xref: /linux/fs/nfs/proc.c (revision 5c8166419acf468b5bc3e48f928a040485d3e0c2)
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  */
53 static int
54 nfs_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 	info->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
95 	return 0;
96 }
97 
98 /*
99  * One function for each procedure in the NFS protocol.
100  */
101 static int
102 nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
103 		struct nfs_fattr *fattr, 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 
124 static int
125 nfs_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 
154 static int
155 nfs_proc_lookup(struct inode *dir, struct dentry *dentry,
156 		struct nfs_fh *fhandle, struct nfs_fattr *fattr)
157 {
158 	struct nfs_diropargs	arg = {
159 		.fh		= NFS_FH(dir),
160 		.name		= dentry->d_name.name,
161 		.len		= dentry->d_name.len
162 	};
163 	struct nfs_diropok	res = {
164 		.fh		= fhandle,
165 		.fattr		= fattr
166 	};
167 	struct rpc_message msg = {
168 		.rpc_proc	= &nfs_procedures[NFSPROC_LOOKUP],
169 		.rpc_argp	= &arg,
170 		.rpc_resp	= &res,
171 	};
172 	int			status;
173 	unsigned short task_flags = 0;
174 
175 	/* Is this is an attribute revalidation, subject to softreval? */
176 	if (nfs_lookup_is_soft_revalidate(dentry))
177 		task_flags |= RPC_TASK_TIMEOUT;
178 
179 	dprintk("NFS call  lookup %pd2\n", dentry);
180 	nfs_fattr_init(fattr);
181 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
182 	dprintk("NFS reply lookup: %d\n", status);
183 	return status;
184 }
185 
186 static int nfs_proc_readlink(struct inode *inode, struct page *page,
187 		unsigned int pgbase, unsigned int pglen)
188 {
189 	struct nfs_readlinkargs	args = {
190 		.fh		= NFS_FH(inode),
191 		.pgbase		= pgbase,
192 		.pglen		= pglen,
193 		.pages		= &page
194 	};
195 	struct rpc_message msg = {
196 		.rpc_proc	= &nfs_procedures[NFSPROC_READLINK],
197 		.rpc_argp	= &args,
198 	};
199 	int			status;
200 
201 	dprintk("NFS call  readlink\n");
202 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
203 	dprintk("NFS reply readlink: %d\n", status);
204 	return status;
205 }
206 
207 struct nfs_createdata {
208 	struct nfs_createargs arg;
209 	struct nfs_diropok res;
210 	struct nfs_fh fhandle;
211 	struct nfs_fattr fattr;
212 };
213 
214 static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
215 		struct dentry *dentry, struct iattr *sattr)
216 {
217 	struct nfs_createdata *data;
218 
219 	data = kmalloc(sizeof(*data), GFP_KERNEL);
220 
221 	if (data != NULL) {
222 		data->arg.fh = NFS_FH(dir);
223 		data->arg.name = dentry->d_name.name;
224 		data->arg.len = dentry->d_name.len;
225 		data->arg.sattr = sattr;
226 		nfs_fattr_init(&data->fattr);
227 		data->fhandle.size = 0;
228 		data->res.fh = &data->fhandle;
229 		data->res.fattr = &data->fattr;
230 	}
231 	return data;
232 };
233 
234 static void nfs_free_createdata(const struct nfs_createdata *data)
235 {
236 	kfree(data);
237 }
238 
239 static int
240 nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
241 		int flags)
242 {
243 	struct nfs_createdata *data;
244 	struct rpc_message msg = {
245 		.rpc_proc	= &nfs_procedures[NFSPROC_CREATE],
246 	};
247 	int status = -ENOMEM;
248 
249 	dprintk("NFS call  create %pd\n", dentry);
250 	data = nfs_alloc_createdata(dir, dentry, sattr);
251 	if (data == NULL)
252 		goto out;
253 	msg.rpc_argp = &data->arg;
254 	msg.rpc_resp = &data->res;
255 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
256 	nfs_mark_for_revalidate(dir);
257 	if (status == 0)
258 		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
259 	nfs_free_createdata(data);
260 out:
261 	dprintk("NFS reply create: %d\n", status);
262 	return status;
263 }
264 
265 /*
266  * In NFSv2, mknod is grafted onto the create call.
