Loading...
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
21#include "iostat.h"
22#include "internal.h"
23
24#define NFSDBG_FACILITY NFSDBG_PROC
25
26/* A wrapper to handle the EJUKEBOX and EKEYEXPIRED error messages */
27static int
28nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
29{
30 int res;
31 do {
32 res = rpc_call_sync(clnt, msg, flags);
33 if (res != -EJUKEBOX && res != -EKEYEXPIRED)
34 break;
35 schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
36 res = -ERESTARTSYS;
37 } while (!fatal_signal_pending(current));
38 return res;
39}
40
41#define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
42
43static int
44nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
45{
46 if (task->tk_status != -EJUKEBOX && task->tk_status != -EKEYEXPIRED)
47 return 0;
48 if (task->tk_status == -EJUKEBOX)
49 nfs_inc_stats(inode, NFSIOS_DELAY);
50 task->tk_status = 0;
51 rpc_restart_call(task);
52 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
53 return 1;
54}
55
56static int
57do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle,
58 struct nfs_fsinfo *info)
59{
60 struct rpc_message msg = {
61 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
62 .rpc_argp = fhandle,
63 .rpc_resp = info,
64 };
65 int status;
66
67 dprintk("%s: call fsinfo\n", __func__);
68 nfs_fattr_init(info->fattr);
69 status = rpc_call_sync(client, &msg, 0);
70 dprintk("%s: reply fsinfo: %d\n", __func__, status);
71 if (!(info->fattr->valid & NFS_ATTR_FATTR)) {
72 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
73 msg.rpc_resp = info->fattr;
74 status = rpc_call_sync(client, &msg, 0);
75 dprintk("%s: reply getattr: %d\n", __func__, status);
76 }
77 return status;
78}
79
80/*
81 * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb
82 */
83static int
84nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
85 struct nfs_fsinfo *info)
86{
87 int status;
88
89 status = do_proc_get_root(server->client, fhandle, info);
90 if (status && server->nfs_client->cl_rpcclient != server->client)
91 status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info);
92 return status;
93}
94
95/*
96 * One function for each procedure in the NFS protocol.
97 */
98static int
99nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
100 struct nfs_fattr *fattr)
101{
102 struct rpc_message msg = {
103 .rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR],
104 .rpc_argp = fhandle,
105 .rpc_resp = fattr,
106 };
107 int status;
108
109 dprintk("NFS call getattr\n");
110 nfs_fattr_init(fattr);
111 status = rpc_call_sync(server->client, &msg, 0);
112 dprintk("NFS reply getattr: %d\n", status);
113 return status;
114}
115
116static int
117nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
118 struct iattr *sattr)
119{
120 struct inode *inode = dentry->d_inode;
121 struct nfs3_sattrargs arg = {
122 .fh = NFS_FH(inode),
123 .sattr = sattr,
124 };
125 struct rpc_message msg = {
126 .rpc_proc = &nfs3_procedures[NFS3PROC_SETATTR],
127 .rpc_argp = &arg,
128 .rpc_resp = fattr,
129 };
130 int status;
131
132 dprintk("NFS call setattr\n");
133 if (sattr->ia_valid & ATTR_FILE)
134 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
135 nfs_fattr_init(fattr);
136 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
137 if (status == 0)
138 nfs_setattr_update_inode(inode, sattr);
139 dprintk("NFS reply setattr: %d\n", status);
140 return status;
141}
142
143static int
144nfs3_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
145 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
146{
147 struct nfs3_diropargs arg = {
148 .fh = NFS_FH(dir),
149 .name = name->name,
150 .len = name->len
151 };
152 struct nfs3_diropres res = {
153 .fh = fhandle,
154 .fattr = fattr
155 };
156 struct rpc_message msg = {
157 .rpc_proc = &nfs3_procedures[NFS3PROC_LOOKUP],
158 .rpc_argp = &arg,
159 .rpc_resp = &res,
160 };
161 int status;
162
163 dprintk("NFS call lookup %s\n", name->name);
164 res.dir_attr = nfs_alloc_fattr();
165 if (res.dir_attr == NULL)
166 return -ENOMEM;
167
168 nfs_fattr_init(fattr);
169 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
170 nfs_refresh_inode(dir, res.dir_attr);
171 if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
172 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
173 msg.rpc_argp = fhandle;
174 msg.rpc_resp = fattr;
175 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
176 }
177 nfs_free_fattr(res.dir_attr);
178 dprintk("NFS reply lookup: %d\n", status);
179 return status;
180}
181
182static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
183{
184 struct nfs3_accessargs arg = {
185 .fh = NFS_FH(inode),
186 };
187 struct nfs3_accessres res;
188 struct rpc_message msg = {
189 .rpc_proc = &nfs3_procedures[NFS3PROC_ACCESS],
190 .rpc_argp = &arg,
191 .rpc_resp = &res,
192 .rpc_cred = entry->cred,
193 };
194 int mode = entry->mask;
195 int status = -ENOMEM;
196
197 dprintk("NFS call access\n");
198
199 if (mode & MAY_READ)
200 arg.access |= NFS3_ACCESS_READ;
201 if (S_ISDIR(inode->i_mode)) {
202 if (mode & MAY_WRITE)
203 arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE;
204 if (mode & MAY_EXEC)
205 arg.access |= NFS3_ACCESS_LOOKUP;
206 } else {
207 if (mode & MAY_WRITE)
208 arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND;
209 if (mode & MAY_EXEC)
210 arg.access |= NFS3_ACCESS_EXECUTE;
211 }
212
213 res.fattr = nfs_alloc_fattr();
214 if (res.fattr == NULL)
215 goto out;
216
217 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
218 nfs_refresh_inode(inode, res.fattr);
219 if (status == 0) {
220 entry->mask = 0;
221 if (res.access & NFS3_ACCESS_READ)
222 entry->mask |= MAY_READ;
223 if (res.access & (NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE))
224 entry->mask |= MAY_WRITE;
225 if (res.access & (NFS3_ACCESS_LOOKUP|NFS3_ACCESS_EXECUTE))
226 entry->mask |= MAY_EXEC;
227 }
228 nfs_free_fattr(res.fattr);
229out:
230 dprintk("NFS reply access: %d\n", status);
231 return status;
232}
233
234static int nfs3_proc_readlink(struct inode *inode, struct page *page,
235 unsigned int pgbase, unsigned int pglen)
236{
237 struct nfs_fattr *fattr;
238 struct nfs3_readlinkargs args = {
239 .fh = NFS_FH(inode),
240 .pgbase = pgbase,
241 .pglen = pglen,
242 .pages = &page
243 };
244 struct rpc_message msg = {
245 .rpc_proc = &nfs3_procedures[NFS3PROC_READLINK],
246 .rpc_argp = &args,
247 };
248 int status = -ENOMEM;
249
250 dprintk("NFS call readlink\n");
251 fattr = nfs_alloc_fattr();
252 if (fattr == NULL)
253 goto out;
254 msg.rpc_resp = fattr;
255
256 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
257 nfs_refresh_inode(inode, fattr);
258 nfs_free_fattr(fattr);
259out:
260 dprintk("NFS reply readlink: %d\n", status);
261 return status;
262}
263
264struct nfs3_createdata {
265 struct rpc_message msg;
266 union {
267 struct nfs3_createargs create;
268 struct nfs3_mkdirargs mkdir;
269 struct nfs3_symlinkargs symlink;
270 struct nfs3_mknodargs mknod;
271 } arg;
272 struct nfs3_diropres res;
273 struct nfs_fh fh;
274 struct nfs_fattr fattr;
275 struct nfs_fattr dir_attr;
276};
277
278static struct nfs3_createdata *nfs3_alloc_createdata(void)
279{
280 struct nfs3_createdata *data;
281
282 data = kzalloc(sizeof(*data), GFP_KERNEL);
283 if (data != NULL) {
284 data->msg.rpc_argp = &data->arg;
285 data->msg.rpc_resp = &data->res;
286 data->res.fh = &data->fh;
287 data->res.fattr = &data->fattr;
288 data->res.dir_attr = &data->dir_attr;
289 nfs_fattr_init(data->res.fattr);
290 nfs_fattr_init(data->res.dir_attr);
291 }
292 return data;
293}
294
295static int nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
296{
297 int status;
298
299 status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
300 nfs_post_op_update_inode(dir, data->res.dir_attr);
301 if (status == 0)
302 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
303 return status;
304}
305
306static void nfs3_free_createdata(struct nfs3_createdata *data)
307{
308 kfree(data);
309}
310
311/*
312 * Create a regular file.
