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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/*
2 * linux/fs/nfs/proc.c
3 *
4 * Copyright (C) 1992, 1993, 1994 Rick Sladkey
5 *
6 * OS-independent nfs remote procedure call functions
7 *
8 * Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
9 * so at last we can have decent(ish) throughput off a
10 * Sun server.
11 *
12 * Coding optimized and cleaned up by Florian La Roche.
13 * Note: Error returns are optimized for NFS_OK, which isn't translated via
14 * nfs_stat_to_errno(), but happens to be already the right return code.
15 *
16 * Also, the code currently doesn't check the size of the packet, when
17 * it decodes the packet.
18 *
19 * Feel free to fix it and mail me the diffs if it worries you.
20 *
21 * Completely rewritten to support the new RPC call interface;
22 * rewrote and moved the entire XDR stuff to xdr.c
23 * --Olaf Kirch June 1996
24 *
25 * The code below initializes all auto variables explicitly, otherwise
26 * it will fail to work as a module (gcc generates a memset call for an
27 * incomplete struct).
28 */
29
30#include <linux/types.h>
31#include <linux/param.h>
32#include <linux/time.h>
33#include <linux/mm.h>
34#include <linux/errno.h>
35#include <linux/string.h>
36#include <linux/in.h>
37#include <linux/pagemap.h>
38#include <linux/sunrpc/clnt.h>
39#include <linux/nfs.h>
40#include <linux/nfs2.h>
41#include <linux/nfs_fs.h>
42#include <linux/nfs_page.h>
43#include <linux/lockd/bind.h>
44#include "internal.h"
45
46#define NFSDBG_FACILITY NFSDBG_PROC
47
48/*
49 * wrapper to handle the -EKEYEXPIRED error message. This should generally
50 * only happen if using krb5 auth and a user's TGT expires. NFSv2 doesn't
51 * support the NFSERR_JUKEBOX error code, but we handle this situation in the
52 * same way that we handle that error with NFSv3.
53 */
54static int
55nfs_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
56{
57 int res;
58 do {
59 res = rpc_call_sync(clnt, msg, flags);
60 if (res != -EKEYEXPIRED)
61 break;
62 schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
63 res = -ERESTARTSYS;
64 } while (!fatal_signal_pending(current));
65 return res;
66}
67
68#define rpc_call_sync(clnt, msg, flags) nfs_rpc_wrapper(clnt, msg, flags)
69
70static int
71nfs_async_handle_expired_key(struct rpc_task *task)
72{
73 if (task->tk_status != -EKEYEXPIRED)
74 return 0;
75 task->tk_status = 0;
76 rpc_restart_call(task);
77 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
78 return 1;
79}
80
81/*
82 * Bare-bones access to getattr: this is for nfs_read_super.
83 */
84static int
85nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
86 struct nfs_fsinfo *info)
87{
88 struct nfs_fattr *fattr = info->fattr;
89 struct nfs2_fsstat fsinfo;
90 struct rpc_message msg = {
91 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
92 .rpc_argp = fhandle,
93 .rpc_resp = fattr,
94 };
95 int status;
96
97 dprintk("%s: call getattr\n", __func__);
98 nfs_fattr_init(fattr);
99 status = rpc_call_sync(server->client, &msg, 0);
100 /* Retry with default authentication if different */
101 if (status && server->nfs_client->cl_rpcclient != server->client)
102 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
103 dprintk("%s: reply getattr: %d\n", __func__, status);
104 if (status)
105 return status;
106 dprintk("%s: call statfs\n", __func__);
107 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
108 msg.rpc_resp = &fsinfo;
109 status = rpc_call_sync(server->client, &msg, 0);
110 /* Retry with default authentication if different */
111 if (status && server->nfs_client->cl_rpcclient != server->client)
112 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
113 dprintk("%s: reply statfs: %d\n", __func__, status);
114 if (status)
115 return status;
116 info->rtmax = NFS_MAXDATA;
117 info->rtpref = fsinfo.tsize;
118 info->rtmult = fsinfo.bsize;
119 info->wtmax = NFS_MAXDATA;
120 info->wtpref = fsinfo.tsize;
121 info->wtmult = fsinfo.bsize;
122 info->dtpref = fsinfo.tsize;
123 info->maxfilesize = 0x7FFFFFFF;
124 info->lease_time = 0;
125 return 0;
126}
127
128/*
129 * One function for each procedure in the NFS protocol.
