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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/nfs3proc.c
4 *
5 * Client-side NFSv3 procedures stubs.
6 *
7 * Copyright (C) 1997, Olaf Kirch
8 */
9
10#include <linux/mm.h>
11#include <linux/errno.h>
12#include <linux/string.h>
13#include <linux/sunrpc/clnt.h>
14#include <linux/slab.h>
15#include <linux/nfs.h>
16#include <linux/nfs3.h>
17#include <linux/nfs_fs.h>
18#include <linux/nfs_page.h>
19#include <linux/lockd/bind.h>
20#include <linux/nfs_mount.h>
21#include <linux/freezer.h>
22#include <linux/xattr.h>
23
24#include "iostat.h"
25#include "internal.h"
26#include "nfs3_fs.h"
27
28#define NFSDBG_FACILITY NFSDBG_PROC
29
30/* A wrapper to handle the EJUKEBOX error messages */
31static int
32nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
33{
34 int res;
35 do {
36 res = rpc_call_sync(clnt, msg, flags);
37 if (res != -EJUKEBOX)
38 break;
39 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
40 schedule_timeout(NFS_JUKEBOX_RETRY_TIME);
41 res = -ERESTARTSYS;
42 } while (!fatal_signal_pending(current));
43 return res;
44}
45
46#define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
47
48static int
49nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
50{
51 if (task->tk_status != -EJUKEBOX)
52 return 0;
53 nfs_inc_stats(inode, NFSIOS_DELAY);
54 task->tk_status = 0;
55 rpc_restart_call(task);
56 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
57 return 1;
58}
59
60static int
61do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle,
62 struct nfs_fsinfo *info)
63{
64 struct rpc_message msg = {
65 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
66 .rpc_argp = fhandle,
67 .rpc_resp = info,
68 };
69 int status;
70
71 dprintk("%s: call fsinfo\n", __func__);
72 nfs_fattr_init(info->fattr);
73 status = rpc_call_sync(client, &msg, 0);
74 dprintk("%s: reply fsinfo: %d\n", __func__, status);
75 if (status == 0 && !(info->fattr->valid & NFS_ATTR_FATTR)) {
76 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
77 msg.rpc_resp = info->fattr;
78 status = rpc_call_sync(client, &msg, 0);
79 dprintk("%s: reply getattr: %d\n", __func__, status);
80 }
81 return status;
82}
83
84/*
85 * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb
86 */
87static int
88nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
89 struct nfs_fsinfo *info)
90{
91 int status;
92
93 status = do_proc_get_root(server->client, fhandle, info);
94 if (status && server->nfs_client->cl_rpcclient != server->client)
95 status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info);
96 return status;
97}
98
99/*
100 * One function for each procedure in the NFS protocol.
101 */
102static int
103nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
104 struct nfs_fattr *fattr, struct inode *inode)
105{
106 struct rpc_message msg = {
107 .rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR],
108 .rpc_argp = fhandle,
109 .rpc_resp = fattr,
110 };
111 int status;
112 unsigned short task_flags = 0;
113
114 /* Is this is an attribute revalidation, subject to softreval? */
115 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
116 task_flags |= RPC_TASK_TIMEOUT;
117
118 dprintk("NFS call getattr\n");
119 nfs_fattr_init(fattr);
120 status = rpc_call_sync(server->client, &msg, task_flags);
121 dprintk("NFS reply getattr: %d\n", status);
122 return status;
123}
124
125static int
126nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
127 struct iattr *sattr)
128{
129 struct inode *inode = d_inode(dentry);
130 struct nfs3_sattrargs arg = {
131 .fh = NFS_FH(inode),
132 .sattr = sattr,
133 };
134 struct rpc_message msg = {
135 .rpc_proc = &nfs3_procedures[NFS3PROC_SETATTR],
136 .rpc_argp = &arg,
137 .rpc_resp = fattr,
138 };
139 int status;
140
141 dprintk("NFS call setattr\n");
142 if (sattr->ia_valid & ATTR_FILE)
143 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
144 nfs_fattr_init(fattr);
145 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
146 if (status == 0) {
147 nfs_setattr_update_inode(inode, sattr, fattr);
148 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
149 nfs_zap_acl_cache(inode);
150 }
151 dprintk("NFS reply setattr: %d\n", status);
152 return status;
153}
154
155static int
156__nfs3_proc_lookup(struct inode *dir, const char *name, size_t len,
157 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
158 unsigned short task_flags)
159{
160 struct nfs3_diropargs arg = {
161 .fh = NFS_FH(dir),
162 .name = name,
163 .len = len
164 };
165 struct nfs3_diropres res = {
166 .fh = fhandle,
167 .fattr = fattr
168 };
169 struct rpc_message msg = {
170 .rpc_proc = &nfs3_procedures[NFS3PROC_LOOKUP],
171 .rpc_argp = &arg,
172 .rpc_resp = &res,
173 };
174 int status;
175
176 res.dir_attr = nfs_alloc_fattr();
177 if (res.dir_attr == NULL)
178 return -ENOMEM;
179
180 nfs_fattr_init(fattr);
181 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
182 nfs_refresh_inode(dir, res.dir_attr);
183 if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
184 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
185 msg.rpc_argp = fhandle;
186 msg.rpc_resp = fattr;
187 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
188 }
189 nfs_free_fattr(res.dir_attr);
190 dprintk("NFS reply lookup: %d\n", status);
191 return status;
192}
193
194static int
195nfs3_proc_lookup(struct inode *dir, struct dentry *dentry,
196 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
197{
198 unsigned short task_flags = 0;
199
200 /* Is this is an attribute revalidation, subject to softreval? */
201 if (nfs_lookup_is_soft_revalidate(dentry))
202 task_flags |= RPC_TASK_TIMEOUT;
203
204 dprintk("NFS call lookup %pd2\n", dentry);
205 return __nfs3_proc_lookup(dir, dentry->d_name.name,
206 dentry->d_name.len, fhandle, fattr,
207 task_flags);
208}
209
210static int nfs3_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
211 struct nfs_fattr *fattr)
212{
213 const char dotdot[] = "..";
214 const size_t len = strlen(dotdot);
215 unsigned short task_flags = 0;
216
217 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
218 task_flags |= RPC_TASK_TIMEOUT;
219
220 return __nfs3_proc_lookup(inode, dotdot, len, fhandle, fattr,
221 task_flags);
222}
223
224static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry,
225 const struct cred *cred)
226{
227 struct nfs3_accessargs arg = {
228 .fh = NFS_FH(inode),
229 .access = entry->mask,
230 };
231 struct nfs3_accessres res;
232 struct rpc_message msg = {
233 .rpc_proc = &nfs3_procedures[NFS3PROC_ACCESS],
234 .rpc_argp = &arg,
235 .rpc_resp = &res,
236 .rpc_cred = cred,
237 };
238 int status = -ENOMEM;
239
240 dprintk("NFS call access\n");
241 res.fattr = nfs_alloc_fattr();
242 if (res.fattr == NULL)
243 goto out;
244
245 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
246 nfs_refresh_inode(inode, res.fattr);
247 if (status == 0)
248 nfs_access_set_mask(entry, res.access);
249 nfs_free_fattr(res.fattr);
250out:
251 dprintk("NFS reply access: %d\n", status);
252 return status;
253}
254
255static int nfs3_proc_readlink(struct inode *inode, struct page *page,
256 unsigned int pgbase, unsigned int pglen)
257{
258 struct nfs_fattr *fattr;
259 struct nfs3_readlinkargs args = {
260 .fh = NFS_FH(inode),
261 .pgbase = pgbase,
262 .pglen = pglen,
263 .pages = &page
264 };
265 struct rpc_message msg = {
266 .rpc_proc = &nfs3_procedures[NFS3PROC_READLINK],
