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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 * Bare-bones access to getattr: this is for nfs_read_super.
51 */
52static int
53nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
54 struct nfs_fsinfo *info)
55{
56 struct nfs_fattr *fattr = info->fattr;
57 struct nfs2_fsstat fsinfo;
58 struct rpc_message msg = {
59 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
60 .rpc_argp = fhandle,
61 .rpc_resp = fattr,
62 };
63 int status;
64
65 dprintk("%s: call getattr\n", __func__);
66 nfs_fattr_init(fattr);
67 status = rpc_call_sync(server->client, &msg, 0);
68 /* Retry with default authentication if different */
69 if (status && server->nfs_client->cl_rpcclient != server->client)
70 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
71 dprintk("%s: reply getattr: %d\n", __func__, status);
72 if (status)
73 return status;
74 dprintk("%s: call statfs\n", __func__);
75 msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
76 msg.rpc_resp = &fsinfo;
77 status = rpc_call_sync(server->client, &msg, 0);
78 /* Retry with default authentication if different */
79 if (status && server->nfs_client->cl_rpcclient != server->client)
80 status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
81 dprintk("%s: reply statfs: %d\n", __func__, status);
82 if (status)
83 return status;
84 info->rtmax = NFS_MAXDATA;
85 info->rtpref = fsinfo.tsize;
86 info->rtmult = fsinfo.bsize;
87 info->wtmax = NFS_MAXDATA;
88 info->wtpref = fsinfo.tsize;
89 info->wtmult = fsinfo.bsize;
90 info->dtpref = fsinfo.tsize;
91 info->maxfilesize = 0x7FFFFFFF;
92 info->lease_time = 0;
93 return 0;
94}
95
96/*
97 * One function for each procedure in the NFS protocol.
98 */
99static int
100nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
101 struct nfs_fattr *fattr, struct nfs4_label *label)
102{
103 struct rpc_message msg = {
104 .rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
105 .rpc_argp = fhandle,
106 .rpc_resp = fattr,
107 };
108 int status;
109
110 dprintk("NFS call getattr\n");
111 nfs_fattr_init(fattr);
112 status = rpc_call_sync(server->client, &msg, 0);
113 dprintk("NFS reply getattr: %d\n", status);
114 return status;
115}
116
117static int
118nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
119 struct iattr *sattr)
120{
121 struct inode *inode = d_inode(dentry);
122 struct nfs_sattrargs arg = {
123 .fh = NFS_FH(inode),
124 .sattr = sattr
125 };
126 struct rpc_message msg = {
127 .rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
128 .rpc_argp = &arg,
129 .rpc_resp = fattr,
130 };
131 int status;
132
133 /* Mask out the non-modebit related stuff from attr->ia_mode */
134 sattr->ia_mode &= S_IALLUGO;
135
136 dprintk("NFS call setattr\n");
137 if (sattr->ia_valid & ATTR_FILE)
138 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
139 nfs_fattr_init(fattr);
140 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
141 if (status == 0)
142 nfs_setattr_update_inode(inode, sattr, fattr);
143 dprintk("NFS reply setattr: %d\n", status);
144 return status;
145}
146
147static int
148nfs_proc_lookup(struct inode *dir, const struct qstr *name,
149 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
150 struct nfs4_label *label)
151{
152 struct nfs_diropargs arg = {
153 .fh = NFS_FH(dir),
154 .name = name->name,
155 .len = name->len
156 };
157 struct nfs_diropok res = {
158 .fh = fhandle,
159 .fattr = fattr
160 };
161 struct rpc_message msg = {
162 .rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
163 .rpc_argp = &arg,
164 .rpc_resp = &res,
165 };
166 int status;
167
168 dprintk("NFS call lookup %s\n", name->name);
169 nfs_fattr_init(fattr);
170 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
171 dprintk("NFS reply lookup: %d\n", status);
172 return status;
173}
174
175static int nfs_proc_readlink(struct inode *inode, struct page *page,
176 unsigned int pgbase, unsigned int pglen)
177{
178 struct nfs_readlinkargs args = {
179 .fh = NFS_FH(inode),
180 .pgbase = pgbase,
181 .pglen = pglen,