130 */
131static int
132nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
133 struct nfs_fattr *fattr)
134{
135 struct rpc_message msg = {
136 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
137 .rpc_argp = fhandle,
138 .rpc_resp = fattr,
139 };
140 int status;
141
142 dprintk("NFS call getattr\n");
143 nfs_fattr_init(fattr);
144 status = rpc_call_sync(server->client, &msg, 0);
145 dprintk("NFS reply getattr: %d\n", status);
146 return status;
147}
148
149static int
150nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
151 struct iattr *sattr)
152{
153 struct inode *inode = dentry->d_inode;
154 struct nfs_sattrargs arg = {
155 .fh = NFS_FH(inode),
156 .sattr = sattr
157 };
158 struct rpc_message msg = {
159 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
160 .rpc_argp = &arg,
161 .rpc_resp = fattr,
162 };
163 int status;
164
165 /* Mask out the non-modebit related stuff from attr->ia_mode */
166 sattr->ia_mode &= S_IALLUGO;
167
168 dprintk("NFS call setattr\n");
169 if (sattr->ia_valid & ATTR_FILE)
170 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
171 nfs_fattr_init(fattr);
172 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
173 if (status == 0)
174 nfs_setattr_update_inode(inode, sattr);
175 dprintk("NFS reply setattr: %d\n", status);
176 return status;
177}
178
179static int
180nfs_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
181 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
182{
183 struct nfs_diropargs arg = {
184 .fh = NFS_FH(dir),
185 .name = name->name,
186 .len = name->len
187 };
188 struct nfs_diropok res = {
189 .fh = fhandle,
190 .fattr = fattr
191 };
192 struct rpc_message msg = {
193 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
194 .rpc_argp = &arg,
195 .rpc_resp = &res,
196 };
197 int status;
198
199 dprintk("NFS call lookup %s\n", name->name);
200 nfs_fattr_init(fattr);
201 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
202 dprintk("NFS reply lookup: %d\n", status);
203 return status;
204}
205
206static int nfs_proc_readlink(struct inode *inode, struct page *page,
207 unsigned int pgbase, unsigned int pglen)
208{
209 struct nfs_readlinkargs args = {
210 .fh = NFS_FH(inode),
211 .pgbase = pgbase,
212 .pglen = pglen,
213 .pages = &page
214 };
215 struct rpc_message msg = {
216 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
217 .rpc_argp = &args,
218 };
219 int status;
220
221 dprintk("NFS call readlink\n");
222 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
223 dprintk("NFS reply readlink: %d\n", status);
224 return status;
225}
226
227struct nfs_createdata {
228 struct nfs_createargs arg;
229 struct nfs_diropok res;
230 struct nfs_fh fhandle;
231 struct nfs_fattr fattr;
232};
233
234static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
235 struct dentry *dentry, struct iattr *sattr)
236{
237 struct nfs_createdata *data;
238
239 data = kmalloc(sizeof(*data), GFP_KERNEL);
240
241 if (data != NULL) {
242 data->arg.fh = NFS_FH(dir);
243 data->arg.name = dentry->d_name.name;
244 data->arg.len = dentry->d_name.len;
245 data->arg.sattr = sattr;
246 nfs_fattr_init(&data->fattr);
247 data->fhandle.size = 0;
248 data->res.fh = &data->fhandle;
249 data->res.fattr = &data->fattr;
250 }
251 return data;
252};
253
254static void nfs_free_createdata(const struct nfs_createdata *data)
255{
256 kfree(data);
257}
258
259static int
260nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
261 int flags, struct nfs_open_context *ctx)
262{
263 struct nfs_createdata *data;
264 struct rpc_message msg = {
265 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
266 };
267 int status = -ENOMEM;
268
269 dprintk("NFS call create %s\n", dentry->d_name.name);
270 data = nfs_alloc_createdata(dir, dentry, sattr);
271 if (data == NULL)
272 goto out;
273 msg.rpc_argp = &data->arg;
274 msg.rpc_resp = &data->res;
275 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
276 nfs_mark_for_revalidate(dir);
277 if (status == 0)
278 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
279 nfs_free_createdata(data);
280out:
281 dprintk("NFS reply create: %d\n", status);
282 return status;
283}
284
285/*
286 * In NFSv2, mknod is grafted onto the create call.
