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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{
104 struct rpc_message msg = {
105 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
106 .rpc_argp = fhandle,
107 .rpc_resp = fattr,
108 };
109 int status;
110
111 dprintk("NFS call getattr\n");
112 nfs_fattr_init(fattr);
113 status = rpc_call_sync(server->client, &msg, 0);
114 dprintk("NFS reply getattr: %d\n", status);
115 return status;
116}
117
118static int
119nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
120 struct iattr *sattr)
121{
122 struct inode *inode = d_inode(dentry);
123 struct nfs_sattrargs arg = {
124 .fh = NFS_FH(inode),
125 .sattr = sattr
126 };
127 struct rpc_message msg = {
128 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
129 .rpc_argp = &arg,
130 .rpc_resp = fattr,
131 };
132 int status;
133
134 /* Mask out the non-modebit related stuff from attr->ia_mode */
135 sattr->ia_mode &= S_IALLUGO;
136
137 dprintk("NFS call setattr\n");
138 if (sattr->ia_valid & ATTR_FILE)
139 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
140 nfs_fattr_init(fattr);
141 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
142 if (status == 0)
143 nfs_setattr_update_inode(inode, sattr, fattr);
144 dprintk("NFS reply setattr: %d\n", status);
145 return status;
146}
147
148static int
149nfs_proc_lookup(struct inode *dir, const struct qstr *name,
150 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
151 struct nfs4_label *label)
152{
153 struct nfs_diropargs arg = {
154 .fh = NFS_FH(dir),
155 .name = name->name,
156 .len = name->len
157 };
158 struct nfs_diropok res = {
159 .fh = fhandle,
160 .fattr = fattr
161 };
162 struct rpc_message msg = {
163 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
164 .rpc_argp = &arg,
165 .rpc_resp = &res,
166 };
167 int status;
168
169 dprintk("NFS call lookup %s\n", name->name);
170 nfs_fattr_init(fattr);
171 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
172 dprintk("NFS reply lookup: %d\n", status);
173 return status;
174}
175
176static int nfs_proc_readlink(struct inode *inode, struct page *page,
177 unsigned int pgbase, unsigned int pglen)
178{
179 struct nfs_readlinkargs args = {
180 .fh = NFS_FH(inode),
181 .pgbase = pgbase,
182 .pglen = pglen,
183 .pages = &page
184 };
185 struct rpc_message msg = {
186 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
187 .rpc_argp = &args,
188 };
189 int status;
190
191 dprintk("NFS call readlink\n");
192 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
193 dprintk("NFS reply readlink: %d\n", status);
194 return status;
195}
196
197struct nfs_createdata {
198 struct nfs_createargs arg;
199 struct nfs_diropok res;
200 struct nfs_fh fhandle;
201 struct nfs_fattr fattr;
202};
203
204static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
205 struct dentry *dentry, struct iattr *sattr)
206{
207 struct nfs_createdata *data;
208
209 data = kmalloc(sizeof(*data), GFP_KERNEL);
210
211 if (data != NULL) {
212 data->arg.fh = NFS_FH(dir);
213 data->arg.name = dentry->d_name.name;
214 data->arg.len = dentry->d_name.len;
215 data->arg.sattr = sattr;
216 nfs_fattr_init(&data->fattr);
217 data->fhandle.size = 0;
218 data->res.fh = &data->fhandle;
219 data->res.fattr = &data->fattr;
220 }
221 return data;
222};
223
224static void nfs_free_createdata(const struct nfs_createdata *data)
225{
226 kfree(data);
227}
228
229static int
230nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
231 int flags)
232{
233 struct nfs_createdata *data;
234 struct rpc_message msg = {
235 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
236 };
237 int status = -ENOMEM;
238
239 dprintk("NFS call create %pd\n", dentry);
240 data = nfs_alloc_createdata(dir, dentry, sattr);
241 if (data == NULL)
242 goto out;
243 msg.rpc_argp = &data->arg;
244 msg.rpc_resp = &data->res;
245 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
246 nfs_mark_for_revalidate(dir);
247 if (status == 0)
248 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
249 nfs_free_createdata(data);
250out:
251 dprintk("NFS reply create: %d\n", status);
252 return status;
253}
254
255/*
256 * In NFSv2, mknod is grafted onto the create call.