313 */
314static int
315nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
316 int flags, struct nfs_open_context *ctx)
317{
318 struct nfs3_createdata *data;
319 umode_t mode = sattr->ia_mode;
320 int status = -ENOMEM;
321
322 dprintk("NFS call create %s\n", dentry->d_name.name);
323
324 data = nfs3_alloc_createdata();
325 if (data == NULL)
326 goto out;
327
328 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
329 data->arg.create.fh = NFS_FH(dir);
330 data->arg.create.name = dentry->d_name.name;
331 data->arg.create.len = dentry->d_name.len;
332 data->arg.create.sattr = sattr;
333
334 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
335 if (flags & O_EXCL) {
336 data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE;
337 data->arg.create.verifier[0] = jiffies;
338 data->arg.create.verifier[1] = current->pid;
339 }
340
341 sattr->ia_mode &= ~current_umask();
342
343 for (;;) {
344 status = nfs3_do_create(dir, dentry, data);
345
346 if (status != -ENOTSUPP)
347 break;
348 /* If the server doesn't support the exclusive creation
349 * semantics, try again with simple 'guarded' mode. */
350 switch (data->arg.create.createmode) {
351 case NFS3_CREATE_EXCLUSIVE:
352 data->arg.create.createmode = NFS3_CREATE_GUARDED;
353 break;
354
355 case NFS3_CREATE_GUARDED:
356 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
357 break;
358
359 case NFS3_CREATE_UNCHECKED:
360 goto out;
361 }
362 nfs_fattr_init(data->res.dir_attr);
363 nfs_fattr_init(data->res.fattr);
364 }
365
366 if (status != 0)
367 goto out;
368
369 /* When we created the file with exclusive semantics, make
370 * sure we set the attributes afterwards. */
371 if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
372 dprintk("NFS call setattr (post-create)\n");
373
374 if (!(sattr->ia_valid & ATTR_ATIME_SET))
375 sattr->ia_valid |= ATTR_ATIME;
376 if (!(sattr->ia_valid & ATTR_MTIME_SET))
377 sattr->ia_valid |= ATTR_MTIME;
378
379 /* Note: we could use a guarded setattr here, but I'm
380 * not sure this buys us anything (and I'd have
381 * to revamp the NFSv3 XDR code) */
382 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
383 nfs_post_op_update_inode(dentry->d_inode, data->res.fattr);
384 dprintk("NFS reply setattr (post-create): %d\n", status);
385 if (status != 0)
386 goto out;
387 }
388 status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
389out:
390 nfs3_free_createdata(data);
391 dprintk("NFS reply create: %d\n", status);
392 return status;
393}
394
395static int
396nfs3_proc_remove(struct inode *dir, struct qstr *name)
397{
398 struct nfs_removeargs arg = {
399 .fh = NFS_FH(dir),
400 .name.len = name->len,
401 .name.name = 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 int
431nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
432{
433 struct nfs_removeres *res;
434 if (nfs3_async_handle_jukebox(task, dir))
435 return 0;
436 res = task->tk_msg.rpc_resp;
437 nfs_post_op_update_inode(dir, res->dir_attr);
438 return 1;
439}
440
441static void
442nfs3_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
443{
444 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
445}
446
447static int
448nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
449 struct inode *new_dir)
450{
451 struct nfs_renameres *res;
452
453 if (nfs3_async_handle_jukebox(task, old_dir))
454 return 0;
455 res = task->tk_msg.rpc_resp;
456
457 nfs_post_op_update_inode(old_dir, res->old_fattr);
458 nfs_post_op_update_inode(new_dir, res->new_fattr);
459 return 1;
460}
461
462static int
463nfs3_proc_rename(struct inode *old_dir, struct qstr *old_name,
464 struct inode *new_dir, struct qstr *new_name)
465{
466 struct nfs_renameargs arg = {
467 .old_dir = NFS_FH(old_dir),
468 .old_name = old_name,
469 .new_dir = NFS_FH(new_dir),
470 .new_name = new_name,
471 };
472 struct nfs_renameres res;
473 struct rpc_message msg = {
474 .rpc_proc = &nfs3_procedures[NFS3PROC_RENAME],
475 .rpc_argp = &arg,
476 .rpc_resp = &res,
477 };
478 int status = -ENOMEM;
479
480 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
481
482 res.old_fattr = nfs_alloc_fattr();
483 res.new_fattr = nfs_alloc_fattr();
484 if (res.old_fattr == NULL || res.new_fattr == NULL)
485 goto out;
486
487 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
488 nfs_post_op_update_inode(old_dir, res.old_fattr);
489 nfs_post_op_update_inode(new_dir, res.new_fattr);
490out:
491 nfs_free_fattr(res.old_fattr);
492 nfs_free_fattr(res.new_fattr);
493 dprintk("NFS reply rename: %d\n", status);
494 return status;
495}
496
497static int
498nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
499{
500 struct nfs3_linkargs arg = {
501 .fromfh = NFS_FH(inode),
502 .tofh = NFS_FH(dir),
503 .toname = name->name,
504 .tolen = name->len
505 };
506 struct nfs3_linkres res;
507 struct rpc_message msg = {
508 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK],
509 .rpc_argp = &arg,
510 .rpc_resp = &res,
511 };
512 int status = -ENOMEM;
513
514 dprintk("NFS call link %s\n", name->name);
515 res.fattr = nfs_alloc_fattr();
516 res.dir_attr = nfs_alloc_fattr();
517 if (res.fattr == NULL || res.dir_attr == NULL)
518 goto out;
519
520 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
521 nfs_post_op_update_inode(dir, res.dir_attr);
522 nfs_post_op_update_inode(inode, res.fattr);
523out:
524 nfs_free_fattr(res.dir_attr);
525 nfs_free_fattr(res.fattr);
526 dprintk("NFS reply link: %d\n", status);