287 */
288static int
289nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
290 dev_t rdev)
291{
292 struct nfs_createdata *data;
293 struct rpc_message msg = {
294 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
295 };
296 umode_t mode;
297 int status = -ENOMEM;
298
299 dprintk("NFS call mknod %s\n", dentry->d_name.name);
300
301 mode = sattr->ia_mode;
302 if (S_ISFIFO(mode)) {
303 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
304 sattr->ia_valid &= ~ATTR_SIZE;
305 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
306 sattr->ia_valid |= ATTR_SIZE;
307 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
308 }
309
310 data = nfs_alloc_createdata(dir, dentry, sattr);
311 if (data == NULL)
312 goto out;
313 msg.rpc_argp = &data->arg;
314 msg.rpc_resp = &data->res;
315
316 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
317 nfs_mark_for_revalidate(dir);
318
319 if (status == -EINVAL && S_ISFIFO(mode)) {
320 sattr->ia_mode = mode;
321 nfs_fattr_init(data->res.fattr);
322 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
323 }
324 if (status == 0)
325 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
326 nfs_free_createdata(data);
327out:
328 dprintk("NFS reply mknod: %d\n", status);
329 return status;
330}
331
332static int
333nfs_proc_remove(struct inode *dir, struct qstr *name)
334{
335 struct nfs_removeargs arg = {
336 .fh = NFS_FH(dir),
337 .name.len = name->len,
338 .name.name = name->name,
339 };
340 struct rpc_message msg = {
341 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
342 .rpc_argp = &arg,
343 };
344 int status;
345
346 dprintk("NFS call remove %s\n", name->name);
347 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
348 nfs_mark_for_revalidate(dir);
349
350 dprintk("NFS reply remove: %d\n", status);
351 return status;
352}
353
354static void
355nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
356{
357 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
358}
359
360static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
361{
362 if (nfs_async_handle_expired_key(task))
363 return 0;
364 nfs_mark_for_revalidate(dir);
365 return 1;
366}
367
368static void
369nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
370{
371 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
372}
373
374static int
375nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
376 struct inode *new_dir)
377{
378 if (nfs_async_handle_expired_key(task))
379 return 0;
380 nfs_mark_for_revalidate(old_dir);
381 nfs_mark_for_revalidate(new_dir);
382 return 1;
383}
384
385static int
386nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
387 struct inode *new_dir, struct qstr *new_name)
388{
389 struct nfs_renameargs arg = {
390 .old_dir = NFS_FH(old_dir),
391 .old_name = old_name,
392 .new_dir = NFS_FH(new_dir),
393 .new_name = new_name,
394 };
395 struct rpc_message msg = {
396 .rpc_proc = &nfs_procedures[NFSPROC_RENAME],
397 .rpc_argp = &arg,
398 };
399 int status;
400
401 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
402 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
403 nfs_mark_for_revalidate(old_dir);
404 nfs_mark_for_revalidate(new_dir);
405 dprintk("NFS reply rename: %d\n", status);
406 return status;
407}
408
409static int
410nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
411{
412 struct nfs_linkargs arg = {
413 .fromfh = NFS_FH(inode),
414 .tofh = NFS_FH(dir),
415 .toname = name->name,
416 .tolen = name->len
417 };
418 struct rpc_message msg = {
419 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
420 .rpc_argp = &arg,
421 };
422 int status;
423
424 dprintk("NFS call link %s\n", name->name);
425 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
426 nfs_mark_for_revalidate(inode);
427 nfs_mark_for_revalidate(dir);
428 dprintk("NFS reply link: %d\n", status);
429 return status;
430}
431
432static int
433nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
434 unsigned int len, struct iattr *sattr)
435{
436 struct nfs_fh *fh;
437 struct nfs_fattr *fattr;
438 struct nfs_symlinkargs arg = {
439 .fromfh = NFS_FH(dir),
440 .fromname = dentry->d_name.name,
441 .fromlen = dentry->d_name.len,
442 .pages = &page,
443 .pathlen = len,
444 .sattr = sattr
445 };
446 struct rpc_message msg = {
447 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
448 .rpc_argp = &arg,
449 };
450 int status = -ENAMETOOLONG;
451
452 dprintk("NFS call symlink %s\n", dentry->d_name.name);
453
454 if (len > NFS2_MAXPATHLEN)
455 goto out;
456
457 fh = nfs_alloc_fhandle();
458 fattr = nfs_alloc_fattr();
459 status = -ENOMEM;
460 if (fh == NULL || fattr == NULL)
461 goto out_free;
462
463 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
464 nfs_mark_for_revalidate(dir);
465
466 /*
467 * V2 SYMLINK requests don't return any attributes. Setting the
468 * filehandle size to zero indicates to nfs_instantiate that it
469 * should fill in the data with a LOOKUP call on the wire.