257 */
258static int
259nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
260 dev_t rdev)
261{
262 struct nfs_createdata *data;
263 struct rpc_message msg = {
264 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
265 };
266 umode_t mode;
267 int status = -ENOMEM;
268
269 dprintk("NFS call mknod %pd\n", dentry);
270
271 mode = sattr->ia_mode;
272 if (S_ISFIFO(mode)) {
273 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
274 sattr->ia_valid &= ~ATTR_SIZE;
275 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
276 sattr->ia_valid |= ATTR_SIZE;
277 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
278 }
279
280 data = nfs_alloc_createdata(dir, dentry, sattr);
281 if (data == NULL)
282 goto out;
283 msg.rpc_argp = &data->arg;
284 msg.rpc_resp = &data->res;
285
286 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
287 nfs_mark_for_revalidate(dir);
288
289 if (status == -EINVAL && S_ISFIFO(mode)) {
290 sattr->ia_mode = mode;
291 nfs_fattr_init(data->res.fattr);
292 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
293 }
294 if (status == 0)
295 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
296 nfs_free_createdata(data);
297out:
298 dprintk("NFS reply mknod: %d\n", status);
299 return status;
300}
301
302static int
303nfs_proc_remove(struct inode *dir, struct dentry *dentry)
304{
305 struct nfs_removeargs arg = {
306 .fh = NFS_FH(dir),
307 .name = dentry->d_name,
308 };
309 struct rpc_message msg = {
310 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
311 .rpc_argp = &arg,
312 };
313 int status;
314
315 dprintk("NFS call remove %pd2\n",dentry);
316 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
317 nfs_mark_for_revalidate(dir);
318
319 dprintk("NFS reply remove: %d\n", status);
320 return status;
321}
322
323static void
324nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dentry)
325{
326 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
327}
328
329static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
330{
331 rpc_call_start(task);
332}
333
334static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
335{
336 nfs_mark_for_revalidate(dir);
337 return 1;
338}
339
340static void
341nfs_proc_rename_setup(struct rpc_message *msg,
342 struct dentry *old_dentry,
343 struct dentry *new_dentry)
344{
345 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
346}
347
348static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
349{
350 rpc_call_start(task);
351}
352
353static int
354nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
355 struct inode *new_dir)
356{
357 nfs_mark_for_revalidate(old_dir);
358 nfs_mark_for_revalidate(new_dir);
359 return 1;
360}
361
362static int
363nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
364{
365 struct nfs_linkargs arg = {
366 .fromfh = NFS_FH(inode),
367 .tofh = NFS_FH(dir),
368 .toname = name->name,
369 .tolen = name->len
370 };
371 struct rpc_message msg = {
372 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
373 .rpc_argp = &arg,
374 };
375 int status;
376
377 dprintk("NFS call link %s\n", name->name);
378 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
379 nfs_mark_for_revalidate(inode);
380 nfs_mark_for_revalidate(dir);
381 dprintk("NFS reply link: %d\n", status);
382 return status;
383}
384
385static int
386nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
387 unsigned int len, struct iattr *sattr)
388{
389 struct nfs_fh *fh;
390 struct nfs_fattr *fattr;
391 struct nfs_symlinkargs arg = {
392 .fromfh = NFS_FH(dir),
393 .fromname = dentry->d_name.name,
394 .fromlen = dentry->d_name.len,
395 .pages = &page,
396 .pathlen = len,
397 .sattr = sattr
398 };
399 struct rpc_message msg = {
400 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
401 .rpc_argp = &arg,
402 };
403 int status = -ENAMETOOLONG;
404
405 dprintk("NFS call symlink %pd\n", dentry);
406
407 if (len > NFS2_MAXPATHLEN)
408 goto out;
409
410 fh = nfs_alloc_fhandle();
411 fattr = nfs_alloc_fattr();
412 status = -ENOMEM;
413 if (fh == NULL || fattr == NULL)
414 goto out_free;
415
416 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
417 nfs_mark_for_revalidate(dir);
418
419 /*
420 * V2 SYMLINK requests don't return any attributes. Setting the
421 * filehandle size to zero indicates to nfs_instantiate that it
422 * should fill in the data with a LOOKUP call on the wire.