267 .rpc_argp = &args,
268 };
269 int status = -ENOMEM;
270
271 dprintk("NFS call readlink\n");
272 fattr = nfs_alloc_fattr();
273 if (fattr == NULL)
274 goto out;
275 msg.rpc_resp = fattr;
276
277 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
278 nfs_refresh_inode(inode, fattr);
279 nfs_free_fattr(fattr);
280out:
281 dprintk("NFS reply readlink: %d\n", status);
282 return status;
283}
284
285struct nfs3_createdata {
286 struct rpc_message msg;
287 union {
288 struct nfs3_createargs create;
289 struct nfs3_mkdirargs mkdir;
290 struct nfs3_symlinkargs symlink;
291 struct nfs3_mknodargs mknod;
292 } arg;
293 struct nfs3_diropres res;
294 struct nfs_fh fh;
295 struct nfs_fattr fattr;
296 struct nfs_fattr dir_attr;
297};
298
299static struct nfs3_createdata *nfs3_alloc_createdata(void)
300{
301 struct nfs3_createdata *data;
302
303 data = kzalloc(sizeof(*data), GFP_KERNEL);
304 if (data != NULL) {
305 data->msg.rpc_argp = &data->arg;
306 data->msg.rpc_resp = &data->res;
307 data->res.fh = &data->fh;
308 data->res.fattr = &data->fattr;
309 data->res.dir_attr = &data->dir_attr;
310 nfs_fattr_init(data->res.fattr);
311 nfs_fattr_init(data->res.dir_attr);
312 }
313 return data;
314}
315
316static struct dentry *
317nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
318{
319 int status;
320
321 status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
322 nfs_post_op_update_inode(dir, data->res.dir_attr);
323 if (status != 0)
324 return ERR_PTR(status);
325
326 return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr);
327}
328
329static void nfs3_free_createdata(struct nfs3_createdata *data)
330{
331 kfree(data);
332}
333
334/*
335 * Create a regular file.
336 */
337static int
338nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
339 int flags)
340{
341 struct posix_acl *default_acl, *acl;
342 struct nfs3_createdata *data;
343 struct dentry *d_alias;
344 int status = -ENOMEM;
345
346 dprintk("NFS call create %pd\n", dentry);
347
348 data = nfs3_alloc_createdata();
349 if (data == NULL)
350 goto out;
351
352 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
353 data->arg.create.fh = NFS_FH(dir);
354 data->arg.create.name = dentry->d_name.name;
355 data->arg.create.len = dentry->d_name.len;
356 data->arg.create.sattr = sattr;
357
358 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
359 if (flags & O_EXCL) {
360 data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE;
361 data->arg.create.verifier[0] = cpu_to_be32(jiffies);
362 data->arg.create.verifier[1] = cpu_to_be32(current->pid);
363 }
364
365 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
366 if (status)
367 goto out;
368
369 for (;;) {
370 d_alias = nfs3_do_create(dir, dentry, data);
371 status = PTR_ERR_OR_ZERO(d_alias);
372
373 if (status != -ENOTSUPP)
374 break;
375 /* If the server doesn't support the exclusive creation
376 * semantics, try again with simple 'guarded' mode. */
377 switch (data->arg.create.createmode) {
378 case NFS3_CREATE_EXCLUSIVE:
379 data->arg.create.createmode = NFS3_CREATE_GUARDED;
380 break;
381
382 case NFS3_CREATE_GUARDED:
383 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
384 break;
385
386 case NFS3_CREATE_UNCHECKED:
387 goto out_release_acls;
388 }
389 nfs_fattr_init(data->res.dir_attr);
390 nfs_fattr_init(data->res.fattr);
391 }
392
393 if (status != 0)
394 goto out_release_acls;
395
396 if (d_alias)
397 dentry = d_alias;
398
399 /* When we created the file with exclusive semantics, make
400 * sure we set the attributes afterwards. */
401 if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
402 dprintk("NFS call setattr (post-create)\n");
403
404 if (!(sattr->ia_valid & ATTR_ATIME_SET))
405 sattr->ia_valid |= ATTR_ATIME;
406 if (!(sattr->ia_valid & ATTR_MTIME_SET))
407 sattr->ia_valid |= ATTR_MTIME;
408
409 /* Note: we could use a guarded setattr here, but I'm
410 * not sure this buys us anything (and I'd have
411 * to revamp the NFSv3 XDR code) */
412 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
413 nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
414 dprintk("NFS reply setattr (post-create): %d\n", status);
415 if (status != 0)
416 goto out_dput;
417 }
418
419 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
420
421out_dput:
422 dput(d_alias);
423out_release_acls:
424 posix_acl_release(acl);
425 posix_acl_release(default_acl);
426out:
427 nfs3_free_createdata(data);
428 dprintk("NFS reply create: %d\n", status);
429 return status;
430}
431
432static int
433nfs3_proc_remove(struct inode *dir, struct dentry *dentry)
434{
435 struct nfs_removeargs arg = {
436 .fh = NFS_FH(dir),
437 .name = dentry->d_name,
438 };
439 struct nfs_removeres res;
440 struct rpc_message msg = {
441 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
442 .rpc_argp = &arg,
443 .rpc_resp = &res,
444 };
445 int status = -ENOMEM;
446
447 dprintk("NFS call remove %pd2\n", dentry);
448 res.dir_attr = nfs_alloc_fattr();
449 if (res.dir_attr == NULL)
450 goto out;
451
452 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
453 nfs_post_op_update_inode(dir, res.dir_attr);
454 nfs_free_fattr(res.dir_attr);
455out:
456 dprintk("NFS reply remove: %d\n", status);
457 return status;
458}
459
460static void
461nfs3_proc_unlink_setup(struct rpc_message *msg,
462 struct dentry *dentry,
463 struct inode *inode)
464{
465 msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
466}
467
468static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
469{
470 rpc_call_start(task);
471}
472
473static int
474nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
475{
476 struct nfs_removeres *res;
477 if (nfs3_async_handle_jukebox(task, dir))
478 return 0;
479 res = task->tk_msg.rpc_resp;
480 nfs_post_op_update_inode(dir, res->dir_attr);
481 return 1;
482}
483
484static void
485nfs3_proc_rename_setup(struct rpc_message *msg,
486 struct dentry *old_dentry,
487 struct dentry *new_dentry)
488{
489 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
490}
491
492static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
493{
494 rpc_call_start(task);
495}
496
497static int
498nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
499 struct inode *new_dir)
500{
501 struct nfs_renameres *res;
502
503 if (nfs3_async_handle_jukebox(task, old_dir))
504 return 0;
505 res = task->tk_msg.rpc_resp;
506
507 nfs_post_op_update_inode(old_dir, res->old_fattr);
508 nfs_post_op_update_inode(new_dir, res->new_fattr);
509 return 1;
510}
511
512static int
513nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
514{
515 struct nfs3_linkargs arg = {
516 .fromfh = NFS_FH(inode),
517 .tofh = NFS_FH(dir),
518 .toname = name->name,
519 .tolen = name->len
520 };
521 struct nfs3_linkres res;
522 struct rpc_message msg = {
523 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK],
524 .rpc_argp = &arg,
525 .rpc_resp = &res,
526 };
527 int status = -ENOMEM;
528
529 dprintk("NFS call link %s\n", name->name);
530 res.fattr = nfs_alloc_fattr();
531 res.dir_attr = nfs_alloc_fattr();
532 if (res.fattr == NULL || res.dir_attr == NULL)
533 goto out;
534
535 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
536 nfs_post_op_update_inode(dir, res.dir_attr);
537 nfs_post_op_update_inode(inode, res.fattr);
538out:
539 nfs_free_fattr(res.dir_attr);
540 nfs_free_fattr(res.fattr);
541 dprintk("NFS reply link: %d\n", status);
