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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 page *page,
547 unsigned int len, struct iattr *sattr)
548{
549 struct nfs3_createdata *data;
550 struct dentry *d_alias;
551 int status = -ENOMEM;
552
553 if (len > NFS3_MAXPATHLEN)
554 return -ENAMETOOLONG;
555
556 dprintk("NFS call symlink %pd\n", dentry);
557
558 data = nfs3_alloc_createdata();
559 if (data == NULL)
560 goto out;
561 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
562 data->arg.symlink.fromfh = NFS_FH(dir);
563 data->arg.symlink.fromname = dentry->d_name.name;
564 data->arg.symlink.fromlen = dentry->d_name.len;
565 data->arg.symlink.pages = &page;
566 data->arg.symlink.pathlen = len;
567 data->arg.symlink.sattr = sattr;
568
569 d_alias = nfs3_do_create(dir, dentry, data);
570 status = PTR_ERR_OR_ZERO(d_alias);
571
572 if (status == 0)
573 dput(d_alias);
574
575 nfs3_free_createdata(data);
576out:
577 dprintk("NFS reply symlink: %d\n", status);
578 return status;
579}
580
581static int
582nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
583{
584 struct posix_acl *default_acl, *acl;
585 struct nfs3_createdata *data;
586 struct dentry *d_alias;
587 int status = -ENOMEM;
588
589 dprintk("NFS call mkdir %pd\n", dentry);
590
591 data = nfs3_alloc_createdata();
592 if (data == NULL)
593 goto out;
594
595 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
596 if (status)
597 goto out;
598
599 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
600 data->arg.mkdir.fh = NFS_FH(dir);
601 data->arg.mkdir.name = dentry->d_name.name;
602 data->arg.mkdir.len = dentry->d_name.len;
603 data->arg.mkdir.sattr = sattr;
604
605 d_alias = nfs3_do_create(dir, dentry, data);
606 status = PTR_ERR_OR_ZERO(d_alias);
607
608 if (status != 0)
609 goto out_release_acls;
610
611 if (d_alias)
612 dentry = d_alias;
613
614 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
615
616 dput(d_alias);
617out_release_acls:
618 posix_acl_release(acl);
619 posix_acl_release(default_acl);
620out:
621 nfs3_free_createdata(data);
622 dprintk("NFS reply mkdir: %d\n", status);
623 return status;
624}
625
626static int
627nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
628{
629 struct nfs_fattr *dir_attr;
630 struct nfs3_diropargs arg = {
631 .fh = NFS_FH(dir),
632 .name = name->name,
633 .len = name->len
634 };
635 struct rpc_message msg = {
636 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
637 .rpc_argp = &arg,
638 };
639 int status = -ENOMEM;
640
641 dprintk("NFS call rmdir %s\n", name->name);
642 dir_attr = nfs_alloc_fattr();
643 if (dir_attr == NULL)
644 goto out;
645
646 msg.rpc_resp = dir_attr;
647 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
648 nfs_post_op_update_inode(dir, dir_attr);
649 nfs_free_fattr(dir_attr);
650out:
651 dprintk("NFS reply rmdir: %d\n", status);
652 return status;
653}
654
655/*
656 * The READDIR implementation is somewhat hackish - we pass the user buffer
657 * to the encode function, which installs it in the receive iovec.
658 * The decode function itself doesn't perform any decoding, it just makes
659 * sure the reply is syntactically correct.
660 *
661 * Also note that this implementation handles both plain readdir and
662 * readdirplus.
663 */
664static int nfs3_proc_readdir(struct nfs_readdir_arg *nr_arg,
665 struct nfs_readdir_res *nr_res)
666{
667 struct inode *dir = d_inode(nr_arg->dentry);
668 struct nfs3_readdirargs arg = {
669 .fh = NFS_FH(dir),
670 .cookie = nr_arg->cookie,
671 .plus = nr_arg->plus,
672 .count = nr_arg->page_len,
673 .pages = nr_arg->pages
674 };
675 struct nfs3_readdirres res = {
676 .verf = nr_res->verf,
677 .plus = nr_arg->plus,
678 };
679 struct rpc_message msg = {
680 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
681 .rpc_argp = &arg,
682 .rpc_resp = &res,
683 .rpc_cred = nr_arg->cred,
684 };
685 int status = -ENOMEM;
686
687 if (nr_arg->plus)
688 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
689 if (arg.cookie)
690 memcpy(arg.verf, nr_arg->verf, sizeof(arg.verf));
691
692 dprintk("NFS call readdir%s %llu\n", nr_arg->plus ? "plus" : "",
693 (unsigned long long)nr_arg->cookie);
694
695 res.dir_attr = nfs_alloc_fattr();
696 if (res.dir_attr == NULL)
697 goto out;
698
699 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
700
701 nfs_invalidate_atime(dir);
702 nfs_refresh_inode(dir, res.dir_attr);
703
704 nfs_free_fattr(res.dir_attr);
705out:
706 dprintk("NFS reply readdir%s: %d\n", nr_arg->plus ? "plus" : "",
707 status);
708 return status;
709}
710
711static int
712nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
713 dev_t rdev)
714{
715 struct posix_acl *default_acl, *acl;
716 struct nfs3_createdata *data;
717 struct dentry *d_alias;
718 int status = -ENOMEM;
719
720 dprintk("NFS call mknod %pd %u:%u\n", dentry,
721 MAJOR(rdev), MINOR(rdev));
722
723 data = nfs3_alloc_createdata();
724 if (data == NULL)
725 goto out;
726
727 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
728 if (status)
729 goto out;
730
731 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
732 data->arg.mknod.fh = NFS_FH(dir);
733 data->arg.mknod.name = dentry->d_name.name;
734 data->arg.mknod.len = dentry->d_name.len;
735 data->arg.mknod.sattr = sattr;
736 data->arg.mknod.rdev = rdev;
737
738 switch (sattr->ia_mode & S_IFMT) {
739 case S_IFBLK:
740 data->arg.mknod.type = NF3BLK;
741 break;
742 case S_IFCHR:
743 data->arg.mknod.type = NF3CHR;
744 break;
745 case S_IFIFO:
746 data->arg.mknod.type = NF3FIFO;
747 break;
748 case S_IFSOCK:
749 data->arg.mknod.type = NF3SOCK;
750 break;