267  */
268 static int
269 nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
270 	       dev_t rdev)
271 {
272 	struct nfs_createdata *data;
273 	struct rpc_message msg = {
274 		.rpc_proc	= &nfs_procedures[NFSPROC_CREATE],
275 	};
276 	umode_t mode;
277 	int status = -ENOMEM;
278 
279 	dprintk("NFS call  mknod %pd\n", dentry);
280 
281 	mode = sattr->ia_mode;
282 	if (S_ISFIFO(mode)) {
283 		sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
284 		sattr->ia_valid &= ~ATTR_SIZE;
285 	} else if (S_ISCHR(mode) || S_ISBLK(mode)) {
286 		sattr->ia_valid |= ATTR_SIZE;
287 		sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
288 	}
289 
290 	data = nfs_alloc_createdata(dir, dentry, sattr);
291 	if (data == NULL)
292 		goto out;
293 	msg.rpc_argp = &data->arg;
294 	msg.rpc_resp = &data->res;
295 
296 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
297 	nfs_mark_for_revalidate(dir);
298 
299 	if (status == -EINVAL && S_ISFIFO(mode)) {
300 		sattr->ia_mode = mode;
301 		nfs_fattr_init(data->res.fattr);
302 		status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
303 	}
304 	if (status == 0)
305 		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
306 	nfs_free_createdata(data);
307 out:
308 	dprintk("NFS reply mknod: %d\n", status);
309 	return status;
310 }
311 
312 static int
313 nfs_proc_remove(struct inode *dir, struct dentry *dentry)
314 {
315 	struct nfs_removeargs arg = {
316 		.fh = NFS_FH(dir),
317 		.name = dentry->d_name,
318 	};
319 	struct rpc_message msg = {
320 		.rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
321 		.rpc_argp = &arg,
322 	};
323 	int			status;
324 
325 	dprintk("NFS call  remove %pd2\n",dentry);
326 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
327 	nfs_mark_for_revalidate(dir);
328 
329 	dprintk("NFS reply remove: %d\n", status);
330 	return status;
331 }
332 
333 static void
334 nfs_proc_unlink_setup(struct rpc_message *msg,
335 		struct dentry *dentry,
336 		struct inode *inode)
337 {
338 	msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
339 }
340 
341 static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
342 {
343 	rpc_call_start(task);
344 }
345 
346 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
347 {
348 	nfs_mark_for_revalidate(dir);
349 	return 1;
350 }
351 
352 static void
353 nfs_proc_rename_setup(struct rpc_message *msg,
354 		struct dentry *old_dentry,
355 		struct dentry *new_dentry)
356 {
357 	msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
358 }
359 
360 static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
361 {
362 	rpc_call_start(task);
363 }
364 
365 static int
366 nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
367 		     struct inode *new_dir)
368 {
369 	nfs_mark_for_revalidate(old_dir);
370 	nfs_mark_for_revalidate(new_dir);
371 	return 1;
372 }
373 
374 static int
375 nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
376 {
377 	struct nfs_linkargs	arg = {
378 		.fromfh		= NFS_FH(inode),
379 		.tofh		= NFS_FH(dir),
380 		.toname		= name->name,
381 		.tolen		= name->len
382 	};
383 	struct rpc_message msg = {
384 		.rpc_proc	= &nfs_procedures[NFSPROC_LINK],
385 		.rpc_argp	= &arg,
386 	};
387 	int			status;
388 
389 	dprintk("NFS call  link %s\n", name->name);
390 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
391 	nfs_mark_for_revalidate(inode);
392 	nfs_mark_for_revalidate(dir);
393 	dprintk("NFS reply link: %d\n", status);
394 	return status;
395 }
396 
397 static int
398 nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
399 		 unsigned int len, struct iattr *sattr)
400 {
401 	struct nfs_fh *fh;
402 	struct nfs_fattr *fattr;
403 	struct nfs_symlinkargs	arg = {
404 		.fromfh		= NFS_FH(dir),
405 		.fromname	= dentry->d_name.name,
406 		.fromlen	= dentry->d_name.len,
407 		.pages		= &page,
408 		.pathlen	= len,
409 		.sattr		= sattr
410 	};
411 	struct rpc_message msg = {
412 		.rpc_proc	= &nfs_procedures[NFSPROC_SYMLINK],
413 		.rpc_argp	= &arg,
414 	};
415 	int status = -ENAMETOOLONG;
416 
417 	dprintk("NFS call  symlink %pd\n", dentry);
418 
419 	if (len > NFS2_MAXPATHLEN)
420 		goto out;
421 
422 	fh = nfs_alloc_fhandle();
423 	fattr = nfs_alloc_fattr();
424 	status = -ENOMEM;
425 	if (fh == NULL || fattr == NULL)
426 		goto out_free;
427 
428 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
429 	nfs_mark_for_revalidate(dir);
430 
431 	/*
432 	 * V2 SYMLINK requests don't return any attributes.  Setting the
433 	 * filehandle size to zero indicates to nfs_instantiate that it
434 	 * should fill in the data with a LOOKUP call on the wire.