527 return status;
528}
529
530static int
531nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
532 unsigned int len, struct iattr *sattr)
533{
534 struct nfs3_createdata *data;
535 int status = -ENOMEM;
536
537 if (len > NFS3_MAXPATHLEN)
538 return -ENAMETOOLONG;
539
540 dprintk("NFS call symlink %s\n", dentry->d_name.name);
541
542 data = nfs3_alloc_createdata();
543 if (data == NULL)
544 goto out;
545 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
546 data->arg.symlink.fromfh = NFS_FH(dir);
547 data->arg.symlink.fromname = dentry->d_name.name;
548 data->arg.symlink.fromlen = dentry->d_name.len;
549 data->arg.symlink.pages = &page;
550 data->arg.symlink.pathlen = len;
551 data->arg.symlink.sattr = sattr;
552
553 status = nfs3_do_create(dir, dentry, data);
554
555 nfs3_free_createdata(data);
556out:
557 dprintk("NFS reply symlink: %d\n", status);
558 return status;
559}
560
561static int
562nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
563{
564 struct nfs3_createdata *data;
565 umode_t mode = sattr->ia_mode;
566 int status = -ENOMEM;
567
568 dprintk("NFS call mkdir %s\n", dentry->d_name.name);
569
570 sattr->ia_mode &= ~current_umask();
571
572 data = nfs3_alloc_createdata();
573 if (data == NULL)
574 goto out;
575
576 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
577 data->arg.mkdir.fh = NFS_FH(dir);
578 data->arg.mkdir.name = dentry->d_name.name;
579 data->arg.mkdir.len = dentry->d_name.len;
580 data->arg.mkdir.sattr = sattr;
581
582 status = nfs3_do_create(dir, dentry, data);
583 if (status != 0)
584 goto out;
585
586 status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
587out:
588 nfs3_free_createdata(data);
589 dprintk("NFS reply mkdir: %d\n", status);
590 return status;
591}
592
593static int
594nfs3_proc_rmdir(struct inode *dir, struct qstr *name)
595{
596 struct nfs_fattr *dir_attr;
597 struct nfs3_diropargs arg = {
598 .fh = NFS_FH(dir),
599 .name = name->name,
600 .len = name->len
601 };
602 struct rpc_message msg = {
603 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
604 .rpc_argp = &arg,
605 };
606 int status = -ENOMEM;
607
608 dprintk("NFS call rmdir %s\n", name->name);
609 dir_attr = nfs_alloc_fattr();
610 if (dir_attr == NULL)
611 goto out;
612
613 msg.rpc_resp = dir_attr;
614 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
615 nfs_post_op_update_inode(dir, dir_attr);
616 nfs_free_fattr(dir_attr);
617out:
618 dprintk("NFS reply rmdir: %d\n", status);
619 return status;
620}
621
622/*
623 * The READDIR implementation is somewhat hackish - we pass the user buffer
624 * to the encode function, which installs it in the receive iovec.
625 * The decode function itself doesn't perform any decoding, it just makes
626 * sure the reply is syntactically correct.
627 *
628 * Also note that this implementation handles both plain readdir and
629 * readdirplus.
630 */
631static int
632nfs3_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
633 u64 cookie, struct page **pages, unsigned int count, int plus)
634{
635 struct inode *dir = dentry->d_inode;
636 __be32 *verf = NFS_COOKIEVERF(dir);
637 struct nfs3_readdirargs arg = {
638 .fh = NFS_FH(dir),
639 .cookie = cookie,
640 .verf = {verf[0], verf[1]},
641 .plus = plus,
642 .count = count,
643 .pages = pages
644 };
645 struct nfs3_readdirres res = {
646 .verf = verf,
647 .plus = plus
648 };
649 struct rpc_message msg = {
650 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
651 .rpc_argp = &arg,
652 .rpc_resp = &res,
653 .rpc_cred = cred
654 };
655 int status = -ENOMEM;
656
657 if (plus)
658 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
659
660 dprintk("NFS call readdir%s %d\n",
661 plus? "plus" : "", (unsigned int) cookie);
662
663 res.dir_attr = nfs_alloc_fattr();
664 if (res.dir_attr == NULL)
665 goto out;
666
667 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
668
669 nfs_invalidate_atime(dir);
670 nfs_refresh_inode(dir, res.dir_attr);
671
672 nfs_free_fattr(res.dir_attr);
673out:
674 dprintk("NFS reply readdir%s: %d\n",
675 plus? "plus" : "", status);
676 return status;
677}
678
679static int
680nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
681 dev_t rdev)
682{
683 struct nfs3_createdata *data;
684 umode_t mode = sattr->ia_mode;
685 int status = -ENOMEM;
686
687 dprintk("NFS call mknod %s %u:%u\n", dentry->d_name.name,
688 MAJOR(rdev), MINOR(rdev));
689
690 sattr->ia_mode &= ~current_umask();
691
692 data = nfs3_alloc_createdata();
693 if (data == NULL)
694 goto out;
695
696 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
697 data->arg.mknod.fh = NFS_FH(dir);
698 data->arg.mknod.name = dentry->d_name.name;
699 data->arg.mknod.len = dentry->d_name.len;
700 data->arg.mknod.sattr = sattr;
701 data->arg.mknod.rdev = rdev;
702
703 switch (sattr->ia_mode & S_IFMT) {
704 case S_IFBLK:
705 data->arg.mknod.type = NF3BLK;
706 break;
707 case S_IFCHR:
708 data->arg.mknod.type = NF3CHR;
709 break;
710 case S_IFIFO:
711 data->arg.mknod.type = NF3FIFO;
712 break;
713 case S_IFSOCK:
714 data->arg.mknod.type = NF3SOCK;
715 break;
716 default:
717 status = -EINVAL;
718 goto out;
719 }
720
721 status = nfs3_do_create(dir, dentry, data);
722 if (status != 0)
723 goto out;
724 status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
725out:
726 nfs3_free_createdata(data);
727 dprintk("NFS reply mknod: %d\n", status);
728 return status;
729}
730
731static int
732nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
733 struct nfs_fsstat *stat)
734{
735 struct rpc_message msg = {
736 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
737 .rpc_argp = fhandle,
738 .rpc_resp = stat,
739 };
740 int status;
741
742 dprintk("NFS call fsstat\n");
743 nfs_fattr_init(stat->fattr);
744 status = rpc_call_sync(server->client, &msg, 0);
745 dprintk("NFS reply fsstat: %d\n", status);
746 return status;
747}
748
749static int
750do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
751 struct nfs_fsinfo *info)
752{
753 struct rpc_message msg = {
754 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
755 .rpc_argp = fhandle,
756 .rpc_resp = info,
757 };
758 int status;
759
760 dprintk("NFS call fsinfo\n");
761 nfs_fattr_init(info->fattr);
762 status = rpc_call_sync(client, &msg, 0);
763 dprintk("NFS reply fsinfo: %d\n", status);
764 return status;
765}
766
767/*
768 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
769 * nfs_create_server
770 */
771static int
772nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
773 struct nfs_fsinfo *info)
774{
775 int status;
776
777 status = do_proc_fsinfo(server->client, fhandle, info);
778 if (status && server->nfs_client->cl_rpcclient != server->client)
779 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
780 return status;
781}
782
783static int
784nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
785 struct nfs_pathconf *info)
786{
787 struct rpc_message msg = {
788 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
789 .rpc_argp = fhandle,
790 .rpc_resp = info,
791 };
792 int status;
793
794 dprintk("NFS call pathconf\n");
795 nfs_fattr_init(info->fattr);
796 status = rpc_call_sync(server->client, &msg, 0);
797 dprintk("NFS reply pathconf: %d\n", status);
798 return status;
799}
800
801static int nfs3_read_done(struct rpc_task *task, struct nfs_read_data *data)
802{
803 if (nfs3_async_handle_jukebox(task, data->inode))
804 return -EAGAIN;
805
806 nfs_invalidate_atime(data->inode);
807 nfs_refresh_inode(data->inode, &data->fattr);
808 return 0;
809}
810
811static void nfs3_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
812{
813 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
814}
815
816static int nfs3_write_done(struct rpc_task *task, struct nfs_write_data *data)
817{
818 if (nfs3_async_handle_jukebox(task, data->inode))
819 return -EAGAIN;
820 if (task->tk_status >= 0)
821 nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
822 return 0;
823}
824
825static void nfs3_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
826{
827 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
828}
829
830static int nfs3_commit_done(struct rpc_task *task, struct nfs_write_data *data)
831{
832 if (nfs3_async_handle_jukebox(task, data->inode))
833 return -EAGAIN;
834 nfs_refresh_inode(data->inode, data->res.fattr);
835 return 0;
836}
837
838static void nfs3_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
839{
840 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
841}
842
843static int
844nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
845{
846 struct inode *inode = filp->f_path.dentry->d_inode;
847
848 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
849}
850
851const struct nfs_rpc_ops nfs_v3_clientops = {
852 .version = 3, /* protocol version */
853 .dentry_ops = &nfs_dentry_operations,
854 .dir_inode_ops = &nfs3_dir_inode_operations,
855 .file_inode_ops = &nfs3_file_inode_operations,
856 .getroot = nfs3_proc_get_root,
857 .getattr = nfs3_proc_getattr,
858 .setattr = nfs3_proc_setattr,
859 .lookup = nfs3_proc_lookup,
860 .access = nfs3_proc_access,
861 .readlink = nfs3_proc_readlink,
862 .create = nfs3_proc_create,
863 .remove = nfs3_proc_remove,
864 .unlink_setup = nfs3_proc_unlink_setup,
865 .unlink_done = nfs3_proc_unlink_done,
866 .rename = nfs3_proc_rename,
867 .rename_setup = nfs3_proc_rename_setup,
868 .rename_done = nfs3_proc_rename_done,
869 .link = nfs3_proc_link,
870 .symlink = nfs3_proc_symlink,
871 .mkdir = nfs3_proc_mkdir,
872 .rmdir = nfs3_proc_rmdir,
873 .readdir = nfs3_proc_readdir,
874 .mknod = nfs3_proc_mknod,
875 .statfs = nfs3_proc_statfs,
876 .fsinfo = nfs3_proc_fsinfo,
877 .pathconf = nfs3_proc_pathconf,
878 .decode_dirent = nfs3_decode_dirent,
879 .read_setup = nfs3_proc_read_setup,
880 .read_done = nfs3_read_done,
881 .write_setup = nfs3_proc_write_setup,
882 .write_done = nfs3_write_done,
883 .commit_setup = nfs3_proc_commit_setup,
884 .commit_done = nfs3_commit_done,
885 .lock = nfs3_proc_lock,
886 .clear_acl_cache = nfs3_forget_cached_acls,
887 .close_context = nfs_close_context,
888 .init_client = nfs_init_client,
889};
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 freezable_schedule_timeout_killable_unsafe(NFS_JUKEBOX_RETRY_TIME);
40 res = -ERESTARTSYS;
41 } while (!fatal_signal_pending(current));
42 return res;
43}
44
45#define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
46
47static int
48nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
49{
50 if (task->tk_status != -EJUKEBOX)
51 return 0;
52 if (task->tk_status == -EJUKEBOX)
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 nfs4_label *label,
105 struct inode *inode)
106{
107 struct rpc_message msg = {
108 .rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR],
109 .rpc_argp = fhandle,
110 .rpc_resp = fattr,
111 };
112 int status;
113 unsigned short task_flags = 0;