423 */
424 if (status == 0)
425 status = nfs_instantiate(dentry, fh, fattr, NULL);
426
427out_free:
428 nfs_free_fattr(fattr);
429 nfs_free_fhandle(fh);
430out:
431 dprintk("NFS reply symlink: %d\n", status);
432 return status;
433}
434
435static int
436nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
437{
438 struct nfs_createdata *data;
439 struct rpc_message msg = {
440 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
441 };
442 int status = -ENOMEM;
443
444 dprintk("NFS call mkdir %pd\n", dentry);
445 data = nfs_alloc_createdata(dir, dentry, sattr);
446 if (data == NULL)
447 goto out;
448 msg.rpc_argp = &data->arg;
449 msg.rpc_resp = &data->res;
450
451 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
452 nfs_mark_for_revalidate(dir);
453 if (status == 0)
454 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
455 nfs_free_createdata(data);
456out:
457 dprintk("NFS reply mkdir: %d\n", status);
458 return status;
459}
460
461static int
462nfs_proc_rmdir(struct inode *dir, const struct qstr *name)
463{
464 struct nfs_diropargs arg = {
465 .fh = NFS_FH(dir),
466 .name = name->name,
467 .len = name->len
468 };
469 struct rpc_message msg = {
470 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
471 .rpc_argp = &arg,
472 };
473 int status;
474
475 dprintk("NFS call rmdir %s\n", name->name);
476 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
477 nfs_mark_for_revalidate(dir);
478 dprintk("NFS reply rmdir: %d\n", status);
479 return status;
480}
481
482/*
483 * The READDIR implementation is somewhat hackish - we pass a temporary
484 * buffer to the encode function, which installs it in the receive
485 * the receive iovec. The decode function just parses the reply to make
486 * sure it is syntactically correct; the entries itself are decoded
487 * from nfs_readdir by calling the decode_entry function directly.
488 */
489static int
490nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
491 u64 cookie, struct page **pages, unsigned int count, bool plus)
492{
493 struct inode *dir = d_inode(dentry);
494 struct nfs_readdirargs arg = {
495 .fh = NFS_FH(dir),
496 .cookie = cookie,
497 .count = count,
498 .pages = pages,
499 };
500 struct rpc_message msg = {
501 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
502 .rpc_argp = &arg,
503 .rpc_cred = cred,
504 };
505 int status;
506
507 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
508 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
509
510 nfs_invalidate_atime(dir);
511
512 dprintk("NFS reply readdir: %d\n", status);
513 return status;
514}
515
516static int
517nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
518 struct nfs_fsstat *stat)
519{
520 struct nfs2_fsstat fsinfo;
521 struct rpc_message msg = {
522 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
523 .rpc_argp = fhandle,
524 .rpc_resp = &fsinfo,
525 };
526 int status;
527
528 dprintk("NFS call statfs\n");
529 nfs_fattr_init(stat->fattr);
530 status = rpc_call_sync(server->client, &msg, 0);
531 dprintk("NFS reply statfs: %d\n", status);
532 if (status)
533 goto out;
534 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
535 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
536 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
537 stat->tfiles = 0;
538 stat->ffiles = 0;
539 stat->afiles = 0;
540out:
541 return status;
542}
543
544static int
545nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
546 struct nfs_fsinfo *info)
547{
548 struct nfs2_fsstat fsinfo;
549 struct rpc_message msg = {
550 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
551 .rpc_argp = fhandle,
552 .rpc_resp = &fsinfo,
553 };
554 int status;
555
556 dprintk("NFS call fsinfo\n");
557 nfs_fattr_init(info->fattr);
558 status = rpc_call_sync(server->client, &msg, 0);
559 dprintk("NFS reply fsinfo: %d\n", status);
560 if (status)
561 goto out;
562 info->rtmax = NFS_MAXDATA;
563 info->rtpref = fsinfo.tsize;
564 info->rtmult = fsinfo.bsize;
565 info->wtmax = NFS_MAXDATA;
566 info->wtpref = fsinfo.tsize;
567 info->wtmult = fsinfo.bsize;
568 info->dtpref = fsinfo.tsize;
569 info->maxfilesize = 0x7FFFFFFF;
570 info->lease_time = 0;
571out:
572 return status;
573}
574
575static int
576nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
577 struct nfs_pathconf *info)
578{
579 info->max_link = 0;
580 info->max_namelen = NFS2_MAXNAMLEN;
581 return 0;
582}
583
584static int nfs_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
585{
586 struct inode *inode = hdr->inode;
587
588 nfs_invalidate_atime(inode);
589 if (task->tk_status >= 0) {
590 nfs_refresh_inode(inode, hdr->res.fattr);
591 /* Emulate the eof flag, which isn't normally needed in NFSv2