435 	 */
436 	if (status == 0)
437 		status = nfs_instantiate(dentry, fh, fattr);
438 
439 out_free:
440 	nfs_free_fattr(fattr);
441 	nfs_free_fhandle(fh);
442 out:
443 	dprintk("NFS reply symlink: %d\n", status);
444 	return status;
445 }
446 
447 static int
448 nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
449 {
450 	struct nfs_createdata *data;
451 	struct rpc_message msg = {
452 		.rpc_proc	= &nfs_procedures[NFSPROC_MKDIR],
453 	};
454 	int status = -ENOMEM;
455 
456 	dprintk("NFS call  mkdir %pd\n", dentry);
457 	data = nfs_alloc_createdata(dir, dentry, sattr);
458 	if (data == NULL)
459 		goto out;
460 	msg.rpc_argp = &data->arg;
461 	msg.rpc_resp = &data->res;
462 
463 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
464 	nfs_mark_for_revalidate(dir);
465 	if (status == 0)
466 		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
467 	nfs_free_createdata(data);
468 out:
469 	dprintk("NFS reply mkdir: %d\n", status);
470 	return status;
471 }
472 
473 static int
474 nfs_proc_rmdir(struct inode *dir, const struct qstr *name)
475 {
476 	struct nfs_diropargs	arg = {
477 		.fh		= NFS_FH(dir),
478 		.name		= name->name,
479 		.len		= name->len
480 	};
481 	struct rpc_message msg = {
482 		.rpc_proc	= &nfs_procedures[NFSPROC_RMDIR],
483 		.rpc_argp	= &arg,
484 	};
485 	int			status;
486 
487 	dprintk("NFS call  rmdir %s\n", name->name);
488 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
489 	nfs_mark_for_revalidate(dir);
490 	dprintk("NFS reply rmdir: %d\n", status);
491 	return status;
492 }
493 
494 /*
495  * The READDIR implementation is somewhat hackish - we pass a temporary
496  * buffer to the encode function, which installs it in the receive
497  * the receive iovec. The decode function just parses the reply to make
498  * sure it is syntactically correct; the entries itself are decoded
499  * from nfs_readdir by calling the decode_entry function directly.
