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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/proc.c
4 *
5 * Copyright (C) 1992, 1993, 1994 Rick Sladkey
6 *
7 * OS-independent nfs remote procedure call functions
8 *
9 * Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
10 * so at last we can have decent(ish) throughput off a
11 * Sun server.
12 *
13 * Coding optimized and cleaned up by Florian La Roche.
14 * Note: Error returns are optimized for NFS_OK, which isn't translated via
15 * nfs_stat_to_errno(), but happens to be already the right return code.
16 *
17 * Also, the code currently doesn't check the size of the packet, when
18 * it decodes the packet.
19 *
20 * Feel free to fix it and mail me the diffs if it worries you.
21 *
22 * Completely rewritten to support the new RPC call interface;
23 * rewrote and moved the entire XDR stuff to xdr.c
24 * --Olaf Kirch June 1996
25 *
26 * The code below initializes all auto variables explicitly, otherwise
27 * it will fail to work as a module (gcc generates a memset call for an
28 * incomplete struct).
29 */
30
31#include <linux/types.h>
32#include <linux/param.h>
33#include <linux/time.h>
34#include <linux/mm.h>
35#include <linux/errno.h>
36#include <linux/string.h>
37#include <linux/in.h>
38#include <linux/pagemap.h>
39#include <linux/sunrpc/clnt.h>
40#include <linux/nfs.h>
41#include <linux/nfs2.h>
42#include <linux/nfs_fs.h>
43#include <linux/nfs_page.h>
44#include <linux/lockd/bind.h>
45#include <linux/freezer.h>
46#include "internal.h"
47
48#define NFSDBG_FACILITY NFSDBG_PROC
49
50/*
51 * Bare-bones access to getattr: this is for nfs_read_super.
52 */
53static int
54nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
55 struct nfs_fsinfo *info)
56{
57 struct nfs_fattr *fattr = info->fattr;
58 struct nfs2_fsstat fsinfo;
59 struct rpc_message msg = {
60 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
61 .rpc_argp = fhandle,
62 .rpc_resp = fattr,
63 };
64 int status;
65
66 dprintk("%s: call getattr\n", __func__);
67 nfs_fattr_init(fattr);
68 status = rpc_call_sync(server->client, &msg, 0);
69 /* Retry with default authentication if different */
70 if (status && server->nfs_client->cl_rpcclient != server->client)
71 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
72 dprintk("%s: reply getattr: %d\n", __func__, status);
73 if (status)
74 return status;
75 dprintk("%s: call statfs\n", __func__);
76 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
77 msg.rpc_resp = &fsinfo;
78 status = rpc_call_sync(server->client, &msg, 0);
79 /* Retry with default authentication if different */
80 if (status && server->nfs_client->cl_rpcclient != server->client)
81 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
82 dprintk("%s: reply statfs: %d\n", __func__, status);
83 if (status)
84 return status;
85 info->rtmax = NFS_MAXDATA;
86 info->rtpref = fsinfo.tsize;
87 info->rtmult = fsinfo.bsize;
88 info->wtmax = NFS_MAXDATA;
89 info->wtpref = fsinfo.tsize;
90 info->wtmult = fsinfo.bsize;
91 info->dtpref = fsinfo.tsize;
92 info->maxfilesize = 0x7FFFFFFF;
93 info->lease_time = 0;
94 return 0;
95}
96
97/*
98 * One function for each procedure in the NFS protocol.
99 */
100static int
101nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
102 struct nfs_fattr *fattr, struct nfs4_label *label,
103 struct inode *inode)
104{
105 struct rpc_message msg = {
106 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
107 .rpc_argp = fhandle,
108 .rpc_resp = fattr,
109 };
110 int status;
111
112 dprintk("NFS call getattr\n");
113 nfs_fattr_init(fattr);
114 status = rpc_call_sync(server->client, &msg, 0);
115 dprintk("NFS reply getattr: %d\n", status);
116 return status;
117}
118
119static int
120nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
121 struct iattr *sattr)
122{
123 struct inode *inode = d_inode(dentry);
124 struct nfs_sattrargs arg = {
125 .fh = NFS_FH(inode),
126 .sattr = sattr
127 };
128 struct rpc_message msg = {
129 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
130 .rpc_argp = &arg,
131 .rpc_resp = fattr,
132 };
133 int status;
134
135 /* Mask out the non-modebit related stuff from attr->ia_mode */
136 sattr->ia_mode &= S_IALLUGO;
137
138 dprintk("NFS call setattr\n");
139 if (sattr->ia_valid & ATTR_FILE)
140 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
141 nfs_fattr_init(fattr);
142 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
143 if (status == 0)
144 nfs_setattr_update_inode(inode, sattr, fattr);
145 dprintk("NFS reply setattr: %d\n", status);
146 return status;
147}
148
149static int
150nfs_proc_lookup(struct inode *dir, const struct qstr *name,
151 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
152 struct nfs4_label *label)
153{
154 struct nfs_diropargs arg = {
155 .fh = NFS_FH(dir),
156 .name = name->name,
157 .len = name->len
158 };
159 struct nfs_diropok res = {
160 .fh = fhandle,
161 .fattr = fattr
162 };
163 struct rpc_message msg = {
164 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
165 .rpc_argp = &arg,
166 .rpc_resp = &res,
167 };
168 int status;
169
170 dprintk("NFS call lookup %s\n", name->name);
171 nfs_fattr_init(fattr);
172 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
173 dprintk("NFS reply lookup: %d\n", status);
174 return status;
175}
176
177static int nfs_proc_readlink(struct inode *inode, struct page *page,
178 unsigned int pgbase, unsigned int pglen)
179{
180 struct nfs_readlinkargs args = {
181 .fh = NFS_FH(inode),
182 .pgbase = pgbase,
183 .pglen = pglen,
184 .pages = &page
185 };
186 struct rpc_message msg = {
187 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
188 .rpc_argp = &args,
189 };
190 int status;
191
192 dprintk("NFS call readlink\n");
193 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
194 dprintk("NFS reply readlink: %d\n", status);
195 return status;
196}
197
198struct nfs_createdata {
199 struct nfs_createargs arg;