182 .pages = &page
183 };
184 struct rpc_message msg = {
185 .rpc_proc = &nfs_procedures[NFSPROC_READLINK],
186 .rpc_argp = &args,
187 };
188 int status;
189
190 dprintk("NFS call readlink\n");
191 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
192 dprintk("NFS reply readlink: %d\n", status);
193 return status;
194}
195
196struct nfs_createdata {
197 struct nfs_createargs arg;
198 struct nfs_diropok res;
199 struct nfs_fh fhandle;
200 struct nfs_fattr fattr;
201};
202
203static struct nfs_createdata *nfs_alloc_createdata(struct inode *dir,
204 struct dentry *dentry, struct iattr *sattr)
205{
206 struct nfs_createdata *data;
207
208 data = kmalloc(sizeof(*data), GFP_KERNEL);
209
210 if (data != NULL) {
211 data->arg.fh = NFS_FH(dir);
212 data->arg.name = dentry->d_name.name;
213 data->arg.len = dentry->d_name.len;
214 data->arg.sattr = sattr;
215 nfs_fattr_init(&data->fattr);
216 data->fhandle.size = 0;
217 data->res.fh = &data->fhandle;
218 data->res.fattr = &data->fattr;
219 }
220 return data;
221};
222
223static void nfs_free_createdata(const struct nfs_createdata *data)
224{
225 kfree(data);
226}
227
228static int
229nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
230 int flags)
231{
232 struct nfs_createdata *data;
233 struct rpc_message msg = {
234 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
235 };
236 int status = -ENOMEM;
237
238 dprintk("NFS call create %pd\n", dentry);
239 data = nfs_alloc_createdata(dir, dentry, sattr);
240 if (data == NULL)
241 goto out;
242 msg.rpc_argp = &data->arg;
243 msg.rpc_resp = &data->res;
244 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
245 nfs_mark_for_revalidate(dir);
246 if (status == 0)
247 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
248 nfs_free_createdata(data);
249out:
250 dprintk("NFS reply create: %d\n", status);
251 return status;
252}
253
254/*
255 * In NFSv2, mknod is grafted onto the create call.
256 */
257static int
258nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
259 dev_t rdev)
260{
261 struct nfs_createdata *data;
262 struct rpc_message msg = {
263 .rpc_proc = &nfs_procedures[NFSPROC_CREATE],
264 };
265 umode_t mode;
266 int status = -ENOMEM;
267
268 dprintk("NFS call mknod %pd\n", dentry);
269
270 mode = sattr->ia_mode;
271 if (S_ISFIFO(mode)) {
272 sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
273 sattr->ia_valid &= ~ATTR_SIZE;
274 } else if (S_ISCHR(mode) || S_ISBLK(mode)) {
275 sattr->ia_valid |= ATTR_SIZE;
276 sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
277 }
278
279 data = nfs_alloc_createdata(dir, dentry, sattr);
280 if (data == NULL)
281 goto out;
282 msg.rpc_argp = &data->arg;
283 msg.rpc_resp = &data->res;
284
285 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
286 nfs_mark_for_revalidate(dir);
287
288 if (status == -EINVAL && S_ISFIFO(mode)) {
289 sattr->ia_mode = mode;
290 nfs_fattr_init(data->res.fattr);
291 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
292 }
293 if (status == 0)
294 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
295 nfs_free_createdata(data);
296out:
297 dprintk("NFS reply mknod: %d\n", status);
298 return status;
299}
300
301static int
302nfs_proc_remove(struct inode *dir, const struct qstr *name)
303{
304 struct nfs_removeargs arg = {
305 .fh = NFS_FH(dir),
306 .name = *name,
307 };
308 struct rpc_message msg = {
309 .rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
310 .rpc_argp = &arg,
311 };
312 int status;
313
314 dprintk("NFS call remove %s\n", name->name);
315 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
316 nfs_mark_for_revalidate(dir);
317
318 dprintk("NFS reply remove: %d\n", status);
319 return status;
320}
321
322static void
323nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
324{
325 msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
326}
327
328static void nfs_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
329{
330 rpc_call_start(task);
331}
332
333static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
334{
335 nfs_mark_for_revalidate(dir);