592 * as it is guaranteed to always return the file attributes
593 */
594 if (hdr->args.offset + hdr->res.count >= hdr->res.fattr->size)
595 hdr->res.eof = 1;
596 }
597 return 0;
598}
599
600static void nfs_proc_read_setup(struct nfs_pgio_header *hdr,
601 struct rpc_message *msg)
602{
603 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
604}
605
606static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task,
607 struct nfs_pgio_header *hdr)
608{
609 rpc_call_start(task);
610 return 0;
611}
612
613static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
614{
615 if (task->tk_status >= 0)
616 nfs_writeback_update_inode(hdr);
617 return 0;
618}
619
620static void nfs_proc_write_setup(struct nfs_pgio_header *hdr,
621 struct rpc_message *msg)
622{
623 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
624 hdr->args.stable = NFS_FILE_SYNC;
625 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
626}
627
628static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
629{
630 BUG();
631}
632
633static void
634nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
635{
636 BUG();
637}
638
639static int
640nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
641{
642 struct inode *inode = file_inode(filp);
643
644 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, NULL);
645}
646
647/* Helper functions for NFS lock bounds checking */
648#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
649static int nfs_lock_check_bounds(const struct file_lock *fl)
650{
651 __s32 start, end;
652
653 start = (__s32)fl->fl_start;
654 if ((loff_t)start != fl->fl_start)
655 goto out_einval;
656
657 if (fl->fl_end != OFFSET_MAX) {
658 end = (__s32)fl->fl_end;
659 if ((loff_t)end != fl->fl_end)
660 goto out_einval;
661 } else
662 end = NFS_LOCK32_OFFSET_MAX;
663
664 if (start < 0 || start > end)
665 goto out_einval;
666 return 0;
667out_einval:
668 return -EINVAL;
669}
670
671static int nfs_have_delegation(struct inode *inode, fmode_t flags)
672{
673 return 0;
674}
675
676static const struct inode_operations nfs_dir_inode_operations = {
677 .create = nfs_create,
678 .lookup = nfs_lookup,
679 .link = nfs_link,
680 .unlink = nfs_unlink,
681 .symlink = nfs_symlink,
682 .mkdir = nfs_mkdir,
683 .rmdir = nfs_rmdir,
684 .mknod = nfs_mknod,
685 .rename = nfs_rename,
686 .permission = nfs_permission,
687 .getattr = nfs_getattr,
688 .setattr = nfs_setattr,
689};
690
691static const struct inode_operations nfs_file_inode_operations = {
692 .permission = nfs_permission,
693 .getattr = nfs_getattr,
694 .setattr = nfs_setattr,
695};
696
697const struct nfs_rpc_ops nfs_v2_clientops = {
698 .version = 2, /* protocol version */
699 .dentry_ops = &nfs_dentry_operations,
700 .dir_inode_ops = &nfs_dir_inode_operations,
701 .file_inode_ops = &nfs_file_inode_operations,
702 .file_ops = &nfs_file_operations,
703 .getroot = nfs_proc_get_root,
704 .submount = nfs_submount,
705 .try_mount = nfs_try_mount,
706 .getattr = nfs_proc_getattr,
707 .setattr = nfs_proc_setattr,
708 .lookup = nfs_proc_lookup,
709 .access = NULL, /* access */
710 .readlink = nfs_proc_readlink,
711 .create = nfs_proc_create,
712 .remove = nfs_proc_remove,
713 .unlink_setup = nfs_proc_unlink_setup,
714 .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
715 .unlink_done = nfs_proc_unlink_done,
716 .rename_setup = nfs_proc_rename_setup,
717 .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
718 .rename_done = nfs_proc_rename_done,
719 .link = nfs_proc_link,
720 .symlink = nfs_proc_symlink,
721 .mkdir = nfs_proc_mkdir,
722 .rmdir = nfs_proc_rmdir,
723 .readdir = nfs_proc_readdir,
724 .mknod = nfs_proc_mknod,
725 .statfs = nfs_proc_statfs,
726 .fsinfo = nfs_proc_fsinfo,
727 .pathconf = nfs_proc_pathconf,
728 .decode_dirent = nfs2_decode_dirent,
729 .pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare,
730 .read_setup = nfs_proc_read_setup,
731 .read_done = nfs_read_done,
732 .write_setup = nfs_proc_write_setup,
733 .write_done = nfs_write_done,
734 .commit_setup = nfs_proc_commit_setup,
735 .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
736 .lock = nfs_proc_lock,
737 .lock_check_bounds = nfs_lock_check_bounds,
738 .close_context = nfs_close_context,
739 .have_delegation = nfs_have_delegation,
740 .alloc_client = nfs_alloc_client,
741 .init_client = nfs_init_client,
742 .free_client = nfs_free_client,
743 .create_server = nfs_create_server,
744 .clone_server = nfs_clone_server,
745};
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 info->change_attr_type = NFS4_CHANGE_TYPE_IS_TIME_METADATA;
95 return 0;
96}
97
98/*
99 * One function for each procedure in the NFS protocol.