751 default:
752 status = -EINVAL;
753 goto out_release_acls;
754 }
755
756 d_alias = nfs3_do_create(dir, dentry, data);
757 status = PTR_ERR_OR_ZERO(d_alias);
758 if (status != 0)
759 goto out_release_acls;
760
761 if (d_alias)
762 dentry = d_alias;
763
764 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
765
766 dput(d_alias);
767out_release_acls:
768 posix_acl_release(acl);
769 posix_acl_release(default_acl);
770out:
771 nfs3_free_createdata(data);
772 dprintk("NFS reply mknod: %d\n", status);
773 return status;
774}
775
776static int
777nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
778 struct nfs_fsstat *stat)
779{
780 struct rpc_message msg = {
781 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
782 .rpc_argp = fhandle,
783 .rpc_resp = stat,
784 };
785 int status;
786
787 dprintk("NFS call fsstat\n");
788 nfs_fattr_init(stat->fattr);
789 status = rpc_call_sync(server->client, &msg, 0);
790 dprintk("NFS reply fsstat: %d\n", status);
791 return status;
792}
793
794static int
795do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
796 struct nfs_fsinfo *info)
797{
798 struct rpc_message msg = {
799 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
800 .rpc_argp = fhandle,
801 .rpc_resp = info,
802 };
803 int status;
804
805 dprintk("NFS call fsinfo\n");
806 nfs_fattr_init(info->fattr);
807 status = rpc_call_sync(client, &msg, 0);
808 dprintk("NFS reply fsinfo: %d\n", status);
809 return status;
810}
811
812/*
813 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
814 * nfs_create_server
815 */
816static int
817nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
818 struct nfs_fsinfo *info)
819{
820 int status;
821
822 status = do_proc_fsinfo(server->client, fhandle, info);
823 if (status && server->nfs_client->cl_rpcclient != server->client)
824 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
825 return status;
826}
827
828static int
829nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
830 struct nfs_pathconf *info)
831{
832 struct rpc_message msg = {
833 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
834 .rpc_argp = fhandle,
835 .rpc_resp = info,
836 };
837 int status;
838
839 dprintk("NFS call pathconf\n");
840 nfs_fattr_init(info->fattr);
841 status = rpc_call_sync(server->client, &msg, 0);
842 dprintk("NFS reply pathconf: %d\n", status);
843 return status;
844}
845
846static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
847{
848 struct inode *inode = hdr->inode;
849 struct nfs_server *server = NFS_SERVER(inode);
850
851 if (hdr->pgio_done_cb != NULL)
852 return hdr->pgio_done_cb(task, hdr);
853
854 if (nfs3_async_handle_jukebox(task, inode))
855 return -EAGAIN;
856
857 if (task->tk_status >= 0 && !server->read_hdrsize)
858 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
859
860 nfs_invalidate_atime(inode);
861 nfs_refresh_inode(inode, &hdr->fattr);
862 return 0;
863}
864
865static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
866 struct rpc_message *msg)
867{
868 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
869 hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
870}
871
872static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
873 struct nfs_pgio_header *hdr)
874{
875 rpc_call_start(task);
876 return 0;
877}
878
879static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
880{
881 struct inode *inode = hdr->inode;
882
883 if (hdr->pgio_done_cb != NULL)
884 return hdr->pgio_done_cb(task, hdr);
885
886 if (nfs3_async_handle_jukebox(task, inode))
887 return -EAGAIN;
888 if (task->tk_status >= 0)
889 nfs_writeback_update_inode(hdr);
890 return 0;
891}
892
893static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
894 struct rpc_message *msg,
895 struct rpc_clnt **clnt)
896{
897 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
898}
899
900static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
901{
902 rpc_call_start(task);
903}
904
905static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
906{
907 if (data->commit_done_cb != NULL)
908 return data->commit_done_cb(task, data);
909
910 if (nfs3_async_handle_jukebox(task, data->inode))
911 return -EAGAIN;
912 nfs_refresh_inode(data->inode, data->res.fattr);
913 return 0;
914}
915
916static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
917 struct rpc_clnt **clnt)
918{
919 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
920}
921
922static void nfs3_nlm_alloc_call(void *data)
923{
924 struct nfs_lock_context *l_ctx = data;
925 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
926 get_nfs_open_context(l_ctx->open_context);
927 nfs_get_lock_context(l_ctx->open_context);
928 }
929}
930
931static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
932{
933 struct nfs_lock_context *l_ctx = data;
934 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
935 return nfs_async_iocounter_wait(task, l_ctx);
936 return false;
937
938}
939
940static void nfs3_nlm_release_call(void *data)
941{
942 struct nfs_lock_context *l_ctx = data;
943 struct nfs_open_context *ctx;
944 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
945 ctx = l_ctx->open_context;
946 nfs_put_lock_context(l_ctx);
947 put_nfs_open_context(ctx);
948 }
949}
950
951static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
952 .nlmclnt_alloc_call = nfs3_nlm_alloc_call,
953 .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
954 .nlmclnt_release_call = nfs3_nlm_release_call,
955};
956
957static int
958nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
959{
960 struct inode *inode = file_inode(filp);
961 struct nfs_lock_context *l_ctx = NULL;