542 return status;
543}
544
545static int
546nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct folio *folio,
547 unsigned int len, struct iattr *sattr)
548{
549 struct page *page = &folio->page;
550 struct nfs3_createdata *data;
551 struct dentry *d_alias;
552 int status = -ENOMEM;
553
554 if (len > NFS3_MAXPATHLEN)
555 return -ENAMETOOLONG;
556
557 dprintk("NFS call symlink %pd\n", dentry);
558
559 data = nfs3_alloc_createdata();
560 if (data == NULL)
561 goto out;
562 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
563 data->arg.symlink.fromfh = NFS_FH(dir);
564 data->arg.symlink.fromname = dentry->d_name.name;
565 data->arg.symlink.fromlen = dentry->d_name.len;
566 data->arg.symlink.pages = &page;
567 data->arg.symlink.pathlen = len;
568 data->arg.symlink.sattr = sattr;
569
570 d_alias = nfs3_do_create(dir, dentry, data);
571 status = PTR_ERR_OR_ZERO(d_alias);
572
573 if (status == 0)
574 dput(d_alias);
575
576 nfs3_free_createdata(data);
577out:
578 dprintk("NFS reply symlink: %d\n", status);
579 return status;
580}
581
582static int
583nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
584{
585 struct posix_acl *default_acl, *acl;
586 struct nfs3_createdata *data;
587 struct dentry *d_alias;
588 int status = -ENOMEM;
589
590 dprintk("NFS call mkdir %pd\n", dentry);
591
592 data = nfs3_alloc_createdata();
593 if (data == NULL)
594 goto out;
595
596 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
597 if (status)
598 goto out;
599
600 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
601 data->arg.mkdir.fh = NFS_FH(dir);
602 data->arg.mkdir.name = dentry->d_name.name;
603 data->arg.mkdir.len = dentry->d_name.len;
604 data->arg.mkdir.sattr = sattr;
605
606 d_alias = nfs3_do_create(dir, dentry, data);
607 status = PTR_ERR_OR_ZERO(d_alias);
608
609 if (status != 0)
610 goto out_release_acls;
611
612 if (d_alias)
613 dentry = d_alias;
614
615 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
616
617 dput(d_alias);
618out_release_acls:
619 posix_acl_release(acl);
620 posix_acl_release(default_acl);
621out:
622 nfs3_free_createdata(data);
623 dprintk("NFS reply mkdir: %d\n", status);
624 return status;
625}
626
627static int
628nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
629{
630 struct nfs_fattr *dir_attr;
631 struct nfs3_diropargs arg = {
632 .fh = NFS_FH(dir),
633 .name = name->name,
634 .len = name->len
635 };
636 struct rpc_message msg = {
637 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
638 .rpc_argp = &arg,
639 };
640 int status = -ENOMEM;
641
642 dprintk("NFS call rmdir %s\n", name->name);
643 dir_attr = nfs_alloc_fattr();
644 if (dir_attr == NULL)
645 goto out;
646
647 msg.rpc_resp = dir_attr;
648 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
649 nfs_post_op_update_inode(dir, dir_attr);
650 nfs_free_fattr(dir_attr);
651out:
652 dprintk("NFS reply rmdir: %d\n", status);
653 return status;
654}
655
656/*
657 * The READDIR implementation is somewhat hackish - we pass the user buffer
658 * to the encode function, which installs it in the receive iovec.
659 * The decode function itself doesn't perform any decoding, it just makes
660 * sure the reply is syntactically correct.
661 *
662 * Also note that this implementation handles both plain readdir and
663 * readdirplus.
664 */
665static int nfs3_proc_readdir(struct nfs_readdir_arg *nr_arg,
666 struct nfs_readdir_res *nr_res)
667{
668 struct inode *dir = d_inode(nr_arg->dentry);
669 struct nfs3_readdirargs arg = {
670 .fh = NFS_FH(dir),
671 .cookie = nr_arg->cookie,
672 .plus = nr_arg->plus,
673 .count = nr_arg->page_len,
674 .pages = nr_arg->pages
675 };
676 struct nfs3_readdirres res = {
677 .verf = nr_res->verf,
678 .plus = nr_arg->plus,
679 };
680 struct rpc_message msg = {
681 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
682 .rpc_argp = &arg,
683 .rpc_resp = &res,
684 .rpc_cred = nr_arg->cred,
685 };
686 int status = -ENOMEM;
687
688 if (nr_arg->plus)
689 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
690 if (arg.cookie)
691 memcpy(arg.verf, nr_arg->verf, sizeof(arg.verf));
692
693 dprintk("NFS call readdir%s %llu\n", nr_arg->plus ? "plus" : "",
694 (unsigned long long)nr_arg->cookie);
695
696 res.dir_attr = nfs_alloc_fattr();
697 if (res.dir_attr == NULL)
698 goto out;
699
700 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
701
702 nfs_invalidate_atime(dir);
703 nfs_refresh_inode(dir, res.dir_attr);
704
705 nfs_free_fattr(res.dir_attr);
706out:
707 dprintk("NFS reply readdir%s: %d\n", nr_arg->plus ? "plus" : "",
708 status);
709 return status;
710}
711
712static int
713nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
714 dev_t rdev)
715{
716 struct posix_acl *default_acl, *acl;
717 struct nfs3_createdata *data;
718 struct dentry *d_alias;
719 int status = -ENOMEM;
720
721 dprintk("NFS call mknod %pd %u:%u\n", dentry,
722 MAJOR(rdev), MINOR(rdev));
723
724 data = nfs3_alloc_createdata();
725 if (data == NULL)
726 goto out;
727
728 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
729 if (status)
730 goto out;
731
732 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
733 data->arg.mknod.fh = NFS_FH(dir);
734 data->arg.mknod.name = dentry->d_name.name;
735 data->arg.mknod.len = dentry->d_name.len;
736 data->arg.mknod.sattr = sattr;
737 data->arg.mknod.rdev = rdev;
738
739 switch (sattr->ia_mode & S_IFMT) {
740 case S_IFBLK:
741 data->arg.mknod.type = NF3BLK;
742 break;
743 case S_IFCHR:
744 data->arg.mknod.type = NF3CHR;
745 break;
746 case S_IFIFO:
747 data->arg.mknod.type = NF3FIFO;
748 break;
749 case S_IFSOCK:
750 data->arg.mknod.type = NF3SOCK;
751 break;
752 default:
753 status = -EINVAL;
754 goto out_release_acls;
755 }
756
757 d_alias = nfs3_do_create(dir, dentry, data);
758 status = PTR_ERR_OR_ZERO(d_alias);
759 if (status != 0)
760 goto out_release_acls;
761
762 if (d_alias)
763 dentry = d_alias;
764
765 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
766
767 dput(d_alias);
768out_release_acls:
769 posix_acl_release(acl);
770 posix_acl_release(default_acl);
771out:
772 nfs3_free_createdata(data);
773 dprintk("NFS reply mknod: %d\n", status);
774 return status;
775}
776
777static int
778nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
779 struct nfs_fsstat *stat)
780{
781 struct rpc_message msg = {
782 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
783 .rpc_argp = fhandle,
784 .rpc_resp = stat,
785 };
786 int status;
787
788 dprintk("NFS call fsstat\n");
789 nfs_fattr_init(stat->fattr);
790 status = rpc_call_sync(server->client, &msg, 0);
791 dprintk("NFS reply fsstat: %d\n", status);
792 return status;
793}
794
795static int
796do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
797 struct nfs_fsinfo *info)
798{
799 struct rpc_message msg = {
800 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
801 .rpc_argp = fhandle,
802 .rpc_resp = info,
803 };
804 int status;
805
806 dprintk("NFS call fsinfo\n");
807 nfs_fattr_init(info->fattr);
808 status = rpc_call_sync(client, &msg, 0);
809 dprintk("NFS reply fsinfo: %d\n", status);
810 return status;
811}
812
813/*
814 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
815 * nfs_create_server
816 */
817static int
818nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
819 struct nfs_fsinfo *info)
820{
821 int status;
822
823 status = do_proc_fsinfo(server->client, fhandle, info);