500  */
501 static int nfs_proc_readdir(struct nfs_readdir_arg *nr_arg,
502 			    struct nfs_readdir_res *nr_res)
503 {
504 	struct inode		*dir = d_inode(nr_arg->dentry);
505 	struct nfs_readdirargs	arg = {
506 		.fh		= NFS_FH(dir),
507 		.cookie		= nr_arg->cookie,
508 		.count		= nr_arg->page_len,
509 		.pages		= nr_arg->pages,
510 	};
511 	struct rpc_message	msg = {
512 		.rpc_proc	= &nfs_procedures[NFSPROC_READDIR],
513 		.rpc_argp	= &arg,
514 		.rpc_cred	= nr_arg->cred,
515 	};
516 	int			status;
517 
518 	dprintk("NFS call  readdir %llu\n", (unsigned long long)nr_arg->cookie);
519 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
520 	nr_res->verf[0] = nr_res->verf[1] = 0;
521 
522 	nfs_invalidate_atime(dir);
523 
524 	dprintk("NFS reply readdir: %d\n", status);
525 	return status;
526 }
527 
528 static int
529 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
530 			struct nfs_fsstat *stat)
531 {
532 	struct nfs2_fsstat fsinfo;
533 	struct rpc_message msg = {
534 		.rpc_proc	= &nfs_procedures[NFSPROC_STATFS],
535 		.rpc_argp	= fhandle,
536 		.rpc_resp	= &fsinfo,
537 	};
538 	int	status;
539 
540 	dprintk("NFS call  statfs\n");
541 	nfs_fattr_init(stat->fattr);
542 	status = rpc_call_sync(server->client, &msg, 0);
543 	dprintk("NFS reply statfs: %d\n", status);
544 	if (status)
545 		goto out;
546 	stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
547 	stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
548 	stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
549 	stat->tfiles = 0;
550 	stat->ffiles = 0;
551 	stat->afiles = 0;
552 out:
553 	return status;
554 }
555 
556 static int
557 nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
558 			struct nfs_fsinfo *info)
559 {
560 	struct nfs2_fsstat fsinfo;
561 	struct rpc_message msg = {
562 		.rpc_proc	= &nfs_procedures[NFSPROC_STATFS],
563 		.rpc_argp	= fhandle,
564 		.rpc_resp	= &fsinfo,
565 	};
566 	int	status;
567 
568 	dprintk("NFS call  fsinfo\n");
569 	nfs_fattr_init(info->fattr);
570 	status = rpc_call_sync(server->client, &msg, 0);
571 	dprintk("NFS reply fsinfo: %d\n", status);
572 	if (status)
573 		goto out;
574 	info->rtmax  = NFS_MAXDATA;
575 	info->rtpref = fsinfo.tsize;
576 	info->rtmult = fsinfo.bsize;
577 	info->wtmax  = NFS_MAXDATA;
578 	info->wtpref = fsinfo.tsize;
579 	info->wtmult = fsinfo.bsize;
580 	info->dtpref = fsinfo.tsize;
581 	info->maxfilesize = 0x7FFFFFFF;
582 	info->lease_time = 0;
583 out:
584 	return status;
585 }
586 
587 static int
588 nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
589 		  struct nfs_pathconf *info)
590 {
591 	info->max_link = 0;
592 	info->max_namelen = NFS2_MAXNAMLEN;
593 	return 0;
594 }
595 
596 static int nfs_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
597 {
598 	struct inode *inode = hdr->inode;
599 
600 	nfs_invalidate_atime(inode);
601 	if (task->tk_status >= 0) {
602 		nfs_refresh_inode(inode, hdr->res.fattr);
603 		/* Emulate the eof flag, which isn't normally needed in NFSv2
604 		 * as it is guaranteed to always return the file attributes
605 		 */
606 		if ((hdr->res.count == 0 && hdr->args.count > 0) ||
607 		    hdr->args.offset + hdr->res.count >= hdr->res.fattr->size)
608 			hdr->res.eof = 1;
609 	}
610 	return 0;
611 }
612 
613 static void nfs_proc_read_setup(struct nfs_pgio_header *hdr,
614 				struct rpc_message *msg)
615 {
616 	msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
617 }
618 
619 static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task,
620 				     struct nfs_pgio_header *hdr)
621 {
622 	rpc_call_start(task);
623 	return 0;
624 }
625 
626 static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
627 {
628 	if (task->tk_status >= 0) {
629 		hdr->res.count = hdr->args.count;
630 		nfs_writeback_update_inode(hdr);
631 	}
632 	return 0;
633 }
634 
635 static void nfs_proc_write_setup(struct nfs_pgio_header *hdr,
636 				 struct rpc_message *msg,