336 return 1;
337}
338
339static void
340nfs_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
341{
342 msg->rpc_proc = &nfs_procedures[NFSPROC_RENAME];
343}
344
345static void nfs_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
346{
347 rpc_call_start(task);
348}
349
350static int
351nfs_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
352 struct inode *new_dir)
353{
354 nfs_mark_for_revalidate(old_dir);
355 nfs_mark_for_revalidate(new_dir);
356 return 1;
357}
358
359static int
360nfs_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
361{
362 struct nfs_linkargs arg = {
363 .fromfh = NFS_FH(inode),
364 .tofh = NFS_FH(dir),
365 .toname = name->name,
366 .tolen = name->len
367 };
368 struct rpc_message msg = {
369 .rpc_proc = &nfs_procedures[NFSPROC_LINK],
370 .rpc_argp = &arg,
371 };
372 int status;
373
374 dprintk("NFS call link %s\n", name->name);
375 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
376 nfs_mark_for_revalidate(inode);
377 nfs_mark_for_revalidate(dir);
378 dprintk("NFS reply link: %d\n", status);
379 return status;
380}
381
382static int
383nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
384 unsigned int len, struct iattr *sattr)
385{
386 struct nfs_fh *fh;
387 struct nfs_fattr *fattr;
388 struct nfs_symlinkargs arg = {
389 .fromfh = NFS_FH(dir),
390 .fromname = dentry->d_name.name,
391 .fromlen = dentry->d_name.len,
392 .pages = &page,
393 .pathlen = len,
394 .sattr = sattr
395 };
396 struct rpc_message msg = {
397 .rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
398 .rpc_argp = &arg,
399 };
400 int status = -ENAMETOOLONG;
401
402 dprintk("NFS call symlink %pd\n", dentry);
403
404 if (len > NFS2_MAXPATHLEN)
405 goto out;
406
407 fh = nfs_alloc_fhandle();
408 fattr = nfs_alloc_fattr();
409 status = -ENOMEM;
410 if (fh == NULL || fattr == NULL)
411 goto out_free;
412
413 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
414 nfs_mark_for_revalidate(dir);
415
416 /*
417 * V2 SYMLINK requests don't return any attributes. Setting the
418 * filehandle size to zero indicates to nfs_instantiate that it
419 * should fill in the data with a LOOKUP call on the wire.
420 */
421 if (status == 0)
422 status = nfs_instantiate(dentry, fh, fattr, NULL);
423
424out_free:
425 nfs_free_fattr(fattr);
426 nfs_free_fhandle(fh);
427out:
428 dprintk("NFS reply symlink: %d\n", status);
429 return status;
430}
431
432static int
433nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
434{
435 struct nfs_createdata *data;
436 struct rpc_message msg = {
437 .rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
438 };
439 int status = -ENOMEM;
440
441 dprintk("NFS call mkdir %pd\n", dentry);
442 data = nfs_alloc_createdata(dir, dentry, sattr);
443 if (data == NULL)
444 goto out;
445 msg.rpc_argp = &data->arg;
446 msg.rpc_resp = &data->res;
447
448 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
449 nfs_mark_for_revalidate(dir);
450 if (status == 0)
451 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, NULL);
452 nfs_free_createdata(data);
453out:
454 dprintk("NFS reply mkdir: %d\n", status);
455 return status;
456}
457
458static int
459nfs_proc_rmdir(struct inode *dir, const struct qstr *name)
460{
461 struct nfs_diropargs arg = {
462 .fh = NFS_FH(dir),
463 .name = name->name,
464 .len = name->len
465 };
466 struct rpc_message msg = {
467 .rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
468 .rpc_argp = &arg,
469 };
470 int status;
471
472 dprintk("NFS call rmdir %s\n", name->name);
473 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
474 nfs_mark_for_revalidate(dir);
475 dprintk("NFS reply rmdir: %d\n", status);
476 return status;
477}
478
479/*
480 * The READDIR implementation is somewhat hackish - we pass a temporary
481 * buffer to the encode function, which installs it in the receive
482 * the receive iovec. The decode function just parses the reply to make
483 * sure it is syntactically correct; the entries itself are decoded
484 * from nfs_readdir by calling the decode_entry function directly.