824 if (status && server->nfs_client->cl_rpcclient != server->client)
825 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
826 return status;
827}
828
829static int
830nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
831 struct nfs_pathconf *info)
832{
833 struct rpc_message msg = {
834 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
835 .rpc_argp = fhandle,
836 .rpc_resp = info,
837 };
838 int status;
839
840 dprintk("NFS call pathconf\n");
841 nfs_fattr_init(info->fattr);
842 status = rpc_call_sync(server->client, &msg, 0);
843 dprintk("NFS reply pathconf: %d\n", status);
844 return status;
845}
846
847static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
848{
849 struct inode *inode = hdr->inode;
850 struct nfs_server *server = NFS_SERVER(inode);
851
852 if (hdr->pgio_done_cb != NULL)
853 return hdr->pgio_done_cb(task, hdr);
854
855 if (nfs3_async_handle_jukebox(task, inode))
856 return -EAGAIN;
857
858 if (task->tk_status >= 0 && !server->read_hdrsize)
859 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
860
861 nfs_invalidate_atime(inode);
862 nfs_refresh_inode(inode, &hdr->fattr);
863 return 0;
864}
865
866static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
867 struct rpc_message *msg)
868{
869 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
870 hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
871}
872
873static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
874 struct nfs_pgio_header *hdr)
875{
876 rpc_call_start(task);
877 return 0;
878}
879
880static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
881{
882 struct inode *inode = hdr->inode;
883
884 if (hdr->pgio_done_cb != NULL)
885 return hdr->pgio_done_cb(task, hdr);
886
887 if (nfs3_async_handle_jukebox(task, inode))
888 return -EAGAIN;
889 if (task->tk_status >= 0)
890 nfs_writeback_update_inode(hdr);
891 return 0;
892}
893
894static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
895 struct rpc_message *msg,
896 struct rpc_clnt **clnt)
897{
898 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
899}
900
901static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
902{
903 rpc_call_start(task);
904}
905
906static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
907{
908 if (data->commit_done_cb != NULL)
909 return data->commit_done_cb(task, data);
910
911 if (nfs3_async_handle_jukebox(task, data->inode))
912 return -EAGAIN;
913 nfs_refresh_inode(data->inode, data->res.fattr);
914 return 0;
915}
916
917static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
918 struct rpc_clnt **clnt)
919{
920 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
921}
922
923static void nfs3_nlm_alloc_call(void *data)
924{
925 struct nfs_lock_context *l_ctx = data;
926 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
927 get_nfs_open_context(l_ctx->open_context);
928 nfs_get_lock_context(l_ctx->open_context);
929 }
930}
931
932static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
933{
934 struct nfs_lock_context *l_ctx = data;
935 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
936 return nfs_async_iocounter_wait(task, l_ctx);
937 return false;
938
939}
940
941static void nfs3_nlm_release_call(void *data)
942{
943 struct nfs_lock_context *l_ctx = data;
944 struct nfs_open_context *ctx;
945 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
946 ctx = l_ctx->open_context;
947 nfs_put_lock_context(l_ctx);
948 put_nfs_open_context(ctx);
949 }
950}
951
952static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
953 .nlmclnt_alloc_call = nfs3_nlm_alloc_call,
954 .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
955 .nlmclnt_release_call = nfs3_nlm_release_call,
956};
957
958static int
959nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
960{
961 struct inode *inode = file_inode(filp);
962 struct nfs_lock_context *l_ctx = NULL;
963 struct nfs_open_context *ctx = nfs_file_open_context(filp);
964 int status;
965
966 if (fl->fl_flags & FL_CLOSE) {
967 l_ctx = nfs_get_lock_context(ctx);
968 if (IS_ERR(l_ctx))
969 l_ctx = NULL;
970 else
971 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
972 }
973
974 status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
975
976 if (l_ctx)
977 nfs_put_lock_context(l_ctx);
978
979 return status;
980}
981
982static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
983{
984 return 0;
985}
986
987static const struct inode_operations nfs3_dir_inode_operations = {
988 .create = nfs_create,
989 .lookup = nfs_lookup,
990 .link = nfs_link,
991 .unlink = nfs_unlink,
992 .symlink = nfs_symlink,
993 .mkdir = nfs_mkdir,
994 .rmdir = nfs_rmdir,
995 .mknod = nfs_mknod,
996 .rename = nfs_rename,
997 .permission = nfs_permission,
998 .getattr = nfs_getattr,
999 .setattr = nfs_setattr,
1000#ifdef CONFIG_NFS_V3_ACL
1001 .listxattr = nfs3_listxattr,
1002 .get_inode_acl = nfs3_get_acl,
1003 .set_acl = nfs3_set_acl,
1004#endif
1005};
1006
1007static const struct inode_operations nfs3_file_inode_operations = {
1008 .permission = nfs_permission,
1009 .getattr = nfs_getattr,
1010 .setattr = nfs_setattr,
1011#ifdef CONFIG_NFS_V3_ACL
1012 .listxattr = nfs3_listxattr,
1013 .get_inode_acl = nfs3_get_acl,
1014 .set_acl = nfs3_set_acl,
1015#endif
1016};
1017
1018const struct nfs_rpc_ops nfs_v3_clientops = {
1019 .version = 3, /* protocol version */
1020 .dentry_ops = &nfs_dentry_operations,
1021 .dir_inode_ops = &nfs3_dir_inode_operations,
1022 .file_inode_ops = &nfs3_file_inode_operations,
1023 .file_ops = &nfs_file_operations,
1024 .nlmclnt_ops = &nlmclnt_fl_close_lock_ops,
1025 .getroot = nfs3_proc_get_root,
1026 .submount = nfs_submount,
1027 .try_get_tree = nfs_try_get_tree,
1028 .getattr = nfs3_proc_getattr,
1029 .setattr = nfs3_proc_setattr,
1030 .lookup = nfs3_proc_lookup,
1031 .lookupp = nfs3_proc_lookupp,
1032 .access = nfs3_proc_access,
1033 .readlink = nfs3_proc_readlink,
1034 .create = nfs3_proc_create,
1035 .remove = nfs3_proc_remove,
1036 .unlink_setup = nfs3_proc_unlink_setup,
1037 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1038 .unlink_done = nfs3_proc_unlink_done,
1039 .rename_setup = nfs3_proc_rename_setup,
1040 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1041 .rename_done = nfs3_proc_rename_done,
1042 .link = nfs3_proc_link,
1043 .symlink = nfs3_proc_symlink,
1044 .mkdir = nfs3_proc_mkdir,
1045 .rmdir = nfs3_proc_rmdir,
1046 .readdir = nfs3_proc_readdir,
1047 .mknod = nfs3_proc_mknod,
1048 .statfs = nfs3_proc_statfs,
1049 .fsinfo = nfs3_proc_fsinfo,
1050 .pathconf = nfs3_proc_pathconf,
1051 .decode_dirent = nfs3_decode_dirent,
1052 .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1053 .read_setup = nfs3_proc_read_setup,
1054 .read_done = nfs3_read_done,
1055 .write_setup = nfs3_proc_write_setup,
1056 .write_done = nfs3_write_done,
1057 .commit_setup = nfs3_proc_commit_setup,
1058 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1059 .commit_done = nfs3_commit_done,
1060 .lock = nfs3_proc_lock,
1061 .clear_acl_cache = forget_all_cached_acls,
1062 .close_context = nfs_close_context,
1063 .have_delegation = nfs3_have_delegation,
1064 .alloc_client = nfs_alloc_client,
1065 .init_client = nfs_init_client,
1066 .free_client = nfs_free_client,
1067 .create_server = nfs3_create_server,
1068 .clone_server = nfs3_clone_server,
1069};
1/*
2 * linux/fs/nfs/nfs3proc.c
3 *
4 * Client-side NFSv3 procedures stubs.
