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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 <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};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/proc.c
4 *
5 * Copyright (C) 1992, 1993, 1994 Rick Sladkey
6 *
7 * OS-independent nfs remote procedure call functions
8 *
9 * Tuned by Alan Cox <A.Cox@swansea.ac.uk> for >3K buffers
10 * so at last we can have decent(ish) throughput off a
11 * Sun server.
12 *
13 * Coding optimized and cleaned up by Florian La Roche.
14 * Note: Error returns are optimized for NFS_OK, which isn't translated via
15 * nfs_stat_to_errno(), but happens to be already the right return code.
16 *
17 * Also, the code currently doesn't check the size of the packet, when
18 * it decodes the packet.
19 *
20 * Feel free to fix it and mail me the diffs if it worries you.
21 *
22 * Completely rewritten to support the new RPC call interface;
23 * rewrote and moved the entire XDR stuff to xdr.c
24 * --Olaf Kirch June 1996
25 *
26 * The code below initializes all auto variables explicitly, otherwise
27 * it will fail to work as a module (gcc generates a memset call for an
28 * incomplete struct).
29 */
30
31#include <linux/types.h>
32#include <linux/param.h>
33#include <linux/time.h>
34#include <linux/mm.h>
35#include <linux/errno.h>
36#include <linux/string.h>
37#include <linux/in.h>
38#include <linux/pagemap.h>
39#include <linux/sunrpc/clnt.h>
40#include <linux/nfs.h>
41#include <linux/nfs2.h>
42#include <linux/nfs_fs.h>
43#include <linux/nfs_page.h>
44#include <linux/lockd/bind.h>
45#include <linux/freezer.h>
46#include "internal.h"
47
48#define NFSDBG_FACILITY NFSDBG_PROC
49
50/*
51 * Bare-bones access to getattr: this is for nfs_read_super.
52 */
53static int
54nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
55 struct nfs_fsinfo *info)
56{
57 struct nfs_fattr *fattr = info->fattr;
58 struct nfs2_fsstat fsinfo;
59 struct rpc_message msg = {
60 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
61 .rpc_argp = fhandle,
62 .rpc_resp = fattr,
63 };
64 int status;
65
66 dprintk("%s: call getattr\n", __func__);
67 nfs_fattr_init(fattr);
68 status = rpc_call_sync(server->client, &msg, 0);
69 /* Retry with default authentication if different */
70 if (status && server->nfs_client->cl_rpcclient != server->client)
71 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
72 dprintk("%s: reply getattr: %d\n", __func__, status);
73 if (status)
74 return status;
75 dprintk("%s: call statfs\n", __func__);
76 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
77 msg.rpc_resp = &fsinfo;
78 status = rpc_call_sync(server->client, &msg, 0);
79 /* Retry with default authentication if different */
80 if (status && server->nfs_client->cl_rpcclient != server->client)
81 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
82 dprintk("%s: reply statfs: %d\n", __func__, status);
83 if (status)
84 return status;
85 info->rtmax = NFS_MAXDATA;
86 info->rtpref = fsinfo.tsize;
87 info->rtmult = fsinfo.bsize;
88 info->wtmax = NFS_MAXDATA;
89 info->wtpref = fsinfo.tsize;
90 info->wtmult = fsinfo.bsize;
91 info->dtpref = fsinfo.tsize;
92 info->maxfilesize = 0x7FFFFFFF;
93 info->lease_time = 0;
94 info->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED;
95 info->xattr_support = 0;
96 return 0;
97}
98
99/*
100 * One function for each procedure in the NFS protocol.