485 */
486static int
487nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
488 u64 cookie, struct page **pages, unsigned int count, int plus)
489{
490 struct inode *dir = d_inode(dentry);
491 struct nfs_readdirargs arg = {
492 .fh = NFS_FH(dir),
493 .cookie = cookie,
494 .count = count,
495 .pages = pages,
496 };
497 struct rpc_message msg = {
498 .rpc_proc = &nfs_procedures[NFSPROC_READDIR],
499 .rpc_argp = &arg,
500 .rpc_cred = cred,
501 };
502 int status;
503
504 dprintk("NFS call readdir %d\n", (unsigned int)cookie);
505 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
506
507 nfs_invalidate_atime(dir);
508
509 dprintk("NFS reply readdir: %d\n", status);
510 return status;
511}
512
513static int
514nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
515 struct nfs_fsstat *stat)
516{
517 struct nfs2_fsstat fsinfo;
518 struct rpc_message msg = {
519 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
520 .rpc_argp = fhandle,
521 .rpc_resp = &fsinfo,
522 };
523 int status;
524
525 dprintk("NFS call statfs\n");
526 nfs_fattr_init(stat->fattr);
527 status = rpc_call_sync(server->client, &msg, 0);
528 dprintk("NFS reply statfs: %d\n", status);
529 if (status)
530 goto out;
531 stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
532 stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
533 stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
534 stat->tfiles = 0;
535 stat->ffiles = 0;
536 stat->afiles = 0;
537out:
538 return status;
539}
540
541static int
542nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
543 struct nfs_fsinfo *info)
544{
545 struct nfs2_fsstat fsinfo;
546 struct rpc_message msg = {
547 .rpc_proc = &nfs_procedures[NFSPROC_STATFS],
548 .rpc_argp = fhandle,
549 .rpc_resp = &fsinfo,
550 };
551 int status;
552
553 dprintk("NFS call fsinfo\n");
554 nfs_fattr_init(info->fattr);
555 status = rpc_call_sync(server->client, &msg, 0);
556 dprintk("NFS reply fsinfo: %d\n", status);
557 if (status)
558 goto out;
559 info->rtmax = NFS_MAXDATA;
560 info->rtpref = fsinfo.tsize;
561 info->rtmult = fsinfo.bsize;
562 info->wtmax = NFS_MAXDATA;
563 info->wtpref = fsinfo.tsize;
564 info->wtmult = fsinfo.bsize;
565 info->dtpref = fsinfo.tsize;
566 info->maxfilesize = 0x7FFFFFFF;
567 info->lease_time = 0;
568out:
569 return status;
570}
571
572static int
573nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
574 struct nfs_pathconf *info)
575{
576 info->max_link = 0;
577 info->max_namelen = NFS2_MAXNAMLEN;
578 return 0;
579}
580
581static int nfs_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
582{
583 struct inode *inode = hdr->inode;
584
585 nfs_invalidate_atime(inode);
586 if (task->tk_status >= 0) {
587 nfs_refresh_inode(inode, hdr->res.fattr);
588 /* Emulate the eof flag, which isn't normally needed in NFSv2
589 * as it is guaranteed to always return the file attributes
590 */
591 if (hdr->args.offset + hdr->res.count >= hdr->res.fattr->size)
592 hdr->res.eof = 1;
593 }
594 return 0;
595}
596
597static void nfs_proc_read_setup(struct nfs_pgio_header *hdr,
598 struct rpc_message *msg)
599{
600 msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
601}
602
603static int nfs_proc_pgio_rpc_prepare(struct rpc_task *task,
604 struct nfs_pgio_header *hdr)
605{
606 rpc_call_start(task);
607 return 0;
608}
609
610static int nfs_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
611{
612 if (task->tk_status >= 0)
613 nfs_writeback_update_inode(hdr);
614 return 0;
615}
616
617static void nfs_proc_write_setup(struct nfs_pgio_header *hdr,