5 *
6 * Copyright (C) 1997, Olaf Kirch
7 */
8
9#include <linux/mm.h>
10#include <linux/errno.h>
11#include <linux/string.h>
12#include <linux/sunrpc/clnt.h>
13#include <linux/slab.h>
14#include <linux/nfs.h>
15#include <linux/nfs3.h>
16#include <linux/nfs_fs.h>
17#include <linux/nfs_page.h>
18#include <linux/lockd/bind.h>
19#include <linux/nfs_mount.h>
20#include <linux/freezer.h>
21
22#include "iostat.h"
23#include "internal.h"
24
25#define NFSDBG_FACILITY NFSDBG_PROC
26
27/* A wrapper to handle the EJUKEBOX and EKEYEXPIRED error messages */
28static int
29nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
30{
31 int res;
32 do {
33 res = rpc_call_sync(clnt, msg, flags);
34 if (res != -EJUKEBOX && res != -EKEYEXPIRED)
35 break;
36 freezable_schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
37 res = -ERESTARTSYS;
38 } while (!fatal_signal_pending(current));
39 return res;
40}
41
42#define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
43
44static int
45nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
46{
47 if (task->tk_status != -EJUKEBOX && task->tk_status != -EKEYEXPIRED)
48 return 0;
49 if (task->tk_status == -EJUKEBOX)
50 nfs_inc_stats(inode, NFSIOS_DELAY);
51 task->tk_status = 0;
52 rpc_restart_call(task);
53 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
54 return 1;
55}
56
57static int
58do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle,
59 struct nfs_fsinfo *info)
60{
61 struct rpc_message msg = {
62 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
63 .rpc_argp = fhandle,
64 .rpc_resp = info,
65 };
66 int status;
67
68 dprintk("%s: call fsinfo\n", __func__);
69 nfs_fattr_init(info->fattr);
70 status = rpc_call_sync(client, &msg, 0);
71 dprintk("%s: reply fsinfo: %d\n", __func__, status);
72 if (status == 0 && !(info->fattr->valid & NFS_ATTR_FATTR)) {
73 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
74 msg.rpc_resp = info->fattr;
75 status = rpc_call_sync(client, &msg, 0);
76 dprintk("%s: reply getattr: %d\n", __func__, status);
77 }
78 return status;
79}
80
81/*
82 * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb
83 */
84static int
85nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
86 struct nfs_fsinfo *info)
87{
88 int status;
89
90 status = do_proc_get_root(server->client, fhandle, info);
91 if (status && server->nfs_client->cl_rpcclient != server->client)
92 status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info);
93 return status;
94}
95
96/*
97 * One function for each procedure in the NFS protocol.
98 */
99static int
100nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
101 struct nfs_fattr *fattr)
102{
103 struct rpc_message msg = {
104 .rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR],
105 .rpc_argp = fhandle,
106 .rpc_resp = fattr,
107 };
108 int status;
109
110 dprintk("NFS call getattr\n");
111 nfs_fattr_init(fattr);
112 status = rpc_call_sync(server->client, &msg, 0);
113 dprintk("NFS reply getattr: %d\n", status);
114 return status;
115}
116
117static int
118nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
119 struct iattr *sattr)
120{
121 struct inode *inode = dentry->d_inode;
122 struct nfs3_sattrargs arg = {
123 .fh = NFS_FH(inode),
124 .sattr = sattr,
125 };
126 struct rpc_message msg = {
127 .rpc_proc = &nfs3_procedures[NFS3PROC_SETATTR],
128 .rpc_argp = &arg,
129 .rpc_resp = fattr,
130 };
131 int status;
132
133 dprintk("NFS call setattr\n");
134 if (sattr->ia_valid & ATTR_FILE)
135 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
136 nfs_fattr_init(fattr);
137 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
138 if (status == 0)
139 nfs_setattr_update_inode(inode, sattr);
140 dprintk("NFS reply setattr: %d\n", status);
141 return status;
142}
143
144static int
145nfs3_proc_lookup(struct inode *dir, struct qstr *name,
146 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
147{
148 struct nfs3_diropargs arg = {
149 .fh = NFS_FH(dir),
150 .name = name->name,
151 .len = name->len
152 };
153 struct nfs3_diropres res = {
154 .fh = fhandle,
155 .fattr = fattr
156 };
157 struct rpc_message msg = {
158 .rpc_proc = &nfs3_procedures[NFS3PROC_LOOKUP],
159 .rpc_argp = &arg,
160 .rpc_resp = &res,
161 };
162 int status;
163
164 dprintk("NFS call lookup %s\n", name->name);
165 res.dir_attr = nfs_alloc_fattr();
166 if (res.dir_attr == NULL)
167 return -ENOMEM;
168
169 nfs_fattr_init(fattr);
170 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
171 nfs_refresh_inode(dir, res.dir_attr);
172 if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
173 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
174 msg.rpc_argp = fhandle;
175 msg.rpc_resp = fattr;
176 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
177 }
178 nfs_free_fattr(res.dir_attr);
179 dprintk("NFS reply lookup: %d\n", status);
180 return status;
181}
182
183static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
184{
185 struct nfs3_accessargs arg = {
186 .fh = NFS_FH(inode),
187 };
188 struct nfs3_accessres res;
189 struct rpc_message msg = {
190 .rpc_proc = &nfs3_procedures[NFS3PROC_ACCESS],
191 .rpc_argp = &arg,
192 .rpc_resp = &res,
193 .rpc_cred = entry->cred,
194 };
195 int mode = entry->mask;
196 int status = -ENOMEM;
197
198 dprintk("NFS call access\n");
199
200 if (mode & MAY_READ)
201 arg.access |= NFS3_ACCESS_READ;
202 if (S_ISDIR(inode->i_mode)) {
203 if (mode & MAY_WRITE)
204 arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE;
205 if (mode & MAY_EXEC)
206 arg.access |= NFS3_ACCESS_LOOKUP;
207 } else {
208 if (mode & MAY_WRITE)
209 arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND;
210 if (mode & MAY_EXEC)
211 arg.access |= NFS3_ACCESS_EXECUTE;
212 }
213
214 res.fattr = nfs_alloc_fattr();
215 if (res.fattr == NULL)
216 goto out;
217
218 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