962 struct nfs_open_context *ctx = nfs_file_open_context(filp);
963 int status;
964
965 if (fl->fl_flags & FL_CLOSE) {
966 l_ctx = nfs_get_lock_context(ctx);
967 if (IS_ERR(l_ctx))
968 l_ctx = NULL;
969 else
970 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
971 }
972
973 status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
974
975 if (l_ctx)
976 nfs_put_lock_context(l_ctx);
977
978 return status;
979}
980
981static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
982{
983 return 0;
984}
985
986static const struct inode_operations nfs3_dir_inode_operations = {
987 .create = nfs_create,
988 .lookup = nfs_lookup,
989 .link = nfs_link,
990 .unlink = nfs_unlink,
991 .symlink = nfs_symlink,
992 .mkdir = nfs_mkdir,
993 .rmdir = nfs_rmdir,
994 .mknod = nfs_mknod,
995 .rename = nfs_rename,
996 .permission = nfs_permission,
997 .getattr = nfs_getattr,
998 .setattr = nfs_setattr,
999#ifdef CONFIG_NFS_V3_ACL
1000 .listxattr = nfs3_listxattr,
1001 .get_inode_acl = nfs3_get_acl,
1002 .set_acl = nfs3_set_acl,
1003#endif
1004};
1005
1006static const struct inode_operations nfs3_file_inode_operations = {
1007 .permission = nfs_permission,
1008 .getattr = nfs_getattr,
1009 .setattr = nfs_setattr,
1010#ifdef CONFIG_NFS_V3_ACL
1011 .listxattr = nfs3_listxattr,
1012 .get_inode_acl = nfs3_get_acl,
1013 .set_acl = nfs3_set_acl,
1014#endif
1015};
1016
1017const struct nfs_rpc_ops nfs_v3_clientops = {
1018 .version = 3, /* protocol version */
1019 .dentry_ops = &nfs_dentry_operations,
1020 .dir_inode_ops = &nfs3_dir_inode_operations,
1021 .file_inode_ops = &nfs3_file_inode_operations,
1022 .file_ops = &nfs_file_operations,
1023 .nlmclnt_ops = &nlmclnt_fl_close_lock_ops,
1024 .getroot = nfs3_proc_get_root,
1025 .submount = nfs_submount,
1026 .try_get_tree = nfs_try_get_tree,
1027 .getattr = nfs3_proc_getattr,
1028 .setattr = nfs3_proc_setattr,
1029 .lookup = nfs3_proc_lookup,
1030 .lookupp = nfs3_proc_lookupp,
1031 .access = nfs3_proc_access,
1032 .readlink = nfs3_proc_readlink,
1033 .create = nfs3_proc_create,
1034 .remove = nfs3_proc_remove,
1035 .unlink_setup = nfs3_proc_unlink_setup,
1036 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1037 .unlink_done = nfs3_proc_unlink_done,
1038 .rename_setup = nfs3_proc_rename_setup,
1039 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1040 .rename_done = nfs3_proc_rename_done,
1041 .link = nfs3_proc_link,
1042 .symlink = nfs3_proc_symlink,
1043 .mkdir = nfs3_proc_mkdir,
1044 .rmdir = nfs3_proc_rmdir,
1045 .readdir = nfs3_proc_readdir,
1046 .mknod = nfs3_proc_mknod,
1047 .statfs = nfs3_proc_statfs,
1048 .fsinfo = nfs3_proc_fsinfo,
1049 .pathconf = nfs3_proc_pathconf,
1050 .decode_dirent = nfs3_decode_dirent,
1051 .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1052 .read_setup = nfs3_proc_read_setup,
1053 .read_done = nfs3_read_done,
1054 .write_setup = nfs3_proc_write_setup,
1055 .write_done = nfs3_write_done,
1056 .commit_setup = nfs3_proc_commit_setup,
1057 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1058 .commit_done = nfs3_commit_done,
1059 .lock = nfs3_proc_lock,
1060 .clear_acl_cache = forget_all_cached_acls,
1061 .close_context = nfs_close_context,
1062 .have_delegation = nfs3_have_delegation,
1063 .alloc_client = nfs_alloc_client,
1064 .init_client = nfs_init_client,
1065 .free_client = nfs_free_client,
1066 .create_server = nfs3_create_server,
1067 .clone_server = nfs3_clone_server,
1068};
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#include <linux/xattr.h>
22
23#include "iostat.h"
24#include "internal.h"
25
26#define NFSDBG_FACILITY NFSDBG_PROC
27
28/* A wrapper to handle the EJUKEBOX error messages */
29static int
30nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
31{
32 int res;
33 do {
34 res = rpc_call_sync(clnt, msg, flags);
35 if (res != -EJUKEBOX)
36 break;
37 freezable_schedule_timeout_killable_unsafe(NFS_JUKEBOX_RETRY_TIME);
38 res = -ERESTARTSYS;
39 } while (!fatal_signal_pending(current));
40 return res;
41}
42
43#define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
44
45static int
46nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
47{
48 if (task->tk_status != -EJUKEBOX)
49 return 0;
50 if (task->tk_status == -EJUKEBOX)
51 nfs_inc_stats(inode, NFSIOS_DELAY);
52 task->tk_status = 0;
53 rpc_restart_call(task);
54 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
55 return 1;
56}
57
58static int
59do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle,
60 struct nfs_fsinfo *info)
61{
62 struct rpc_message msg = {
63 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
64 .rpc_argp = fhandle,
65 .rpc_resp = info,
66 };
67 int status;
68
69 dprintk("%s: call fsinfo\n", __func__);
70 nfs_fattr_init(info->fattr);
71 status = rpc_call_sync(client, &msg, 0);
72 dprintk("%s: reply fsinfo: %d\n", __func__, status);
73 if (status == 0 && !(info->fattr->valid & NFS_ATTR_FATTR)) {
74 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
75 msg.rpc_resp = info->fattr;
76 status = rpc_call_sync(client, &msg, 0);
77 dprintk("%s: reply getattr: %d\n", __func__, status);
78 }
79 return status;
80}
81
82/*
83 * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb
84 */
85static int
86nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
87 struct nfs_fsinfo *info)
88{
89 int status;
90
91 status = do_proc_get_root(server->client, fhandle, info);
92 if (status && server->nfs_client->cl_rpcclient != server->client)
93 status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info);
94 return status;
95}
96
97/*
98 * One function for each procedure in the NFS protocol.