114
115 /* Is this is an attribute revalidation, subject to softreval? */
116 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
117 task_flags |= RPC_TASK_TIMEOUT;
118
119 dprintk("NFS call getattr\n");
120 nfs_fattr_init(fattr);
121 status = rpc_call_sync(server->client, &msg, task_flags);
122 dprintk("NFS reply getattr: %d\n", status);
123 return status;
124}
125
126static int
127nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
128 struct iattr *sattr)
129{
130 struct inode *inode = d_inode(dentry);
131 struct nfs3_sattrargs arg = {
132 .fh = NFS_FH(inode),
133 .sattr = sattr,
134 };
135 struct rpc_message msg = {
136 .rpc_proc = &nfs3_procedures[NFS3PROC_SETATTR],
137 .rpc_argp = &arg,
138 .rpc_resp = fattr,
139 };
140 int status;
141
142 dprintk("NFS call setattr\n");
143 if (sattr->ia_valid & ATTR_FILE)
144 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
145 nfs_fattr_init(fattr);
146 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
147 if (status == 0) {
148 nfs_setattr_update_inode(inode, sattr, fattr);
149 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
150 nfs_zap_acl_cache(inode);
151 }
152 dprintk("NFS reply setattr: %d\n", status);
153 return status;
154}
155
156static int
157nfs3_proc_lookup(struct inode *dir, struct dentry *dentry,
158 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
159 struct nfs4_label *label)
160{
161 struct nfs3_diropargs arg = {
162 .fh = NFS_FH(dir),
163 .name = dentry->d_name.name,
164 .len = dentry->d_name.len
165 };
166 struct nfs3_diropres res = {
167 .fh = fhandle,
168 .fattr = fattr
169 };
170 struct rpc_message msg = {
171 .rpc_proc = &nfs3_procedures[NFS3PROC_LOOKUP],
172 .rpc_argp = &arg,
173 .rpc_resp = &res,
174 };
175 int status;
176 unsigned short task_flags = 0;
177
178 /* Is this is an attribute revalidation, subject to softreval? */
179 if (nfs_lookup_is_soft_revalidate(dentry))
180 task_flags |= RPC_TASK_TIMEOUT;
181
182 res.dir_attr = nfs_alloc_fattr();
183 if (res.dir_attr == NULL)
184 return -ENOMEM;
185
186 dprintk("NFS call lookup %pd2\n", dentry);
187 nfs_fattr_init(fattr);
188 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
189 nfs_refresh_inode(dir, res.dir_attr);
190 if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
191 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
192 msg.rpc_argp = fhandle;
193 msg.rpc_resp = fattr;
194 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
195 }
196 nfs_free_fattr(res.dir_attr);
197 dprintk("NFS reply lookup: %d\n", status);
198 return status;
199}
200
201static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
202{
203 struct nfs3_accessargs arg = {
204 .fh = NFS_FH(inode),
205 .access = entry->mask,
206 };
207 struct nfs3_accessres res;
208 struct rpc_message msg = {
209 .rpc_proc = &nfs3_procedures[NFS3PROC_ACCESS],
210 .rpc_argp = &arg,
211 .rpc_resp = &res,
212 .rpc_cred = entry->cred,
213 };
214 int status = -ENOMEM;
215
216 dprintk("NFS call access\n");
217 res.fattr = nfs_alloc_fattr();
218 if (res.fattr == NULL)
219 goto out;
220
221 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
222 nfs_refresh_inode(inode, res.fattr);
223 if (status == 0)
224 nfs_access_set_mask(entry, res.access);
225 nfs_free_fattr(res.fattr);
226out:
227 dprintk("NFS reply access: %d\n", status);
228 return status;
229}
230
231static int nfs3_proc_readlink(struct inode *inode, struct page *page,
232 unsigned int pgbase, unsigned int pglen)
233{
234 struct nfs_fattr *fattr;
235 struct nfs3_readlinkargs args = {
236 .fh = NFS_FH(inode),
237 .pgbase = pgbase,
238 .pglen = pglen,
239 .pages = &page
240 };
241 struct rpc_message msg = {
242 .rpc_proc = &nfs3_procedures[NFS3PROC_READLINK],
243 .rpc_argp = &args,
244 };
245 int status = -ENOMEM;
246
247 dprintk("NFS call readlink\n");
248 fattr = nfs_alloc_fattr();
249 if (fattr == NULL)
250 goto out;
251 msg.rpc_resp = fattr;
252
253 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
254 nfs_refresh_inode(inode, fattr);
255 nfs_free_fattr(fattr);
256out:
257 dprintk("NFS reply readlink: %d\n", status);
258 return status;
259}
260
261struct nfs3_createdata {
262 struct rpc_message msg;
263 union {
264 struct nfs3_createargs create;
265 struct nfs3_mkdirargs mkdir;
266 struct nfs3_symlinkargs symlink;
267 struct nfs3_mknodargs mknod;
268 } arg;
269 struct nfs3_diropres res;
270 struct nfs_fh fh;
271 struct nfs_fattr fattr;
272 struct nfs_fattr dir_attr;
273};
274
275static struct nfs3_createdata *nfs3_alloc_createdata(void)
276{
277 struct nfs3_createdata *data;
278
279 data = kzalloc(sizeof(*data), GFP_KERNEL);
280 if (data != NULL) {
281 data->msg.rpc_argp = &data->arg;
282 data->msg.rpc_resp = &data->res;
283 data->res.fh = &data->fh;
284 data->res.fattr = &data->fattr;
285 data->res.dir_attr = &data->dir_attr;
286 nfs_fattr_init(data->res.fattr);
287 nfs_fattr_init(data->res.dir_attr);
288 }
289 return data;
290}
291
292static struct dentry *
293nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
294{
295 int status;
296
297 status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
298 nfs_post_op_update_inode(dir, data->res.dir_attr);
299 if (status != 0)
300 return ERR_PTR(status);
301
302 return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr, NULL);
303}
304
305static void nfs3_free_createdata(struct nfs3_createdata *data)
306{
307 kfree(data);
308}
309
310/*
311 * Create a regular file.