219 nfs_refresh_inode(inode, res.fattr);
220 if (status == 0) {
221 entry->mask = 0;
222 if (res.access & NFS3_ACCESS_READ)
223 entry->mask |= MAY_READ;
224 if (res.access & (NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE))
225 entry->mask |= MAY_WRITE;
226 if (res.access & (NFS3_ACCESS_LOOKUP|NFS3_ACCESS_EXECUTE))
227 entry->mask |= MAY_EXEC;
228 }
229 nfs_free_fattr(res.fattr);
230out:
231 dprintk("NFS reply access: %d\n", status);
232 return status;
233}
234
235static int nfs3_proc_readlink(struct inode *inode, struct page *page,
236 unsigned int pgbase, unsigned int pglen)
237{
238 struct nfs_fattr *fattr;
239 struct nfs3_readlinkargs args = {
240 .fh = NFS_FH(inode),
241 .pgbase = pgbase,
242 .pglen = pglen,
243 .pages = &page
244 };
245 struct rpc_message msg = {
246 .rpc_proc = &nfs3_procedures[NFS3PROC_READLINK],
247 .rpc_argp = &args,
248 };
249 int status = -ENOMEM;
250
251 dprintk("NFS call readlink\n");
252 fattr = nfs_alloc_fattr();
253 if (fattr == NULL)
254 goto out;
255 msg.rpc_resp = fattr;
256
257 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
258 nfs_refresh_inode(inode, fattr);
259 nfs_free_fattr(fattr);
260out:
261 dprintk("NFS reply readlink: %d\n", status);
262 return status;
263}
264
265struct nfs3_createdata {
266 struct rpc_message msg;
267 union {
268 struct nfs3_createargs create;
269 struct nfs3_mkdirargs mkdir;
270 struct nfs3_symlinkargs symlink;
271 struct nfs3_mknodargs mknod;
272 } arg;
273 struct nfs3_diropres res;
274 struct nfs_fh fh;
275 struct nfs_fattr fattr;
276 struct nfs_fattr dir_attr;
277};
278
279static struct nfs3_createdata *nfs3_alloc_createdata(void)
280{
281 struct nfs3_createdata *data;
282
283 data = kzalloc(sizeof(*data), GFP_KERNEL);
284 if (data != NULL) {
285 data->msg.rpc_argp = &data->arg;
286 data->msg.rpc_resp = &data->res;
287 data->res.fh = &data->fh;
288 data->res.fattr = &data->fattr;
289 data->res.dir_attr = &data->dir_attr;
290 nfs_fattr_init(data->res.fattr);
291 nfs_fattr_init(data->res.dir_attr);
292 }
293 return data;
294}
295
296static int nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
297{
298 int status;
299
300 status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
301 nfs_post_op_update_inode(dir, data->res.dir_attr);
302 if (status == 0)
303 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
304 return status;
305}
306
307static void nfs3_free_createdata(struct nfs3_createdata *data)
308{
309 kfree(data);
310}
311
312/*
313 * Create a regular file.
314 */
315static int
316nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
317 int flags, struct nfs_open_context *ctx)
318{
319 struct nfs3_createdata *data;
320 umode_t mode = sattr->ia_mode;
321 int status = -ENOMEM;
322
323 dprintk("NFS call create %s\n", dentry->d_name.name);
324
325 data = nfs3_alloc_createdata();
326 if (data == NULL)
327 goto out;
328
329 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
330 data->arg.create.fh = NFS_FH(dir);
331 data->arg.create.name = dentry->d_name.name;
332 data->arg.create.len = dentry->d_name.len;
333 data->arg.create.sattr = sattr;
334
335 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
336 if (flags & O_EXCL) {
337 data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE;
338 data->arg.create.verifier[0] = jiffies;
339 data->arg.create.verifier[1] = current->pid;
340 }
341
342 sattr->ia_mode &= ~current_umask();
343
344 for (;;) {
345 status = nfs3_do_create(dir, dentry, data);
346
347 if (status != -ENOTSUPP)
348 break;
349 /* If the server doesn't support the exclusive creation
350 * semantics, try again with simple 'guarded' mode. */
351 switch (data->arg.create.createmode) {
352 case NFS3_CREATE_EXCLUSIVE:
353 data->arg.create.createmode = NFS3_CREATE_GUARDED;
354 break;
355
356 case NFS3_CREATE_GUARDED:
357 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
358 break;
359
360 case NFS3_CREATE_UNCHECKED:
361 goto out;
362 }
363 nfs_fattr_init(data->res.dir_attr);
364 nfs_fattr_init(data->res.fattr);
365 }
366
367 if (status != 0)
368 goto out;
369
370 /* When we created the file with exclusive semantics, make
371 * sure we set the attributes afterwards. */
372 if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
373 dprintk("NFS call setattr (post-create)\n");
374
375 if (!(sattr->ia_valid & ATTR_ATIME_SET))
376 sattr->ia_valid |= ATTR_ATIME;
377 if (!(sattr->ia_valid & ATTR_MTIME_SET))
378 sattr->ia_valid |= ATTR_MTIME;
379
380 /* Note: we could use a guarded setattr here, but I'm
381 * not sure this buys us anything (and I'd have
382 * to revamp the NFSv3 XDR code) */
383 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
384 nfs_post_op_update_inode(dentry->d_inode, data->res.fattr);
385 dprintk("NFS reply setattr (post-create): %d\n", status);
386 if (status != 0)
387 goto out;
388 }
389 status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
390out:
391 nfs3_free_createdata(data);
392 dprintk("NFS reply create: %d\n", status);
393 return status;
394}
395
396static int
397nfs3_proc_remove(struct inode *dir, struct qstr *name)
398{
399 struct nfs_removeargs arg = {
400 .fh = NFS_FH(dir),
401 .name = *name,
402 };
403 struct nfs_removeres res;
404 struct rpc_message msg = {
405 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
406 .rpc_argp = &arg,
407 .rpc_resp = &res,
408 };
409 int status = -ENOMEM;
410
411 dprintk("NFS call remove %s\n", name->name);
412 res.dir_attr = nfs_alloc_fattr();
413 if (res.dir_attr == NULL)
414 goto out;
415
416 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
417 nfs_post_op_update_inode(dir, res.dir_attr);
418 nfs_free_fattr(res.dir_attr);
419out:
420 dprintk("NFS reply remove: %d\n", status);
421 return status;
422}
423
424static void
425nfs3_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
426{
