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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};
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 <linux/freezer.h>
45#include "internal.h"
46
47#define NFSDBG_FACILITY NFSDBG_PROC
48
49/*
50 * wrapper to handle the -EKEYEXPIRED error message. This should generally
51 * only happen if using krb5 auth and a user's TGT expires. NFSv2 doesn't
52 * support the NFSERR_JUKEBOX error code, but we handle this situation in the
53 * same way that we handle that error with NFSv3.
54 */
55static int
56nfs_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
57{
58 int res;
59 do {
60 res = rpc_call_sync(clnt, msg, flags);
61 if (res != -EKEYEXPIRED)
62 break;
63 freezable_schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
64 res = -ERESTARTSYS;
65 } while (!fatal_signal_pending(current));
66 return res;
67}
68
69#define rpc_call_sync(clnt, msg, flags) nfs_rpc_wrapper(clnt, msg, flags)
70
71static int
72nfs_async_handle_expired_key(struct rpc_task *task)
73{
74 if (task->tk_status != -EKEYEXPIRED)
75 return 0;
76 task->tk_status = 0;
77 rpc_restart_call(task);
78 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
79 return 1;
80}
81
82/*
83 * Bare-bones access to getattr: this is for nfs_read_super.
84 */
85static int
86nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
87 struct nfs_fsinfo *info)
88{
89 struct nfs_fattr *fattr = info->fattr;
90 struct nfs2_fsstat fsinfo;
91 struct rpc_message msg = {
92 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
93 .rpc_argp = fhandle,
94 .rpc_resp = fattr,
95 };
96 int status;
97
98 dprintk("%s: call getattr\n", __func__);
99 nfs_fattr_init(fattr);
100 status = rpc_call_sync(server->client, &msg, 0);
101 /* Retry with default authentication if different */
102 if (status && server->nfs_client->cl_rpcclient != server->client)
103 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
104 dprintk("%s: reply getattr: %d\n", __func__, status);
105 if (status)
106 return status;
107 dprintk("%s: call statfs\n", __func__);
108 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
109 msg.rpc_resp = &fsinfo;
110 status = rpc_call_sync(server->client, &msg, 0);
111 /* Retry with default authentication if different */
112 if (status && server->nfs_client->cl_rpcclient != server->client)
113 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
114 dprintk("%s: reply statfs: %d\n", __func__, status);
115 if (status)
116 return status;
117 info->rtmax = NFS_MAXDATA;
118 info->rtpref = fsinfo.tsize;
119 info->rtmult = fsinfo.bsize;
120 info->wtmax = NFS_MAXDATA;
121 info->wtpref = fsinfo.tsize;
122 info->wtmult = fsinfo.bsize;
123 info->dtpref = fsinfo.tsize;
124 info->maxfilesize = 0x7FFFFFFF;
125 info->lease_time = 0;
126 return 0;
127}
128
129/*
130 * One function for each procedure in the NFS protocol.