100 */
101static int
102nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
103 struct nfs_fattr *fattr, struct nfs4_label *label,
104 struct inode *inode)
105{
106 struct rpc_message msg = {
107 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
108 .rpc_argp = fhandle,
109 .rpc_resp = fattr,
110 };
111 int status;
112 unsigned short task_flags = 0;
113
114 /* Is this is an attribute revalidation, subject to softreval? */
115 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
116 task_flags |= RPC_TASK_TIMEOUT;
117
118 dprintk("NFS call getattr\n");
119 nfs_fattr_init(fattr);
120 status = rpc_call_sync(server->client, &msg, task_flags);
121 dprintk("NFS reply getattr: %d\n", status);
122 return status;
123}
124
125static int
126nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
127 struct iattr *sattr)
128{
129 struct inode *inode = d_inode(dentry);
130 struct nfs_sattrargs arg = {
131 .fh = NFS_FH(inode),
132 .sattr = sattr
133 };
134 struct rpc_message msg = {
135 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
136 .rpc_argp = &arg,
137 .rpc_resp = fattr,
138 };
139 int status;
140
141 /* Mask out the non-modebit related stuff from attr->ia_mode */
142 sattr->ia_mode &= S_IALLUGO;
143
144 dprintk("NFS call setattr\n");
145 if (sattr->ia_valid & ATTR_FILE)
146 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
147 nfs_fattr_init(fattr);
148 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
149 if (status == 0)
150 nfs_setattr_update_inode(inode, sattr, fattr);
151 dprintk("NFS reply setattr: %d\n", status);
152 return status;
153}
154
155static int
156nfs_proc_lookup(struct inode *dir, struct dentry *dentry,
157 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
158 struct nfs4_label *label)
159{
160 struct nfs_diropargs arg = {
161 .fh = NFS_FH(dir),
162 .name = dentry->d_name.name,
163 .len = dentry->d_name.len
164 };
165 struct nfs_diropok res = {
166 .fh = fhandle,
167 .fattr = fattr
168 };
169 struct rpc_message msg = {
170 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
171 .rpc_argp = &arg,
172 .rpc_resp = &res,
173 };
174 int status;
175 unsigned short task_flags = 0;
176
177 /* Is this is an attribute revalidation, subject to softreval? */
178 if (nfs_lookup_is_soft_revalidate(dentry))
179 task_flags |= RPC_TASK_TIMEOUT;
180
181 dprintk("NFS call lookup %pd2\n", dentry);
182 nfs_fattr_init(fattr);
183 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
184 dprintk("NFS reply lookup: %d\n", status);
185 return status;
186}
187
188static int nfs_proc_readlink(struct inode *inode, struct page *page,
189 unsigned int pgbase, unsigned int pglen)
190{
191 struct nfs_readlinkargs args = {
192 .fh = NFS_FH(inode),
193 .pgbase = pgbase,
194 .pglen = pglen,
195 .pages = &page
196 };
197 struct rpc_message msg = {
198 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
199 .rpc_argp = &args,
200 };
201 int status;
202
203 dprintk("NFS call readlink\n");
204 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
205 dprintk("NFS reply readlink: %d\n", status);
206 return status;
207}
208
209struct nfs_createdata {
210 struct nfs_createargs arg;
211 struct nfs_diropok res;
212 struct nfs_fh fhandle;
213 struct nfs_fattr fattr;
214};
215
216static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
217 struct dentry *dentry, struct iattr *sattr)
218{
219 struct nfs_createdata *data;
220
221 data = kmalloc(sizeof(*data), GFP_KERNEL);
222
223 if (data != NULL) {
224 data->arg.fh = NFS_FH(dir);
225 data->arg.name = dentry->d_name.name;
226 data->arg.len = dentry->d_name.len;
227 data->arg.sattr = sattr;
228 nfs_fattr_init(&data->fattr);
229 data->fhandle.size = 0;
230 data->res.fh = &data->fhandle;
231 data->res.fattr = &data->fattr;
232 }
233 return data;
234};
235
236static void nfs_free_createdata(const struct nfs_createdata *data)
237{
238 kfree(data);
239}
240
241static int
242nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
243 int flags)
244{
245 struct nfs_createdata *data;
246 struct rpc_message msg = {
247 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
248 };
249 int status = -ENOMEM;
250
251 dprintk("NFS call create %pd\n", dentry);
252 data = nfs_alloc_createdata(dir, dentry, sattr);
253 if (data == NULL)
254 goto out;
255 msg.rpc_argp = &data->arg;
256 msg.rpc_resp = &data->res;
257 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
258 nfs_mark_for_revalidate(dir);
259 if (status == 0)
260 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
261 nfs_free_createdata(data);
262out:
263 dprintk("NFS reply create: %d\n", status);
264 return status;
265}
266
267/*
268 * In NFSv2, mknod is grafted onto the create call.