427 msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
428}
429
430static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
431{
432 rpc_call_start(task);
433}
434
435static int
436nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
437{
438 struct nfs_removeres *res;
439 if (nfs3_async_handle_jukebox(task, dir))
440 return 0;
441 res = task->tk_msg.rpc_resp;
442 nfs_post_op_update_inode(dir, res->dir_attr);
443 return 1;
444}
445
446static void
447nfs3_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
448{
449 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
450}
451
452static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
453{
454 rpc_call_start(task);
455}
456
457static int
458nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
459 struct inode *new_dir)
460{
461 struct nfs_renameres *res;
462
463 if (nfs3_async_handle_jukebox(task, old_dir))
464 return 0;
465 res = task->tk_msg.rpc_resp;
466
467 nfs_post_op_update_inode(old_dir, res->old_fattr);
468 nfs_post_op_update_inode(new_dir, res->new_fattr);
469 return 1;
470}
471
472static int
473nfs3_proc_rename(struct inode *old_dir, struct qstr *old_name,
474 struct inode *new_dir, struct qstr *new_name)
475{
476 struct nfs_renameargs arg = {
477 .old_dir = NFS_FH(old_dir),
478 .old_name = old_name,
479 .new_dir = NFS_FH(new_dir),
480 .new_name = new_name,
481 };
482 struct nfs_renameres res;
483 struct rpc_message msg = {
484 .rpc_proc = &nfs3_procedures[NFS3PROC_RENAME],
485 .rpc_argp = &arg,
486 .rpc_resp = &res,
487 };
488 int status = -ENOMEM;
489
490 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
491
492 res.old_fattr = nfs_alloc_fattr();
493 res.new_fattr = nfs_alloc_fattr();
494 if (res.old_fattr == NULL || res.new_fattr == NULL)
495 goto out;
496
497 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
498 nfs_post_op_update_inode(old_dir, res.old_fattr);
499 nfs_post_op_update_inode(new_dir, res.new_fattr);
500out:
501 nfs_free_fattr(res.old_fattr);
502 nfs_free_fattr(res.new_fattr);
503 dprintk("NFS reply rename: %d\n", status);
504 return status;
505}
506
507static int
508nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
509{
510 struct nfs3_linkargs arg = {
511 .fromfh = NFS_FH(inode),
512 .tofh = NFS_FH(dir),
513 .toname = name->name,
514 .tolen = name->len
515 };
516 struct nfs3_linkres res;
517 struct rpc_message msg = {
518 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK],
519 .rpc_argp = &arg,
520 .rpc_resp = &res,
521 };
522 int status = -ENOMEM;
523
524 dprintk("NFS call link %s\n", name->name);
525 res.fattr = nfs_alloc_fattr();
526 res.dir_attr = nfs_alloc_fattr();
527 if (res.fattr == NULL || res.dir_attr == NULL)
528 goto out;
529
530 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
531 nfs_post_op_update_inode(dir, res.dir_attr);
532 nfs_post_op_update_inode(inode, res.fattr);
533out:
534 nfs_free_fattr(res.dir_attr);
535 nfs_free_fattr(res.fattr);
536 dprintk("NFS reply link: %d\n", status);
537 return status;
538}
539
540static int
541nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
542 unsigned int len, struct iattr *sattr)
543{
544 struct nfs3_createdata *data;
545 int status = -ENOMEM;
546
547 if (len > NFS3_MAXPATHLEN)
548 return -ENAMETOOLONG;
549
550 dprintk("NFS call symlink %s\n", dentry->d_name.name);
551
552 data = nfs3_alloc_createdata();
553 if (data == NULL)
554 goto out;
555 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
556 data->arg.symlink.fromfh = NFS_FH(dir);
557 data->arg.symlink.fromname = dentry->d_name.name;
558 data->arg.symlink.fromlen = dentry->d_name.len;
559 data->arg.symlink.pages = &page;
560 data->arg.symlink.pathlen = len;
561 data->arg.symlink.sattr = sattr;
562
563 status = nfs3_do_create(dir, dentry, data);
564
565 nfs3_free_createdata(data);
566out:
567 dprintk("NFS reply symlink: %d\n", status);
568 return status;
569}
570
571static int
572nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
573{
574 struct nfs3_createdata *data;
575 umode_t mode = sattr->ia_mode;
576 int status = -ENOMEM;
577
578 dprintk("NFS call mkdir %s\n", dentry->d_name.name);
579
580 sattr->ia_mode &= ~current_umask();
581
582 data = nfs3_alloc_createdata();
583 if (data == NULL)
584 goto out;
585
586 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
587 data->arg.mkdir.fh = NFS_FH(dir);
588 data->arg.mkdir.name = dentry->d_name.name;
589 data->arg.mkdir.len = dentry->d_name.len;
590 data->arg.mkdir.sattr = sattr;
591
592 status = nfs3_do_create(dir, dentry, data);
593 if (status != 0)
594 goto out;
595
596 status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
597out:
598 nfs3_free_createdata(data);
599 dprintk("NFS reply mkdir: %d\n", status);
600 return status;
601}
602
603static int
604nfs3_proc_rmdir(struct inode *dir, struct qstr *name)
605{
606 struct nfs_fattr *dir_attr;
607 struct nfs3_diropargs arg = {
608 .fh = NFS_FH(dir),
609 .name = name->name,
610 .len = name->len
611 };
612 struct rpc_message msg = {
613 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
614 .rpc_argp = &arg,
615 };
616 int status = -ENOMEM;
617
618 dprintk("NFS call rmdir %s\n", name->name);
619 dir_attr = nfs_alloc_fattr();
620 if (dir_attr == NULL)
621 goto out;
622
623 msg.rpc_resp = dir_attr;
624 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
625 nfs_post_op_update_inode(dir, dir_attr);
626 nfs_free_fattr(dir_attr);
627out:
628 dprintk("NFS reply rmdir: %d\n", status);
629 return status;
630}
631
632/*
633 * The READDIR implementation is somewhat hackish - we pass the user buffer
634 * to the encode function, which installs it in the receive iovec.
635 * The decode function itself doesn't perform any decoding, it just makes
636 * sure the reply is syntactically correct.
637 *
638 * Also note that this implementation handles both plain readdir and
639 * readdirplus.