312 */
313static int
314nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
315 int flags)
316{
317 struct posix_acl *default_acl, *acl;
318 struct nfs3_createdata *data;
319 struct dentry *d_alias;
320 int status = -ENOMEM;
321
322 dprintk("NFS call create %pd\n", dentry);
323
324 data = nfs3_alloc_createdata();
325 if (data == NULL)
326 goto out;
327
328 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
329 data->arg.create.fh = NFS_FH(dir);
330 data->arg.create.name = dentry->d_name.name;
331 data->arg.create.len = dentry->d_name.len;
332 data->arg.create.sattr = sattr;
333
334 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
335 if (flags & O_EXCL) {
336 data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE;
337 data->arg.create.verifier[0] = cpu_to_be32(jiffies);
338 data->arg.create.verifier[1] = cpu_to_be32(current->pid);
339 }
340
341 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
342 if (status)
343 goto out;
344
345 for (;;) {
346 d_alias = nfs3_do_create(dir, dentry, data);
347 status = PTR_ERR_OR_ZERO(d_alias);
348
349 if (status != -ENOTSUPP)
350 break;
351 /* If the server doesn't support the exclusive creation
352 * semantics, try again with simple 'guarded' mode. */
353 switch (data->arg.create.createmode) {
354 case NFS3_CREATE_EXCLUSIVE:
355 data->arg.create.createmode = NFS3_CREATE_GUARDED;
356 break;
357
358 case NFS3_CREATE_GUARDED:
359 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
360 break;
361
362 case NFS3_CREATE_UNCHECKED:
363 goto out;
364 }
365 nfs_fattr_init(data->res.dir_attr);
366 nfs_fattr_init(data->res.fattr);
367 }
368
369 if (status != 0)
370 goto out_release_acls;
371
372 if (d_alias)
373 dentry = d_alias;
374
375 /* When we created the file with exclusive semantics, make
376 * sure we set the attributes afterwards. */
377 if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
378 dprintk("NFS call setattr (post-create)\n");
379
380 if (!(sattr->ia_valid & ATTR_ATIME_SET))
381 sattr->ia_valid |= ATTR_ATIME;
382 if (!(sattr->ia_valid & ATTR_MTIME_SET))
383 sattr->ia_valid |= ATTR_MTIME;
384
385 /* Note: we could use a guarded setattr here, but I'm
386 * not sure this buys us anything (and I'd have
387 * to revamp the NFSv3 XDR code) */
388 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
389 nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
390 dprintk("NFS reply setattr (post-create): %d\n", status);
391 if (status != 0)
392 goto out_dput;
393 }
394
395 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
396
397out_dput:
398 dput(d_alias);
399out_release_acls:
400 posix_acl_release(acl);
401 posix_acl_release(default_acl);
402out:
403 nfs3_free_createdata(data);
404 dprintk("NFS reply create: %d\n", status);
405 return status;
406}
407
408static int
409nfs3_proc_remove(struct inode *dir, struct dentry *dentry)
410{
411 struct nfs_removeargs arg = {
412 .fh = NFS_FH(dir),
413 .name = dentry->d_name,
414 };
415 struct nfs_removeres res;
416 struct rpc_message msg = {
417 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
418 .rpc_argp = &arg,
419 .rpc_resp = &res,
420 };
421 int status = -ENOMEM;
422
423 dprintk("NFS call remove %pd2\n", dentry);
424 res.dir_attr = nfs_alloc_fattr();
425 if (res.dir_attr == NULL)
426 goto out;
427
428 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
429 nfs_post_op_update_inode(dir, res.dir_attr);
430 nfs_free_fattr(res.dir_attr);
431out:
432 dprintk("NFS reply remove: %d\n", status);
433 return status;
434}
435
436static void
437nfs3_proc_unlink_setup(struct rpc_message *msg,
438 struct dentry *dentry,
439 struct inode *inode)
440{
441 msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
442}
443
444static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
445{
446 rpc_call_start(task);
447}
448
449static int
450nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
451{
452 struct nfs_removeres *res;
453 if (nfs3_async_handle_jukebox(task, dir))
454 return 0;
455 res = task->tk_msg.rpc_resp;
456 nfs_post_op_update_inode(dir, res->dir_attr);
457 return 1;
458}
459
460static void
461nfs3_proc_rename_setup(struct rpc_message *msg,
462 struct dentry *old_dentry,
463 struct dentry *new_dentry)
464{
465 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
466}
467
468static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
469{
470 rpc_call_start(task);
471}
472
473static int
474nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
475 struct inode *new_dir)
476{
477 struct nfs_renameres *res;
478
479 if (nfs3_async_handle_jukebox(task, old_dir))
480 return 0;
481 res = task->tk_msg.rpc_resp;
482
483 nfs_post_op_update_inode(old_dir, res->old_fattr);
484 nfs_post_op_update_inode(new_dir, res->new_fattr);
485 return 1;
486}
487
488static int
489nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
490{
491 struct nfs3_linkargs arg = {
492 .fromfh = NFS_FH(inode),
493 .tofh = NFS_FH(dir),
494 .toname = name->name,
495 .tolen = name->len
496 };
497 struct nfs3_linkres res;
498 struct rpc_message msg = {
499 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK],
500 .rpc_argp = &arg,
501 .rpc_resp = &res,
502 };
503 int status = -ENOMEM;
504
505 dprintk("NFS call link %s\n", name->name);
506 res.fattr = nfs_alloc_fattr();
507 res.dir_attr = nfs_alloc_fattr();
508 if (res.fattr == NULL || res.dir_attr == NULL)
509 goto out;
510
511 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
512 nfs_post_op_update_inode(dir, res.dir_attr);
513 nfs_post_op_update_inode(inode, res.fattr);
514out:
515 nfs_free_fattr(res.dir_attr);
516 nfs_free_fattr(res.fattr);
517 dprintk("NFS reply link: %d\n", status);
518 return status;
519}
520
521static int
522nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
523 unsigned int len, struct iattr *sattr)
524{
525 struct nfs3_createdata *data;
526 struct dentry *d_alias;
527 int status = -ENOMEM;
528
529 if (len > NFS3_MAXPATHLEN)
530 return -ENAMETOOLONG;
531
532 dprintk("NFS call symlink %pd\n", dentry);
533
534 data = nfs3_alloc_createdata();
535 if (data == NULL)
536 goto out;
537 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
538 data->arg.symlink.fromfh = NFS_FH(dir);
539 data->arg.symlink.fromname = dentry->d_name.name;
540 data->arg.symlink.fromlen = dentry->d_name.len;
541 data->arg.symlink.pages = &page;
542 data->arg.symlink.pathlen = len;
543 data->arg.symlink.sattr = sattr;
544
545 d_alias = nfs3_do_create(dir, dentry, data);
546 status = PTR_ERR_OR_ZERO(d_alias);
547
548 if (status == 0)
549 dput(d_alias);
550
551 nfs3_free_createdata(data);
552out:
553 dprintk("NFS reply symlink: %d\n", status);
554 return status;
555}
556
557static int
558nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
559{
560 struct posix_acl *default_acl, *acl;
561 struct nfs3_createdata *data;
562 struct dentry *d_alias;
563 int status = -ENOMEM;
564
565 dprintk("NFS call mkdir %pd\n", dentry);
566
567 data = nfs3_alloc_createdata();
568 if (data == NULL)
569 goto out;
570
571 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
572 if (status)
573 goto out;
574
575 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
576 data->arg.mkdir.fh = NFS_FH(dir);
577 data->arg.mkdir.name = dentry->d_name.name;
578 data->arg.mkdir.len = dentry->d_name.len;
579 data->arg.mkdir.sattr = sattr;
580
581 d_alias = nfs3_do_create(dir, dentry, data);
582 status = PTR_ERR_OR_ZERO(d_alias);
583
584 if (status != 0)
585 goto out_release_acls;
586
587 if (d_alias)
588 dentry = d_alias;
589
590 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
591
592 dput(d_alias);
593out_release_acls:
594 posix_acl_release(acl);
595 posix_acl_release(default_acl);
596out:
597 nfs3_free_createdata(data);
598 dprintk("NFS reply mkdir: %d\n", status);
599 return status;
600}
601
602static int
603nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
604{
605 struct nfs_fattr *dir_attr;
606 struct nfs3_diropargs arg = {
607 .fh = NFS_FH(dir),
608 .name = name->name,
609 .len = name->len
610 };
611 struct rpc_message msg = {
612 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
613 .rpc_argp = &arg,
614 };
615 int status = -ENOMEM;
616
617 dprintk("NFS call rmdir %s\n", name->name);
618 dir_attr = nfs_alloc_fattr();
619 if (dir_attr == NULL)
620 goto out;
621
622 msg.rpc_resp = dir_attr;
623 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
624 nfs_post_op_update_inode(dir, dir_attr);
625 nfs_free_fattr(dir_attr);
626out:
627 dprintk("NFS reply rmdir: %d\n", status);
628 return status;
629}
630
631/*
632 * The READDIR implementation is somewhat hackish - we pass the user buffer
633 * to the encode function, which installs it in the receive iovec.