200 struct nfs_diropok res;
201 struct nfs_fh fhandle;
202 struct nfs_fattr fattr;
203};
204
205static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
206 struct dentry *dentry, struct iattr *sattr)
207{
208 struct nfs_createdata *data;
209
210 data = kmalloc(sizeof(*data), GFP_KERNEL);
211
212 if (data != NULL) {
213 data->arg.fh = NFS_FH(dir);
214 data->arg.name = dentry->d_name.name;
215 data->arg.len = dentry->d_name.len;
216 data->arg.sattr = sattr;
217 nfs_fattr_init(&data->fattr);
218 data->fhandle.size = 0;
219 data->res.fh = &data->fhandle;
220 data->res.fattr = &data->fattr;
221 }
222 return data;
223};
224
225static void nfs_free_createdata(const struct nfs_createdata *data)
226{
227 kfree(data);
228}
229
230static int
231nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
232 int flags)
233{
234 struct nfs_createdata *data;
235 struct rpc_message msg = {
236 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
237 };
238 int status = -ENOMEM;
239
240 dprintk("NFS call create %pd\n", dentry);
241 data = nfs_alloc_createdata(dir, dentry, sattr);
242 if (data == NULL)
243 goto out;
244 msg.rpc_argp = &data->arg;
245 msg.rpc_resp = &data->res;
246 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
247 nfs_mark_for_revalidate(dir);
248 if (status == 0)
249 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
250 nfs_free_createdata(data);
251out:
252 dprintk("NFS reply create: %d\n", status);
253 return status;
254}
255
256/*
257 * In NFSv2, mknod is grafted onto the create call.
258 */
259static int
260nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
261 dev_t rdev)
262{
263 struct nfs_createdata *data;
264 struct rpc_message msg = {
265 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
266 };
267 umode_t mode;
268 int status = -ENOMEM;
269
270 dprintk("NFS call mknod %pd\n", dentry);
271
272 mode = sattr->ia_mode;
273 if (S_ISFIFO(mode)) {
274 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
275 sattr->ia_valid &= ~ATTR_SIZE;
276 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
277 sattr->ia_valid |= ATTR_SIZE;
278 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
279 }
280
281 data = nfs_alloc_createdata(dir, dentry, sattr);
282 if (data == NULL)
283 goto out;
284 msg.rpc_argp = &data->arg;
285 msg.rpc_resp = &data->res;
286
287 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
288 nfs_mark_for_revalidate(dir);
289
290 if (status == -EINVAL && S_ISFIFO(mode)) {
291 sattr->ia_mode = mode;
292 nfs_fattr_init(data->res.fattr);
293 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
294 }
295 if (status == 0)
296 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
297 nfs_free_createdata(data);
298out:
299 dprintk("NFS reply mknod: %d\n", status);
300 return status;
301}
302
303static int
304nfs_proc_remove(struct inode *dir, struct dentry *dentry)
305{
306 struct nfs_removeargs arg = {
307 .fh = NFS_FH(dir),
308 .name = dentry->d_name,
309 };
310 struct rpc_message msg = {
311 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
312 .rpc_argp = &arg,
313 };
314 int status;
315
316 dprintk("NFS call remove %pd2\n",dentry);
317 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
318 nfs_mark_for_revalidate(dir);
319
320 dprintk("NFS reply remove: %d\n", status);
321 return status;
322}
323
324static void
325nfs_proc_unlink_setup(struct rpc_message *msg,
326 struct dentry *dentry,
327 struct inode *inode)
328{
329 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
330}
331
332static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
333{
334 rpc_call_start(task);
335}
336
337static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
338{
339 nfs_mark_for_revalidate(dir);
340 return 1;
341}
342
343static void
344nfs_proc_rename_setup(struct rpc_message *msg,
345 struct dentry *old_dentry,
346 struct dentry *new_dentry)
347{
348 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
349}
350
351static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
352{
353 rpc_call_start(task);
354}
355
356static int
357nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
358 struct inode *new_dir)
359{
360 nfs_mark_for_revalidate(old_dir);
361 nfs_mark_for_revalidate(new_dir);
362 return 1;
363}
364
365static int
366nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
367{
368 struct nfs_linkargs arg = {
369 .fromfh = NFS_FH(inode),
370 .tofh = NFS_FH(dir),
371 .toname = name->name,
372 .tolen = name->len
373 };
374 struct rpc_message msg = {
375 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
376 .rpc_argp = &arg,
377 };
378 int status;
379
380 dprintk("NFS call link %s\n", name->name);
381 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
382 nfs_mark_for_revalidate(inode);
383 nfs_mark_for_revalidate(dir);
384 dprintk("NFS reply link: %d\n", status);
385 return status;
386}
387
388static int
389nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
390 unsigned int len, struct iattr *sattr)
391{
392 struct nfs_fh *fh;
393 struct nfs_fattr *fattr;
394 struct nfs_symlinkargs arg = {
395 .fromfh = NFS_FH(dir),
396 .fromname = dentry->d_name.name,
397 .fromlen = dentry->d_name.len,
398 .pages = &page,
399 .pathlen = len,
400 .sattr = sattr
401 };
402 struct rpc_message msg = {
403 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
404 .rpc_argp = &arg,
405 };
406 int status = -ENAMETOOLONG;
407
408 dprintk("NFS call symlink %pd\n", dentry);
409
410 if (len > NFS2_MAXPATHLEN)
411 goto out;
412
413 fh = nfs_alloc_fhandle();
414 fattr = nfs_alloc_fattr();
415 status = -ENOMEM;
416 if (fh == NULL || fattr == NULL)
417 goto out_free;
418
419 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
420 nfs_mark_for_revalidate(dir);
421
422 /*
423 * V2 SYMLINK requests don't return any attributes. Setting the
424 * filehandle size to zero indicates to nfs_instantiate that it
425 * should fill in the data with a LOOKUP call on the wire.