101 */
102static int
103nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
104 struct nfs_fattr *fattr, struct inode *inode)
105{
106 struct rpc_message msg = {
107 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
108 .rpc_argp = fhandle,
109 .rpc_resp = fattr,
110 };
111 int status;
112 unsigned short task_flags = 0;
113
114 /* Is this is an attribute revalidation, subject to softreval? */
115 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
116 task_flags |= RPC_TASK_TIMEOUT;
117
118 dprintk("NFS call getattr\n");
119 nfs_fattr_init(fattr);
120 status = rpc_call_sync(server->client, &msg, task_flags);
121 dprintk("NFS reply getattr: %d\n", status);
122 return status;
123}
124
125static int
126nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
127 struct iattr *sattr)
128{
129 struct inode *inode = d_inode(dentry);
130 struct nfs_sattrargs arg = {
131 .fh = NFS_FH(inode),
132 .sattr = sattr
133 };
134 struct rpc_message msg = {
135 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
136 .rpc_argp = &arg,
137 .rpc_resp = fattr,
138 };
139 int status;
140
141 /* Mask out the non-modebit related stuff from attr->ia_mode */
142 sattr->ia_mode &= S_IALLUGO;
143
144 dprintk("NFS call setattr\n");
145 if (sattr->ia_valid & ATTR_FILE)
146 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
147 nfs_fattr_init(fattr);
148 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
149 if (status == 0)
150 nfs_setattr_update_inode(inode, sattr, fattr);
151 dprintk("NFS reply setattr: %d\n", status);
152 return status;
153}
154
155static int
156nfs_proc_lookup(struct inode *dir, struct dentry *dentry,
157 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
158{
159 struct nfs_diropargs arg = {
160 .fh = NFS_FH(dir),
161 .name = dentry->d_name.name,
162 .len = dentry->d_name.len
163 };
164 struct nfs_diropok res = {
165 .fh = fhandle,
166 .fattr = fattr
167 };
168 struct rpc_message msg = {
169 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
170 .rpc_argp = &arg,
171 .rpc_resp = &res,
172 };
173 int status;
174 unsigned short task_flags = 0;
175
176 /* Is this is an attribute revalidation, subject to softreval? */
177 if (nfs_lookup_is_soft_revalidate(dentry))
178 task_flags |= RPC_TASK_TIMEOUT;
179
180 dprintk("NFS call lookup %pd2\n", dentry);
181 nfs_fattr_init(fattr);
182 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
183 dprintk("NFS reply lookup: %d\n", status);
184 return status;
185}
186
187static int nfs_proc_readlink(struct inode *inode, struct page *page,
188 unsigned int pgbase, unsigned int pglen)
189{
190 struct nfs_readlinkargs args = {
191 .fh = NFS_FH(inode),
192 .pgbase = pgbase,
193 .pglen = pglen,
194 .pages = &page
195 };
196 struct rpc_message msg = {
197 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
198 .rpc_argp = &args,
199 };
200 int status;
201
202 dprintk("NFS call readlink\n");
203 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
204 dprintk("NFS reply readlink: %d\n", status);
205 return status;
206}
207
208struct nfs_createdata {
209 struct nfs_createargs arg;
210 struct nfs_diropok res;
211 struct nfs_fh fhandle;
212 struct nfs_fattr fattr;
213};
214
215static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
216 struct dentry *dentry, struct iattr *sattr)
217{
218 struct nfs_createdata *data;
219
220 data = kmalloc(sizeof(*data), GFP_KERNEL);
221
222 if (data != NULL) {
223 data->arg.fh = NFS_FH(dir);
224 data->arg.name = dentry->d_name.name;
225 data->arg.len = dentry->d_name.len;
226 data->arg.sattr = sattr;
227 nfs_fattr_init(&data->fattr);
228 data->fhandle.size = 0;
229 data->res.fh = &data->fhandle;
230 data->res.fattr = &data->fattr;
231 }
232 return data;
233};
234
235static void nfs_free_createdata(const struct nfs_createdata *data)
236{
237 kfree(data);
238}
239
240static int
241nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
242 int flags)
243{
244 struct nfs_createdata *data;
245 struct rpc_message msg = {
246 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
247 };
248 int status = -ENOMEM;
249
250 dprintk("NFS call create %pd\n", dentry);
251 data = nfs_alloc_createdata(dir, dentry, sattr);
252 if (data == NULL)
253 goto out;
254 msg.rpc_argp = &data->arg;
255 msg.rpc_resp = &data->res;
256 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
257 nfs_mark_for_revalidate(dir);
258 if (status == 0)
259 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
260 nfs_free_createdata(data);
261out:
262 dprintk("NFS reply create: %d\n", status);
263 return status;
264}
265
266/*
267 * In NFSv2, mknod is grafted onto the create call.