131 */
132static int
133nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
134 struct nfs_fattr *fattr)
135{
136 struct rpc_message msg = {
137 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
138 .rpc_argp = fhandle,
139 .rpc_resp = fattr,
140 };
141 int status;
142
143 dprintk("NFS call getattr\n");
144 nfs_fattr_init(fattr);
145 status = rpc_call_sync(server->client, &msg, 0);
146 dprintk("NFS reply getattr: %d\n", status);
147 return status;
148}
149
150static int
151nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
152 struct iattr *sattr)
153{
154 struct inode *inode = dentry->d_inode;
155 struct nfs_sattrargs arg = {
156 .fh = NFS_FH(inode),
157 .sattr = sattr
158 };
159 struct rpc_message msg = {
160 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
161 .rpc_argp = &arg,
162 .rpc_resp = fattr,
163 };
164 int status;
165
166 /* Mask out the non-modebit related stuff from attr->ia_mode */
167 sattr->ia_mode &= S_IALLUGO;
168
169 dprintk("NFS call setattr\n");
170 if (sattr->ia_valid & ATTR_FILE)
171 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
172 nfs_fattr_init(fattr);
173 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
174 if (status == 0)
175 nfs_setattr_update_inode(inode, sattr);
176 dprintk("NFS reply setattr: %d\n", status);
177 return status;
178}
179
180static int
181nfs_proc_lookup(struct inode *dir, struct qstr *name,
182 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
183{
184 struct nfs_diropargs arg = {
185 .fh = NFS_FH(dir),
186 .name = name->name,
187 .len = name->len
188 };
189 struct nfs_diropok res = {
190 .fh = fhandle,
191 .fattr = fattr
192 };
193 struct rpc_message msg = {
194 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
195 .rpc_argp = &arg,
196 .rpc_resp = &res,
197 };
198 int status;
199
200 dprintk("NFS call lookup %s\n", name->name);
201 nfs_fattr_init(fattr);
202 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
203 dprintk("NFS reply lookup: %d\n", status);
204 return status;
205}
206
207static int nfs_proc_readlink(struct inode *inode, struct page *page,
208 unsigned int pgbase, unsigned int pglen)
209{
210 struct nfs_readlinkargs args = {
211 .fh = NFS_FH(inode),
212 .pgbase = pgbase,
213 .pglen = pglen,
214 .pages = &page
215 };
216 struct rpc_message msg = {
217 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
218 .rpc_argp = &args,
219 };
220 int status;
221
222 dprintk("NFS call readlink\n");
223 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
224 dprintk("NFS reply readlink: %d\n", status);
225 return status;
226}
227
228struct nfs_createdata {
229 struct nfs_createargs arg;
230 struct nfs_diropok res;
231 struct nfs_fh fhandle;
232 struct nfs_fattr fattr;
233};
234
235static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
236 struct dentry *dentry, struct iattr *sattr)
237{
238 struct nfs_createdata *data;
239
240 data = kmalloc(sizeof(*data), GFP_KERNEL);
241
242 if (data != NULL) {
243 data->arg.fh = NFS_FH(dir);
244 data->arg.name = dentry->d_name.name;
245 data->arg.len = dentry->d_name.len;
246 data->arg.sattr = sattr;
247 nfs_fattr_init(&data->fattr);
248 data->fhandle.size = 0;
249 data->res.fh = &data->fhandle;
250 data->res.fattr = &data->fattr;
251 }
252 return data;
253};
254
255static void nfs_free_createdata(const struct nfs_createdata *data)
256{
257 kfree(data);
258}
259
260static int
261nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
262 int flags, struct nfs_open_context *ctx)
263{
264 struct nfs_createdata *data;
265 struct rpc_message msg = {
266 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
267 };
268 int status = -ENOMEM;
269
270 dprintk("NFS call create %s\n", dentry->d_name.name);
271 data = nfs_alloc_createdata(dir, dentry, sattr);
272 if (data == NULL)
273 goto out;
274 msg.rpc_argp = &data->arg;
275 msg.rpc_resp = &data->res;
276 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
277 nfs_mark_for_revalidate(dir);
278 if (status == 0)
279 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
280 nfs_free_createdata(data);
281out:
282 dprintk("NFS reply create: %d\n", status);
283 return status;
284}
285
286/*
287 * In NFSv2, mknod is grafted onto the create call.