637 				 struct rpc_clnt **clnt)
638 {
639 	/* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
640 	hdr->args.stable = NFS_FILE_SYNC;
641 	msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
642 }
643 
644 static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
645 {
646 	BUG();
647 }
648 
649 static void
650 nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
651 			struct rpc_clnt **clnt)
652 {
653 	BUG();
654 }
655 
656 static int
657 nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
658 {
659 	struct inode *inode = file_inode(filp);
660 
661 	return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, NULL);
662 }
663 
664 /* Helper functions for NFS lock bounds checking */
665 #define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
666 static int nfs_lock_check_bounds(const struct file_lock *fl)
667 {
668 	__s32 start, end;
669 
670 	start = (__s32)fl->fl_start;
671 	if ((loff_t)start != fl->fl_start)
672 		goto out_einval;
673 
674 	if (fl->fl_end != OFFSET_MAX) {
675 		end = (__s32)fl->fl_end;
676 		if ((loff_t)end != fl->fl_end)
677 			goto out_einval;
678 	} else
679 		end = NFS_LOCK32_OFFSET_MAX;
680 
681 	if (start < 0 || start > end)
682 		goto out_einval;
683 	return 0;
684 out_einval:
685 	return -EINVAL;
686 }
687 
688 static int nfs_have_delegation(struct inode *inode, fmode_t flags)
689 {
690 	return 0;
691 }
692 
693 static const struct inode_operations nfs_dir_inode_operations = {
694 	.create		= nfs_create,
695 	.lookup		= nfs_lookup,
696 	.link		= nfs_link,
697 	.unlink		= nfs_unlink,
698 	.symlink	= nfs_symlink,
699 	.mkdir		= nfs_mkdir,
700 	.rmdir		= nfs_rmdir,
701 	.mknod		= nfs_mknod,
702 	.rename		= nfs_rename,
703 	.permission	= nfs_permission,
704 	.getattr	= nfs_getattr,
705 	.setattr	= nfs_setattr,
706 };
707 
708 static const struct inode_operations nfs_file_inode_operations = {
709 	.permission	= nfs_permission,
710 	.getattr	= nfs_getattr,
711 	.setattr	= nfs_setattr,
712 };
713 
714 const struct nfs_rpc_ops nfs_v2_clientops = {
715 	.version	= 2,		       /* protocol version */
716 	.dentry_ops	= &nfs_dentry_operations,
717 	.dir_inode_ops	= &nfs_dir_inode_operations,
718 	.file_inode_ops	= &nfs_file_inode_operations,
719 	.file_ops	= &nfs_file_operations,
720 	.getroot	= nfs_proc_get_root,
721 	.submount	= nfs_submount,
722 	.try_get_tree	= nfs_try_get_tree,
723 	.getattr	= nfs_proc_getattr,
724 	.setattr	= nfs_proc_setattr,
725 	.lookup		= nfs_proc_lookup,
726 	.access		= NULL,		       /* access */
727 	.readlink	= nfs_proc_readlink,
728 	.create		= nfs_proc_create,
729 	.remove		= nfs_proc_remove,
730 	.unlink_setup	= nfs_proc_unlink_setup,
731 	.unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
732 	.unlink_done	= nfs_proc_unlink_done,
733 	.rename_setup	= nfs_proc_rename_setup,
734 	.rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
735 	.rename_done	= nfs_proc_rename_done,
736 	.link		= nfs_proc_link,
737 	.symlink	= nfs_proc_symlink,
738 	.mkdir		= nfs_proc_mkdir,
739 	.rmdir		= nfs_proc_rmdir,
740 	.readdir	= nfs_proc_readdir,
741 	.mknod		= nfs_proc_mknod,
742 	.statfs		= nfs_proc_statfs,
743 	.fsinfo		= nfs_proc_fsinfo,
744 	.pathconf	= nfs_proc_pathconf,
745 	.decode_dirent	= nfs2_decode_dirent,
746 	.pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare,
747 	.read_setup	= nfs_proc_read_setup,
748 	.read_done	= nfs_read_done,
749 	.write_setup	= nfs_proc_write_setup,
750 	.write_done	= nfs_write_done,
751 	.commit_setup	= nfs_proc_commit_setup,
752 	.commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
753 	.lock		= nfs_proc_lock,
754 	.lock_check_bounds = nfs_lock_check_bounds,
755 	.close_context	= nfs_close_context,
756 	.have_delegation = nfs_have_delegation,
757 	.alloc_client	= nfs_alloc_client,
758 	.init_client	= nfs_init_client,
759 	.free_client	= nfs_free_client,
760 	.create_server	= nfs_create_server,
761 	.clone_server	= nfs_clone_server,
762 };
763