269 */
270static int
271nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
272 dev_t rdev)
273{
274 struct nfs_createdata *data;
275 struct rpc_message msg = {
276 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
277 };
278 umode_t mode;
279 int status = -ENOMEM;
280
281 dprintk("NFS call mknod %pd\n", dentry);
282
283 mode = sattr->ia_mode;
284 if (S_ISFIFO(mode)) {
285 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
286 sattr->ia_valid &= ~ATTR_SIZE;
287 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
288 sattr->ia_valid |= ATTR_SIZE;
289 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
290 }
291
292 data = nfs_alloc_createdata(dir, dentry, sattr);
293 if (data == NULL)
294 goto out;
295 msg.rpc_argp = &data->arg;
296 msg.rpc_resp = &data->res;
297
298 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
299 nfs_mark_for_revalidate(dir);
300
301 if (status == -EINVAL && S_ISFIFO(mode)) {
302 sattr->ia_mode = mode;
303 nfs_fattr_init(data->res.fattr);
304 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
305 }
306 if (status == 0)
307 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
308 nfs_free_createdata(data);
309out:
310 dprintk("NFS reply mknod: %d\n", status);
311 return status;
312}
313
314static int
315nfs_proc_remove(struct inode *dir, struct dentry *dentry)
316{
317 struct nfs_removeargs arg = {
318 .fh = NFS_FH(dir),
319 .name = dentry->d_name,
320 };
321 struct rpc_message msg = {
322 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
323 .rpc_argp = &arg,
324 };
325 int status;
326
327 dprintk("NFS call remove %pd2\n",dentry);
328 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
329 nfs_mark_for_revalidate(dir);
330
331 dprintk("NFS reply remove: %d\n", status);
332 return status;
333}
334
335static void
336nfs_proc_unlink_setup(struct rpc_message *msg,
337 struct dentry *dentry,
338 struct inode *inode)
339{
340 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
341}
342
343static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
344{
345 rpc_call_start(task);
346}
347
348static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
349{
350 nfs_mark_for_revalidate(dir);
351 return 1;
352}
353
354static void
355nfs_proc_rename_setup(struct rpc_message *msg,
356 struct dentry *old_dentry,
357 struct dentry *new_dentry)
358{
359 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
360}
361
362static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
363{
364 rpc_call_start(task);
365}
366
367static int
368nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
369 struct inode *new_dir)
370{
371 nfs_mark_for_revalidate(old_dir);
372 nfs_mark_for_revalidate(new_dir);
373 return 1;
374}
375
376static int
377nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
378{
379 struct nfs_linkargs arg = {
380 .fromfh = NFS_FH(inode),
381 .tofh = NFS_FH(dir),
382 .toname = name->name,
383 .tolen = name->len
384 };
385 struct rpc_message msg = {
386 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
387 .rpc_argp = &arg,
388 };
389 int status;
390
391 dprintk("NFS call link %s\n", name->name);
392 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
393 nfs_mark_for_revalidate(inode);
394 nfs_mark_for_revalidate(dir);
395 dprintk("NFS reply link: %d\n", status);
396 return status;
397}
398
399static int
400nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
401 unsigned int len, struct iattr *sattr)
402{
403 struct nfs_fh *fh;
404 struct nfs_fattr *fattr;
405 struct nfs_symlinkargs arg = {
406 .fromfh = NFS_FH(dir),
407 .fromname = dentry->d_name.name,
408 .fromlen = dentry->d_name.len,
409 .pages = &page,
410 .pathlen = len,
411 .sattr = sattr
412 };
413 struct rpc_message msg = {
414 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
415 .rpc_argp = &arg,
416 };
417 int status = -ENAMETOOLONG;
418
419 dprintk("NFS call symlink %pd\n", dentry);
420
421 if (len > NFS2_MAXPATHLEN)
422 goto out;
423
424 fh = nfs_alloc_fhandle();
425 fattr = nfs_alloc_fattr();
426 status = -ENOMEM;
427 if (fh == NULL || fattr == NULL)
428 goto out_free;
429
430 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
431 nfs_mark_for_revalidate(dir);
432
433 /*
434 * V2 SYMLINK requests don't return any attributes. Setting the
435 * filehandle size to zero indicates to nfs_instantiate that it
436 * should fill in the data with a LOOKUP call on the wire.