268 */
269static int
270nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
271 dev_t rdev)
272{
273 struct nfs_createdata *data;
274 struct rpc_message msg = {
275 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
276 };
277 umode_t mode;
278 int status = -ENOMEM;
279
280 dprintk("NFS call mknod %pd\n", dentry);
281
282 mode = sattr->ia_mode;
283 if (S_ISFIFO(mode)) {
284 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
285 sattr->ia_valid &= ~ATTR_SIZE;
286 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
287 sattr->ia_valid |= ATTR_SIZE;
288 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
289 }
290
291 data = nfs_alloc_createdata(dir, dentry, sattr);
292 if (data == NULL)
293 goto out;
294 msg.rpc_argp = &data->arg;
295 msg.rpc_resp = &data->res;
296
297 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
298 nfs_mark_for_revalidate(dir);
299
300 if (status == -EINVAL && S_ISFIFO(mode)) {
301 sattr->ia_mode = mode;
302 nfs_fattr_init(data->res.fattr);
303 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
304 }
305 if (status == 0)
306 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
307 nfs_free_createdata(data);
308out:
309 dprintk("NFS reply mknod: %d\n", status);
310 return status;
311}
312
313static int
314nfs_proc_remove(struct inode *dir, struct dentry *dentry)
315{
316 struct nfs_removeargs arg = {
317 .fh = NFS_FH(dir),
318 .name = dentry->d_name,
319 };
320 struct rpc_message msg = {
321 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
322 .rpc_argp = &arg,
323 };
324 int status;
325
326 dprintk("NFS call remove %pd2\n",dentry);
327 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
328 nfs_mark_for_revalidate(dir);
329
330 dprintk("NFS reply remove: %d\n", status);
331 return status;
332}
333
334static void
335nfs_proc_unlink_setup(struct rpc_message *msg,
336 struct dentry *dentry,
337 struct inode *inode)
338{
339 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
340}
341
342static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
343{
344 rpc_call_start(task);
345}
346
347static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
348{
349 nfs_mark_for_revalidate(dir);
350 return 1;
351}
352
353static void
354nfs_proc_rename_setup(struct rpc_message *msg,
355 struct dentry *old_dentry,
356 struct dentry *new_dentry)
357{
358 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
359}
360
361static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
362{
363 rpc_call_start(task);
364}
365
366static int
367nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
368 struct inode *new_dir)
369{
370 nfs_mark_for_revalidate(old_dir);
371 nfs_mark_for_revalidate(new_dir);
372 return 1;
373}
374
375static int
376nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
377{
378 struct nfs_linkargs arg = {
379 .fromfh = NFS_FH(inode),
380 .tofh = NFS_FH(dir),
381 .toname = name->name,
382 .tolen = name->len
383 };
384 struct rpc_message msg = {
385 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
386 .rpc_argp = &arg,
387 };
388 int status;
389
390 dprintk("NFS call link %s\n", name->name);
391 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
392 nfs_mark_for_revalidate(inode);
393 nfs_mark_for_revalidate(dir);
394 dprintk("NFS reply link: %d\n", status);
395 return status;
396}
397
398static int
399nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct folio *folio,
400 unsigned int len, struct iattr *sattr)
401{
402 struct page *page = &folio->page;
403 struct nfs_fh *fh;
404 struct nfs_fattr *fattr;
405 struct nfs_symlinkargs arg = {
406 .fromfh = NFS_FH(dir),
407 .fromname = dentry->d_name.name,
408 .fromlen = dentry->d_name.len,
409 .pages = &page,
410 .pathlen = len,
411 .sattr = sattr
412 };
413 struct rpc_message msg = {
414 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
415 .rpc_argp = &arg,
416 };
417 int status = -ENAMETOOLONG;
418
419 dprintk("NFS call symlink %pd\n", dentry);
420
421 if (len > NFS2_MAXPATHLEN)
422 goto out;
423
424 fh = nfs_alloc_fhandle();
425 fattr = nfs_alloc_fattr();
426 status = -ENOMEM;
427 if (fh == NULL || fattr == NULL)
428 goto out_free;
429
430 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
431 nfs_mark_for_revalidate(dir);
432
433 /*
434 * V2 SYMLINK requests don't return any attributes. Setting the
435 * filehandle size to zero indicates to nfs_instantiate that it
436 * should fill in the data with a LOOKUP call on the wire.
437 */
438 if (status == 0)
439 status = nfs_instantiate(dentry, fh, fattr);
440
441out_free:
442 nfs_free_fattr(fattr);
443 nfs_free_fhandle(fh);
444out:
445 dprintk("NFS reply symlink: %d\n", status);
446 return status;
447}
448
449static int
450nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
451{
452 struct nfs_createdata *data;
453 struct rpc_message msg = {
454 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
455 };
456 int status = -ENOMEM;
457
458 dprintk("NFS call mkdir %pd\n", dentry);
459 data = nfs_alloc_createdata(dir, dentry, sattr);
460 if (data == NULL)
461 goto out;
462 msg.rpc_argp = &data->arg;
463 msg.rpc_resp = &data->res;
464
465 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
466 nfs_mark_for_revalidate(dir);
467 if (status == 0)
468 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
469 nfs_free_createdata(data);
470out:
471 dprintk("NFS reply mkdir: %d\n", status);
472 return status;
473}
474
475static int
476nfs_proc_rmdir(struct inode *dir, const struct qstr *name)
477{
478 struct nfs_diropargs arg = {
479 .fh = NFS_FH(dir),
480 .name = name->name,
481 .len = name->len
482 };
483 struct rpc_message msg = {
484 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
485 .rpc_argp = &arg,
486 };
487 int status;
488
489 dprintk("NFS call rmdir %s\n", name->name);
490 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
491 nfs_mark_for_revalidate(dir);
492 dprintk("NFS reply rmdir: %d\n", status);
493 return status;
494}
495
496/*
497 * The READDIR implementation is somewhat hackish - we pass a temporary
498 * buffer to the encode function, which installs it in the receive
499 * the receive iovec. The decode function just parses the reply to make
500 * sure it is syntactically correct; the entries itself are decoded
501 * from nfs_readdir by calling the decode_entry function directly.