288 */
289static int
290nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
291 dev_t rdev)
292{
293 struct nfs_createdata *data;
294 struct rpc_message msg = {
295 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
296 };
297 umode_t mode;
298 int status = -ENOMEM;
299
300 dprintk("NFS call mknod %s\n", dentry->d_name.name);
301
302 mode = sattr->ia_mode;
303 if (S_ISFIFO(mode)) {
304 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
305 sattr->ia_valid &= ~ATTR_SIZE;
306 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
307 sattr->ia_valid |= ATTR_SIZE;
308 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
309 }
310
311 data = nfs_alloc_createdata(dir, dentry, sattr);
312 if (data == NULL)
313 goto out;
314 msg.rpc_argp = &data->arg;
315 msg.rpc_resp = &data->res;
316
317 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
318 nfs_mark_for_revalidate(dir);
319
320 if (status == -EINVAL && S_ISFIFO(mode)) {
321 sattr->ia_mode = mode;
322 nfs_fattr_init(data->res.fattr);
323 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
324 }
325 if (status == 0)
326 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
327 nfs_free_createdata(data);
328out:
329 dprintk("NFS reply mknod: %d\n", status);
330 return status;
331}
332
333static int
334nfs_proc_remove(struct inode *dir, struct qstr *name)
335{
336 struct nfs_removeargs arg = {
337 .fh = NFS_FH(dir),
338 .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 void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
361{
362 rpc_call_start(task);
363}
364
365static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
366{
367 if (nfs_async_handle_expired_key(task))
368 return 0;
369 nfs_mark_for_revalidate(dir);
370 return 1;
371}
372
373static void
374nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
375{
376 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
377}
378
379static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
380{
381 rpc_call_start(task);
382}
383
384static int
385nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
386 struct inode *new_dir)
387{
388 if (nfs_async_handle_expired_key(task))
389 return 0;
390 nfs_mark_for_revalidate(old_dir);
391 nfs_mark_for_revalidate(new_dir);
392 return 1;
393}
394
395static int
396nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
397 struct inode *new_dir, struct qstr *new_name)
398{
399 struct nfs_renameargs arg = {
400 .old_dir = NFS_FH(old_dir),
401 .old_name = old_name,
402 .new_dir = NFS_FH(new_dir),
403 .new_name = new_name,
404 };
405 struct rpc_message msg = {
406 .rpc_proc = &nfs_procedures[NFSPROC_RENAME],
407 .rpc_argp = &arg,
408 };
409 int status;
410
411 dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
412 status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
413 nfs_mark_for_revalidate(old_dir);
414 nfs_mark_for_revalidate(new_dir);
415 dprintk("NFS reply rename: %d\n", status);
416 return status;
417}
418
419static int
420nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
421{
422 struct nfs_linkargs arg = {
423 .fromfh = NFS_FH(inode),
424 .tofh = NFS_FH(dir),
425 .toname = name->name,
426 .tolen = name->len
427 };
428 struct rpc_message msg = {
429 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
430 .rpc_argp = &arg,
431 };
432 int status;
433
434 dprintk("NFS call link %s\n", name->name);
435 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
436 nfs_mark_for_revalidate(inode);
437 nfs_mark_for_revalidate(dir);
438 dprintk("NFS reply link: %d\n", status);
439 return status;
440}
441
442static int
443nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
444 unsigned int len, struct iattr *sattr)
445{
446 struct nfs_fh *fh;
447 struct nfs_fattr *fattr;
448 struct nfs_symlinkargs arg = {
449 .fromfh = NFS_FH(dir),
450 .fromname = dentry->d_name.name,
451 .fromlen = dentry->d_name.len,
452 .pages = &page,
453 .pathlen = len,
454 .sattr = sattr
455 };
456 struct rpc_message msg = {
457 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
458 .rpc_argp = &arg,
459 };
460 int status = -ENAMETOOLONG;
461
462 dprintk("NFS call symlink %s\n", dentry->d_name.name);
463
464 if (len > NFS2_MAXPATHLEN)
465 goto out;
466
467 fh = nfs_alloc_fhandle();
468 fattr = nfs_alloc_fattr();
469 status = -ENOMEM;
470 if (fh == NULL || fattr == NULL)
471 goto out_free;
472
473 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
474 nfs_mark_for_revalidate(dir);
475
476 /*
477 * V2 SYMLINK requests don't return any attributes. Setting the
478 * filehandle size to zero indicates to nfs_instantiate that it
479 * should fill in the data with a LOOKUP call on the wire.
