & ~(PAGE_SIZE - 1);
362
363 dbuf = page_address(page);
364
365 /* deal with the individual blocks stashed on this page */
366 do {
367 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
368 sizeof(union afs_dir_block)];
369 ret = afs_dir_iterate_block(fpos, dblock, blkoff,
370 cookie, filldir);
371 if (ret != 1) {
372 afs_dir_put_page(page);
373 goto out;
374 }
375
376 blkoff += sizeof(union afs_dir_block);
377
378 } while (*fpos < dir->i_size && blkoff < limit);
379
380 afs_dir_put_page(page);
381 ret = 0;
382 }
383
384 out:
385 _leave(" = %d", ret);
386 return ret;
387 }
388
389 /*
390 * read an AFS directory
391 */
392 static int afs_readdir(struct file *file, void *cookie, filldir_t filldir)
393 {
394 unsigned fpos;
395 int ret;
396
397 _enter("{%Ld,{%lu}}",
398 file->f_pos, file->f_path.dentry->d_inode->i_ino);
399
400 ASSERT(file->private_data != NULL);
401
402 fpos = file->f_pos;
403 ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos,
404 cookie, filldir, file->private_data);
405 file->f_pos = fpos;
406
407 _leave(" = %d", ret);
408 return ret;
409 }
410
411 /*
412 * search the directory for a name
413 * - if afs_dir_iterate_block() spots this function, it'll pass the FID
414 * uniquifier through dtype
415 */
416 static int afs_lookup_filldir(void *_cookie, const char *name, int nlen,
417 loff_t fpos, u64 ino, unsigned dtype)
418 {
419 struct afs_lookup_cookie *cookie = _cookie;
420
421 _enter("{%s,%Zu},%s,%u,,%llu,%u",
422 cookie->name, cookie->nlen, name, nlen,
423 (unsigned long long) ino, dtype);
424
425 /* insanity checks first */
426 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
427 BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
428
429 if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) {
430 _leave(" = 0 [no]");
431 return 0;
432 }
433
434 cookie->fid.vnode = ino;
435 cookie->fid.unique = dtype;
436 cookie->found = 1;
437
438 _leave(" = -1 [found]");
439 return -1;
440 }
441
442 /*
443 * do a lookup in a directory
444 * - just returns the FID the dentry name maps to if found
445 */
446 static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
447 struct afs_fid *fid, struct key *key)
448 {
449 struct afs_lookup_cookie cookie;
450 struct afs_super_info *as;
451 unsigned fpos;
452 int ret;
453
454 _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name);
455
456 as = dir->i_sb->s_fs_info;
457
458 /* search the directory */
459 cookie.name = dentry->d_name.name;
460 cookie.nlen = dentry->d_name.len;
461 cookie.fid.vid = as->volume->vid;
462 cookie.found = 0;
463
464 fpos = 0;
465 ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir,
466 key);
467 if (ret < 0) {
468 _leave(" = %d [iter]", ret);
469 return ret;
470 }
471
472 ret = -ENOENT;
473 if (!cookie.found) {
474 _leave(" = -ENOENT [not found]");
475 return -ENOENT;
476 }
477
478 *fid = cookie.fid;
479 _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
480 return 0;
481 }
482
483 /*
484 * look up an entry in a directory
485 */
486 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
487 struct nameidata *nd)
488 {
489 struct afs_vnode *vnode;
490 struct afs_fid fid;
491 struct inode *inode;
492 struct key *key;
493 int ret;
494
495 vnode = AFS_FS_I(dir);
496
497 _enter("{%x:%u},%p{%s},",
498 vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name);
499
500 ASSERTCMP(dentry->d_inode, ==, NULL);
501
502 if (dentry->d_name.len >= AFSNAMEMAX) {
503 _leave(" = -ENAMETOOLONG");
504 return ERR_PTR(-ENAMETOOLONG);
505 }
506
507 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
508 _leave(" = -ESTALE");
509 return ERR_PTR(-ESTALE);
510 }
511
512 key = afs_request_key(vnode->volume->cell);
513 if (IS_ERR(key)) {
514 _leave(" = %ld [key]", PTR_ERR(key));
515 return ERR_CAST(key);
516 }
517
518 ret = afs_validate(vnode, key);
519 if (ret < 0) {
520 key_put(key);
521 _leave(" = %d [val]", ret);
522 return ERR_PTR(ret);
523 }
524
525 ret = afs_do_lookup(dir, dentry, &fid, key);
526 if (ret < 0) {
527 key_put(key);
528 if (ret == -ENOENT) {
529 d_add(dentry, NULL);
530 _leave(" = NULL [negative]");
531 return NULL;
532 }
533 _leave(" = %d [do]", ret);
534 return ERR_PTR(ret);
535 }
536 dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