640 */
641static int
642nfs3_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
643 u64 cookie, struct page **pages, unsigned int count, int plus)
644{
645 struct inode *dir = dentry->d_inode;
646 __be32 *verf = NFS_I(dir)->cookieverf;
647 struct nfs3_readdirargs arg = {
648 .fh = NFS_FH(dir),
649 .cookie = cookie,
650 .verf = {verf[0], verf[1]},
651 .plus = plus,
652 .count = count,
653 .pages = pages
654 };
655 struct nfs3_readdirres res = {
656 .verf = verf,
657 .plus = plus
658 };
659 struct rpc_message msg = {
660 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
661 .rpc_argp = &arg,
662 .rpc_resp = &res,
663 .rpc_cred = cred
664 };
665 int status = -ENOMEM;
666
667 if (plus)
668 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
669
670 dprintk("NFS call readdir%s %d\n",
671 plus? "plus" : "", (unsigned int) cookie);
672
673 res.dir_attr = nfs_alloc_fattr();
674 if (res.dir_attr == NULL)
675 goto out;
676
677 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
678
679 nfs_invalidate_atime(dir);
680 nfs_refresh_inode(dir, res.dir_attr);
681
682 nfs_free_fattr(res.dir_attr);
683out:
684 dprintk("NFS reply readdir%s: %d\n",
685 plus? "plus" : "", status);
686 return status;
687}
688
689static int
690nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
691 dev_t rdev)
692{
693 struct nfs3_createdata *data;
694 umode_t mode = sattr->ia_mode;
695 int status = -ENOMEM;
696
697 dprintk("NFS call mknod %s %u:%u\n", dentry->d_name.name,
698 MAJOR(rdev), MINOR(rdev));
699
700 sattr->ia_mode &= ~current_umask();
701
702 data = nfs3_alloc_createdata();
703 if (data == NULL)
704 goto out;
705
706 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
707 data->arg.mknod.fh = NFS_FH(dir);
708 data->arg.mknod.name = dentry->d_name.name;
709 data->arg.mknod.len = dentry->d_name.len;
710 data->arg.mknod.sattr = sattr;
711 data->arg.mknod.rdev = rdev;
712
713 switch (sattr->ia_mode & S_IFMT) {
714 case S_IFBLK:
715 data->arg.mknod.type = NF3BLK;
716 break;
717 case S_IFCHR:
718 data->arg.mknod.type = NF3CHR;
719 break;
720 case S_IFIFO:
721 data->arg.mknod.type = NF3FIFO;
722 break;
723 case S_IFSOCK:
724 data->arg.mknod.type = NF3SOCK;
725 break;
726 default:
727 status = -EINVAL;
728 goto out;
729 }
730
731 status = nfs3_do_create(dir, dentry, data);
732 if (status != 0)
733 goto out;
734 status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
735out:
736 nfs3_free_createdata(data);
737 dprintk("NFS reply mknod: %d\n", status);
738 return status;
739}
740
741static int
742nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
743 struct nfs_fsstat *stat)
744{
745 struct rpc_message msg = {
746 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
747 .rpc_argp = fhandle,
748 .rpc_resp = stat,
749 };
750 int status;
751
752 dprintk("NFS call fsstat\n");
753 nfs_fattr_init(stat->fattr);
754 status = rpc_call_sync(server->client, &msg, 0);
755 dprintk("NFS reply fsstat: %d\n", status);
756 return status;
757}
758
759static int
760do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
761 struct nfs_fsinfo *info)
762{
763 struct rpc_message msg = {
764 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
765 .rpc_argp = fhandle,
766 .rpc_resp = info,
767 };
768 int status;
769
770 dprintk("NFS call fsinfo\n");
771 nfs_fattr_init(info->fattr);
772 status = rpc_call_sync(client, &msg, 0);
773 dprintk("NFS reply fsinfo: %d\n", status);
774 return status;
775}
776
777/*
778 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
779 * nfs_create_server
780 */
781static int
782nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
783 struct nfs_fsinfo *info)
784{
785 int status;
786
787 status = do_proc_fsinfo(server->client, fhandle, info);
788 if (status && server->nfs_client->cl_rpcclient != server->client)
789 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
790 return status;
791}
792
793static int
794nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
795 struct nfs_pathconf *info)
796{
797 struct rpc_message msg = {
798 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
799 .rpc_argp = fhandle,
800 .rpc_resp = info,
801 };
802 int status;
803
804 dprintk("NFS call pathconf\n");
805 nfs_fattr_init(info->fattr);
806 status = rpc_call_sync(server->client, &msg, 0);
807 dprintk("NFS reply pathconf: %d\n", status);
808 return status;
809}
810
811static int nfs3_read_done(struct rpc_task *task, struct nfs_read_data *data)
812{
813 struct inode *inode = data->header->inode;
814
815 if (nfs3_async_handle_jukebox(task, inode))
816 return -EAGAIN;
817
818 nfs_invalidate_atime(inode);
819 nfs_refresh_inode(inode, &data->fattr);
820 return 0;
821}
822
823static void nfs3_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
824{
825 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
826}
827
828static void nfs3_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
829{
830 rpc_call_start(task);
831}
832
833static int nfs3_write_done(struct rpc_task *task, struct nfs_write_data *data)
834{
835 struct inode *inode = data->header->inode;
836
837 if (nfs3_async_handle_jukebox(task, inode))
838 return -EAGAIN;
839 if (task->tk_status >= 0)
840 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
841 return 0;
842}
843
844static void nfs3_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
845{
846 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
847}
848
849static void nfs3_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
850{
851 rpc_call_start(task);
852}
853
854static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
855{
856 rpc_call_start(task);
857}
858
859static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
860{
861 if (nfs3_async_handle_jukebox(task, data->inode))
862 return -EAGAIN;
863 nfs_refresh_inode(data->inode, data->res.fattr);
864 return 0;
865}
866
867static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
868{
869 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
870}
871
872static int
873nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
874{
875 struct inode *inode = filp->f_path.dentry->d_inode;
876
877 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
878}
879
880const struct nfs_rpc_ops nfs_v3_clientops = {
881 .version = 3, /* protocol version */
882 .dentry_ops = &nfs_dentry_operations,
883 .dir_inode_ops = &nfs3_dir_inode_operations,
884 .file_inode_ops = &nfs3_file_inode_operations,
885 .file_ops = &nfs_file_operations,
886 .getroot = nfs3_proc_get_root,
887 .submount = nfs_submount,
888 .getattr = nfs3_proc_getattr,
889 .setattr = nfs3_proc_setattr,
890 .lookup = nfs3_proc_lookup,
891 .access = nfs3_proc_access,
892 .readlink = nfs3_proc_readlink,
893 .create = nfs3_proc_create,
894 .remove = nfs3_proc_remove,
895 .unlink_setup = nfs3_proc_unlink_setup,
896 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
897 .unlink_done = nfs3_proc_unlink_done,
898 .rename = nfs3_proc_rename,
899 .rename_setup = nfs3_proc_rename_setup,
900 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
901 .rename_done = nfs3_proc_rename_done,
902 .link = nfs3_proc_link,
903 .symlink = nfs3_proc_symlink,
904 .mkdir = nfs3_proc_mkdir,
905 .rmdir = nfs3_proc_rmdir,
906 .readdir = nfs3_proc_readdir,
907 .mknod = nfs3_proc_mknod,
908 .statfs = nfs3_proc_statfs,
909 .fsinfo = nfs3_proc_fsinfo,
910 .pathconf = nfs3_proc_pathconf,
911 .decode_dirent = nfs3_decode_dirent,
912 .read_setup = nfs3_proc_read_setup,
913 .read_rpc_prepare = nfs3_proc_read_rpc_prepare,
914 .read_done = nfs3_read_done,
915 .write_setup = nfs3_proc_write_setup,
916 .write_rpc_prepare = nfs3_proc_write_rpc_prepare,
917 .write_done = nfs3_write_done,
918 .commit_setup = nfs3_proc_commit_setup,
919 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
920 .commit_done = nfs3_commit_done,
921 .lock = nfs3_proc_lock,
922 .clear_acl_cache = nfs3_forget_cached_acls,
923 .close_context = nfs_close_context,
924 .init_client = nfs_init_client,
925};