480 */
481 if (status == 0)
482 status = nfs_instantiate(dentry, fh, fattr);
483
484out_free:
485 nfs_free_fattr(fattr);
486 nfs_free_fhandle(fh);
487out:
488 dprintk("NFS reply symlink: %d\n", status);
489 return status;
490}
491
492static int
493nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
494{
495 struct nfs_createdata *data;
496 struct rpc_message msg = {
497 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
498 };
499 int status = -ENOMEM;
500
501 dprintk("NFS call mkdir %s\n", dentry->d_name.name);
502 data = nfs_alloc_createdata(dir, dentry, sattr);
503 if (data == NULL)
504 goto out;
505 msg.rpc_argp = &data->arg;
506 msg.rpc_resp = &data->res;
507
508 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
509 nfs_mark_for_revalidate(dir);
510 if (status == 0)
511 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
512 nfs_free_createdata(data);
513out:
514 dprintk("NFS reply mkdir: %d\n", status);
515 return status;
516}
517
518static int
519nfs_proc_rmdir(struct inode *dir, struct qstr *name)
520{
521 struct nfs_diropargs arg = {
522 .fh = NFS_FH(dir),
523 .name = name->name,
524 .len = name->len
525 };
526 struct rpc_message msg = {
527 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
528 .rpc_argp = &arg,
529 };
530 int status;
531
532 dprintk("NFS call rmdir %s\n", name->name);
533 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
534 nfs_mark_for_revalidate(dir);
535 dprintk("NFS reply rmdir: %d\n", status);
536 return status;
537}
538
539/*
540 * The READDIR implementation is somewhat hackish - we pass a temporary
541 * buffer to the encode function, which installs it in the receive
542 * the receive iovec. The decode function just parses the reply to make
543 * sure it is syntactically correct; the entries itself are decoded
544 * from nfs_readdir by calling the decode_entry function directly.
545 */
546static int
547nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
548 u64 cookie, struct page **pages, unsigned int count, int plus)
549{
550 struct inode *dir = dentry->d_inode;
551 struct nfs_readdirargs arg = {
552 .fh = NFS_FH(dir),
553 .cookie = cookie,
554 .count = count,
555 .pages = pages,
556 };
557 struct rpc_message msg = {
558 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
559 .rpc_argp = &arg,
560 .rpc_cred = cred,
561 };
562 int status;
563
564 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
565 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
566
567 nfs_invalidate_atime(dir);
568
569 dprintk("NFS reply readdir: %d\n", status);
570 return status;
571}
572
573static int
574nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
575 struct nfs_fsstat *stat)
576{
577 struct nfs2_fsstat fsinfo;
578 struct rpc_message msg = {
579 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
580 .rpc_argp = fhandle,
581 .rpc_resp = &fsinfo,
582 };
583 int status;
584
585 dprintk("NFS call statfs\n");
586 nfs_fattr_init(stat->fattr);
587 status = rpc_call_sync(server->client, &msg, 0);
588 dprintk("NFS reply statfs: %d\n", status);
589 if (status)
590 goto out;
591 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
592 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
593 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
594 stat->tfiles = 0;
595 stat->ffiles = 0;
596 stat->afiles = 0;
597out:
598 return status;
599}
600
601static int
602nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
603 struct nfs_fsinfo *info)
604{
605 struct nfs2_fsstat fsinfo;
606 struct rpc_message msg = {
607 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
608 .rpc_argp = fhandle,
609 .rpc_resp = &fsinfo,
610 };
611 int status;
612
613 dprintk("NFS call fsinfo\n");
614 nfs_fattr_init(info->fattr);
615 status = rpc_call_sync(server->client, &msg, 0);
616 dprintk("NFS reply fsinfo: %d\n", status);
617 if (status)
618 goto out;
619 info->rtmax = NFS_MAXDATA;
620 info->rtpref = fsinfo.tsize;
621 info->rtmult = fsinfo.bsize;
622 info->wtmax = NFS_MAXDATA;
623 info->wtpref = fsinfo.tsize;
624 info->wtmult = fsinfo.bsize;
625 info->dtpref = fsinfo.tsize;
626 info->maxfilesize = 0x7FFFFFFF;
627 info->lease_time = 0;
628out:
629 return status;
630}
631
632static int
633nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