426 */
427 if (status == 0)
428 status = nfs_instantiate(dentry, fh, fattr, NULL);
429
430out_free:
431 nfs_free_fattr(fattr);
432 nfs_free_fhandle(fh);
433out:
434 dprintk("NFS reply symlink: %d\n", status);
435 return status;
436}
437
438static int
439nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
440{
441 struct nfs_createdata *data;
442 struct rpc_message msg = {
443 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
444 };
445 int status = -ENOMEM;
446
447 dprintk("NFS call mkdir %pd\n", dentry);
448 data = nfs_alloc_createdata(dir, dentry, sattr);
449 if (data == NULL)
450 goto out;
451 msg.rpc_argp = &data->arg;
452 msg.rpc_resp = &data->res;
453
454 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
455 nfs_mark_for_revalidate(dir);
456 if (status == 0)
457 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
458 nfs_free_createdata(data);
459out:
460 dprintk("NFS reply mkdir: %d\n", status);
461 return status;
462}
463
464static int
465nfs_proc_rmdir(struct inode *dir, const struct qstr *name)
466{
467 struct nfs_diropargs arg = {
468 .fh = NFS_FH(dir),
469 .name = name->name,
470 .len = name->len
471 };
472 struct rpc_message msg = {
473 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
474 .rpc_argp = &arg,
475 };
476 int status;
477
478 dprintk("NFS call rmdir %s\n", name->name);
479 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
480 nfs_mark_for_revalidate(dir);
481 dprintk("NFS reply rmdir: %d\n", status);
482 return status;
483}
484
485/*
486 * The READDIR implementation is somewhat hackish - we pass a temporary
487 * buffer to the encode function, which installs it in the receive
488 * the receive iovec. The decode function just parses the reply to make
489 * sure it is syntactically correct; the entries itself are decoded
490 * from nfs_readdir by calling the decode_entry function directly.
491 */
492static int
493nfs_proc_readdir(struct dentry *dentry, const struct cred *cred,
494 u64 cookie, struct page **pages, unsigned int count, bool plus)
495{
496 struct inode *dir = d_inode(dentry);
497 struct nfs_readdirargs arg = {
498 .fh = NFS_FH(dir),
499 .cookie = cookie,
500 .count = count,
501 .pages = pages,
502 };
503 struct rpc_message msg = {
504 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
505 .rpc_argp = &arg,
506 .rpc_cred = cred,
507 };
508 int status;
509
510 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
511 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
512
513 nfs_invalidate_atime(dir);
514
515 dprintk("NFS reply readdir: %d\n", status);
516 return status;
517}
518
519static int
520nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
521 struct nfs_fsstat *stat)
522{
523 struct nfs2_fsstat fsinfo;
524 struct rpc_message msg = {
525 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
526 .rpc_argp = fhandle,
527 .rpc_resp = &fsinfo,
528 };
529 int status;
530
531 dprintk("NFS call statfs\n");
532 nfs_fattr_init(stat->fattr);
533 status = rpc_call_sync(server->client, &msg, 0);
534 dprintk("NFS reply statfs: %d\n", status);
535 if (status)
536 goto out;
537 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
538 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
539 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
540 stat->tfiles = 0;
541 stat->ffiles = 0;
542 stat->afiles = 0;
543out:
544 return status;
545}
546
547static int
548nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
549 struct nfs_fsinfo *info)
550{
551 struct nfs2_fsstat fsinfo;
552 struct rpc_message msg = {
553 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
554 .rpc_argp = fhandle,
555 .rpc_resp = &fsinfo,
556 };
557 int status;
558
559 dprintk("NFS call fsinfo\n");
560 nfs_fattr_init(info->fattr);
561 status = rpc_call_sync(server->client, &msg, 0);
562 dprintk("NFS reply fsinfo: %d\n", status);
563 if (status)
564 goto out;
565 info->rtmax = NFS_MAXDATA;
566 info->rtpref = fsinfo.tsize;
567 info->rtmult = fsinfo.bsize;
568 info->wtmax = NFS_MAXDATA;
569 info->wtpref = fsinfo.tsize;
570 info->wtmult = fsinfo.bsize;
571 info->dtpref = fsinfo.tsize;
572 info->maxfilesize = 0x7FFFFFFF;
573 info->lease_time = 0;
574out:
575 return status;
576}
577
578static int
579nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
580 struct nfs_pathconf *info)
581{
582 info->max_link = 0;
583 info->max_namelen = NFS2_MAXNAMLEN;
584 return 0;
585}
586
587static int nfs_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
588{
589 struct inode *inode = hdr->inode;
590
591 nfs_invalidate_atime(inode);
592 if (task->tk_status >= 0) {
593 nfs_refresh_inode(inode, hdr->res.fattr);
594 /* Emulate the eof flag, which isn't normally needed in NFSv2
595 * as it is guaranteed to always return the file attributes
596 */
597 if ((hdr->res.count == 0 && hdr->args.count > 0) ||