634 * The decode function itself doesn't perform any decoding, it just makes
635 * sure the reply is syntactically correct.
636 *
637 * Also note that this implementation handles both plain readdir and
638 * readdirplus.
639 */
640static int
641nfs3_proc_readdir(struct dentry *dentry, const struct cred *cred,
642 u64 cookie, struct page **pages, unsigned int count, bool plus)
643{
644 struct inode *dir = d_inode(dentry);
645 __be32 *verf = NFS_I(dir)->cookieverf;
646 struct nfs3_readdirargs arg = {
647 .fh = NFS_FH(dir),
648 .cookie = cookie,
649 .verf = {verf[0], verf[1]},
650 .plus = plus,
651 .count = count,
652 .pages = pages
653 };
654 struct nfs3_readdirres res = {
655 .verf = verf,
656 .plus = plus
657 };
658 struct rpc_message msg = {
659 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
660 .rpc_argp = &arg,
661 .rpc_resp = &res,
662 .rpc_cred = cred,
663 };
664 int status = -ENOMEM;
665
666 if (plus)
667 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
668
669 dprintk("NFS call readdir%s %d\n",
670 plus? "plus" : "", (unsigned int) cookie);
671
672 res.dir_attr = nfs_alloc_fattr();
673 if (res.dir_attr == NULL)
674 goto out;
675
676 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
677
678 nfs_invalidate_atime(dir);
679 nfs_refresh_inode(dir, res.dir_attr);
680
681 nfs_free_fattr(res.dir_attr);
682out:
683 dprintk("NFS reply readdir%s: %d\n",
684 plus? "plus" : "", status);
685 return status;
686}
687
688static int
689nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
690 dev_t rdev)
691{
692 struct posix_acl *default_acl, *acl;
693 struct nfs3_createdata *data;
694 struct dentry *d_alias;
695 int status = -ENOMEM;
696
697 dprintk("NFS call mknod %pd %u:%u\n", dentry,
698 MAJOR(rdev), MINOR(rdev));
699
700 data = nfs3_alloc_createdata();
701 if (data == NULL)
702 goto out;
703
704 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
705 if (status)
706 goto out;
707
708 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
709 data->arg.mknod.fh = NFS_FH(dir);
710 data->arg.mknod.name = dentry->d_name.name;
711 data->arg.mknod.len = dentry->d_name.len;
712 data->arg.mknod.sattr = sattr;
713 data->arg.mknod.rdev = rdev;
714
715 switch (sattr->ia_mode & S_IFMT) {
716 case S_IFBLK:
717 data->arg.mknod.type = NF3BLK;
718 break;
719 case S_IFCHR:
720 data->arg.mknod.type = NF3CHR;
721 break;
722 case S_IFIFO:
723 data->arg.mknod.type = NF3FIFO;
724 break;
725 case S_IFSOCK:
726 data->arg.mknod.type = NF3SOCK;
727 break;
728 default:
729 status = -EINVAL;
730 goto out;
731 }
732
733 d_alias = nfs3_do_create(dir, dentry, data);
734 status = PTR_ERR_OR_ZERO(d_alias);
735 if (status != 0)
736 goto out_release_acls;
737
738 if (d_alias)
739 dentry = d_alias;
740
741 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
742
743 dput(d_alias);
744out_release_acls:
745 posix_acl_release(acl);
746 posix_acl_release(default_acl);
747out:
748 nfs3_free_createdata(data);
749 dprintk("NFS reply mknod: %d\n", status);
750 return status;
751}
752
753static int
754nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
755 struct nfs_fsstat *stat)
756{
757 struct rpc_message msg = {
758 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
759 .rpc_argp = fhandle,
760 .rpc_resp = stat,
761 };
762 int status;
763
764 dprintk("NFS call fsstat\n");
765 nfs_fattr_init(stat->fattr);
766 status = rpc_call_sync(server->client, &msg, 0);
767 dprintk("NFS reply fsstat: %d\n", status);
768 return status;
769}
770
771static int
772do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
773 struct nfs_fsinfo *info)
774{
775 struct rpc_message msg = {
776 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
777 .rpc_argp = fhandle,
778 .rpc_resp = info,
779 };
780 int status;
781
782 dprintk("NFS call fsinfo\n");
783 nfs_fattr_init(info->fattr);
784 status = rpc_call_sync(client, &msg, 0);
785 dprintk("NFS reply fsinfo: %d\n", status);
786 return status;
787}
788
789/*
790 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
791 * nfs_create_server
792 */
793static int
794nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
795 struct nfs_fsinfo *info)
796{
797 int status;
798
799 status = do_proc_fsinfo(server->client, fhandle, info);
800 if (status && server->nfs_client->cl_rpcclient != server->client)
801 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
802 return status;
803}
804
805static int
806nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
807 struct nfs_pathconf *info)
808{
809 struct rpc_message msg = {
810 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
811 .rpc_argp = fhandle,
812 .rpc_resp = info,
813 };
814 int status;
815
816 dprintk("NFS call pathconf\n");
817 nfs_fattr_init(info->fattr);
818 status = rpc_call_sync(server->client, &msg, 0);
819 dprintk("NFS reply pathconf: %d\n", status);
820 return status;
821}
822
823static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
824{
825 struct inode *inode = hdr->inode;
826 struct nfs_server *server = NFS_SERVER(inode);
827
828 if (hdr->pgio_done_cb != NULL)
829 return hdr->pgio_done_cb(task, hdr);
830
831 if (nfs3_async_handle_jukebox(task, inode))
832 return -EAGAIN;
833
834 if (task->tk_status >= 0 && !server->read_hdrsize)
835 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
836
837 nfs_invalidate_atime(inode);
838 nfs_refresh_inode(inode, &hdr->fattr);
839 return 0;
840}
841
842static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
843 struct rpc_message *msg)
844{
845 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
846 hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
847}
848
849static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
850 struct nfs_pgio_header *hdr)
851{
