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20#include <linux/module.h>
21#include <linux/time.h>
22#include <linux/errno.h>
23#include <linux/stat.h>
24#include <linux/fcntl.h>
25#include <linux/string.h>
26#include <linux/kernel.h>
27#include <linux/slab.h>
28#include <linux/mm.h>
29#include <linux/sunrpc/clnt.h>
30#include <linux/nfs_fs.h>
31#include <linux/nfs_mount.h>
32#include <linux/pagemap.h>
33#include <linux/pagevec.h>
34#include <linux/namei.h>
35#include <linux/mount.h>
36#include <linux/swap.h>
37#include <linux/sched.h>
38#include <linux/kmemleak.h>
39#include <linux/xattr.h>
40
41#include "delegation.h"
42#include "iostat.h"
43#include "internal.h"
44#include "fscache.h"
45
46
47
48static int nfs_opendir(struct inode *, struct file *);
49static int nfs_closedir(struct inode *, struct file *);
50static int nfs_readdir(struct file *, struct dir_context *);
51static int nfs_fsync_dir(struct file *, loff_t, loff_t, int);
52static loff_t nfs_llseek_dir(struct file *, loff_t, int);
53static void nfs_readdir_clear_array(struct page*);
54
55const struct file_operations nfs_dir_operations = {
56 .llseek = nfs_llseek_dir,
57 .read = generic_read_dir,
58 .iterate = nfs_readdir,
59 .open = nfs_opendir,
60 .release = nfs_closedir,
61 .fsync = nfs_fsync_dir,
62};
63
64const struct address_space_operations nfs_dir_aops = {
65 .freepage = nfs_readdir_clear_array,
66};
67
68static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, struct rpc_cred *cred)
69{
70 struct nfs_open_dir_context *ctx;
71 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
72 if (ctx != NULL) {
73 ctx->duped = 0;
74 ctx->attr_gencount = NFS_I(dir)->attr_gencount;
75 ctx->dir_cookie = 0;
76 ctx->dup_cookie = 0;
77 ctx->cred = get_rpccred(cred);
78 return ctx;
79 }
80 return ERR_PTR(-ENOMEM);
81}
82
83static void put_nfs_open_dir_context(struct nfs_open_dir_context *ctx)
84{
85 put_rpccred(ctx->cred);
86 kfree(ctx);
87}
88
89
90
91
92static int
93nfs_opendir(struct inode *inode, struct file *filp)
94{
95 int res = 0;
96 struct nfs_open_dir_context *ctx;
97 struct rpc_cred *cred;
98
99 dfprintk(FILE, "NFS: open dir(%s/%s)\n",
100 filp->f_path.dentry->d_parent->d_name.name,
101 filp->f_path.dentry->d_name.name);
102
103 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
104
105 cred = rpc_lookup_cred();
106 if (IS_ERR(cred))
107 return PTR_ERR(cred);
108 ctx = alloc_nfs_open_dir_context(inode, cred);
109 if (IS_ERR(ctx)) {
110 res = PTR_ERR(ctx);
111 goto out;
112 }
113 filp->private_data = ctx;
114 if (filp->f_path.dentry == filp->f_path.mnt->mnt_root) {
115
116
117
118
119 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
120 }
121out:
122 put_rpccred(cred);
123 return res;
124}
125
126static int
127nfs_closedir(struct inode *inode, struct file *filp)
128{
129 put_nfs_open_dir_context(filp->private_data);
130 return 0;
131}
132
133struct nfs_cache_array_entry {
134 u64 cookie;
135 u64 ino;
136 struct qstr string;
137 unsigned char d_type;
138};
139
140struct nfs_cache_array {
141 int size;
142 int eof_index;
143 u64 last_cookie;
144 struct nfs_cache_array_entry array[0];
145};
146
147typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int);
148typedef struct {
149 struct file *file;
150 struct page *page;
151 struct dir_context *ctx;
152 unsigned long page_index;
153 u64 *dir_cookie;
154 u64 last_cookie;
155 loff_t current_index;
156 decode_dirent_t decode;
157
158 unsigned long timestamp;
159 unsigned long gencount;
160 unsigned int cache_entry_index;
161 unsigned int plus:1;
162 unsigned int eof:1;
163} nfs_readdir_descriptor_t;
164
165
166
167
168static
169struct nfs_cache_array *nfs_readdir_get_array(struct page *page)
170{
171 void *ptr;
172 if (page == NULL)
173 return ERR_PTR(-EIO);
174 ptr = kmap(page);
175 if (ptr == NULL)
176 return ERR_PTR(-ENOMEM);
177 return ptr;
178}
179
180static
181void nfs_readdir_release_array(struct page *page)
182{
183 kunmap(page);
184}
185
186
187
188
189static
190void nfs_readdir_clear_array(struct page *page)
191{
192 struct nfs_cache_array *array;
193 int i;
194
195 array = kmap_atomic(page);
196 for (i = 0; i < array->size; i++)
197 kfree(array->array[i].string.name);
198 kunmap_atomic(array);
199}
200
201
202
203
204
205
206static
207int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
208{
209 string->len = len;
210 string->name = kmemdup(name, len, GFP_KERNEL);
211 if (string->name == NULL)
212 return -ENOMEM;
213
214
215
216
217 kmemleak_not_leak(string->name);
218 string->hash = full_name_hash(name, len);
219 return 0;
220}
221
222static
223int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
224{
225 struct nfs_cache_array *array = nfs_readdir_get_array(page);
226 struct nfs_cache_array_entry *cache_entry;
227 int ret;
228
229 if (IS_ERR(array))
230 return PTR_ERR(array);
231
232 cache_entry = &array->array[array->size];
233
234
235 ret = -ENOSPC;
236 if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE)
237 goto out;
238
239 cache_entry->cookie = entry->prev_cookie;
240 cache_entry->ino = entry->ino;
241 cache_entry->d_type = entry->d_type;
242 ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len);
243 if (ret)
244 goto out;
245 array->last_cookie = entry->cookie;
246 array->size++;
247 if (entry->eof != 0)
248 array->eof_index = array->size;
249out:
250 nfs_readdir_release_array(page);
251 return ret;
252}
253
254static
255int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
256{
257 loff_t diff = desc->ctx->pos - desc->current_index;
258 unsigned int index;
259
260 if (diff < 0)
261 goto out_eof;
262 if (diff >= array->size) {
263 if (array->eof_index >= 0)
264 goto out_eof;
265 return -EAGAIN;
266 }
267
268 index = (unsigned int)diff;
269 *desc->dir_cookie = array->array[index].cookie;
270 desc->cache_entry_index = index;
271 return 0;
272out_eof:
273 desc->eof = 1;
274 return -EBADCOOKIE;
275}
276
277static
278int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
279{
280 int i;
281 loff_t new_pos;
282 int status = -EAGAIN;
283
284 for (i = 0; i < array->size; i++) {
285 if (array->array[i].cookie == *desc->dir_cookie) {
286 struct nfs_inode *nfsi = NFS_I(file_inode(desc->file));
287 struct nfs_open_dir_context *ctx = desc->file->private_data;
288
289 new_pos = desc->current_index + i;
290 if (ctx->attr_gencount != nfsi->attr_gencount
291 || (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))) {
292 ctx->duped = 0;
293 ctx->attr_gencount = nfsi->attr_gencount;
294 } else if (new_pos < desc->ctx->pos) {
295 if (ctx->duped > 0
296 && ctx->dup_cookie == *desc->dir_cookie) {
297 if (printk_ratelimit()) {
298 pr_notice("NFS: directory %s/%s contains a readdir loop."