99 */
100static int
101nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
102 struct nfs_fattr *fattr, struct nfs4_label *label)
103{
104 struct rpc_message msg = {
105 .rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR],
106 .rpc_argp = fhandle,
107 .rpc_resp = fattr,
108 };
109 int status;
110
111 dprintk("NFS call getattr\n");
112 nfs_fattr_init(fattr);
113 status = rpc_call_sync(server->client, &msg, 0);
114 dprintk("NFS reply getattr: %d\n", status);
115 return status;
116}
117
118static int
119nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
120 struct iattr *sattr)
121{
122 struct inode *inode = dentry->d_inode;
123 struct nfs3_sattrargs arg = {
124 .fh = NFS_FH(inode),
125 .sattr = sattr,
126 };
127 struct rpc_message msg = {
128 .rpc_proc = &nfs3_procedures[NFS3PROC_SETATTR],
129 .rpc_argp = &arg,
130 .rpc_resp = fattr,
131 };
132 int status;
133
134 dprintk("NFS call setattr\n");
135 if (sattr->ia_valid & ATTR_FILE)
136 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
137 nfs_fattr_init(fattr);
138 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
139 if (status == 0)
140 nfs_setattr_update_inode(inode, sattr);
141 dprintk("NFS reply setattr: %d\n", status);
142 return status;
143}
144
145static int
146nfs3_proc_lookup(struct inode *dir, struct qstr *name,
147 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
148 struct nfs4_label *label)
149{
150 struct nfs3_diropargs arg = {
151 .fh = NFS_FH(dir),
152 .name = name->name,
153 .len = name->len
154 };
155 struct nfs3_diropres res = {
156 .fh = fhandle,
157 .fattr = fattr
158 };
159 struct rpc_message msg = {
160 .rpc_proc = &nfs3_procedures[NFS3PROC_LOOKUP],
161 .rpc_argp = &arg,
162 .rpc_resp = &res,
163 };
164 int status;
165
166 dprintk("NFS call lookup %s\n", name->name);
167 res.dir_attr = nfs_alloc_fattr();
168 if (res.dir_attr == NULL)
169 return -ENOMEM;
170
171 nfs_fattr_init(fattr);
172 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
173 nfs_refresh_inode(dir, res.dir_attr);
174 if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
175 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
176 msg.rpc_argp = fhandle;
177 msg.rpc_resp = fattr;
178 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
179 }
180 nfs_free_fattr(res.dir_attr);
181 dprintk("NFS reply lookup: %d\n", status);
182 return status;
183}
184
185static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
186{
187 struct nfs3_accessargs arg = {
188 .fh = NFS_FH(inode),
189 };
190 struct nfs3_accessres res;
191 struct rpc_message msg = {
192 .rpc_proc = &nfs3_procedures[NFS3PROC_ACCESS],
193 .rpc_argp = &arg,
194 .rpc_resp = &res,
195 .rpc_cred = entry->cred,
196 };
197 int mode = entry->mask;
198 int status = -ENOMEM;
199
200 dprintk("NFS call access\n");
201
202 if (mode & MAY_READ)
203 arg.access |= NFS3_ACCESS_READ;
204 if (S_ISDIR(inode->i_mode)) {
205 if (mode & MAY_WRITE)
206 arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE;
207 if (mode & MAY_EXEC)
208 arg.access |= NFS3_ACCESS_LOOKUP;
209 } else {
210 if (mode & MAY_WRITE)
211 arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND;
212 if (mode & MAY_EXEC)
213 arg.access |= NFS3_ACCESS_EXECUTE;
214 }
215
216 res.fattr = nfs_alloc_fattr();
217 if (res.fattr == NULL)
218 goto out;
219
220 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
221 nfs_refresh_inode(inode, res.fattr);
222 if (status == 0) {
223 entry->mask = 0;
224 if (res.access & NFS3_ACCESS_READ)
225 entry->mask |= MAY_READ;
226 if (res.access & (NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE))
227 entry->mask |= MAY_WRITE;
228 if (res.access & (NFS3_ACCESS_LOOKUP|NFS3_ACCESS_EXECUTE))
229 entry->mask |= MAY_EXEC;
230 }
231 nfs_free_fattr(res.fattr);
232out:
233 dprintk("NFS reply access: %d\n", status);
234 return status;
235}
236
237static int nfs3_proc_readlink(struct inode *inode, struct page *page,
238 unsigned int pgbase, unsigned int pglen)
239{
240 struct nfs_fattr *fattr;
241 struct nfs3_readlinkargs args = {
242 .fh = NFS_FH(inode),
243 .pgbase = pgbase,
244 .pglen = pglen,
245 .pages = &page
246 };
247 struct rpc_message msg = {
248 .rpc_proc = &nfs3_procedures[NFS3PROC_READLINK],
249 .rpc_argp = &args,
250 };
251 int status = -ENOMEM;
252
253 dprintk("NFS call readlink\n");
254 fattr = nfs_alloc_fattr();
255 if (fattr == NULL)
256 goto out;
257 msg.rpc_resp = fattr;
258
259 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
260 nfs_refresh_inode(inode, fattr);
261 nfs_free_fattr(fattr);
262out:
263 dprintk("NFS reply readlink: %d\n", status);
264 return status;
265}
266
267struct nfs3_createdata {
268 struct rpc_message msg;
269 union {
270 struct nfs3_createargs create;