537
538 /* instantiate the dentry */
539 inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL);
540 key_put(key);
541 if (IS_ERR(inode)) {
542 _leave(" = %ld", PTR_ERR(inode));
543 return ERR_CAST(inode);
544 }
545
546 dentry->d_op = &afs_fs_dentry_operations;
547
548 d_add(dentry, inode);
549 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }",
550 fid.vnode,
551 fid.unique,
552 dentry->d_inode->i_ino,
553 (unsigned long long)dentry->d_inode->i_version);
554
555 return NULL;
556 }
557
558 /*
559 * check that a dentry lookup hit has found a valid entry
560 * - NOTE! the hit can be a negative hit too, so we can't assume we have an
561 * inode
562 */
563 static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
564 {
565 struct afs_vnode *vnode, *dir;
566 struct afs_fid fid;
567 struct dentry *parent;
568 struct key *key;
569 void *dir_version;
570 int ret;
571
572 vnode = AFS_FS_I(dentry->d_inode);
573
574 if (dentry->d_inode)
575 _enter("{v={%x:%u} n=%s fl=%lx},",
576 vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
577 vnode->flags);
578 else
579 _enter("{neg n=%s}", dentry->d_name.name);
580
581 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
582 if (IS_ERR(key))
583 key = NULL;
584
585 /* lock down the parent dentry so we can peer at it */
586 parent = dget_parent(dentry);
587 if (!parent->d_inode)
588 goto out_bad;
589
590 dir = AFS_FS_I(parent->d_inode);
591
592 /* validate the parent directory */
593 if (test_bit(AFS_VNODE_MODIFIED, &dir->flags))
594 afs_validate(dir, key);
595
596 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
597 _debug("%s: parent dir deleted", dentry->d_name.name);
598 goto out_bad;
599 }
600
601 dir_version = (void *) (unsigned long) dir->status.data_version;
602 if (dentry->d_fsdata == dir_version)
603 goto out_valid; /* the dir contents are unchanged */
604
605 _debug("dir modified");
606
607 /* search the directory for this vnode */
608 ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
609 switch (ret) {
610 case 0:
611 /* the filename maps to something */
612 if (!dentry->d_inode)
613 goto out_bad;
614 if (is_bad_inode(dentry->d_inode)) {
615 printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
616 parent->d_name.name, dentry->d_name.name);
617 goto out_bad;
618 }
619
620 /* if the vnode ID has changed, then the dirent points to a
621 * different file */
622 if (fid.vnode != vnode->fid.vnode) {
623 _debug("%s: dirent changed [%u != %u]",
624 dentry->d_name.name, fid.vnode,
625 vnode->fid.vnode);
626 goto not_found;
627 }
628
629 /* if the vnode ID uniqifier has changed, then the file has
630 * been deleted and replaced, and the original vnode ID has
631 * been reused */
632 if (fid.unique != vnode->fid.unique) {
633 _debug("%s: file deleted (uq %u -> %u I:%llu)",
634 dentry->d_name.name, fid.unique,
635 vnode->fid.unique,
636 (unsigned long long)dentry->d_inode->i_version);
637 spin_lock(&vnode->lock);
638 set_bit(AFS_VNODE_DELETED, &vnode->flags);
639 spin_unlock(&vnode->lock);
640 goto not_found;
641 }
642 goto out_valid;
643
644 case -ENOENT:
645 /* the filename is unknown */
646 _debug("%s: dirent not found", dentry->d_name.name);
647 if (dentry->d_inode)
648 goto not_found;
649 goto out_valid;
650
651 default:
652 _debug("failed to iterate dir %s: %d",
653 parent->d_name.name, ret);
654 goto out_bad;
655 }
656
657 out_valid:
658 dentry->d_fsdata = dir_version;
659 out_skip:
660 dput(parent);
661 key_put(key);
662 _leave(" = 1 [valid]");
663 return 1;
664
665 /* the dirent, if it exists, now points to a different vnode */
666 not_found:
667 spin_lock(&dentry->d_lock);
668 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
669 spin_unlock(&dentry->d_lock);
670
671 out_bad:
672 if (dentry->d_inode) {
673 /* don't unhash if we have submounts */
674 if (have_submounts(dentry))
675 goto out_skip;
676 }
677
678 _debug("dropping dentry %s/%s",
679 parent->d_name.name, dentry->d_name.name);
680 shrink_dcache_parent(dentry);
681 d_drop(dentry);
682 dput(parent);
683 key_put(key);
684
685 _leave(" = 0 [bad]");
686 return 0;
687 }
688
689 /*
690 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
691 * sleep)
692 * - called from dput() when d_count is going to 0.