598 hdr->args.offset + hdr->res.count >= hdr->res.fattr->size)
599 hdr->res.eof = 1;
600 }
601 return 0;
602}
603
604static void nfs_proc_read_setup(struct nfs_pgio_header *hdr,
605 struct rpc_message *msg)
606{
607 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
608}
609
610static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task,
611 struct nfs_pgio_header *hdr)
612{
613 rpc_call_start(task);
614 return 0;
615}
616
617static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
618{
619 if (task->tk_status >= 0) {
620 hdr->res.count = hdr->args.count;
621 nfs_writeback_update_inode(hdr);
622 }
623 return 0;
624}
625
626static void nfs_proc_write_setup(struct nfs_pgio_header *hdr,
627 struct rpc_message *msg,
628 struct rpc_clnt **clnt)
629{
630 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
631 hdr->args.stable = NFS_FILE_SYNC;
632 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
633}
634
635static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
636{
637 BUG();
638}
639
640static void
641nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
642 struct rpc_clnt **clnt)
643{
644 BUG();
645}
646
647static int
648nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
649{
650 struct inode *inode = file_inode(filp);
651
652 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, NULL);
653}
654
655/* Helper functions for NFS lock bounds checking */
656#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
657static int nfs_lock_check_bounds(const struct file_lock *fl)
658{
659 __s32 start, end;
660
661 start = (__s32)fl->fl_start;
662 if ((loff_t)start != fl->fl_start)
663 goto out_einval;
664
665 if (fl->fl_end != OFFSET_MAX) {
666 end = (__s32)fl->fl_end;
667 if ((loff_t)end != fl->fl_end)
668 goto out_einval;
669 } else
670 end = NFS_LOCK32_OFFSET_MAX;
671
672 if (start < 0 || start > end)
673 goto out_einval;
674 return 0;
675out_einval:
676 return -EINVAL;
677}
678
679static int nfs_have_delegation(struct inode *inode, fmode_t flags)
680{
681 return 0;
682}
683
684static const struct inode_operations nfs_dir_inode_operations = {
685 .create = nfs_create,
686 .lookup = nfs_lookup,
687 .link = nfs_link,
688 .unlink = nfs_unlink,
689 .symlink = nfs_symlink,
690 .mkdir = nfs_mkdir,
691 .rmdir = nfs_rmdir,
692 .mknod = nfs_mknod,
693 .rename = nfs_rename,
694 .permission = nfs_permission,
695 .getattr = nfs_getattr,
696 .setattr = nfs_setattr,
697};
698
699static const struct inode_operations nfs_file_inode_operations = {
700 .permission = nfs_permission,
701 .getattr = nfs_getattr,
702 .setattr = nfs_setattr,
703};
704
705const struct nfs_rpc_ops nfs_v2_clientops = {
706 .version = 2, /* protocol version */
707 .dentry_ops = &nfs_dentry_operations,
708 .dir_inode_ops = &nfs_dir_inode_operations,
709 .file_inode_ops = &nfs_file_inode_operations,
710 .file_ops = &nfs_file_operations,
711 .getroot = nfs_proc_get_root,
712 .submount = nfs_submount,
713 .try_mount = nfs_try_mount,
714 .getattr = nfs_proc_getattr,
715 .setattr = nfs_proc_setattr,
716 .lookup = nfs_proc_lookup,
717 .access = NULL, /* access */
718 .readlink = nfs_proc_readlink,
719 .create = nfs_proc_create,
720 .remove = nfs_proc_remove,
721 .unlink_setup = nfs_proc_unlink_setup,
722 .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
723 .unlink_done = nfs_proc_unlink_done,
724 .rename_setup = nfs_proc_rename_setup,
725 .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
726 .rename_done = nfs_proc_rename_done,
727 .link = nfs_proc_link,
728 .symlink = nfs_proc_symlink,
729 .mkdir = nfs_proc_mkdir,
730 .rmdir = nfs_proc_rmdir,
731 .readdir = nfs_proc_readdir,
732 .mknod = nfs_proc_mknod,
733 .statfs = nfs_proc_statfs,
734 .fsinfo = nfs_proc_fsinfo,
735 .pathconf = nfs_proc_pathconf,
736 .decode_dirent = nfs2_decode_dirent,
737 .pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare,
738 .read_setup = nfs_proc_read_setup,
739 .read_done = nfs_read_done,
740 .write_setup = nfs_proc_write_setup,
741 .write_done = nfs_write_done,
742 .commit_setup = nfs_proc_commit_setup,
743 .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
744 .lock = nfs_proc_lock,
745 .lock_check_bounds = nfs_lock_check_bounds,
746 .close_context = nfs_close_context,
747 .have_delegation = nfs_have_delegation,
748 .alloc_client = nfs_alloc_client,
749 .init_client = nfs_init_client,
750 .free_client = nfs_free_client,
751 .create_server = nfs_create_server,
752 .clone_server = nfs_clone_server,
753};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/proc.c
4 *
5 * Copyright (C) 1992, 1993, 1994 Rick Sladkey
6 *
7 * OS-independent nfs remote procedure call functions
8 *
9 * Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
10 * so at last we can have decent(ish) throughput off a
11 * Sun server.