271 struct nfs3_mkdirargs mkdir;
272 struct nfs3_symlinkargs symlink;
273 struct nfs3_mknodargs mknod;
274 } arg;
275 struct nfs3_diropres res;
276 struct nfs_fh fh;
277 struct nfs_fattr fattr;
278 struct nfs_fattr dir_attr;
279};
280
281static struct nfs3_createdata *nfs3_alloc_createdata(void)
282{
283 struct nfs3_createdata *data;
284
285 data = kzalloc(sizeof(*data), GFP_KERNEL);
286 if (data != NULL) {
287 data->msg.rpc_argp = &data->arg;
288 data->msg.rpc_resp = &data->res;
289 data->res.fh = &data->fh;
290 data->res.fattr = &data->fattr;
291 data->res.dir_attr = &data->dir_attr;
292 nfs_fattr_init(data->res.fattr);
293 nfs_fattr_init(data->res.dir_attr);
294 }
295 return data;
296}
297
298static int nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
299{
300 int status;
301
302 status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
303 nfs_post_op_update_inode(dir, data->res.dir_attr);
304 if (status == 0)
305 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
306 return status;
307}
308
309static void nfs3_free_createdata(struct nfs3_createdata *data)
310{
311 kfree(data);
312}
313
314/*
315 * Create a regular file.
316 */
317static int
318nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
319 int flags)
320{
321 struct posix_acl *default_acl, *acl;
322 struct nfs3_createdata *data;
323 int status = -ENOMEM;
324
325 dprintk("NFS call create %pd\n", dentry);
326
327 data = nfs3_alloc_createdata();
328 if (data == NULL)
329 goto out;
330
331 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
332 data->arg.create.fh = NFS_FH(dir);
333 data->arg.create.name = dentry->d_name.name;
334 data->arg.create.len = dentry->d_name.len;
335 data->arg.create.sattr = sattr;
336
337 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
338 if (flags & O_EXCL) {
339 data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE;
340 data->arg.create.verifier[0] = cpu_to_be32(jiffies);
341 data->arg.create.verifier[1] = cpu_to_be32(current->pid);
342 }
343
344 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
345 if (status)
346 goto out;
347
348 for (;;) {
349 status = nfs3_do_create(dir, dentry, data);
350
351 if (status != -ENOTSUPP)
352 break;
353 /* If the server doesn't support the exclusive creation
354 * semantics, try again with simple 'guarded' mode. */
355 switch (data->arg.create.createmode) {
356 case NFS3_CREATE_EXCLUSIVE:
357 data->arg.create.createmode = NFS3_CREATE_GUARDED;
358 break;
359
360 case NFS3_CREATE_GUARDED:
361 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
362 break;
363
364 case NFS3_CREATE_UNCHECKED:
365 goto out;
366 }
367 nfs_fattr_init(data->res.dir_attr);
368 nfs_fattr_init(data->res.fattr);
369 }
370
371 if (status != 0)
372 goto out_release_acls;
373
374 /* When we created the file with exclusive semantics, make
375 * sure we set the attributes afterwards. */
376 if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
377 dprintk("NFS call setattr (post-create)\n");
378
379 if (!(sattr->ia_valid & ATTR_ATIME_SET))
380 sattr->ia_valid |= ATTR_ATIME;
381 if (!(sattr->ia_valid & ATTR_MTIME_SET))
382 sattr->ia_valid |= ATTR_MTIME;
383
384 /* Note: we could use a guarded setattr here, but I'm
385 * not sure this buys us anything (and I'd have
386 * to revamp the NFSv3 XDR code) */
387 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
388 nfs_post_op_update_inode(dentry->d_inode, data->res.fattr);
389 dprintk("NFS reply setattr (post-create): %d\n", status);
390 if (status != 0)
391 goto out_release_acls;
392 }
393
394 status = nfs3_proc_setacls(dentry->d_inode, acl, default_acl);
395
396out_release_acls:
397 posix_acl_release(acl);
398 posix_acl_release(default_acl);
399out:
400 nfs3_free_createdata(data);
401 dprintk("NFS reply create: %d\n", status);
402 return status;
403}
404
405static int
406nfs3_proc_remove(struct inode *dir, struct qstr *name)
407{
408 struct nfs_removeargs arg = {
409 .fh = NFS_FH(dir),
410 .name = *name,
411 };
412 struct nfs_removeres res;
413 struct rpc_message msg = {
414 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
415 .rpc_argp = &arg,
416 .rpc_resp = &res,
417 };
418 int status = -ENOMEM;
419
420 dprintk("NFS call remove %s\n", name->name);
421 res.dir_attr = nfs_alloc_fattr();
422 if (res.dir_attr == NULL)
423 goto out;
424
425 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
426 nfs_post_op_update_inode(dir, res.dir_attr);
427 nfs_free_fattr(res.dir_attr);
428out:
429 dprintk("NFS reply remove: %d\n", status);
430 return status;
431}
432
433static void
434nfs3_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
435{
436 msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