693 * - return 1 to request dentry be unhashed, 0 otherwise
694 */
695 static int afs_d_delete(struct dentry *dentry)
696 {
697 _enter("%s", dentry->d_name.name);
698
699 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
700 goto zap;
701
702 if (dentry->d_inode &&
703 test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags))
704 goto zap;
705
706 _leave(" = 0 [keep]");
707 return 0;
708
709 zap:
710 _leave(" = 1 [zap]");
711 return 1;
712 }
713
714 /*
715 * handle dentry release
716 */
717 static void afs_d_release(struct dentry *dentry)
718 {
719 _enter("%s", dentry->d_name.name);
720 }
721
722 /*
723 * create a directory on an AFS filesystem
724 */
725 static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
726 {
727 struct afs_file_status status;
728 struct afs_callback cb;
729 struct afs_server *server;
730 struct afs_vnode *dvnode, *vnode;
731 struct afs_fid fid;
732 struct inode *inode;
733 struct key *key;
734 int ret;
735
736 dvnode = AFS_FS_I(dir);
737
738 _enter("{%x:%u},{%s},%o",
739 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
740
741 ret = -ENAMETOOLONG;
742 if (dentry->d_name.len >= AFSNAMEMAX)
743 goto error;
744
745 key = afs_request_key(dvnode->volume->cell);
746 if (IS_ERR(key)) {
747 ret = PTR_ERR(key);
748 goto error;
749 }
750
751 mode |= S_IFDIR;
752 ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
753 mode, &fid, &status, &cb, &server);
754 if (ret < 0)
755 goto mkdir_error;
756
757 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
758 if (IS_ERR(inode)) {
759 /* ENOMEM at a really inconvenient time - just abandon the new
760 * directory on the server */
761 ret = PTR_ERR(inode);
762 goto iget_error;
763 }
764
765 /* apply the status report we've got for the new vnode */
766 vnode = AFS_FS_I(inode);
767 spin_lock(&vnode->lock);
768 vnode->update_cnt++;
769 spin_unlock(&vnode->lock);
770 afs_vnode_finalise_status_update(vnode, server);
771 afs_put_server(server);
772
773 d_instantiate(dentry, inode);
774 if (d_unhashed(dentry)) {
775 _debug("not hashed");
776 d_rehash(dentry);
777 }
778 key_put(key);
779 _leave(" = 0");
780 return 0;
781
782 iget_error:
783 afs_put_server(server);
784 mkdir_error:
785 key_put(key);
786 error:
787 d_drop(dentry);
788 _leave(" = %d", ret);
789 return ret;
790 }
791
792 /*
793 * remove a directory from an AFS filesystem
794 */
795 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
796 {
797 struct afs_vnode *dvnode, *vnode;
798 struct key *key;
799 int ret;
800
801 dvnode = AFS_FS_I(dir);
802
803 _enter("{%x:%u},{%s}",
804 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
805
806 ret = -ENAMETOOLONG;
807 if (dentry->d_name.len >= AFSNAMEMAX)
808 goto error;
809
810 key = afs_request_key(dvnode->volume->cell);
811 if (IS_ERR(key)) {
812 ret = PTR_ERR(key);
813 goto error;
814 }
815
816 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true);
817 if (ret < 0)
818 goto rmdir_error;
819
820 if (dentry->d_inode) {
821 vnode = AFS_FS_I(dentry->d_inode);
822 clear_nlink(&vnode->vfs_inode);
823 set_bit(AFS_VNODE_DELETED, &vnode->flags);
824 afs_discard_callback_on_delete(vnode);
825 }
826
827 key_put(key);
828 _leave(" = 0");
829 return 0;
830
831 rmdir_error:
832 key_put(key);
833 error:
834 _leave(" = %d", ret);
835 return ret;
836 }
837
838 /*
839 * remove a file from an AFS filesystem
840 */
841 static int afs_unlink(struct inode *dir, struct dentry *dentry)
842 {
843 struct afs_vnode *dvnode, *vnode;
844 struct key *key;
845 int ret;
846
847 dvnode = AFS_FS_I(dir);
848
849 _enter("{%x:%u},{%s}",
850 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
851
852 ret = -ENAMETOOLONG;
853 if (dentry->d_name.len >= AFSNAMEMAX)
854 goto error;
855
856 key = afs_request_key(dvnode->volume->cell);
857 if (IS_ERR(key)) {
858 ret = PTR_ERR(key);
859 goto error;
860 }
861
862 if (dentry->d_inode) {
863 vnode = AFS_FS_I(dentry->d_inode);
864
865 /* make sure we have a callback promise on the victim */
866 ret = afs_validate(vnode, key);
867 if (ret < 0)
868 goto error;
869 }
870
871 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false);
872 if (ret < 0)
873 goto remove_error;
874
875 if (dentry->d_inode) {
876 /* if the file wasn't deleted due to excess hard links, the
877 * fileserver will break the callback promise on the file - if
878 * it had one - before it returns to us, and if it was deleted,
879 * it won't
880 *
881 * however, if we didn't have a callback promise outstanding,
882 * or it was outstanding on a different server, then it won't
883 * break it either...