12 *
13 * Coding optimized and cleaned up by Florian La Roche.
14 * Note: Error returns are optimized for NFS_OK, which isn't translated via
15 * nfs_stat_to_errno(), but happens to be already the right return code.
16 *
17 * Also, the code currently doesn't check the size of the packet, when
18 * it decodes the packet.
19 *
20 * Feel free to fix it and mail me the diffs if it worries you.
21 *
22 * Completely rewritten to support the new RPC call interface;
23 * rewrote and moved the entire XDR stuff to xdr.c
24 * --Olaf Kirch June 1996
25 *
26 * The code below initializes all auto variables explicitly, otherwise
27 * it will fail to work as a module (gcc generates a memset call for an
28 * incomplete struct).
29 */
30
31#include <linux/types.h>
32#include <linux/param.h>
33#include <linux/time.h>
34#include <linux/mm.h>
35#include <linux/errno.h>
36#include <linux/string.h>
37#include <linux/in.h>
38#include <linux/pagemap.h>
39#include <linux/sunrpc/clnt.h>
40#include <linux/nfs.h>
41#include <linux/nfs2.h>
42#include <linux/nfs_fs.h>
43#include <linux/nfs_page.h>
44#include <linux/lockd/bind.h>
45#include <linux/freezer.h>
46#include "internal.h"
47
48#define NFSDBG_FACILITY NFSDBG_PROC
49
50/*
51 * Bare-bones access to getattr: this is for nfs_read_super.
52 */
53static int
54nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
55 struct nfs_fsinfo *info)
56{
57 struct nfs_fattr *fattr = info->fattr;
58 struct nfs2_fsstat fsinfo;
59 struct rpc_message msg = {
60 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
61 .rpc_argp = fhandle,
62 .rpc_resp = fattr,
63 };
64 int status;
65
66 dprintk("%s: call getattr\n", __func__);
67 nfs_fattr_init(fattr);
68 status = rpc_call_sync(server->client, &msg, 0);
69 /* Retry with default authentication if different */
70 if (status && server->nfs_client->cl_rpcclient != server->client)
71 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
72 dprintk("%s: reply getattr: %d\n", __func__, status);
73 if (status)
74 return status;
75 dprintk("%s: call statfs\n", __func__);
76 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
77 msg.rpc_resp = &fsinfo;
78 status = rpc_call_sync(server->client, &msg, 0);
79 /* Retry with default authentication if different */
80 if (status && server->nfs_client->cl_rpcclient != server->client)
81 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
82 dprintk("%s: reply statfs: %d\n", __func__, status);
83 if (status)
84 return status;
85 info->rtmax = NFS_MAXDATA;
86 info->rtpref = fsinfo.tsize;
87 info->rtmult = fsinfo.bsize;
88 info->wtmax = NFS_MAXDATA;
89 info->wtpref = fsinfo.tsize;
90 info->wtmult = fsinfo.bsize;
91 info->dtpref = fsinfo.tsize;
92 info->maxfilesize = 0x7FFFFFFF;
93 info->lease_time = 0;
94 return 0;
95}
96
97/*
98 * One function for each procedure in the NFS protocol.
99 */
100static int
101nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
102 struct nfs_fattr *fattr, struct nfs4_label *label,
103 struct inode *inode)
104{
105 struct rpc_message msg = {
106 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
107 .rpc_argp = fhandle,
108 .rpc_resp = fattr,
109 };
110 int status;
111 unsigned short task_flags = 0;
112
113 /* Is this is an attribute revalidation, subject to softreval? */
114 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
115 task_flags |= RPC_TASK_TIMEOUT;
116
117 dprintk("NFS call getattr\n");
118 nfs_fattr_init(fattr);
119 status = rpc_call_sync(server->client, &msg, task_flags);
120 dprintk("NFS reply getattr: %d\n", status);
121 return status;
122}
123
124static int
125nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
126 struct iattr *sattr)
127{
128 struct inode *inode = d_inode(dentry);
129 struct nfs_sattrargs arg = {
130 .fh = NFS_FH(inode),
131 .sattr = sattr
132 };
133 struct rpc_message msg = {
134 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
135 .rpc_argp = &arg,
136 .rpc_resp = fattr,
137 };
138 int status;
139
140 /* Mask out the non-modebit related stuff from attr->ia_mode */
141 sattr->ia_mode &= S_IALLUGO;
142
143 dprintk("NFS call setattr\n");
144 if (sattr->ia_valid & ATTR_FILE)
145 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
146 nfs_fattr_init(fattr);
147 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
148 if (status == 0)
149 nfs_setattr_update_inode(inode, sattr, fattr);
150 dprintk("NFS reply setattr: %d\n", status);
151 return status;
152}
153
154static int
155nfs_proc_lookup(struct inode *dir, struct dentry *dentry,
156 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
157 struct nfs4_label *label)
158{
159 struct nfs_diropargs arg = {
160 .fh = NFS_FH(dir),
161 .name = dentry->d_name.name,
162 .len = dentry->d_name.len
163 };
164 struct nfs_diropok res = {
165 .fh = fhandle,
166 .fattr = fattr
167 };
168 struct rpc_message msg = {
169 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
170 .rpc_argp = &arg,
171 .rpc_resp = &res,
172 };
173 int status;
174 unsigned short task_flags = 0;
175
176 /* Is this is an attribute revalidation, subject to softreval? */
177 if (nfs_lookup_is_soft_revalidate(dentry))
178 task_flags |= RPC_TASK_TIMEOUT;
179
180 dprintk("NFS call lookup %pd2\n", dentry);
181 nfs_fattr_init(fattr);
182 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
183 dprintk("NFS reply lookup: %d\n", status);
184 return status;
185}
186
187static int nfs_proc_readlink(struct inode *inode, struct page *page,
188 unsigned int pgbase, unsigned int pglen)
189{
190 struct nfs_readlinkargs args = {
191 .fh = NFS_FH(inode),
192 .pgbase = pgbase,
193 .pglen = pglen,
194 .pages = &page
195 };
196 struct rpc_message msg = {
197 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
198 .rpc_argp = &args,
199 };
200 int status;
201
202 dprintk("NFS call readlink\n");
203 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
204 dprintk("NFS reply readlink: %d\n", status);
205 return status;
206}
207
208struct nfs_createdata {