437}
438
439static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
440{
441 rpc_call_start(task);
442}
443
444static int
445nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
446{
447 struct nfs_removeres *res;
448 if (nfs3_async_handle_jukebox(task, dir))
449 return 0;
450 res = task->tk_msg.rpc_resp;
451 nfs_post_op_update_inode(dir, res->dir_attr);
452 return 1;
453}
454
455static void
456nfs3_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
457{
458 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
459}
460
461static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
462{
463 rpc_call_start(task);
464}
465
466static int
467nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
468 struct inode *new_dir)
469{
470 struct nfs_renameres *res;
471
472 if (nfs3_async_handle_jukebox(task, old_dir))
473 return 0;
474 res = task->tk_msg.rpc_resp;
475
476 nfs_post_op_update_inode(old_dir, res->old_fattr);
477 nfs_post_op_update_inode(new_dir, res->new_fattr);
478 return 1;
479}
480
481static int
482nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
483{
484 struct nfs3_linkargs arg = {
485 .fromfh = NFS_FH(inode),
486 .tofh = NFS_FH(dir),
487 .toname = name->name,
488 .tolen = name->len
489 };
490 struct nfs3_linkres res;
491 struct rpc_message msg = {
492 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK],
493 .rpc_argp = &arg,
494 .rpc_resp = &res,
495 };
496 int status = -ENOMEM;
497
498 dprintk("NFS call link %s\n", name->name);
499 res.fattr = nfs_alloc_fattr();
500 res.dir_attr = nfs_alloc_fattr();
501 if (res.fattr == NULL || res.dir_attr == NULL)
502 goto out;
503
504 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
505 nfs_post_op_update_inode(dir, res.dir_attr);
506 nfs_post_op_update_inode(inode, res.fattr);
507out:
508 nfs_free_fattr(res.dir_attr);
509 nfs_free_fattr(res.fattr);
510 dprintk("NFS reply link: %d\n", status);
511 return status;
512}
513
514static int
515nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
516 unsigned int len, struct iattr *sattr)
517{
518 struct nfs3_createdata *data;
519 int status = -ENOMEM;
520
521 if (len > NFS3_MAXPATHLEN)
522 return -ENAMETOOLONG;
523
524 dprintk("NFS call symlink %pd\n", dentry);
525
526 data = nfs3_alloc_createdata();
527 if (data == NULL)
528 goto out;
529 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
530 data->arg.symlink.fromfh = NFS_FH(dir);
531 data->arg.symlink.fromname = dentry->d_name.name;
532 data->arg.symlink.fromlen = dentry->d_name.len;
533 data->arg.symlink.pages = &page;
534 data->arg.symlink.pathlen = len;
535 data->arg.symlink.sattr = sattr;
536
537 status = nfs3_do_create(dir, dentry, data);
538
539 nfs3_free_createdata(data);
540out:
541 dprintk("NFS reply symlink: %d\n", status);
542 return status;
543}
544
545static int
546nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
547{
548 struct posix_acl *default_acl, *acl;
549 struct nfs3_createdata *data;
550 int status = -ENOMEM;
551
552 dprintk("NFS call mkdir %pd\n", dentry);
553
554 data = nfs3_alloc_createdata();
555 if (data == NULL)
556 goto out;
557
558 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
559 if (status)
560 goto out;
561
562 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
563 data->arg.mkdir.fh = NFS_FH(dir);
564 data->arg.mkdir.name = dentry->d_name.name;
565 data->arg.mkdir.len = dentry->d_name.len;
566 data->arg.mkdir.sattr = sattr;
567
568 status = nfs3_do_create(dir, dentry, data);
569 if (status != 0)
570 goto out_release_acls;
571
572 status = nfs3_proc_setacls(dentry->d_inode, acl, default_acl);
573
574out_release_acls:
575 posix_acl_release(acl);
576 posix_acl_release(default_acl);
577out:
578 nfs3_free_createdata(data);
579 dprintk("NFS reply mkdir: %d\n", status);
580 return status;
581}
582
583static int
584nfs3_proc_rmdir(struct inode *dir, struct qstr *name)
585{
586 struct nfs_fattr *dir_attr;
587 struct nfs3_diropargs arg = {
588 .fh = NFS_FH(dir),
589 .name = name->name,
590 .len = name->len
591 };
592 struct rpc_message msg = {
593 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
594 .rpc_argp = &arg,
595 };
596 int status = -ENOMEM;
597
598 dprintk("NFS call rmdir %s\n", name->name);
599 dir_attr = nfs_alloc_fattr();
600 if (dir_attr == NULL)
601 goto out;
602
603 msg.rpc_resp = dir_attr;
604 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
605 nfs_post_op_update_inode(dir, dir_attr);
606 nfs_free_fattr(dir_attr);
607out:
608 dprintk("NFS reply rmdir: %d\n", status);
609 return status;
610}
611
612/*
613 * The READDIR implementation is somewhat hackish - we pass the user buffer
614 * to the encode function, which installs it in the receive iovec.