299 "Please contact your server vendor. "
300 "The file: %s has duplicate cookie %llu\n",
301 desc->file->f_dentry->d_parent->d_name.name,
302 desc->file->f_dentry->d_name.name,
303 array->array[i].string.name,
304 *desc->dir_cookie);
305 }
306 status = -ELOOP;
307 goto out;
308 }
309 ctx->dup_cookie = *desc->dir_cookie;
310 ctx->duped = -1;
311 }
312 desc->ctx->pos = new_pos;
313 desc->cache_entry_index = i;
314 return 0;
315 }
316 }
317 if (array->eof_index >= 0) {
318 status = -EBADCOOKIE;
319 if (*desc->dir_cookie == array->last_cookie)
320 desc->eof = 1;
321 }
322out:
323 return status;
324}
325
326static
327int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc)
328{
329 struct nfs_cache_array *array;
330 int status;
331
332 array = nfs_readdir_get_array(desc->page);
333 if (IS_ERR(array)) {
334 status = PTR_ERR(array);
335 goto out;
336 }
337
338 if (*desc->dir_cookie == 0)
339 status = nfs_readdir_search_for_pos(array, desc);
340 else
341 status = nfs_readdir_search_for_cookie(array, desc);
342
343 if (status == -EAGAIN) {
344 desc->last_cookie = array->last_cookie;
345 desc->current_index += array->size;
346 desc->page_index++;
347 }
348 nfs_readdir_release_array(desc->page);
349out:
350 return status;
351}
352
353
354static
355int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc,
356 struct nfs_entry *entry, struct file *file, struct inode *inode)
357{
358 struct nfs_open_dir_context *ctx = file->private_data;
359 struct rpc_cred *cred = ctx->cred;
360 unsigned long timestamp, gencount;
361 int error;
362
363 again:
364 timestamp = jiffies;
365 gencount = nfs_inc_attr_generation_counter();
366 error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, entry->cookie, pages,
367 NFS_SERVER(inode)->dtsize, desc->plus);
368 if (error < 0) {
369
370 if (error == -ENOTSUPP && desc->plus) {
371 NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS;
372 clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
373 desc->plus = 0;
374 goto again;
375 }
376 goto error;
377 }
378 desc->timestamp = timestamp;
379 desc->gencount = gencount;
380error:
381 return error;
382}
383
384static int xdr_decode(nfs_readdir_descriptor_t *desc,
385 struct nfs_entry *entry, struct xdr_stream *xdr)
386{
387 int error;
388
389 error = desc->decode(xdr, entry, desc->plus);
390 if (error)
391 return error;
392 entry->fattr->time_start = desc->timestamp;
393 entry->fattr->gencount = desc->gencount;
394 return 0;
395}
396
397static
398int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry)
399{
400 if (dentry->d_inode == NULL)
401 goto different;
402 if (nfs_compare_fh(entry->fh, NFS_FH(dentry->d_inode)) != 0)
403 goto different;
404 return 1;
405different:
406 return 0;
407}
408
409static
410bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx)
411{
412 if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS))
413 return false;
414 if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags))
415 return true;
416 if (ctx->pos == 0)
417 return true;
418 return false;
419}
420
421
422
423
424
425
426static
427void nfs_advise_use_readdirplus(struct inode *dir)
428{
429 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags);
430}
431
432static
433void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
434{
435 struct qstr filename = QSTR_INIT(entry->name, entry->len);
436 struct dentry *dentry;
437 struct dentry *alias;
438 struct inode *dir = parent->d_inode;
439 struct inode *inode;
440 int status;
441
442 if (filename.name[0] == '.') {
443 if (filename.len == 1)
444 return;
445 if (filename.len == 2 && filename.name[1] == '.')
446 return;
447 }
448 filename.hash = full_name_hash(filename.name, filename.len);
449
450 dentry = d_lookup(parent, &filename);
451 if (dentry != NULL) {
452 if (nfs_same_file(dentry, entry)) {
453 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
454 status = nfs_refresh_inode(dentry->d_inode, entry->fattr);
455 if (!status)
456 nfs_setsecurity(dentry->d_inode, entry->fattr, entry->label);
457 goto out;
458 } else {
459 if (d_invalidate(dentry) != 0)
460 goto out;
461 dput(dentry);
462 }
463 }
464
465 dentry = d_alloc(parent, &filename);
466 if (dentry == NULL)
467 return;
468
469 inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label);
470 if (IS_ERR(inode))
471 goto out;
472
473 alias = d_materialise_unique(dentry, inode);
474 if (IS_ERR(alias))
475 goto out;
476 else if (alias) {
477 nfs_set_verifier(alias, nfs_save_change_attribute(dir));
478 dput(alias);
479 } else
480 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
481
482out:
483 dput(dentry);
484}
485
486
487static
488int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry,
489 struct page **xdr_pages, struct page *page, unsigned int buflen)
490{
491 struct xdr_stream stream;
492 struct xdr_buf buf;
493 struct page *scratch;
494 struct nfs_cache_array *array;
495 unsigned int count = 0;
496 int status;
497
498 scratch = alloc_page(GFP_KERNEL);
499 if (scratch == NULL)
500 return -ENOMEM;
501
502 xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen);
503 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
504
505 do {
506 status = xdr_decode(desc, entry, &stream);
507 if (status != 0) {
508 if (status == -EAGAIN)
509 status = 0;
510 break;
511 }
512
513 count++;
514
515 if (desc->plus != 0)
516 nfs_prime_dcache(desc->file->f_path.dentry, entry);
517
518 status = nfs_readdir_add_to_array(entry, page);
519 if (status != 0)
520 break;
521 } while (!entry->eof);
522
523 if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) {
524 array = nfs_readdir_get_array(page);
525 if (!IS_ERR(array)) {
526 array->eof_index = array->size;
527 status = 0;
528 nfs_readdir_release_array(page);
529 } else
530 status = PTR_ERR(array);
531 }
532
533 put_page(scratch);
534 return status;
535}
536
537static
538void nfs_readdir_free_pagearray(struct page **pages, unsigned int npages)
539{
540 unsigned int i;
541 for (i = 0; i < npages; i++)
542 put_page(pages[i]);
543}
544
545static
546void nfs_readdir_free_large_page(void *ptr, struct page **pages,
547 unsigned int npages)
548{
549 nfs_readdir_free_pagearray(pages, npages);
550}
551
552
553
554
555
556static
557int nfs_readdir_large_page(struct page **pages, unsigned int npages)
558{
559 unsigned int i;
560
561 for (i = 0; i < npages; i++) {
562 struct page *page = alloc_page(GFP_KERNEL);
563 if (page == NULL)
564 goto out_freepages;
565 pages[i] = page;
566 }
567 return 0;
568
569out_freepages:
570 nfs_readdir_free_pagearray(pages, i);
571 return -ENOMEM;
572}
573
574static
575int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode)
576{
577 struct page *pages[NFS_MAX_READDIR_PAGES];
578 void *pages_ptr = NULL;
579 struct nfs_entry entry;
580 struct file *file = desc->file;