209 struct nfs_createargs arg;
210 struct nfs_diropok res;
211 struct nfs_fh fhandle;
212 struct nfs_fattr fattr;
213};
214
215static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
216 struct dentry *dentry, struct iattr *sattr)
217{
218 struct nfs_createdata *data;
219
220 data = kmalloc(sizeof(*data), GFP_KERNEL);
221
222 if (data != NULL) {
223 data->arg.fh = NFS_FH(dir);
224 data->arg.name = dentry->d_name.name;
225 data->arg.len = dentry->d_name.len;
226 data->arg.sattr = sattr;
227 nfs_fattr_init(&data->fattr);
228 data->fhandle.size = 0;
229 data->res.fh = &data->fhandle;
230 data->res.fattr = &data->fattr;
231 }
232 return data;
233};
234
235static void nfs_free_createdata(const struct nfs_createdata *data)
236{
237 kfree(data);
238}
239
240static int
241nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
242 int flags)
243{
244 struct nfs_createdata *data;
245 struct rpc_message msg = {
246 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
247 };
248 int status = -ENOMEM;
249
250 dprintk("NFS call create %pd\n", dentry);
251 data = nfs_alloc_createdata(dir, dentry, sattr);
252 if (data == NULL)
253 goto out;
254 msg.rpc_argp = &data->arg;
255 msg.rpc_resp = &data->res;
256 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
257 nfs_mark_for_revalidate(dir);
258 if (status == 0)
259 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
260 nfs_free_createdata(data);
261out:
262 dprintk("NFS reply create: %d\n", status);
263 return status;
264}
265
266/*
267 * In NFSv2, mknod is grafted onto the create call.
268 */
269static int
270nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
271 dev_t rdev)
272{
273 struct nfs_createdata *data;
274 struct rpc_message msg = {
275 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
276 };
277 umode_t mode;
278 int status = -ENOMEM;
279
280 dprintk("NFS call mknod %pd\n", dentry);
281
282 mode = sattr->ia_mode;
283 if (S_ISFIFO(mode)) {
284 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
285 sattr->ia_valid &= ~ATTR_SIZE;
286 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
287 sattr->ia_valid |= ATTR_SIZE;
288 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
289 }
290
291 data = nfs_alloc_createdata(dir, dentry, sattr);
292 if (data == NULL)
293 goto out;
294 msg.rpc_argp = &data->arg;
295 msg.rpc_resp = &data->res;
296
297 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
298 nfs_mark_for_revalidate(dir);
299
300 if (status == -EINVAL && S_ISFIFO(mode)) {
301 sattr->ia_mode = mode;
302 nfs_fattr_init(data->res.fattr);
303 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
304 }
305 if (status == 0)
306 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
307 nfs_free_createdata(data);
308out:
309 dprintk("NFS reply mknod: %d\n", status);
310 return status;
311}
312
313static int
314nfs_proc_remove(struct inode *dir, struct dentry *dentry)
315{
316 struct nfs_removeargs arg = {
317 .fh = NFS_FH(dir),
318 .name = dentry->d_name,
319 };
320 struct rpc_message msg = {
321 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
322 .rpc_argp = &arg,
323 };
324 int status;
325
326 dprintk("NFS call remove %pd2\n",dentry);
327 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
328 nfs_mark_for_revalidate(dir);
329
330 dprintk("NFS reply remove: %d\n", status);
331 return status;
332}
333
334static void
335nfs_proc_unlink_setup(struct rpc_message *msg,
336 struct dentry *dentry,
337 struct inode *inode)
338{
339 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
340}
341
342static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
343{
344 rpc_call_start(task);
345}
346
347static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
348{
349 nfs_mark_for_revalidate(dir);
350 return 1;
351}
352
353static void
354nfs_proc_rename_setup(struct rpc_message *msg,
355 struct dentry *old_dentry,
356 struct dentry *new_dentry)
357{
358 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
359}
360
361static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
362{
363 rpc_call_start(task);
364}
365
366static int
367nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
368 struct inode *new_dir)
369{
370 nfs_mark_for_revalidate(old_dir);
371 nfs_mark_for_revalidate(new_dir);
372 return 1;
373}
374
375static int
376nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
377{
378 struct nfs_linkargs arg = {
379 .fromfh = NFS_FH(inode),
380 .tofh = NFS_FH(dir),
381 .toname = name->name,
382 .tolen = name->len
383 };
384 struct rpc_message msg = {
385 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
386 .rpc_argp = &arg,
387 };
388 int status;
389
390 dprintk("NFS call link %s\n", name->name);
391 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
392 nfs_mark_for_revalidate(inode);
393 nfs_mark_for_revalidate(dir);
394 dprintk("NFS reply link: %d\n", status);
395 return status;
396}
397
398static int
399nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
400 unsigned int len, struct iattr *sattr)
401{
402 struct nfs_fh *fh;
403 struct nfs_fattr *fattr;
404 struct nfs_symlinkargs arg = {
405 .fromfh = NFS_FH(dir),
406 .fromname = dentry->d_name.name,
407 .fromlen = dentry->d_name.len,
408 .pages = &page,
409 .pathlen = len,
410 .sattr = sattr
411 };
412 struct rpc_message msg = {
413 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
414 .rpc_argp = &arg,
415 };
416 int status = -ENAMETOOLONG;
417
418 dprintk("NFS call symlink %pd\n", dentry);
419
420 if (len > NFS2_MAXPATHLEN)
421 goto out;
422
423 fh = nfs_alloc_fhandle();
424 fattr = nfs_alloc_fattr();
425 status = -ENOMEM;
426 if (fh == NULL || fattr == NULL)
427 goto out_free;
428
429 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
430 nfs_mark_for_revalidate(dir);
431
432 /*
433 * V2 SYMLINK requests don't return any attributes. Setting the
434 * filehandle size to zero indicates to nfs_instantiate that it
435 * should fill in the data with a LOOKUP call on the wire.