615 * The decode function itself doesn't perform any decoding, it just makes
616 * sure the reply is syntactically correct.
617 *
618 * Also note that this implementation handles both plain readdir and
619 * readdirplus.
620 */
621static int
622nfs3_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
623 u64 cookie, struct page **pages, unsigned int count, int plus)
624{
625 struct inode *dir = dentry->d_inode;
626 __be32 *verf = NFS_I(dir)->cookieverf;
627 struct nfs3_readdirargs arg = {
628 .fh = NFS_FH(dir),
629 .cookie = cookie,
630 .verf = {verf[0], verf[1]},
631 .plus = plus,
632 .count = count,
633 .pages = pages
634 };
635 struct nfs3_readdirres res = {
636 .verf = verf,
637 .plus = plus
638 };
639 struct rpc_message msg = {
640 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
641 .rpc_argp = &arg,
642 .rpc_resp = &res,
643 .rpc_cred = cred
644 };
645 int status = -ENOMEM;
646
647 if (plus)
648 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
649
650 dprintk("NFS call readdir%s %d\n",
651 plus? "plus" : "", (unsigned int) cookie);
652
653 res.dir_attr = nfs_alloc_fattr();
654 if (res.dir_attr == NULL)
655 goto out;
656
657 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
658
659 nfs_invalidate_atime(dir);
660 nfs_refresh_inode(dir, res.dir_attr);
661
662 nfs_free_fattr(res.dir_attr);
663out:
664 dprintk("NFS reply readdir%s: %d\n",
665 plus? "plus" : "", status);
666 return status;
667}
668
669static int
670nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
671 dev_t rdev)
672{
673 struct posix_acl *default_acl, *acl;
674 struct nfs3_createdata *data;
675 int status = -ENOMEM;
676
677 dprintk("NFS call mknod %pd %u:%u\n", dentry,
678 MAJOR(rdev), MINOR(rdev));
679
680 data = nfs3_alloc_createdata();
681 if (data == NULL)
682 goto out;
683
684 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
685 if (status)
686 goto out;
687
688 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
689 data->arg.mknod.fh = NFS_FH(dir);
690 data->arg.mknod.name = dentry->d_name.name;
691 data->arg.mknod.len = dentry->d_name.len;
692 data->arg.mknod.sattr = sattr;
693 data->arg.mknod.rdev = rdev;
694
695 switch (sattr->ia_mode & S_IFMT) {
696 case S_IFBLK:
697 data->arg.mknod.type = NF3BLK;
698 break;
699 case S_IFCHR:
700 data->arg.mknod.type = NF3CHR;
701 break;
702 case S_IFIFO:
703 data->arg.mknod.type = NF3FIFO;
704 break;
705 case S_IFSOCK:
706 data->arg.mknod.type = NF3SOCK;
707 break;
708 default:
709 status = -EINVAL;
710 goto out;
711 }
712
713 status = nfs3_do_create(dir, dentry, data);
714 if (status != 0)
715 goto out_release_acls;
716
717 status = nfs3_proc_setacls(dentry->d_inode, acl, default_acl);
718
719out_release_acls:
720 posix_acl_release(acl);
721 posix_acl_release(default_acl);
722out:
723 nfs3_free_createdata(data);
724 dprintk("NFS reply mknod: %d\n", status);
725 return status;
726}
727
728static int
729nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
730 struct nfs_fsstat *stat)
731{
732 struct rpc_message msg = {
733 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
734 .rpc_argp = fhandle,
735 .rpc_resp = stat,
736 };
737 int status;
738
739 dprintk("NFS call fsstat\n");
740 nfs_fattr_init(stat->fattr);
741 status = rpc_call_sync(server->client, &msg, 0);
742 dprintk("NFS reply fsstat: %d\n", status);
743 return status;
744}
745
746static int
747do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
748 struct nfs_fsinfo *info)
749{
750 struct rpc_message msg = {
751 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
752 .rpc_argp = fhandle,
753 .rpc_resp = info,
754 };
755 int status;
756
757 dprintk("NFS call fsinfo\n");
758 nfs_fattr_init(info->fattr);
759 status = rpc_call_sync(client, &msg, 0);
760 dprintk("NFS reply fsinfo: %d\n", status);
761 return status;
762}
763
764/*
765 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
766 * nfs_create_server
767 */
768static int
769nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
770 struct nfs_fsinfo *info)
771{
772 int status;
773
774 status = do_proc_fsinfo(server->client, fhandle, info);
775 if (status && server->nfs_client->cl_rpcclient != server->client)
776 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
777 return status;
778}
779
780static int
781nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
782 struct nfs_pathconf *info)
783{
784 struct rpc_message msg = {
785 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
786 .rpc_argp = fhandle,
787 .rpc_resp = info,
788 };
789 int status;
790
791 dprintk("NFS call pathconf\n");
792 nfs_fattr_init(info->fattr);
793 status = rpc_call_sync(server->client, &msg, 0);
794 dprintk("NFS reply pathconf: %d\n", status);
795 return status;
796}
797
798static int nfs3_read_done(struct rpc_task *task, struct nfs_read_data *data)
799{
800 struct inode *inode = data->header->inode;
801
802 if (nfs3_async_handle_jukebox(task, inode))
803 return -EAGAIN;
804
805 nfs_invalidate_atime(inode);