884 */
885 vnode = AFS_FS_I(dentry->d_inode);
886 if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
887 _debug("AFS_VNODE_DELETED");
888 if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
889 _debug("AFS_VNODE_CB_BROKEN");
890 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
891 ret = afs_validate(vnode, key);
892 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
893 }
894
895 key_put(key);
896 _leave(" = 0");
897 return 0;
898
899 remove_error:
900 key_put(key);
901 error:
902 _leave(" = %d", ret);
903 return ret;
904 }
905
906 /*
907 * create a regular file on an AFS filesystem
908 */
909 static int afs_create(struct inode *dir, struct dentry *dentry, int mode,
910 struct nameidata *nd)
911 {
912 struct afs_file_status status;
913 struct afs_callback cb;
914 struct afs_server *server;
915 struct afs_vnode *dvnode, *vnode;
916 struct afs_fid fid;
917 struct inode *inode;
918 struct key *key;
919 int ret;
920
921 dvnode = AFS_FS_I(dir);
922
923 _enter("{%x:%u},{%s},%o,",
924 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
925
926 ret = -ENAMETOOLONG;
927 if (dentry->d_name.len >= AFSNAMEMAX)
928 goto error;
929
930 key = afs_request_key(dvnode->volume->cell);
931 if (IS_ERR(key)) {
932 ret = PTR_ERR(key);
933 goto error;
934 }
935
936 mode |= S_IFREG;
937 ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
938 mode, &fid, &status, &cb, &server);
939 if (ret < 0)
940 goto create_error;
941
942 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
943 if (IS_ERR(inode)) {
944 /* ENOMEM at a really inconvenient time - just abandon the new
945 * directory on the server */
946 ret = PTR_ERR(inode);
947 goto iget_error;
948 }
949
950 /* apply the status report we've got for the new vnode */
951 vnode = AFS_FS_I(inode);
952 spin_lock(&vnode->lock);
953 vnode->update_cnt++;
954 spin_unlock(&vnode->lock);
955 afs_vnode_finalise_status_update(vnode, server);
956 afs_put_server(server);
957
958 d_instantiate(dentry, inode);
959 if (d_unhashed(dentry)) {
960 _debug("not hashed");
961 d_rehash(dentry);
962 }
963 key_put(key);
964 _leave(" = 0");
965 return 0;
966
967 iget_error:
968 afs_put_server(server);
969 create_error:
970 key_put(key);
971 error:
972 d_drop(dentry);
973 _leave(" = %d", ret);
974 return ret;
975 }
976
977 /*
978 * create a hard link between files in an AFS filesystem
979 */
980 static int afs_link(struct dentry *from, struct inode *dir,
981 struct dentry *dentry)
982 {
983 struct afs_vnode *dvnode, *vnode;
984 struct key *key;
985 int ret;
986
987 vnode = AFS_FS_I(from->d_inode);
988 dvnode = AFS_FS_I(dir);
989
990 _enter("{%x:%u},{%x:%u},{%s}",
991 vnode->fid.vid, vnode->fid.vnode,
992 dvnode->fid.vid, dvnode->fid.vnode,
993 dentry->d_name.name);
994
995 ret = -ENAMETOOLONG;
996 if (dentry->d_name.len >= AFSNAMEMAX)
997 goto error;
998
999 key = afs_request_key(dvnode->volume->cell);
1000 if (IS_ERR(key)) {
1001 ret = PTR_ERR(key);
1002 goto error;
1003 }
1004
1005 ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name);
1006 if (ret < 0)
1007 goto link_error;
1008
1009 atomic_inc(&vnode->vfs_inode.i_count);
1010 d_instantiate(dentry, &vnode->vfs_inode);
1011 key_put(key);
1012 _leave(" = 0");
1013 return 0;
1014
1015 link_error:
1016 key_put(key);
1017 error:
1018 d_drop(dentry);
1019 _leave(" = %d", ret);
1020 return ret;
1021 }
1022
1023 /*
1024 * create a symlink in an AFS filesystem
1025 */
1026 static int afs_symlink(struct inode *dir, struct dentry *dentry,
1027 const char *content)
1028 {
1029 struct afs_file_status status;
1030 struct afs_server *server;
1031 struct afs_vnode *dvnode, *vnode;
1032 struct afs_fid fid;
1033 struct inode *inode;
1034 struct key *key;
1035 int ret;
1036
1037 dvnode = AFS_FS_I(dir);
1038
1039 _enter("{%x:%u},{%s},%s",
1040 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name,
1041 content);
1042
1043 ret = -ENAMETOOLONG;
1044 if (dentry->d_name.len >= AFSNAMEMAX)
1045 goto error;
1046
1047 ret = -EINVAL;
1048 if (strlen(content) >= AFSPATHMAX)
1049 goto error;
1050
1051 key = afs_request_key(dvnode->volume->cell);
1052 if (IS_ERR(key)) {
1053 ret = PTR_ERR(key);
1054 goto error;
1055 }
1056
1057 ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content,
1058 &fid, &status, &server);
1059 if (ret < 0)
1060 goto create_error;
1061
1062 inode = afs_iget(dir->i_sb, key, &fid, &status, NULL);
1063 if (IS_ERR(inode)) {
1064 /* ENOMEM at a really inconvenient time - just abandon the new
1065 * directory on the server */
1066 ret = PTR_ERR(inode);
1067 goto iget_error;
1068 }
1069
1070 /* apply the status report we've got for the new vnode */
1071 vnode = AFS_FS_I(inode);
1072 spin_lock(&vnode->lock);
1073 vnode->update_cnt++;
1074 spin_unlock(&vnode->lock);
1075 afs_vnode_finalise_status_update(vnode, server);
1076 afs_put_server(server);
1077
1078 d_instantiate(dentry, inode);
1079 if (d_unhashed(dentry)) {
1080 _debug("not hashed");
1081 d_rehash(dentry);
1082 }
1083 key_put(key);
1084 _leave(" = 0");
1085 return 0;
1086
1087 iget_error:
1088 afs_put_server(server);
1089 create_error:
1090 key_put(key);
1091 error:
1092 d_drop(dentry);
1093 _leave(" = %d", ret);
1094 return ret;
1095 }
1096
1097 /*
1098 * rename a file in an AFS filesystem and/or move it between directories
1099 */
1100 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
1101 struct inode *new_dir, struct dentry *new_dentry)
1102 {
1103 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
1104 struct key *key;
1105 int ret;
1106
1107 vnode = AFS_FS_I(old_dentry->d_inode);
1108 orig_dvnode = AFS_FS_I(old_dir);
1109 new_dvnode = AFS_FS_I(new_dir);
1110
1111 _enter("{%x:%u},{%x:%u},{%x:%u},{%s}",
1112 orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
1113 vnode->fid.vid, vnode->fid.vnode,
1114 new_dvnode->fid.vid, new_dvnode->fid.vnode,
1115 new_dentry->d_name.name);
1116
1117 ret = -ENAMETOOLONG;
1118 if (new_dentry->d_name.len >= AFSNAMEMAX)
1119 goto error;
1120
1121 key = afs_request_key(orig_dvnode->volume->cell);
1122 if (IS_ERR(key)) {
1123 ret = PTR_ERR(key);
1124 goto error;
1125 }
1126
1127 ret = afs_vnode_rename(orig_dvnode, new_dvnode, key,
1128 old_dentry->d_name.name,
1129 new_dentry->d_name.name);
1130 if (ret < 0)
1131 goto rename_error;
1132 key_put(key);
1133 _leave(" = 0");
1134 return 0;
1135
1136 rename_error:
1137 key_put(key);
1138 error:
1139 d_drop(new_dentry);
1140 _leave(" = %d", ret);
1141 return ret;
1142 }
AMDTP streaming driver for the Linux FireWire stack (Juju)