436 */
437 if (status == 0)
438 status = nfs_instantiate(dentry, fh, fattr, NULL);
439
440out_free:
441 nfs_free_fattr(fattr);
442 nfs_free_fhandle(fh);
443out:
444 dprintk("NFS reply symlink: %d\n", status);
445 return status;
446}
447
448static int
449nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
450{
451 struct nfs_createdata *data;
452 struct rpc_message msg = {
453 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
454 };
455 int status = -ENOMEM;
456
457 dprintk("NFS call mkdir %pd\n", dentry);
458 data = nfs_alloc_createdata(dir, dentry, sattr);
459 if (data == NULL)
460 goto out;
461 msg.rpc_argp = &data->arg;
462 msg.rpc_resp = &data->res;
463
464 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
465 nfs_mark_for_revalidate(dir);
466 if (status == 0)
467 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
468 nfs_free_createdata(data);
469out:
470 dprintk("NFS reply mkdir: %d\n", status);
471 return status;
472}
473
474static int
475nfs_proc_rmdir(struct inode *dir, const struct qstr *name)
476{
477 struct nfs_diropargs arg = {
478 .fh = NFS_FH(dir),
479 .name = name->name,
480 .len = name->len
481 };
482 struct rpc_message msg = {
483 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
484 .rpc_argp = &arg,
485 };
486 int status;
487
488 dprintk("NFS call rmdir %s\n", name->name);
489 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
490 nfs_mark_for_revalidate(dir);
491 dprintk("NFS reply rmdir: %d\n", status);
492 return status;
493}
494
495/*
496 * The READDIR implementation is somewhat hackish - we pass a temporary
497 * buffer to the encode function, which installs it in the receive
498 * the receive iovec. The decode function just parses the reply to make
499 * sure it is syntactically correct; the entries itself are decoded
500 * from nfs_readdir by calling the decode_entry function directly.
501 */
502static int
503nfs_proc_readdir(struct dentry *dentry, const struct cred *cred,
504 u64 cookie, struct page **pages, unsigned int count, bool plus)
505{
506 struct inode *dir = d_inode(dentry);
507 struct nfs_readdirargs arg = {
508 .fh = NFS_FH(dir),
509 .cookie = cookie,
510 .count = count,
511 .pages = pages,
512 };
513 struct rpc_message msg = {
514 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
515 .rpc_argp = &arg,
516 .rpc_cred = cred,
517 };
518 int status;
519
520 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
521 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
522
523 nfs_invalidate_atime(dir);
524
525 dprintk("NFS reply readdir: %d\n", status);
526 return status;
527}
528
529static int
530nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
531 struct nfs_fsstat *stat)
532{
533 struct nfs2_fsstat fsinfo;
534 struct rpc_message msg = {
535 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
536 .rpc_argp = fhandle,
537 .rpc_resp = &fsinfo,
538 };
539 int status;
540
541 dprintk("NFS call statfs\n");
542 nfs_fattr_init(stat->fattr);
543 status = rpc_call_sync(server->client, &msg, 0);
544 dprintk("NFS reply statfs: %d\n", status);
545 if (status)
546 goto out;
547 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
548 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
549 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
550 stat->tfiles = 0;
551 stat->ffiles = 0;
552 stat->afiles = 0;
553out:
554 return status;
555}
556
557static int
558nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
559 struct nfs_fsinfo *info)
560{
561 struct nfs2_fsstat fsinfo;
562 struct rpc_message msg = {
563 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
564 .rpc_argp = fhandle,
565 .rpc_resp = &fsinfo,
566 };
567 int status;
568
569 dprintk("NFS call fsinfo\n");
570 nfs_fattr_init(info->fattr);
571 status = rpc_call_sync(server->client, &msg, 0);
572 dprintk("NFS reply fsinfo: %d\n", status);
573 if (status)
574 goto out;
575 info->rtmax = NFS_MAXDATA;
576 info->rtpref = fsinfo.tsize;
577 info->rtmult = fsinfo.bsize;
578 info->wtmax = NFS_MAXDATA;
579 info->wtpref = fsinfo.tsize;
580 info->wtmult = fsinfo.bsize;
581 info->dtpref = fsinfo.tsize;
582 info->maxfilesize = 0x7FFFFFFF;
583 info->lease_time = 0;
584out:
585 return status;
586}
587
588static int
589nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
590 struct nfs_pathconf *info)
591{
592 info->max_link = 0;
593 info->max_namelen = NFS2_MAXNAMLEN;
594 return 0;
595}
596
597static int nfs_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
598{
599 struct inode *inode = hdr->inode;
600
601 nfs_invalidate_atime(inode);
602 if (task->tk_status >= 0) {
603 nfs_refresh_inode(inode, hdr->res.fattr);
