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