470 */
471 if (status == 0)
472 status = nfs_instantiate(dentry, fh, fattr);
473
474out_free:
475 nfs_free_fattr(fattr);
476 nfs_free_fhandle(fh);
477out:
478 dprintk("NFS reply symlink: %d\n", status);
479 return status;
480}
481
482static int
483nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
484{
485 struct nfs_createdata *data;
486 struct rpc_message msg = {
487 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
488 };
489 int status = -ENOMEM;
490
491 dprintk("NFS call mkdir %s\n", dentry->d_name.name);
492 data = nfs_alloc_createdata(dir, dentry, sattr);
493 if (data == NULL)
494 goto out;
495 msg.rpc_argp = &data->arg;
496 msg.rpc_resp = &data->res;
497
498 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
499 nfs_mark_for_revalidate(dir);
500 if (status == 0)
501 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
502 nfs_free_createdata(data);
503out:
504 dprintk("NFS reply mkdir: %d\n", status);
505 return status;
506}
507
508static int
509nfs_proc_rmdir(struct inode *dir, struct qstr *name)
510{
511 struct nfs_diropargs arg = {
512 .fh = NFS_FH(dir),
513 .name = name->name,
514 .len = name->len
515 };
516 struct rpc_message msg = {
517 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
518 .rpc_argp = &arg,
519 };
520 int status;
521
522 dprintk("NFS call rmdir %s\n", name->name);
523 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
524 nfs_mark_for_revalidate(dir);
525 dprintk("NFS reply rmdir: %d\n", status);
526 return status;
527}
528
529/*
530 * The READDIR implementation is somewhat hackish - we pass a temporary
531 * buffer to the encode function, which installs it in the receive
532 * the receive iovec. The decode function just parses the reply to make
533 * sure it is syntactically correct; the entries itself are decoded
534 * from nfs_readdir by calling the decode_entry function directly.
535 */
536static int
537nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
538 u64 cookie, struct page **pages, unsigned int count, int plus)
539{
540 struct inode *dir = dentry->d_inode;
541 struct nfs_readdirargs arg = {
542 .fh = NFS_FH(dir),
543 .cookie = cookie,
544 .count = count,
545 .pages = pages,
546 };
547 struct rpc_message msg = {
548 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
549 .rpc_argp = &arg,
550 .rpc_cred = cred,
551 };
552 int status;
553
554 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
555 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
556
557 nfs_invalidate_atime(dir);
558
559 dprintk("NFS reply readdir: %d\n", status);
560 return status;
561}
562
563static int
564nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
565 struct nfs_fsstat *stat)
566{
567 struct nfs2_fsstat fsinfo;
568 struct rpc_message msg = {
569 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
570 .rpc_argp = fhandle,
571 .rpc_resp = &fsinfo,
572 };
573 int status;
574
575 dprintk("NFS call statfs\n");
576 nfs_fattr_init(stat->fattr);
577 status = rpc_call_sync(server->client, &msg, 0);
578 dprintk("NFS reply statfs: %d\n", status);
579 if (status)
580 goto out;
581 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
582 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
583 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
584 stat->tfiles = 0;
585 stat->ffiles = 0;
586 stat->afiles = 0;
587out:
588 return status;
589}
590
591static int
592nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
593 struct nfs_fsinfo *info)
594{
595 struct nfs2_fsstat fsinfo;
596 struct rpc_message msg = {
597 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
598 .rpc_argp = fhandle,
599 .rpc_resp = &fsinfo,
600 };
601 int status;
602
603 dprintk("NFS call fsinfo\n");
604 nfs_fattr_init(info->fattr);
605 status = rpc_call_sync(server->client, &msg, 0);