581 struct nfs_cache_array *array;
582 int status = -ENOMEM;
583 unsigned int array_size = ARRAY_SIZE(pages);
584
585 entry.prev_cookie = 0;
586 entry.cookie = desc->last_cookie;
587 entry.eof = 0;
588 entry.fh = nfs_alloc_fhandle();
589 entry.fattr = nfs_alloc_fattr();
590 entry.server = NFS_SERVER(inode);
591 if (entry.fh == NULL || entry.fattr == NULL)
592 goto out;
593
594 entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT);
595 if (IS_ERR(entry.label)) {
596 status = PTR_ERR(entry.label);
597 goto out;
598 }
599
600 array = nfs_readdir_get_array(page);
601 if (IS_ERR(array)) {
602 status = PTR_ERR(array);
603 goto out_label_free;
604 }
605 memset(array, 0, sizeof(struct nfs_cache_array));
606 array->eof_index = -1;
607
608 status = nfs_readdir_large_page(pages, array_size);
609 if (status < 0)
610 goto out_release_array;
611 do {
612 unsigned int pglen;
613 status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode);
614
615 if (status < 0)
616 break;
617 pglen = status;
618 status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen);
619 if (status < 0) {
620 if (status == -ENOSPC)
621 status = 0;
622 break;
623 }
624 } while (array->eof_index < 0);
625
626 nfs_readdir_free_large_page(pages_ptr, pages, array_size);
627out_release_array:
628 nfs_readdir_release_array(page);
629out_label_free:
630 nfs4_label_free(entry.label);
631out:
632 nfs_free_fattr(entry.fattr);
633 nfs_free_fhandle(entry.fh);
634 return status;
635}
636
637
638
639
640
641
642
643static
644int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page* page)
645{
646 struct inode *inode = file_inode(desc->file);
647 int ret;
648
649 ret = nfs_readdir_xdr_to_array(desc, page, inode);
650 if (ret < 0)
651 goto error;
652 SetPageUptodate(page);
653
654 if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) {
655
656 nfs_zap_mapping(inode, inode->i_mapping);
657 }
658 unlock_page(page);
659 return 0;
660 error:
661 unlock_page(page);
662 return ret;
663}
664
665static
666void cache_page_release(nfs_readdir_descriptor_t *desc)
667{
668 if (!desc->page->mapping)
669 nfs_readdir_clear_array(desc->page);
670 page_cache_release(desc->page);
671 desc->page = NULL;
672}
673
674static
675struct page *get_cache_page(nfs_readdir_descriptor_t *desc)
676{
677 return read_cache_page(file_inode(desc->file)->i_mapping,
678 desc->page_index, (filler_t *)nfs_readdir_filler, desc);
679}
680
681
682
683
684static
685int find_cache_page(nfs_readdir_descriptor_t *desc)
686{
687 int res;
688
689 desc->page = get_cache_page(desc);
690 if (IS_ERR(desc->page))
691 return PTR_ERR(desc->page);
692
693 res = nfs_readdir_search_array(desc);
694 if (res != 0)
695 cache_page_release(desc);
696 return res;
697}
698
699
700static inline
701int readdir_search_pagecache(nfs_readdir_descriptor_t *desc)
702{
703 int res;
704
705 if (desc->page_index == 0) {
706 desc->current_index = 0;
707 desc->last_cookie = 0;
708 }
709 do {
710 res = find_cache_page(desc);
711 } while (res == -EAGAIN);
712 return res;
713}
714
715
716
717
718static
719int nfs_do_filldir(nfs_readdir_descriptor_t *desc)
720{
721 struct file *file = desc->file;
722 int i = 0;
723 int res = 0;
724 struct nfs_cache_array *array = NULL;
725 struct nfs_open_dir_context *ctx = file->private_data;
726
727 array = nfs_readdir_get_array(desc->page);
728 if (IS_ERR(array)) {
729 res = PTR_ERR(array);
730 goto out;
731 }
732
733 for (i = desc->cache_entry_index; i < array->size; i++) {
734 struct nfs_cache_array_entry *ent;
735
736 ent = &array->array[i];
737 if (!dir_emit(desc->ctx, ent->string.name, ent->string.len,
738 nfs_compat_user_ino64(ent->ino), ent->d_type)) {
739 desc->eof = 1;
740 break;
741 }
742 desc->ctx->pos++;
743 if (i < (array->size-1))
744 *desc->dir_cookie = array->array[i+1].cookie;
745 else
746 *desc->dir_cookie = array->last_cookie;
747 if (ctx->duped != 0)
748 ctx->duped = 1;
749 }
750 if (array->eof_index >= 0)
751 desc->eof = 1;
752
753 nfs_readdir_release_array(desc->page);
754out:
755 cache_page_release(desc);
756 dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n",
757 (unsigned long long)*desc->dir_cookie, res);
758 return res;
759}
760
761
762
763
764
765
766
767
768
769
770
771
772
773static inline
774int uncached_readdir(nfs_readdir_descriptor_t *desc)
775{
776 struct page *page = NULL;
777 int status;
778 struct inode *inode = file_inode(desc->file);
779 struct nfs_open_dir_context *ctx = desc->file->private_data;
780
781 dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n",
782 (unsigned long long)*desc->dir_cookie);
783
784 page = alloc_page(GFP_HIGHUSER);
785 if (!page) {
786 status = -ENOMEM;
787 goto out;
788 }
789
790 desc->page_index = 0;
791 desc->last_cookie = *desc->dir_cookie;
792 desc->page = page;
793 ctx->duped = 0;
794
795 status = nfs_readdir_xdr_to_array(desc, page, inode);
796 if (status < 0)
797 goto out_release;
798
799 status = nfs_do_filldir(desc);
800
801 out:
802 dfprintk(DIRCACHE, "NFS: %s: returns %d\n",
803 __func__, status);
804 return status;
805 out_release:
806 cache_page_release(desc);
807 goto out;
808}
809
810
811
812
813
814static int nfs_readdir(struct file *file, struct dir_context *ctx)
815{
816 struct dentry *dentry = file->f_path.dentry;
817 struct inode *inode = dentry->d_inode;
818 nfs_readdir_descriptor_t my_desc,
819 *desc = &my_desc;
820 struct nfs_open_dir_context *dir_ctx = file->private_data;
821 int res = 0;
822
823 dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n",
824 dentry->d_parent->d_name.name, dentry->d_name.name,
825 (long long)ctx->pos);
826 nfs_inc_stats(inode, NFSIOS_VFSGETDENTS);
827
828
829
830
831
832
833
834 memset(desc, 0, sizeof(*desc));
835
836 desc->file = file;
837 desc->ctx = ctx;
838 desc->dir_cookie = &dir_ctx->dir_cookie;
839 desc->decode = NFS_PROTO(inode)->decode_dirent;
840 desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0;
841
842 nfs_block_sillyrename(dentry);
843 if (ctx->pos == 0 || nfs_attribute_cache_expired(inode))
844 res = nfs_revalidate_mapping(inode, file->f_mapping);
845 if (res < 0)
846 goto out;
847
848 do {
849 res = readdir_search_pagecache(desc);
850
851 if (res == -EBADCOOKIE) {
852 res = 0;
853
854 if (*desc->dir_cookie && desc->eof == 0) {
855
856 res = uncached_readdir(desc);
857 if (res == 0)
858 continue;
859 }
860 break;
861 }
862 if (res == -ETOOSMALL && desc->plus) {
863 clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
864 nfs_zap_caches(inode);
865 desc->page_index = 0;
866 desc->plus = 0;
867 desc->eof = 0;
868 continue;
869 }
870 if (res < 0)
871 break;
872
873 res = nfs_do_filldir(desc);
874 if (res < 0)
875 break;
876 } while (!desc->eof);
877out:
878 nfs_unblock_sillyrename(dentry);
879 if (res > 0)
880 res = 0;