604 /* Emulate the eof flag, which isn't normally needed in NFSv2
605 * as it is guaranteed to always return the file attributes
606 */
607 if ((hdr->res.count == 0 && hdr->args.count > 0) ||
608 hdr->args.offset + hdr->res.count >= hdr->res.fattr->size)
609 hdr->res.eof = 1;
610 }
611 return 0;
612}
613
614static void nfs_proc_read_setup(struct nfs_pgio_header *hdr,
615 struct rpc_message *msg)
616{
617 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
618}
619
620static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task,
621 struct nfs_pgio_header *hdr)
622{
623 rpc_call_start(task);
624 return 0;
625}
626
627static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
628{
629 if (task->tk_status >= 0) {
630 hdr->res.count = hdr->args.count;
631 nfs_writeback_update_inode(hdr);
632 }
633 return 0;
634}
635
636static void nfs_proc_write_setup(struct nfs_pgio_header *hdr,
637 struct rpc_message *msg,
638 struct rpc_clnt **clnt)
639{
640 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
641 hdr->args.stable = NFS_FILE_SYNC;
642 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
643}
644
645static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
646{
647 BUG();
648}
649
650static void
651nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
652 struct rpc_clnt **clnt)
653{
654 BUG();
655}
656
657static int
658nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
659{
660 struct inode *inode = file_inode(filp);
661
662 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, NULL);
663}
664
665/* Helper functions for NFS lock bounds checking */
666#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
667static int nfs_lock_check_bounds(const struct file_lock *fl)
668{
669 __s32 start, end;
670
671 start = (__s32)fl->fl_start;
672 if ((loff_t)start != fl->fl_start)
673 goto out_einval;
674
675 if (fl->fl_end != OFFSET_MAX) {
676 end = (__s32)fl->fl_end;
677 if ((loff_t)end != fl->fl_end)
678 goto out_einval;
679 } else
680 end = NFS_LOCK32_OFFSET_MAX;
681
682 if (start < 0 || start > end)
683 goto out_einval;
684 return 0;
685out_einval:
686 return -EINVAL;
687}
688
689static int nfs_have_delegation(struct inode *inode, fmode_t flags)
690{
691 return 0;
692}
693
694static const struct inode_operations nfs_dir_inode_operations = {
695 .create = nfs_create,
696 .lookup = nfs_lookup,
697 .link = nfs_link,
698 .unlink = nfs_unlink,
699 .symlink = nfs_symlink,
700 .mkdir = nfs_mkdir,
701 .rmdir = nfs_rmdir,
702 .mknod = nfs_mknod,
703 .rename = nfs_rename,
704 .permission = nfs_permission,
705 .getattr = nfs_getattr,
706 .setattr = nfs_setattr,
707};
708
709static const struct inode_operations nfs_file_inode_operations = {
710 .permission = nfs_permission,
711 .getattr = nfs_getattr,
712 .setattr = nfs_setattr,
713};
714
715const struct nfs_rpc_ops nfs_v2_clientops = {
716 .version = 2, /* protocol version */
717 .dentry_ops = &nfs_dentry_operations,
718 .dir_inode_ops = &nfs_dir_inode_operations,
719 .file_inode_ops = &nfs_file_inode_operations,
720 .file_ops = &nfs_file_operations,
721 .getroot = nfs_proc_get_root,
722 .submount = nfs_submount,
723 .try_get_tree = nfs_try_get_tree,
724 .getattr = nfs_proc_getattr,
725 .setattr = nfs_proc_setattr,
726 .lookup = nfs_proc_lookup,
727 .access = NULL, /* access */
728 .readlink = nfs_proc_readlink,
729 .create = nfs_proc_create,
730 .remove = nfs_proc_remove,
731 .unlink_setup = nfs_proc_unlink_setup,
732 .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
733 .unlink_done = nfs_proc_unlink_done,
734 .rename_setup = nfs_proc_rename_setup,
735 .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
736 .rename_done = nfs_proc_rename_done,
737 .link = nfs_proc_link,
738 .symlink = nfs_proc_symlink,
739 .mkdir = nfs_proc_mkdir,
740 .rmdir = nfs_proc_rmdir,
741 .readdir = nfs_proc_readdir,
742 .mknod = nfs_proc_mknod,
743 .statfs = nfs_proc_statfs,
744 .fsinfo = nfs_proc_fsinfo,
745 .pathconf = nfs_proc_pathconf,
746 .decode_dirent = nfs2_decode_dirent,
747 .pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare,
748 .read_setup = nfs_proc_read_setup,
749 .read_done = nfs_read_done,
750 .write_setup = nfs_proc_write_setup,
751 .write_done = nfs_write_done,
752 .commit_setup = nfs_proc_commit_setup,
753 .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
754 .lock = nfs_proc_lock,
755 .lock_check_bounds = nfs_lock_check_bounds,
756 .close_context = nfs_close_context,
757 .have_delegation = nfs_have_delegation,
758 .alloc_client = nfs_alloc_client,
759 .init_client = nfs_init_client,
760 .free_client = nfs_free_client,
761 .create_server = nfs_create_server,
762 .clone_server = nfs_clone_server,
763};