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 */
53 static int
nfs_proc_get_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)54 nfs_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 */
102 static int
nfs_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)103 nfs_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
125 static int
nfs_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)126 nfs_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
155 static int
nfs_proc_lookup(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)156 nfs_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
nfs_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)187 static 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
208 struct nfs_createdata {
209 struct nfs_createargs arg;
210 struct nfs_diropok res;
211 struct nfs_fh fhandle;
212 struct nfs_fattr fattr;
213 };
214
nfs_alloc_createdata(struct inode * dir,struct dentry * dentry,struct iattr * sattr)215 static 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
nfs_free_createdata(const struct nfs_createdata * data)235 static void nfs_free_createdata(const struct nfs_createdata *data)
236 {
237 kfree(data);
238 }
239
240 static int
nfs_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)241 nfs_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);
261 out:
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 */
269 static int
nfs_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)270 nfs_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);
308 out:
309 dprintk("NFS reply mknod: %d\n", status);
310 return status;
311 }
312
313 static int
nfs_proc_remove(struct inode * dir,struct dentry * dentry)314 nfs_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
334 static void
nfs_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)335 nfs_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
nfs_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)342 static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
343 {
344 rpc_call_start(task);
345 }
346
nfs_proc_unlink_done(struct rpc_task * task,struct inode * dir)347 static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
348 {
349 nfs_mark_for_revalidate(dir);
350 return 1;
351 }
352
353 static void
nfs_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)354 nfs_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
nfs_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)361 static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
362 {
363 rpc_call_start(task);
364 }
365
366 static int
nfs_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)367 nfs_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
375 static int
nfs_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)376 nfs_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
398 static int
nfs_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr)399 nfs_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
441 out_free:
442 nfs_free_fattr(fattr);
443 nfs_free_fhandle(fh);
444 out:
445 dprintk("NFS reply symlink: %d\n", status);
446 return status;
447 }
448
449 static int
nfs_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)450 nfs_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);
470 out:
471 dprintk("NFS reply mkdir: %d\n", status);
472 return status;
473 }
474
475 static int
nfs_proc_rmdir(struct inode * dir,const struct qstr * name)476 nfs_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 */
nfs_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)503 static 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
530 static int
nfs_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * stat)531 nfs_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;
554 out:
555 return status;
556 }
557
558 static int
nfs_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)559 nfs_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;
585 out:
586 return status;
587 }
588
589 static int
nfs_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * info)590 nfs_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
nfs_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)598 static 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
nfs_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)615 static 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
nfs_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)621 static 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
nfs_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)628 static 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
nfs_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)637 static 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
nfs_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)646 static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
647 {
648 BUG();
649 }
650
651 static void
nfs_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)652 nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
653 struct rpc_clnt **clnt)
654 {
655 BUG();
656 }
657
658 static int
nfs_proc_lock(struct file * filp,int cmd,struct file_lock * fl)659 nfs_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)
nfs_lock_check_bounds(const struct file_lock * fl)668 static 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;
686 out_einval:
687 return -EINVAL;
688 }
689
nfs_have_delegation(struct inode * inode,fmode_t type,int flags)690 static int nfs_have_delegation(struct inode *inode, fmode_t type, int flags)
691 {
692 return 0;
693 }
694
nfs_return_delegation(struct inode * inode)695 static 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
702 static 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
718 static const struct inode_operations nfs_file_inode_operations = {
719 .permission = nfs_permission,
720 .getattr = nfs_getattr,
721 .setattr = nfs_setattr,
722 };
723
724 const 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 };
774