881 dfprintk(FILE, "NFS: readdir(%s/%s) returns %d\n",
882 dentry->d_parent->d_name.name, dentry->d_name.name,
883 res);
884 return res;
885}
886
887static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
888{
889 struct dentry *dentry = filp->f_path.dentry;
890 struct inode *inode = dentry->d_inode;
891 struct nfs_open_dir_context *dir_ctx = filp->private_data;
892
893 dfprintk(FILE, "NFS: llseek dir(%s/%s, %lld, %d)\n",
894 dentry->d_parent->d_name.name,
895 dentry->d_name.name,
896 offset, whence);
897
898 mutex_lock(&inode->i_mutex);
899 switch (whence) {
900 case 1:
901 offset += filp->f_pos;
902 case 0:
903 if (offset >= 0)
904 break;
905 default:
906 offset = -EINVAL;
907 goto out;
908 }
909 if (offset != filp->f_pos) {
910 filp->f_pos = offset;
911 dir_ctx->dir_cookie = 0;
912 dir_ctx->duped = 0;
913 }
914out:
915 mutex_unlock(&inode->i_mutex);
916 return offset;
917}
918
919
920
921
922
923static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end,
924 int datasync)
925{
926 struct dentry *dentry = filp->f_path.dentry;
927 struct inode *inode = dentry->d_inode;
928
929 dfprintk(FILE, "NFS: fsync dir(%s/%s) datasync %d\n",
930 dentry->d_parent->d_name.name, dentry->d_name.name,
931 datasync);
932
933 mutex_lock(&inode->i_mutex);
934 nfs_inc_stats(dentry->d_inode, NFSIOS_VFSFSYNC);
935 mutex_unlock(&inode->i_mutex);
936 return 0;
937}
938
939
940
941
942
943
944
945
946
947
948
949void nfs_force_lookup_revalidate(struct inode *dir)
950{
951 NFS_I(dir)->cache_change_attribute++;
952}
953EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate);
954
955
956
957
958
959
960static int nfs_check_verifier(struct inode *dir, struct dentry *dentry)
961{
962 if (IS_ROOT(dentry))
963 return 1;
964 if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
965 return 0;
966 if (!nfs_verify_change_attribute(dir, dentry->d_time))
967 return 0;
968
969 if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)
970 return 0;
971 if (!nfs_verify_change_attribute(dir, dentry->d_time))
972 return 0;
973 return 1;
974}
975
976
977
978
979
980static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags)
981{
982 if (NFS_PROTO(dir)->version == 2)
983 return 0;
984 return flags & LOOKUP_EXCL;
985}
986
987
988
989
990
991
992
993
994
995static
996int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags)
997{
998 struct nfs_server *server = NFS_SERVER(inode);
999 int ret;
1000
1001 if (IS_AUTOMOUNT(inode))
1002 return 0;
1003
1004 if (flags & LOOKUP_REVAL)
1005 goto out_force;
1006
1007 if ((flags & LOOKUP_OPEN) && !(server->flags & NFS_MOUNT_NOCTO) &&
1008 (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
1009 goto out_force;
1010out:
1011 return (inode->i_nlink == 0) ? -ENOENT : 0;
1012out_force:
1013 ret = __nfs_revalidate_inode(server, inode);
1014 if (ret != 0)
1015 return ret;
1016 goto out;
1017}
1018
1019
1020
1021
1022
1023
1024
1025
1026static inline
1027int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry,
1028 unsigned int flags)
1029{
1030
1031 if (flags & LOOKUP_CREATE)
1032 return 0;
1033 if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG)
1034 return 1;
1035 return !nfs_check_verifier(dir, dentry);
1036}
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
1050{
1051 struct inode *dir;
1052 struct inode *inode;
1053 struct dentry *parent;
1054 struct nfs_fh *fhandle = NULL;
1055 struct nfs_fattr *fattr = NULL;
1056 struct nfs4_label *label = NULL;
1057 int error;
1058
1059 if (flags & LOOKUP_RCU)
1060 return -ECHILD;
1061
1062 parent = dget_parent(dentry);
1063 dir = parent->d_inode;
1064 nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
1065 inode = dentry->d_inode;
1066
1067 if (!inode) {
1068 if (nfs_neg_need_reval(dir, dentry, flags))
1069 goto out_bad;
1070 goto out_valid_noent;
1071 }
1072
1073 if (is_bad_inode(inode)) {
1074 dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n",
1075 __func__, dentry->d_parent->d_name.name,
1076 dentry->d_name.name);
1077 goto out_bad;
1078 }
1079
1080 if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ))
1081 goto out_set_verifier;
1082
1083
1084 if (!nfs_is_exclusive_create(dir, flags) && nfs_check_verifier(dir, dentry)) {
1085 if (nfs_lookup_verify_inode(inode, flags))
1086 goto out_zap_parent;
1087 goto out_valid;
1088 }
1089
1090 if (NFS_STALE(inode))
1091 goto out_bad;
1092
1093 error = -ENOMEM;
1094 fhandle = nfs_alloc_fhandle();
1095 fattr = nfs_alloc_fattr();
1096 if (fhandle == NULL || fattr == NULL)
1097 goto out_error;
1098
1099 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT);
1100 if (IS_ERR(label))
1101 goto out_error;
1102
1103 error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label);
1104 if (error)
1105 goto out_bad;
1106 if (nfs_compare_fh(NFS_FH(inode), fhandle))
1107 goto out_bad;
1108 if ((error = nfs_refresh_inode(inode, fattr)) != 0)
1109 goto out_bad;
1110
1111 nfs_setsecurity(inode, fattr, label);
1112
1113 nfs_free_fattr(fattr);
1114 nfs_free_fhandle(fhandle);
1115 nfs4_label_free(label);
1116
1117out_set_verifier:
1118 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1119 out_valid:
1120
1121 nfs_advise_use_readdirplus(dir);
1122 out_valid_noent:
1123 dput(parent);
1124 dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n",
1125 __func__, dentry->d_parent->d_name.name,
1126 dentry->d_name.name);
1127 return 1;
1128out_zap_parent:
1129 nfs_zap_caches(dir);
1130 out_bad:
1131 nfs_free_fattr(fattr);
1132 nfs_free_fhandle(fhandle);
1133 nfs4_label_free(label);
1134 nfs_mark_for_revalidate(dir);
1135 if (inode && S_ISDIR(inode->i_mode)) {
1136
1137 nfs_zap_caches(inode);
1138
1139 if (have_submounts(dentry))
1140 goto out_valid;
1141 if (dentry->d_flags & DCACHE_DISCONNECTED)
1142 goto out_valid;
1143 shrink_dcache_parent(dentry);
1144 }
1145 d_drop(dentry);
1146 dput(parent);
1147 dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n",
1148 __func__, dentry->d_parent->d_name.name,
1149 dentry->d_name.name);
1150 return 0;
1151out_error:
1152 nfs_free_fattr(fattr);
1153 nfs_free_fhandle(fhandle);
1154 nfs4_label_free(label);
1155 dput(parent);
1156 dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) lookup returned error %d\n",
1157 __func__, dentry->d_parent->d_name.name,
1158 dentry->d_name.name, error);
1159 return error;
1160}
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags)
1172{
1173 int error;
1174 struct inode *inode = dentry->d_inode;
1175
1176
1177
1178
1179
1180
1181 if (!inode) {
1182 dfprintk(LOOKUPCACHE, "%s: %s/%s has negative inode\n",
1183 __func__, dentry->d_parent->d_name.name,
1184 dentry->d_name.name);
1185 return 1;
1186 }
1187
1188 if (is_bad_inode(inode)) {
1189 dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n",
1190 __func__, dentry->d_parent->d_name.name,