437 */
438 if (status == 0)
439 status = nfs_instantiate(dentry, fh, fattr, NULL);
440
441out_free:
442 nfs_free_fattr(fattr);
443 nfs_free_fhandle(fh);
444out:
445 dprintk("NFS reply symlink: %d\n", status);
446 return status;
447}
448
449static int
450nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
451{
452 struct nfs_createdata *data;
453 struct rpc_message msg = {
454 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
455 };
456 int status = -ENOMEM;
457
458 dprintk("NFS call mkdir %pd\n", dentry);
459 data = nfs_alloc_createdata(dir, dentry, sattr);
460 if (data == NULL)
461 goto out;
462 msg.rpc_argp = &data->arg;
463 msg.rpc_resp = &data->res;
464
465 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
466 nfs_mark_for_revalidate(dir);
467 if (status == 0)
468 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
469 nfs_free_createdata(data);
470out:
471 dprintk("NFS reply mkdir: %d\n", status);
472 return status;
473}
474
475static int
476nfs_proc_rmdir(struct inode *dir, const struct qstr *name)
477{
478 struct nfs_diropargs arg = {
479 .fh = NFS_FH(dir),
480 .name = name->name,
481 .len = name->len
482 };
483 struct rpc_message msg = {
484 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
485 .rpc_argp = &arg,
486 };
487 int status;
488
489 dprintk("NFS call rmdir %s\n", name->name);
490 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
491 nfs_mark_for_revalidate(dir);
492 dprintk("NFS reply rmdir: %d\n", status);
493 return status;
494}
495
496/*
497 * The READDIR implementation is somewhat hackish - we pass a temporary
498 * buffer to the encode function, which installs it in the receive
499 * the receive iovec. The decode function just parses the reply to make
500 * sure it is syntactically correct; the entries itself are decoded
501 * from nfs_readdir by calling the decode_entry function directly.
502 */
503static int nfs_proc_readdir(struct nfs_readdir_arg *nr_arg,
504 struct nfs_readdir_res *nr_res)
505{
506 struct inode *dir = d_inode(nr_arg->dentry);
507 struct nfs_readdirargs arg = {
508 .fh = NFS_FH(dir),
509 .cookie = nr_arg->cookie,
510 .count = nr_arg->page_len,
511 .pages = nr_arg->pages,
512 };
513 struct rpc_message msg = {
514 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
515 .rpc_argp = &arg,
516 .rpc_cred = nr_arg->cred,
517 };
518 int status;
519
520 dprintk("NFS call readdir %llu\n", (unsigned long long)nr_arg->cookie);
521 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
522 nr_res->verf[0] = nr_res->verf[1] = 0;
523
524 nfs_invalidate_atime(dir);
525
526 dprintk("NFS reply readdir: %d\n", status);
527 return status;
528}
529
530static int
531nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
532 struct nfs_fsstat *stat)
533{
534 struct nfs2_fsstat fsinfo;
535 struct rpc_message msg = {
536 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
537 .rpc_argp = fhandle,
538 .rpc_resp = &fsinfo,
539 };
540 int status;
541
542 dprintk("NFS call statfs\n");
543 nfs_fattr_init(stat->fattr);
544 status = rpc_call_sync(server->client, &msg, 0);
545 dprintk("NFS reply statfs: %d\n", status);
546 if (status)
547 goto out;
548 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
549 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
550 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
551 stat->tfiles = 0;
552 stat->ffiles = 0;
553 stat->afiles = 0;
554out:
555 return status;
556}
557
558static int
559nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
560 struct nfs_fsinfo *info)
561{
562 struct nfs2_fsstat fsinfo;
563 struct rpc_message msg = {
564 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
565 .rpc_argp = fhandle,
566 .rpc_resp = &fsinfo,
567 };
568 int status;
569
570 dprintk("NFS call fsinfo\n");
571 nfs_fattr_init(info->fattr);
572 status = rpc_call_sync(server->client, &msg, 0);
573 dprintk("NFS reply fsinfo: %d\n", status);
574 if (status)
575 goto out;
576 info->rtmax = NFS_MAXDATA;
577 info->rtpref = fsinfo.tsize;
578 info->rtmult = fsinfo.bsize;
579 info->wtmax = NFS_MAXDATA;
580 info->wtpref = fsinfo.tsize;
581 info->wtmult = fsinfo.bsize;
582 info->dtpref = fsinfo.tsize;
583 info->maxfilesize = 0x7FFFFFFF;
584 info->lease_time = 0;
585out:
586 return status;
587}
588
589static int
590nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
591 struct nfs_pathconf *info)
592{
593 info->max_link = 0;
594 info->max_namelen = NFS2_MAXNAMLEN;
595 return 0;
596}
597
598static int nfs_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
599{
600 struct inode *inode = hdr->inode;
601
602 nfs_invalidate_atime(inode);
603 if (task->tk_status >= 0) {
604 nfs_refresh_inode(inode, hdr->res.fattr);