606 dprintk("NFS reply fsinfo: %d\n", status);
607 if (status)
608 goto out;
609 info->rtmax = NFS_MAXDATA;
610 info->rtpref = fsinfo.tsize;
611 info->rtmult = fsinfo.bsize;
612 info->wtmax = NFS_MAXDATA;
613 info->wtpref = fsinfo.tsize;
614 info->wtmult = fsinfo.bsize;
615 info->dtpref = fsinfo.tsize;
616 info->maxfilesize = 0x7FFFFFFF;
617 info->lease_time = 0;
618out:
619 return status;
620}
621
622static int
623nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
624 struct nfs_pathconf *info)
625{
626 info->max_link = 0;
627 info->max_namelen = NFS2_MAXNAMLEN;
628 return 0;
629}
630
631static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
632{
633 if (nfs_async_handle_expired_key(task))
634 return -EAGAIN;
635
636 nfs_invalidate_atime(data->inode);
637 if (task->tk_status >= 0) {
638 nfs_refresh_inode(data->inode, data->res.fattr);
639 /* Emulate the eof flag, which isn't normally needed in NFSv2
640 * as it is guaranteed to always return the file attributes
641 */
642 if (data->args.offset + data->args.count >= data->res.fattr->size)
643 data->res.eof = 1;
644 }
645 return 0;
646}
647
648static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
649{
650 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
651}
652
653static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
654{
655 if (nfs_async_handle_expired_key(task))
656 return -EAGAIN;
657
658 if (task->tk_status >= 0)
659 nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
660 return 0;
661}
662
663static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
664{
665 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
666 data->args.stable = NFS_FILE_SYNC;
667 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
668}
669
670static void
671nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
672{
673 BUG();
674}
675
676static int
677nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
678{
679 struct inode *inode = filp->f_path.dentry->d_inode;
680
681 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
682}
683
684/* Helper functions for NFS lock bounds checking */
685#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
686static int nfs_lock_check_bounds(const struct file_lock *fl)
687{
688 __s32 start, end;
689
690 start = (__s32)fl->fl_start;
691 if ((loff_t)start != fl->fl_start)
692 goto out_einval;
693
694 if (fl->fl_end != OFFSET_MAX) {
695 end = (__s32)fl->fl_end;
696 if ((loff_t)end != fl->fl_end)
697 goto out_einval;
698 } else
699 end = NFS_LOCK32_OFFSET_MAX;
700
701 if (start < 0 || start > end)
702 goto out_einval;
703 return 0;
704out_einval:
705 return -EINVAL;
706}
707
708const struct nfs_rpc_ops nfs_v2_clientops = {
709 .version = 2, /* protocol version */
710 .dentry_ops = &nfs_dentry_operations,
711 .dir_inode_ops = &nfs_dir_inode_operations,
712 .file_inode_ops = &nfs_file_inode_operations,
713 .getroot = nfs_proc_get_root,
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_done = nfs_proc_unlink_done,
723 .rename = nfs_proc_rename,
724 .rename_setup = nfs_proc_rename_setup,
725 .rename_done = nfs_proc_rename_done,
726 .link = nfs_proc_link,
727 .symlink = nfs_proc_symlink,
728 .mkdir = nfs_proc_mkdir,
729 .rmdir = nfs_proc_rmdir,
730 .readdir = nfs_proc_readdir,
731 .mknod = nfs_proc_mknod,
732 .statfs = nfs_proc_statfs,
733 .fsinfo = nfs_proc_fsinfo,
734 .pathconf = nfs_proc_pathconf,
735 .decode_dirent = nfs2_decode_dirent,
736 .read_setup = nfs_proc_read_setup,
737 .read_done = nfs_read_done,
738 .write_setup = nfs_proc_write_setup,
739 .write_done = nfs_write_done,
740 .commit_setup = nfs_proc_commit_setup,
741 .lock = nfs_proc_lock,
742 .lock_check_bounds = nfs_lock_check_bounds,
743 .close_context = nfs_close_context,
744 .init_client = nfs_init_client,
745};