1191 dentry->d_name.name);
1192 return 0;
1193 }
1194
1195 error = nfs_revalidate_inode(NFS_SERVER(inode), inode);
1196 dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n",
1197 __func__, inode->i_ino, error ? "invalid" : "valid");
1198 return !error;
1199}
1200
1201
1202
1203
1204static int nfs_dentry_delete(const struct dentry *dentry)
1205{
1206 dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n",
1207 dentry->d_parent->d_name.name, dentry->d_name.name,
1208 dentry->d_flags);
1209
1210
1211 if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode))
1212 return 1;
1213
1214 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
1215
1216 return 1;
1217 }
1218 if (!(dentry->d_sb->s_flags & MS_ACTIVE)) {
1219
1220
1221 return 1;
1222 }
1223 return 0;
1224
1225}
1226
1227
1228static void nfs_drop_nlink(struct inode *inode)
1229{
1230 spin_lock(&inode->i_lock);
1231
1232 if (inode->i_nlink == 1)
1233 clear_nlink(inode);
1234 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
1235 spin_unlock(&inode->i_lock);
1236}
1237
1238
1239
1240
1241
1242static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode)
1243{
1244 if (S_ISDIR(inode->i_mode))
1245
1246 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
1247
1248 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
1249 nfs_complete_unlink(dentry, inode);
1250 nfs_drop_nlink(inode);
1251 }
1252 iput(inode);
1253}
1254
1255static void nfs_d_release(struct dentry *dentry)
1256{
1257
1258 if (unlikely(dentry->d_fsdata)) {
1259 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
1260 WARN_ON(1);
1261 else
1262 kfree(dentry->d_fsdata);
1263 }
1264}
1265
1266const struct dentry_operations nfs_dentry_operations = {
1267 .d_revalidate = nfs_lookup_revalidate,
1268 .d_weak_revalidate = nfs_weak_revalidate,
1269 .d_delete = nfs_dentry_delete,
1270 .d_iput = nfs_dentry_iput,
1271 .d_automount = nfs_d_automount,
1272 .d_release = nfs_d_release,
1273};
1274EXPORT_SYMBOL_GPL(nfs_dentry_operations);
1275
1276struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
1277{
1278 struct dentry *res;
1279 struct dentry *parent;
1280 struct inode *inode = NULL;
1281 struct nfs_fh *fhandle = NULL;
1282 struct nfs_fattr *fattr = NULL;
1283 struct nfs4_label *label = NULL;
1284 int error;
1285
1286 dfprintk(VFS, "NFS: lookup(%s/%s)\n",
1287 dentry->d_parent->d_name.name, dentry->d_name.name);
1288 nfs_inc_stats(dir, NFSIOS_VFSLOOKUP);
1289
1290 res = ERR_PTR(-ENAMETOOLONG);
1291 if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
1292 goto out;
1293
1294
1295
1296
1297
1298 if (nfs_is_exclusive_create(dir, flags)) {
1299 d_instantiate(dentry, NULL);
1300 res = NULL;
1301 goto out;
1302 }
1303
1304 res = ERR_PTR(-ENOMEM);
1305 fhandle = nfs_alloc_fhandle();
1306 fattr = nfs_alloc_fattr();
1307 if (fhandle == NULL || fattr == NULL)
1308 goto out;
1309
1310 label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT);
1311 if (IS_ERR(label))
1312 goto out;
1313
1314 parent = dentry->d_parent;
1315
1316 nfs_block_sillyrename(parent);
1317 error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label);
1318 if (error == -ENOENT)
1319 goto no_entry;
1320 if (error < 0) {
1321 res = ERR_PTR(error);
1322 goto out_unblock_sillyrename;
1323 }
1324 inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label);
1325 res = ERR_CAST(inode);
1326 if (IS_ERR(res))
1327 goto out_unblock_sillyrename;
1328
1329
1330 nfs_advise_use_readdirplus(dir);
1331
1332no_entry:
1333 res = d_materialise_unique(dentry, inode);
1334 if (res != NULL) {
1335 if (IS_ERR(res))
1336 goto out_unblock_sillyrename;
1337 dentry = res;
1338 }
1339 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1340out_unblock_sillyrename:
1341 nfs_unblock_sillyrename(parent);
1342 nfs4_label_free(label);
1343out:
1344 nfs_free_fattr(fattr);
1345 nfs_free_fhandle(fhandle);
1346 return res;
1347}
1348EXPORT_SYMBOL_GPL(nfs_lookup);
1349
1350#if IS_ENABLED(CONFIG_NFS_V4)
1351static int nfs4_lookup_revalidate(struct dentry *, unsigned int);
1352
1353const struct dentry_operations nfs4_dentry_operations = {
1354 .d_revalidate = nfs4_lookup_revalidate,
1355 .d_delete = nfs_dentry_delete,
1356 .d_iput = nfs_dentry_iput,
1357 .d_automount = nfs_d_automount,
1358 .d_release = nfs_d_release,
1359};
1360EXPORT_SYMBOL_GPL(nfs4_dentry_operations);
1361
1362static fmode_t flags_to_mode(int flags)
1363{
1364 fmode_t res = (__force fmode_t)flags & FMODE_EXEC;
1365 if ((flags & O_ACCMODE) != O_WRONLY)
1366 res |= FMODE_READ;
1367 if ((flags & O_ACCMODE) != O_RDONLY)
1368 res |= FMODE_WRITE;
1369 return res;
1370}
1371
1372static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags)
1373{
1374 return alloc_nfs_open_context(dentry, flags_to_mode(open_flags));
1375}
1376
1377static int do_open(struct inode *inode, struct file *filp)
1378{
1379 nfs_fscache_set_inode_cookie(inode, filp);
1380 return 0;
1381}
1382
1383static int nfs_finish_open(struct nfs_open_context *ctx,
1384 struct dentry *dentry,
1385 struct file *file, unsigned open_flags,
1386 int *opened)
1387{
1388 int err;
1389
1390 err = finish_open(file, dentry, do_open, opened);
1391 if (err)
1392 goto out;
1393 nfs_file_set_open_context(file, ctx);
1394
1395out:
1396 put_nfs_open_context(ctx);
1397 return err;
1398}
1399
1400int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
1401 struct file *file, unsigned open_flags,
1402 umode_t mode, int *opened)
1403{
1404 struct nfs_open_context *ctx;
1405 struct dentry *res;
1406 struct iattr attr = { .ia_valid = ATTR_OPEN };
1407 struct inode *inode;
1408 int err;
1409
1410
1411 BUG_ON(dentry->d_inode);
1412
1413 dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n",
1414 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
1415
1416
1417 if ((open_flags & O_DIRECTORY)) {
1418 if (!d_unhashed(dentry)) {
1419
1420
1421
1422
1423
1424 return -ENOENT;
1425 }
1426 goto no_open;
1427 }
1428
1429 if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
1430 return -ENAMETOOLONG;
1431
1432 if (open_flags & O_CREAT) {
1433 attr.ia_valid |= ATTR_MODE;
1434 attr.ia_mode = mode & ~current_umask();
1435 }
1436 if (open_flags & O_TRUNC) {
1437 attr.ia_valid |= ATTR_SIZE;
1438 attr.ia_size = 0;
1439 }
1440
1441 ctx = create_nfs_open_context(dentry, open_flags);
1442 err = PTR_ERR(ctx);
1443 if (IS_ERR(ctx))
1444 goto out;
1445
1446 nfs_block_sillyrename(dentry->d_parent);
1447 inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr);
1448 nfs_unblock_sillyrename(dentry->d_parent);
1449 if (IS_ERR(inode)) {
1450 put_nfs_open_context(ctx);
1451 err = PTR_ERR(inode);
1452 switch (err) {
1453 case -ENOENT:
1454 d_drop(dentry);
1455 d_add(dentry, NULL);
1456 break;
1457 case -EISDIR:
1458 case -ENOTDIR:
1459 goto no_open;
1460 case -ELOOP:
1461 if (!(open_flags & O_NOFOLLOW))
1462 goto no_open;
1463 break;
1464
1465 default:
1466 break;
1467 }
1468 goto out;
1469 }
1470
1471 err = nfs_finish_open(ctx, ctx->dentry, file, open_flags, opened);
1472out:
1473 return err;
1474
1475no_open:
1476 res = nfs_lookup(dir, dentry, 0);
1477 err = PTR_ERR(res);
1478 if (IS_ERR(res))
1479 goto out;
1480
1481 return finish_no_open(file, res);
1482}
1483EXPORT_SYMBOL_GPL(nfs_atomic_open);
1484
1485static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags)
1486{
1487 struct dentry *parent = NULL;
1488 struct inode *inode;
1489 struct inode *dir;
1490 int ret = 0;
1491
1492 if (flags & LOOKUP_RCU)
1493 return -ECHILD;
1494
1495 if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY))
1496 goto no_open;
1497 if (d_mountpoint(dentry))
1498 goto no_open;
1499 if (NFS_SB(dentry->d_sb)->caps & NFS_CAP_ATOMIC_OPEN_V1)
1500 goto no_open;
1501
1502 inode = dentry->d_inode;
1503 parent = dget_parent(dentry);
1504 dir = parent->d_inode;
1505
1506
1507
1508
1509 if (inode == NULL) {
1510 if (!nfs_neg_need_reval(dir, dentry, flags))
1511 ret = 1;
1512 goto out;
1513 }
1514
1515
1516 if (!S_ISREG(inode->i_mode))
1517 goto no_open_dput;
1518
1519 if (flags & LOOKUP_EXCL)
1520 goto no_open_dput;
1521
1522
1523 ret = 1;
1524
1525out:
1526 dput(parent);
1527 return ret;
1528
1529no_open_dput:
1530 dput(parent);
1531no_open:
1532 return nfs_lookup_revalidate(dentry, flags);
1533}
1534
1535#endif
1536
1537
1538
1539
1540int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle,
1541 struct nfs_fattr *fattr,
1542 struct nfs4_label *label)
1543{
1544 struct dentry *parent = dget_parent(dentry);
1545 struct inode *dir = parent->d_inode;
1546 struct inode *inode;
1547 int error = -EACCES;
1548
1549 d_drop(dentry);
1550
1551
1552 if (dentry->d_inode)
1553 goto out;
1554 if (fhandle->size == 0) {
1555 error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL);
1556 if (error)
1557 goto out_error;
1558 }
1559 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1560 if (!(fattr->valid & NFS_ATTR_FATTR)) {
1561 struct nfs_server *server = NFS_SB(dentry->d_sb);
1562 error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr, NULL);
1563 if (error < 0)
1564 goto out_error;
1565 }
1566 inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label);
1567 error = PTR_ERR(inode);
1568 if (IS_ERR(inode))
1569 goto out_error;
1570 d_add(dentry, inode);
1571out:
1572 dput(parent);
1573 return 0;
1574out_error:
1575 nfs_mark_for_revalidate(dir);
1576 dput(parent);
1577 return error;
1578}
1579EXPORT_SYMBOL_GPL(nfs_instantiate);
1580
1581
1582
1583
1584
1585
1586
1587int nfs_create(struct inode *dir, struct dentry *dentry,
1588 umode_t mode, bool excl)
1589{
1590 struct iattr attr;
1591 int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT;
1592 int error;
1593
1594 dfprintk(VFS, "NFS: create(%s/%ld), %s\n",
1595 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
1596
1597 attr.ia_mode = mode;
1598 attr.ia_valid = ATTR_MODE;
1599
1600 error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags);
1601 if (error != 0)
1602 goto out_err;
1603 return 0;
1604out_err:
1605 d_drop(dentry);
1606 return error;
1607}
1608EXPORT_SYMBOL_GPL(nfs_create);
1609
1610
1611
1612
1613int
1614nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1615{
1616 struct iattr attr;
1617 int status;
1618
1619 dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n",
1620 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
1621
1622 if (!new_valid_dev(rdev))
1623 return -EINVAL;
1624
1625 attr.ia_mode = mode;
1626 attr.ia_valid = ATTR_MODE;
1627
1628 status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev);
1629 if (status != 0)
1630 goto out_err;
1631 return 0;
1632out_err:
1633 d_drop(dentry);
1634 return status;
1635}
1636EXPORT_SYMBOL_GPL(nfs_mknod);
1637
1638
1639
1640
1641int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1642{
1643 struct iattr attr;
1644 int error;
1645
1646 dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n",
1647 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
1648
1649 attr.ia_valid = ATTR_MODE;
1650 attr.ia_mode = mode | S_IFDIR;
1651
1652 error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr);
1653 if (error != 0)
1654 goto out_err;
1655 return 0;
1656out_err:
1657 d_drop(dentry);
1658 return error;
1659}
1660EXPORT_SYMBOL_GPL(nfs_mkdir);
1661
1662static void nfs_dentry_handle_enoent(struct dentry *dentry)
1663{
1664 if (dentry->d_inode != NULL && !d_unhashed(dentry))
1665 d_delete(dentry);
1666}
1667
1668int nfs_rmdir(struct inode *dir, struct dentry *dentry)
1669{
1670 int error;
1671
1672 dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n",
1673 dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
1674
1675 error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
1676
1677 if (error == 0 && dentry->d_inode != NULL)
1678 clear_nlink(dentry->d_inode);
1679 else if (error == -ENOENT)
1680 nfs_dentry_handle_enoent(dentry);
1681
1682 return error;
1683}
1684EXPORT_SYMBOL_GPL(nfs_rmdir);
1685
1686
1687
1688
1689
1690
1691
1692
1693static int nfs_safe_remove(struct dentry *dentry)
1694{
1695 struct inode *dir = dentry->d_parent->d_inode;
1696 struct inode *inode = dentry->d_inode;
1697 int error = -EBUSY;
1698
1699 dfprintk(VFS, "NFS: safe_remove(%s/%s)\n",
1700 dentry->d_parent->d_name.name, dentry->d_name.name);
1701
1702
1703 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
1704 error = 0;
1705 goto out;
1706 }
1707
1708 if (inode != NULL) {
1709 NFS_PROTO(inode)->return_delegation(inode);
1710 error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
1711 if (error == 0)
1712 nfs_drop_nlink(inode);
1713 } else
1714 error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
1715 if (error == -ENOENT)
1716 nfs_dentry_handle_enoent(dentry);
1717out:
1718 return error;
1719}
1720
1721
1722
1723
1724
1725
1726int nfs_unlink(struct inode *dir, struct dentry *dentry)
1727{
1728 int error;
1729 int need_rehash = 0;
1730
1731 dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id,
1732 dir->i_ino, dentry->d_name.name);
1733
1734 spin_lock(&dentry->d_lock);
1735 if (d_count(dentry) > 1) {
1736 spin_unlock(&dentry->d_lock);
1737
1738 write_inode_now(dentry->d_inode, 0);
1739 error = nfs_sillyrename(dir, dentry);
1740 return error;
1741 }
1742 if (!d_unhashed(dentry)) {
1743 __d_drop(dentry);
1744 need_rehash = 1;
1745 }
1746 spin_unlock(&dentry->d_lock);
1747 error = nfs_safe_remove(dentry);
1748 if (!error || error == -ENOENT) {
1749 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1750 } else if (need_rehash)
1751 d_rehash(dentry);
1752 return error;
1753}
1754EXPORT_SYMBOL_GPL(nfs_unlink);