605 /* Emulate the eof flag, which isn't normally needed in NFSv2
606 * as it is guaranteed to always return the file attributes
607 */
608 if ((hdr->res.count == 0 && hdr->args.count > 0) ||
609 hdr->args.offset + hdr->res.count >= hdr->res.fattr->size)
610 hdr->res.eof = 1;
611 }
612 return 0;
613}
614
615static void nfs_proc_read_setup(struct nfs_pgio_header *hdr,
616 struct rpc_message *msg)
617{
618 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
619}
620
621static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task,
622 struct nfs_pgio_header *hdr)
623{
624 rpc_call_start(task);
625 return 0;
626}
627
628static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
629{
630 if (task->tk_status >= 0) {
631 hdr->res.count = hdr->args.count;
632 nfs_writeback_update_inode(hdr);
633 }
634 return 0;
635}
636
637static void nfs_proc_write_setup(struct nfs_pgio_header *hdr,
638 struct rpc_message *msg,
639 struct rpc_clnt **clnt)
640{
641 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
642 hdr->args.stable = NFS_FILE_SYNC;
643 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
644}
645
646static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
647{
648 BUG();
649}
650
651static void
652nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
653 struct rpc_clnt **clnt)
654{
655 BUG();
656}
657
658static int
659nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
660{
661 struct inode *inode = file_inode(filp);
662
663 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, NULL);
664}
665
666/* Helper functions for NFS lock bounds checking */
667#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
668static int nfs_lock_check_bounds(const struct file_lock *fl)
669{
670 __s32 start, end;
671
672 start = (__s32)fl->fl_start;
673 if ((loff_t)start != fl->fl_start)
674 goto out_einval;
675
676 if (fl->fl_end != OFFSET_MAX) {
677 end = (__s32)fl->fl_end;
678 if ((loff_t)end != fl->fl_end)
679 goto out_einval;
680 } else
681 end = NFS_LOCK32_OFFSET_MAX;
682
683 if (start < 0 || start > end)
684 goto out_einval;
685 return 0;
686out_einval:
687 return -EINVAL;
688}
689
690static int nfs_have_delegation(struct inode *inode, fmode_t flags)
691{
692 return 0;
693}
694
695static const struct inode_operations nfs_dir_inode_operations = {
696 .create = nfs_create,
697 .lookup = nfs_lookup,
698 .link = nfs_link,
699 .unlink = nfs_unlink,
700 .symlink = nfs_symlink,
701 .mkdir = nfs_mkdir,
702 .rmdir = nfs_rmdir,
703 .mknod = nfs_mknod,
704 .rename = nfs_rename,
705 .permission = nfs_permission,
706 .getattr = nfs_getattr,
707 .setattr = nfs_setattr,
708};
709
710static const struct inode_operations nfs_file_inode_operations = {
711 .permission = nfs_permission,
712 .getattr = nfs_getattr,
713 .setattr = nfs_setattr,
714};
715
716const struct nfs_rpc_ops nfs_v2_clientops = {
717 .version = 2, /* protocol version */
718 .dentry_ops = &nfs_dentry_operations,
719 .dir_inode_ops = &nfs_dir_inode_operations,
720 .file_inode_ops = &nfs_file_inode_operations,
721 .file_ops = &nfs_file_operations,
722 .getroot = nfs_proc_get_root,
723 .submount = nfs_submount,
724 .try_get_tree = nfs_try_get_tree,
725 .getattr = nfs_proc_getattr,
726 .setattr = nfs_proc_setattr,
727 .lookup = nfs_proc_lookup,
728 .access = NULL, /* access */
729 .readlink = nfs_proc_readlink,
730 .create = nfs_proc_create,
731 .remove = nfs_proc_remove,
732 .unlink_setup = nfs_proc_unlink_setup,
733 .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
734 .unlink_done = nfs_proc_unlink_done,
735 .rename_setup = nfs_proc_rename_setup,
736 .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
737 .rename_done = nfs_proc_rename_done,
738 .link = nfs_proc_link,
739 .symlink = nfs_proc_symlink,
740 .mkdir = nfs_proc_mkdir,
741 .rmdir = nfs_proc_rmdir,
742 .readdir = nfs_proc_readdir,
743 .mknod = nfs_proc_mknod,
744 .statfs = nfs_proc_statfs,
745 .fsinfo = nfs_proc_fsinfo,
746 .pathconf = nfs_proc_pathconf,
747 .decode_dirent = nfs2_decode_dirent,
748 .pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare,
749 .read_setup = nfs_proc_read_setup,
750 .read_done = nfs_read_done,
751 .write_setup = nfs_proc_write_setup,
752 .write_done = nfs_write_done,
753 .commit_setup = nfs_proc_commit_setup,
754 .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
755 .lock = nfs_proc_lock,
756 .lock_check_bounds = nfs_lock_check_bounds,
757 .close_context = nfs_close_context,
758 .have_delegation = nfs_have_delegation,
759 .alloc_client = nfs_alloc_client,
760 .init_client = nfs_init_client,
761 .free_client = nfs_free_client,
762 .create_server = nfs_create_server,
763 .clone_server = nfs_clone_server,
764};