806 nfs_refresh_inode(inode, &data->fattr);
807 return 0;
808}
809
810static void nfs3_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
811{
812 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
813}
814
815static int nfs3_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
816{
817 rpc_call_start(task);
818 return 0;
819}
820
821static int nfs3_write_done(struct rpc_task *task, struct nfs_write_data *data)
822{
823 struct inode *inode = data->header->inode;
824
825 if (nfs3_async_handle_jukebox(task, inode))
826 return -EAGAIN;
827 if (task->tk_status >= 0)
828 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
829 return 0;
830}
831
832static void nfs3_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
833{
834 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
835}
836
837static int nfs3_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
838{
839 rpc_call_start(task);
840 return 0;
841}
842
843static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
844{
845 rpc_call_start(task);
846}
847
848static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
849{
850 if (nfs3_async_handle_jukebox(task, data->inode))
851 return -EAGAIN;
852 nfs_refresh_inode(data->inode, data->res.fattr);
853 return 0;
854}
855
856static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
857{
858 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
859}
860
861static int
862nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
863{
864 struct inode *inode = file_inode(filp);
865
866 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
867}
868
869static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
870{
871 return 0;
872}
873
874static int nfs3_return_delegation(struct inode *inode)
875{
876 nfs_wb_all(inode);
877 return 0;
878}
879
880static const struct inode_operations nfs3_dir_inode_operations = {
881 .create = nfs_create,
882 .lookup = nfs_lookup,
883 .link = nfs_link,
884 .unlink = nfs_unlink,
885 .symlink = nfs_symlink,
886 .mkdir = nfs_mkdir,
887 .rmdir = nfs_rmdir,
888 .mknod = nfs_mknod,
889 .rename = nfs_rename,
890 .permission = nfs_permission,
891 .getattr = nfs_getattr,
892 .setattr = nfs_setattr,
893#ifdef CONFIG_NFS_V3_ACL
894 .listxattr = generic_listxattr,
895 .getxattr = generic_getxattr,
896 .setxattr = generic_setxattr,
897 .removexattr = generic_removexattr,
898 .get_acl = nfs3_get_acl,
899 .set_acl = nfs3_set_acl,
900#endif
901};
902
903static const struct inode_operations nfs3_file_inode_operations = {
904 .permission = nfs_permission,
905 .getattr = nfs_getattr,
906 .setattr = nfs_setattr,
907#ifdef CONFIG_NFS_V3_ACL
908 .listxattr = generic_listxattr,
909 .getxattr = generic_getxattr,
910 .setxattr = generic_setxattr,
911 .removexattr = generic_removexattr,
912 .get_acl = nfs3_get_acl,
913 .set_acl = nfs3_set_acl,
914#endif
915};
916
917const struct nfs_rpc_ops nfs_v3_clientops = {
918 .version = 3, /* protocol version */
919 .dentry_ops = &nfs_dentry_operations,
920 .dir_inode_ops = &nfs3_dir_inode_operations,
921 .file_inode_ops = &nfs3_file_inode_operations,
922 .file_ops = &nfs_file_operations,
923 .getroot = nfs3_proc_get_root,
924 .submount = nfs_submount,
925 .try_mount = nfs_try_mount,
926 .getattr = nfs3_proc_getattr,
927 .setattr = nfs3_proc_setattr,
928 .lookup = nfs3_proc_lookup,
929 .access = nfs3_proc_access,
930 .readlink = nfs3_proc_readlink,
931 .create = nfs3_proc_create,
932 .remove = nfs3_proc_remove,
933 .unlink_setup = nfs3_proc_unlink_setup,
934 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
935 .unlink_done = nfs3_proc_unlink_done,
936 .rename_setup = nfs3_proc_rename_setup,
937 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
938 .rename_done = nfs3_proc_rename_done,
939 .link = nfs3_proc_link,
940 .symlink = nfs3_proc_symlink,
941 .mkdir = nfs3_proc_mkdir,
942 .rmdir = nfs3_proc_rmdir,
943 .readdir = nfs3_proc_readdir,
944 .mknod = nfs3_proc_mknod,
945 .statfs = nfs3_proc_statfs,
946 .fsinfo = nfs3_proc_fsinfo,
947 .pathconf = nfs3_proc_pathconf,
948 .decode_dirent = nfs3_decode_dirent,
949 .read_setup = nfs3_proc_read_setup,
950 .read_pageio_init = nfs_pageio_init_read,
951 .read_rpc_prepare = nfs3_proc_read_rpc_prepare,
952 .read_done = nfs3_read_done,
953 .write_setup = nfs3_proc_write_setup,
954 .write_pageio_init = nfs_pageio_init_write,
955 .write_rpc_prepare = nfs3_proc_write_rpc_prepare,
956 .write_done = nfs3_write_done,
957 .commit_setup = nfs3_proc_commit_setup,
958 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
959 .commit_done = nfs3_commit_done,
960 .lock = nfs3_proc_lock,
961 .clear_acl_cache = forget_all_cached_acls,
962 .close_context = nfs_close_context,
963 .have_delegation = nfs3_have_delegation,
964 .return_delegation = nfs3_return_delegation,
965 .alloc_client = nfs_alloc_client,
966 .init_client = nfs_init_client,
967 .free_client = nfs_free_client,
968 .create_server = nfs3_create_server,
969 .clone_server = nfs3_clone_server,
970};