852 rpc_call_start(task);
853 return 0;
854}
855
856static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
857{
858 struct inode *inode = hdr->inode;
859
860 if (hdr->pgio_done_cb != NULL)
861 return hdr->pgio_done_cb(task, hdr);
862
863 if (nfs3_async_handle_jukebox(task, inode))
864 return -EAGAIN;
865 if (task->tk_status >= 0)
866 nfs_writeback_update_inode(hdr);
867 return 0;
868}
869
870static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
871 struct rpc_message *msg,
872 struct rpc_clnt **clnt)
873{
874 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
875}
876
877static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
878{
879 rpc_call_start(task);
880}
881
882static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
883{
884 if (data->commit_done_cb != NULL)
885 return data->commit_done_cb(task, data);
886
887 if (nfs3_async_handle_jukebox(task, data->inode))
888 return -EAGAIN;
889 nfs_refresh_inode(data->inode, data->res.fattr);
890 return 0;
891}
892
893static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
894 struct rpc_clnt **clnt)
895{
896 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
897}
898
899static void nfs3_nlm_alloc_call(void *data)
900{
901 struct nfs_lock_context *l_ctx = data;
902 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
903 get_nfs_open_context(l_ctx->open_context);
904 nfs_get_lock_context(l_ctx->open_context);
905 }
906}
907
908static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
909{
910 struct nfs_lock_context *l_ctx = data;
911 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
912 return nfs_async_iocounter_wait(task, l_ctx);
913 return false;
914
915}
916
917static void nfs3_nlm_release_call(void *data)
918{
919 struct nfs_lock_context *l_ctx = data;
920 struct nfs_open_context *ctx;
921 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
922 ctx = l_ctx->open_context;
923 nfs_put_lock_context(l_ctx);
924 put_nfs_open_context(ctx);
925 }
926}
927
928static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
929 .nlmclnt_alloc_call = nfs3_nlm_alloc_call,
930 .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
931 .nlmclnt_release_call = nfs3_nlm_release_call,
932};
933
934static int
935nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
936{
937 struct inode *inode = file_inode(filp);
938 struct nfs_lock_context *l_ctx = NULL;
939 struct nfs_open_context *ctx = nfs_file_open_context(filp);
940 int status;
941
942 if (fl->fl_flags & FL_CLOSE) {
943 l_ctx = nfs_get_lock_context(ctx);
944 if (IS_ERR(l_ctx))
945 l_ctx = NULL;
946 else
947 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
948 }
949
950 status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
951
952 if (l_ctx)
953 nfs_put_lock_context(l_ctx);
954
955 return status;
956}
957
958static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
959{
960 return 0;
961}
962
963static const struct inode_operations nfs3_dir_inode_operations = {
964 .create = nfs_create,
965 .lookup = nfs_lookup,
966 .link = nfs_link,
967 .unlink = nfs_unlink,
968 .symlink = nfs_symlink,
969 .mkdir = nfs_mkdir,
970 .rmdir = nfs_rmdir,
971 .mknod = nfs_mknod,
972 .rename = nfs_rename,
973 .permission = nfs_permission,
974 .getattr = nfs_getattr,
975 .setattr = nfs_setattr,
976#ifdef CONFIG_NFS_V3_ACL
977 .listxattr = nfs3_listxattr,
978 .get_acl = nfs3_get_acl,
979 .set_acl = nfs3_set_acl,
980#endif
981};
982
983static const struct inode_operations nfs3_file_inode_operations = {
984 .permission = nfs_permission,
985 .getattr = nfs_getattr,
986 .setattr = nfs_setattr,
987#ifdef CONFIG_NFS_V3_ACL
988 .listxattr = nfs3_listxattr,
989 .get_acl = nfs3_get_acl,
990 .set_acl = nfs3_set_acl,
991#endif
992};
993
994const struct nfs_rpc_ops nfs_v3_clientops = {
995 .version = 3, /* protocol version */
996 .dentry_ops = &nfs_dentry_operations,
997 .dir_inode_ops = &nfs3_dir_inode_operations,
998 .file_inode_ops = &nfs3_file_inode_operations,
999 .file_ops = &nfs_file_operations,
1000 .nlmclnt_ops = &nlmclnt_fl_close_lock_ops,
1001 .getroot = nfs3_proc_get_root,
1002 .submount = nfs_submount,
1003 .try_get_tree = nfs_try_get_tree,
1004 .getattr = nfs3_proc_getattr,
1005 .setattr = nfs3_proc_setattr,
1006 .lookup = nfs3_proc_lookup,
1007 .access = nfs3_proc_access,
1008 .readlink = nfs3_proc_readlink,
1009 .create = nfs3_proc_create,
1010 .remove = nfs3_proc_remove,
1011 .unlink_setup = nfs3_proc_unlink_setup,
1012 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1013 .unlink_done = nfs3_proc_unlink_done,
1014 .rename_setup = nfs3_proc_rename_setup,
1015 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1016 .rename_done = nfs3_proc_rename_done,
1017 .link = nfs3_proc_link,
1018 .symlink = nfs3_proc_symlink,
1019 .mkdir = nfs3_proc_mkdir,
1020 .rmdir = nfs3_proc_rmdir,
1021 .readdir = nfs3_proc_readdir,
1022 .mknod = nfs3_proc_mknod,
1023 .statfs = nfs3_proc_statfs,
1024 .fsinfo = nfs3_proc_fsinfo,
1025 .pathconf = nfs3_proc_pathconf,
1026 .decode_dirent = nfs3_decode_dirent,
1027 .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1028 .read_setup = nfs3_proc_read_setup,
1029 .read_done = nfs3_read_done,
1030 .write_setup = nfs3_proc_write_setup,
1031 .write_done = nfs3_write_done,
1032 .commit_setup = nfs3_proc_commit_setup,
1033 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1034 .commit_done = nfs3_commit_done,
1035 .lock = nfs3_proc_lock,
1036 .clear_acl_cache = forget_all_cached_acls,
1037 .close_context = nfs_close_context,
1038 .have_delegation = nfs3_have_delegation,
1039 .alloc_client = nfs_alloc_client,
1040 .init_client = nfs_init_client,
1041 .free_client = nfs_free_client,
1042 .create_server = nfs3_create_server,
1043 .clone_server = nfs3_clone_server,
1044};