634 struct nfs_pathconf *info)
635{
636 info->max_link = 0;
637 info->max_namelen = NFS2_MAXNAMLEN;
638 return 0;
639}
640
641static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
642{
643 struct inode *inode = data->header->inode;
644
645 if (nfs_async_handle_expired_key(task))
646 return -EAGAIN;
647
648 nfs_invalidate_atime(inode);
649 if (task->tk_status >= 0) {
650 nfs_refresh_inode(inode, data->res.fattr);
651 /* Emulate the eof flag, which isn't normally needed in NFSv2
652 * as it is guaranteed to always return the file attributes
653 */
654 if (data->args.offset + data->res.count >= data->res.fattr->size)
655 data->res.eof = 1;
656 }
657 return 0;
658}
659
660static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
661{
662 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
663}
664
665static void nfs_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
666{
667 rpc_call_start(task);
668}
669
670static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
671{
672 struct inode *inode = data->header->inode;
673
674 if (nfs_async_handle_expired_key(task))
675 return -EAGAIN;
676
677 if (task->tk_status >= 0)
678 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
679 return 0;
680}
681
682static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
683{
684 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
685 data->args.stable = NFS_FILE_SYNC;
686 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
687}
688
689static void nfs_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
690{
691 rpc_call_start(task);
692}
693
694static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
695{
696 BUG();
697}
698
699static void
700nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
701{
702 BUG();
703}
704
705static int
706nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
707{
708 struct inode *inode = filp->f_path.dentry->d_inode;
709
710 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
711}
712
713/* Helper functions for NFS lock bounds checking */
714#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
715static int nfs_lock_check_bounds(const struct file_lock *fl)
716{
717 __s32 start, end;
718
719 start = (__s32)fl->fl_start;
720 if ((loff_t)start != fl->fl_start)
721 goto out_einval;
722
723 if (fl->fl_end != OFFSET_MAX) {
724 end = (__s32)fl->fl_end;
725 if ((loff_t)end != fl->fl_end)
726 goto out_einval;
727 } else
728 end = NFS_LOCK32_OFFSET_MAX;
729
730 if (start < 0 || start > end)
731 goto out_einval;
732 return 0;
733out_einval:
734 return -EINVAL;
735}
736
737const struct nfs_rpc_ops nfs_v2_clientops = {
738 .version = 2, /* protocol version */
739 .dentry_ops = &nfs_dentry_operations,
740 .dir_inode_ops = &nfs_dir_inode_operations,
741 .file_inode_ops = &nfs_file_inode_operations,
742 .file_ops = &nfs_file_operations,
743 .getroot = nfs_proc_get_root,
744 .submount = nfs_submount,
745 .getattr = nfs_proc_getattr,
746 .setattr = nfs_proc_setattr,
747 .lookup = nfs_proc_lookup,
748 .access = NULL, /* access */
749 .readlink = nfs_proc_readlink,
750 .create = nfs_proc_create,
751 .remove = nfs_proc_remove,
752 .unlink_setup = nfs_proc_unlink_setup,
753 .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
754 .unlink_done = nfs_proc_unlink_done,
755 .rename = nfs_proc_rename,
756 .rename_setup = nfs_proc_rename_setup,
757 .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
758 .rename_done = nfs_proc_rename_done,
759 .link = nfs_proc_link,
760 .symlink = nfs_proc_symlink,
761 .mkdir = nfs_proc_mkdir,
762 .rmdir = nfs_proc_rmdir,
763 .readdir = nfs_proc_readdir,
764 .mknod = nfs_proc_mknod,
765 .statfs = nfs_proc_statfs,
766 .fsinfo = nfs_proc_fsinfo,
767 .pathconf = nfs_proc_pathconf,
768 .decode_dirent = nfs2_decode_dirent,
769 .read_setup = nfs_proc_read_setup,
770 .read_rpc_prepare = nfs_proc_read_rpc_prepare,
771 .read_done = nfs_read_done,
772 .write_setup = nfs_proc_write_setup,
773 .write_rpc_prepare = nfs_proc_write_rpc_prepare,
774 .write_done = nfs_write_done,
775 .commit_setup = nfs_proc_commit_setup,
776 .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
777 .lock = nfs_proc_lock,
778 .lock_check_bounds = nfs_lock_check_bounds,
779 .close_context = nfs_close_context,
780 .init_client = nfs_init_client,
781};