502 */
503static int nfs_proc_readdir(struct nfs_readdir_arg *nr_arg,
504 struct nfs_readdir_res *nr_res)
505{
506 struct inode *dir = d_inode(nr_arg->dentry);
507 struct nfs_readdirargs arg = {
508 .fh = NFS_FH(dir),
509 .cookie = nr_arg->cookie,
510 .count = nr_arg->page_len,
511 .pages = nr_arg->pages,
512 };
513 struct rpc_message msg = {
514 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
515 .rpc_argp = &arg,
516 .rpc_cred = nr_arg->cred,
517 };
518 int status;
519
520 dprintk("NFS call readdir %llu\n", (unsigned long long)nr_arg->cookie);
521 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
522 nr_res->verf[0] = nr_res->verf[1] = 0;
523
524 nfs_invalidate_atime(dir);
525
526 dprintk("NFS reply readdir: %d\n", status);
527 return status;
528}
529
530static int
531nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
532 struct nfs_fsstat *stat)
533{
534 struct nfs2_fsstat fsinfo;
535 struct rpc_message msg = {
536 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
537 .rpc_argp = fhandle,
538 .rpc_resp = &fsinfo,
539 };
540 int status;
541
542 dprintk("NFS call statfs\n");
543 nfs_fattr_init(stat->fattr);
544 status = rpc_call_sync(server->client, &msg, 0);
545 dprintk("NFS reply statfs: %d\n", status);
546 if (status)
547 goto out;
548 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
549 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
550 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
551 stat->tfiles = 0;
552 stat->ffiles = 0;
553 stat->afiles = 0;
554out:
555 return status;
556}
557
558static int
559nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
560 struct nfs_fsinfo *info)
561{
562 struct nfs2_fsstat fsinfo;
563 struct rpc_message msg = {
564 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
565 .rpc_argp = fhandle,
566 .rpc_resp = &fsinfo,
567 };
568 int status;
569
570 dprintk("NFS call fsinfo\n");
571 nfs_fattr_init(info->fattr);
572 status = rpc_call_sync(server->client, &msg, 0);
573 dprintk("NFS reply fsinfo: %d\n", status);
574 if (status)
575 goto out;
576 info->rtmax = NFS_MAXDATA;
577 info->rtpref = fsinfo.tsize;
578 info->rtmult = fsinfo.bsize;
579 info->wtmax = NFS_MAXDATA;
580 info->wtpref = fsinfo.tsize;
581 info->wtmult = fsinfo.bsize;
582 info->dtpref = fsinfo.tsize;
583 info->maxfilesize = 0x7FFFFFFF;
584 info->lease_time = 0;
585out:
586 return status;
587}
588
589static int
590nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
591 struct nfs_pathconf *info)
592{
593 info->max_link = 0;
594 info->max_namelen = NFS2_MAXNAMLEN;
595 return 0;
596}
597
598static int nfs_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
599{
600 struct inode *inode = hdr->inode;
601
602 nfs_invalidate_atime(inode);
603 if (task->tk_status >= 0) {
604 nfs_refresh_inode(inode, hdr->res.fattr);
605 /* Emulate the eof flag, which isn't normally needed in NFSv2
606 * as it is guaranteed to always return the file attributes
607 */
608 if ((hdr->res.count == 0 && hdr->args.count > 0) ||
609 hdr->args.offset + hdr->res.count >= hdr->res.fattr->size)
610 hdr->res.eof = 1;
611 }
612 return 0;
613}
614
615static void nfs_proc_read_setup(struct nfs_pgio_header *hdr,
616 struct rpc_message *msg)
617{
618 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
619}
620
621static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task,
622 struct nfs_pgio_header *hdr)
623{
624 rpc_call_start(task);
625 return 0;
626}
627
628static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
629{
630 if (task->tk_status >= 0) {
631 hdr->res.count = hdr->args.count;
632 nfs_writeback_update_inode(hdr);
633 }
634 return 0;
635}
636
637static void nfs_proc_write_setup(struct nfs_pgio_header *hdr,
638 struct rpc_message *msg,
639 struct rpc_clnt **clnt)
640{
641 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
642 hdr->args.stable = NFS_FILE_SYNC;