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1772{
1773 struct page *page;
1774 char *kaddr;
1775 struct iattr attr;
1776 unsigned int pathlen = strlen(symname);
1777 int error;
1778
1779 dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id,
1780 dir->i_ino, dentry->d_name.name, symname);
1781
1782 if (pathlen > PAGE_SIZE)
1783 return -ENAMETOOLONG;
1784
1785 attr.ia_mode = S_IFLNK | S_IRWXUGO;
1786 attr.ia_valid = ATTR_MODE;
1787
1788 page = alloc_page(GFP_HIGHUSER);
1789 if (!page)
1790 return -ENOMEM;
1791
1792 kaddr = kmap_atomic(page);
1793 memcpy(kaddr, symname, pathlen);
1794 if (pathlen < PAGE_SIZE)
1795 memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen);
1796 kunmap_atomic(kaddr);
1797
1798 error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr);
1799 if (error != 0) {
1800 dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n",
1801 dir->i_sb->s_id, dir->i_ino,
1802 dentry->d_name.name, symname, error);
1803 d_drop(dentry);
1804 __free_page(page);
1805 return error;
1806 }
1807
1808
1809
1810
1811
1812 if (!add_to_page_cache_lru(page, dentry->d_inode->i_mapping, 0,
1813 GFP_KERNEL)) {
1814 SetPageUptodate(page);
1815 unlock_page(page);
1816 } else
1817 __free_page(page);
1818
1819 return 0;
1820}
1821EXPORT_SYMBOL_GPL(nfs_symlink);
1822
1823int
1824nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
1825{
1826 struct inode *inode = old_dentry->d_inode;
1827 int error;
1828
1829 dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n",
1830 old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
1831 dentry->d_parent->d_name.name, dentry->d_name.name);
1832
1833 NFS_PROTO(inode)->return_delegation(inode);
1834
1835 d_drop(dentry);
1836 error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
1837 if (error == 0) {
1838 ihold(inode);
1839 d_add(dentry, inode);
1840 }
1841 return error;
1842}
1843EXPORT_SYMBOL_GPL(nfs_link);
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1870 struct inode *new_dir, struct dentry *new_dentry)
1871{
1872 struct inode *old_inode = old_dentry->d_inode;
1873 struct inode *new_inode = new_dentry->d_inode;
1874 struct dentry *dentry = NULL, *rehash = NULL;
1875 int error = -EBUSY;
1876
1877 dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n",
1878 old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
1879 new_dentry->d_parent->d_name.name, new_dentry->d_name.name,
1880 d_count(new_dentry));
1881
1882
1883
1884
1885
1886
1887
1888 if (new_inode && !S_ISDIR(new_inode->i_mode)) {
1889
1890
1891
1892
1893 if (!d_unhashed(new_dentry)) {
1894 d_drop(new_dentry);
1895 rehash = new_dentry;
1896 }
1897
1898 if (d_count(new_dentry) > 2) {
1899 int err;
1900
1901
1902 dentry = d_alloc(new_dentry->d_parent,
1903 &new_dentry->d_name);
1904 if (!dentry)
1905 goto out;
1906
1907
1908 err = nfs_sillyrename(new_dir, new_dentry);
1909 if (err)
1910 goto out;
1911
1912 new_dentry = dentry;
1913 rehash = NULL;
1914 new_inode = NULL;
1915 }
1916 }
1917
1918 NFS_PROTO(old_inode)->return_delegation(old_inode);
1919 if (new_inode != NULL)
1920 NFS_PROTO(new_inode)->return_delegation(new_inode);
1921
1922 error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name,
1923 new_dir, &new_dentry->d_name);
1924 nfs_mark_for_revalidate(old_inode);
1925out:
1926 if (rehash)
1927 d_rehash(rehash);
1928 if (!error) {
1929 if (new_inode != NULL)
1930 nfs_drop_nlink(new_inode);
1931 d_move(old_dentry, new_dentry);
1932 nfs_set_verifier(new_dentry,
1933 nfs_save_change_attribute(new_dir));
1934 } else if (error == -ENOENT)
1935 nfs_dentry_handle_enoent(old_dentry);
1936
1937
1938 if (dentry)
1939 dput(dentry);
1940 return error;
1941}
1942EXPORT_SYMBOL_GPL(nfs_rename);
1943
1944static DEFINE_SPINLOCK(nfs_access_lru_lock);
1945static LIST_HEAD(nfs_access_lru_list);
1946static atomic_long_t nfs_access_nr_entries;
1947
1948static void nfs_access_free_entry(struct nfs_access_entry *entry)
1949{
1950 put_rpccred(entry->cred);
1951 kfree(entry);
1952 smp_mb__before_atomic_dec();
1953 atomic_long_dec(&nfs_access_nr_entries);
1954 smp_mb__after_atomic_dec();
1955}
1956
1957static void nfs_access_free_list(struct list_head *head)
1958{
1959 struct nfs_access_entry *cache;
1960
1961 while (!list_empty(head)) {
1962 cache = list_entry(head->next, struct nfs_access_entry, lru);
1963 list_del(&cache->lru);
1964 nfs_access_free_entry(cache);
1965 }
1966}
1967
1968int nfs_access_cache_shrinker(struct shrinker *shrink,
1969 struct shrink_control *sc)
1970{
1971 LIST_HEAD(head);
1972 struct nfs_inode *nfsi, *next;
1973 struct nfs_access_entry *cache;
1974 int nr_to_scan = sc->nr_to_scan;
1975 gfp_t gfp_mask = sc->gfp_mask;
1976
1977 if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL)
1978 return (nr_to_scan == 0) ? 0 : -1;
1979
1980 spin_lock(&nfs_access_lru_lock);
1981 list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) {
1982 struct inode *inode;
1983
1984 if (nr_to_scan-- == 0)
1985 break;
1986 inode = &nfsi->vfs_inode;
1987 spin_lock(&inode->i_lock);
1988 if (list_empty(&nfsi->access_cache_entry_lru))
1989 goto remove_lru_entry;
1990 cache = list_entry(nfsi->access_cache_entry_lru.next,
1991 struct nfs_access_entry, lru);
1992 list_move(&cache->lru, &head);
1993 rb_erase(&cache->rb_node, &nfsi->access_cache);
1994 if (!list_empty(&nfsi->access_cache_entry_lru))
1995 list_move_tail(&nfsi->access_cache_inode_lru,
1996 &nfs_access_lru_list);
1997 else {
1998remove_lru_entry:
1999 list_del_init(&nfsi->access_cache_inode_lru);
2000 smp_mb__before_clear_bit();
2001 clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags);
2002 smp_mb__after_clear_bit();
2003 }
2004 spin_unlock(&inode->i_lock);
2005 }
2006 spin_unlock(&nfs_access_lru_lock);
2007 nfs_access_free_list(&head);
2008 return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure;
2009}
2010
2011static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head)
2012{
2013 struct rb_root *root_node = &nfsi->access_cache;
2014 struct rb_node *n;
2015 struct nfs_access_entry *entry;
2016
2017
2018 while ((n = rb_first(root_node)) != NULL) {
2019 entry = rb_entry(n, struct nfs_access_entry, rb_node);
2020 rb_erase(n, root_node);
2021 list_move(&entry->lru, head);
2022 }
2023 nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS;
2024}
2025
2026void nfs_access_zap_cache(struct inode *inode)
2027{
2028 LIST_HEAD(head);
2029
2030 if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0)
2031 return;
2032
2033 spin_lock(&nfs_access_lru_lock);
2034 if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags))
2035 list_del_init(&NFS_I(inode)->access_cache_inode_lru);
2036
2037 spin_lock(&inode->i_lock);
2038 __nfs_access_zap_cache(NFS_I(inode), &head);
2039 spin_unlock(&inode->i_lock);
2040 spin_unlock(&nfs_access_lru_lock);
2041 nfs_access_free_list(&head);
2042}
2043EXPORT_SYMBOL_GPL(nfs_access_zap_cache);
2044
2045static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred)
2046{
2047 struct rb_node *n = NFS_I(inode)->access_cache.rb_node;
2048 struct nfs_access_entry *entry;
2049
2050 while (n != NULL) {
2051 entry = rb_entry(n, struct nfs_access_entry, rb_node);
2052
2053 if (cred < entry->cred)
2054 n = n->rb_left;
2055 else if (cred > entry->cred)
2056 n = n->rb_right;
2057 else
2058 return entry;
2059 }
2060 return NULL;
2061}
2062
2063static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res)
2064{
2065 struct nfs_inode *nfsi = NFS_I(inode);
2066 struct nfs_access_entry *cache;
2067 int err = -ENOENT;
2068
2069 spin_lock(&inode->i_lock);
2070 if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS)
2071 goto out_zap;
2072 cache = nfs_access_search_rbtree(inode, cred);
2073 if (cache == NULL)
2074 goto out;
2075 if (!nfs_have_delegated_attributes(inode) &&
2076 !time_in_range_open(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo))
2077 goto out_stale;
2078 res->jiffies = cache->jiffies;
2079 res->cred = cache->cred;
2080 res->mask = cache->mask;
2081 list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru);
2082 err = 0;
2083out:
2084 spin_unlock(&inode->i_lock);
2085 return err;
2086out_stale:
2087 rb_erase(&cache->rb_node, &nfsi->access_cache);
2088 list_del(&cache->lru);
2089 spin_unlock(&inode->i_lock);
2090 nfs_access_free_entry(cache);
2091 return -ENOENT;
2092out_zap:
2093 spin_unlock(&inode->i_lock);
2094 nfs_access_zap_cache(inode);
2095 return -ENOENT;
2096}
2097
2098static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set)
2099{
2100 struct nfs_inode *nfsi = NFS_I(inode);
2101 struct rb_root *root_node = &nfsi->access_cache;
2102 struct rb_node **p = &root_node->rb_node;
2103 struct rb_node *parent = NULL;
2104 struct nfs_access_entry *entry;
2105
2106 spin_lock(&inode->i_lock);
2107 while (*p != NULL) {
2108 parent = *p;
2109 entry = rb_entry(parent, struct nfs_access_entry, rb_node);
2110
2111 if (set->cred < entry->cred)
2112 p = &parent->rb_left;
2113 else if (set->cred > entry->cred)
2114 p = &parent->rb_right;
2115 else
2116 goto found;
2117 }
2118 rb_link_node(&set->rb_node, parent, p);
2119 rb_insert_color(&set->rb_node, root_node);
2120 list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
2121 spin_unlock(&inode->i_lock);
2122 return;
2123found:
2124 rb_replace_node(parent, &set->rb_node, root_node);
2125 list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
2126 list_del(&entry->lru);
2127 spin_unlock(&inode->i_lock);
2128 nfs_access_free_entry(entry);
2129}
2130
2131void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set)
2132{
2133 struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL);
2134 if (cache == NULL)
2135 return;
2136 RB_CLEAR_NODE(&cache->rb_node);
2137 cache->jiffies = set->jiffies;
2138 cache->cred = get_rpccred(set->cred);
2139 cache->mask = set->mask;
2140
2141 nfs_access_add_rbtree(inode, cache);
2142
2143
2144 smp_mb__before_atomic_inc();
2145 atomic_long_inc(&nfs_access_nr_entries);
2146 smp_mb__after_atomic_inc();
2147
2148
2149 if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) {
2150 spin_lock(&nfs_access_lru_lock);
2151 if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags))
2152 list_add_tail(&NFS_I(inode)->access_cache_inode_lru,
2153 &nfs_access_lru_list);
2154 spin_unlock(&nfs_access_lru_lock);
2155 }
2156}
2157EXPORT_SYMBOL_GPL(nfs_access_add_cache);
2158
2159void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result)
2160{
2161 entry->mask = 0;
2162 if (access_result & NFS4_ACCESS_READ)
2163 entry->mask |= MAY_READ;
2164 if (access_result &
2165 (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2166 entry->mask |= MAY_WRITE;
2167 if (access_result & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2168 entry->mask |= MAY_EXEC;
2169}
2170EXPORT_SYMBOL_GPL(nfs_access_set_mask);
2171
2172static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask)
2173{
2174 struct nfs_access_entry cache;
2175 int status;
2176
2177 status = nfs_access_get_cached(inode, cred, &cache);
2178 if (status == 0)
2179 goto out;
2180
2181
2182 cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
2183 cache.cred = cred;
2184 cache.jiffies = jiffies;
2185 status = NFS_PROTO(inode)->access(inode, &cache);
2186 if (status != 0) {
2187 if (status == -ESTALE) {
2188 nfs_zap_caches(inode);
2189 if (!S_ISDIR(inode->i_mode))
2190 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
2191 }
2192 return status;
2193 }
2194 nfs_access_add_cache(inode, &cache);
2195out:
2196 if ((mask & ~cache.mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0)
2197 return 0;
2198 return -EACCES;
2199}
2200
2201static int nfs_open_permission_mask(int openflags)
2202{
2203 int mask = 0;
2204
2205 if (openflags & __FMODE_EXEC) {
2206
2207 mask = MAY_EXEC;
2208 } else {
2209 if ((openflags & O_ACCMODE) != O_WRONLY)
2210 mask |= MAY_READ;
2211 if ((openflags & O_ACCMODE) != O_RDONLY)
2212 mask |= MAY_WRITE;
2213 }
2214
2215 return mask;
2216}
2217
2218int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags)
2219{
2220 return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags));
2221}
2222EXPORT_SYMBOL_GPL(nfs_may_open);
2223
2224int nfs_permission(struct inode *inode, int mask)
2225{
2226 struct rpc_cred *cred;
2227 int res = 0;
2228
2229 if (mask & MAY_NOT_BLOCK)
2230 return -ECHILD;
2231
2232 nfs_inc_stats(inode, NFSIOS_VFSACCESS);
2233
2234 if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0)
2235 goto out;
2236
2237 if (mask & (MAY_ACCESS | MAY_CHDIR))
2238 goto force_lookup;
2239
2240 switch (inode->i_mode & S_IFMT) {
2241 case S_IFLNK:
2242 goto out;
2243 case S_IFREG:
2244
2245 if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)
2246 && (mask & MAY_OPEN)
2247 && !(mask & MAY_EXEC))
2248 goto out;
2249 break;
2250 case S_IFDIR:
2251
2252
2253
2254
2255 if ((mask & MAY_WRITE) && !(mask & MAY_READ))
2256 goto out;
2257 }
2258
2259force_lookup:
2260 if (!NFS_PROTO(inode)->access)
2261 goto out_notsup;
2262
2263 cred = rpc_lookup_cred();
2264 if (!IS_ERR(cred)) {
2265 res = nfs_do_access(inode, cred, mask);
2266 put_rpccred(cred);
2267 } else
2268 res = PTR_ERR(cred);
2269out:
2270 if (!res && (mask & MAY_EXEC) && !execute_ok(inode))
2271 res = -EACCES;
2272
2273 dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n",
2274 inode->i_sb->s_id, inode->i_ino, mask, res);
2275 return res;
2276out_notsup:
2277 res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
2278 if (res == 0)
2279 res = generic_permission(inode, mask);
2280 goto out;
2281}
2282EXPORT_SYMBOL_GPL(nfs_permission);
2283
2284
2285
2286
2287
2288
2289
2290