643 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
644}
645
646static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
647{
648 BUG();
649}
650
651static void
652nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
653 struct rpc_clnt **clnt)
654{
655 BUG();
656}
657
658static int
659nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
660{
661 struct inode *inode = file_inode(filp);
662
663 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, NULL);
664}
665
666/* Helper functions for NFS lock bounds checking */
667#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
668static int nfs_lock_check_bounds(const struct file_lock *fl)
669{
670 __s32 start, end;
671
672 start = (__s32)fl->fl_start;
673 if ((loff_t)start != fl->fl_start)
674 goto out_einval;
675
676 if (fl->fl_end != OFFSET_MAX) {
677 end = (__s32)fl->fl_end;
678 if ((loff_t)end != fl->fl_end)
679 goto out_einval;
680 } else
681 end = NFS_LOCK32_OFFSET_MAX;
682
683 if (start < 0 || start > end)
684 goto out_einval;
685 return 0;
686out_einval:
687 return -EINVAL;
688}
689
690static int nfs_have_delegation(struct inode *inode, fmode_t type, int flags)
691{
692 return 0;
693}
694
695static int nfs_return_delegation(struct inode *inode)
696{
697 if (S_ISREG(inode->i_mode))
698 nfs_wb_all(inode);
699 return 0;
700}
701
702static const struct inode_operations nfs_dir_inode_operations = {
703 .create = nfs_create,
704 .lookup = nfs_lookup,
705 .atomic_open = nfs_atomic_open_v23,
706 .link = nfs_link,
707 .unlink = nfs_unlink,
708 .symlink = nfs_symlink,
709 .mkdir = nfs_mkdir,
710 .rmdir = nfs_rmdir,
711 .mknod = nfs_mknod,
712 .rename = nfs_rename,
713 .permission = nfs_permission,
714 .getattr = nfs_getattr,
715 .setattr = nfs_setattr,
716};
717
718static const struct inode_operations nfs_file_inode_operations = {
719 .permission = nfs_permission,
720 .getattr = nfs_getattr,
721 .setattr = nfs_setattr,
722};
723
724const struct nfs_rpc_ops nfs_v2_clientops = {
725 .version = 2, /* protocol version */
726 .dentry_ops = &nfs_dentry_operations,
727 .dir_inode_ops = &nfs_dir_inode_operations,
728 .file_inode_ops = &nfs_file_inode_operations,
729 .file_ops = &nfs_file_operations,
730 .getroot = nfs_proc_get_root,
731 .submount = nfs_submount,
732 .try_get_tree = nfs_try_get_tree,
733 .getattr = nfs_proc_getattr,
734 .setattr = nfs_proc_setattr,
735 .lookup = nfs_proc_lookup,
736 .access = NULL, /* access */
737 .readlink = nfs_proc_readlink,
738 .create = nfs_proc_create,
739 .remove = nfs_proc_remove,
740 .unlink_setup = nfs_proc_unlink_setup,
741 .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
742 .unlink_done = nfs_proc_unlink_done,
743 .rename_setup = nfs_proc_rename_setup,
744 .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
745 .rename_done = nfs_proc_rename_done,
746 .link = nfs_proc_link,
747 .symlink = nfs_proc_symlink,
748 .mkdir = nfs_proc_mkdir,
749 .rmdir = nfs_proc_rmdir,
750 .readdir = nfs_proc_readdir,
751 .mknod = nfs_proc_mknod,
752 .statfs = nfs_proc_statfs,
753 .fsinfo = nfs_proc_fsinfo,
754 .pathconf = nfs_proc_pathconf,
755 .decode_dirent = nfs2_decode_dirent,
756 .pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare,
757 .read_setup = nfs_proc_read_setup,
758 .read_done = nfs_read_done,
759 .write_setup = nfs_proc_write_setup,
760 .write_done = nfs_write_done,
761 .commit_setup = nfs_proc_commit_setup,
762 .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
763 .lock = nfs_proc_lock,
764 .lock_check_bounds = nfs_lock_check_bounds,
765 .close_context = nfs_close_context,
766 .have_delegation = nfs_have_delegation,
767 .return_delegation = nfs_return_delegation,
768 .alloc_client = nfs_alloc_client,
769 .init_client = nfs_init_client,
770 .free_client = nfs_free_client,
771 .create_server = nfs_create_server,
772 .clone_server = nfs_clone_server,
773};