618 struct rpc_message *msg)
619{
620 /* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
621 hdr->args.stable = NFS_FILE_SYNC;
622 msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
623}
624
625static void nfs_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
626{
627 BUG();
628}
629
630static void
631nfs_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
632{
633 BUG();
634}
635
636static int
637nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
638{
639 struct inode *inode = file_inode(filp);
640
641 return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
642}
643
644/* Helper functions for NFS lock bounds checking */
645#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
646static int nfs_lock_check_bounds(const struct file_lock *fl)
647{
648 __s32 start, end;
649
650 start = (__s32)fl->fl_start;
651 if ((loff_t)start != fl->fl_start)
652 goto out_einval;
653
654 if (fl->fl_end != OFFSET_MAX) {
655 end = (__s32)fl->fl_end;
656 if ((loff_t)end != fl->fl_end)
657 goto out_einval;
658 } else
659 end = NFS_LOCK32_OFFSET_MAX;
660
661 if (start < 0 || start > end)
662 goto out_einval;
663 return 0;
664out_einval:
665 return -EINVAL;
666}
667
668static int nfs_have_delegation(struct inode *inode, fmode_t flags)
669{
670 return 0;
671}
672
673static int nfs_return_delegation(struct inode *inode)
674{
675 nfs_wb_all(inode);
676 return 0;
677}
678
679static const struct inode_operations nfs_dir_inode_operations = {
680 .create = nfs_create,
681 .lookup = nfs_lookup,
682 .link = nfs_link,
683 .unlink = nfs_unlink,
684 .symlink = nfs_symlink,
685 .mkdir = nfs_mkdir,
686 .rmdir = nfs_rmdir,
687 .mknod = nfs_mknod,
688 .rename = nfs_rename,
689 .permission = nfs_permission,
690 .getattr = nfs_getattr,
691 .setattr = nfs_setattr,
692};
693
694static const struct inode_operations nfs_file_inode_operations = {
695 .permission = nfs_permission,
696 .getattr = nfs_getattr,
697 .setattr = nfs_setattr,
698};
699
700const struct nfs_rpc_ops nfs_v2_clientops = {
701 .version = 2, /* protocol version */
702 .dentry_ops = &nfs_dentry_operations,
703 .dir_inode_ops = &nfs_dir_inode_operations,
704 .file_inode_ops = &nfs_file_inode_operations,
705 .file_ops = &nfs_file_operations,
706 .getroot = nfs_proc_get_root,
707 .submount = nfs_submount,
708 .try_mount = nfs_try_mount,
709 .getattr = nfs_proc_getattr,
710 .setattr = nfs_proc_setattr,
711 .lookup = nfs_proc_lookup,
712 .access = NULL, /* access */
713 .readlink = nfs_proc_readlink,
714 .create = nfs_proc_create,
715 .remove = nfs_proc_remove,
716 .unlink_setup = nfs_proc_unlink_setup,
717 .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
718 .unlink_done = nfs_proc_unlink_done,
719 .rename_setup = nfs_proc_rename_setup,
720 .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
721 .rename_done = nfs_proc_rename_done,
722 .link = nfs_proc_link,
723 .symlink = nfs_proc_symlink,
724 .mkdir = nfs_proc_mkdir,
725 .rmdir = nfs_proc_rmdir,
726 .readdir = nfs_proc_readdir,
727 .mknod = nfs_proc_mknod,
728 .statfs = nfs_proc_statfs,
729 .fsinfo = nfs_proc_fsinfo,
730 .pathconf = nfs_proc_pathconf,
731 .decode_dirent = nfs2_decode_dirent,
732 .pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare,
733 .read_setup = nfs_proc_read_setup,
734 .read_done = nfs_read_done,
735 .write_setup = nfs_proc_write_setup,
736 .write_done = nfs_write_done,
737 .commit_setup = nfs_proc_commit_setup,
738 .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
739 .lock = nfs_proc_lock,
740 .lock_check_bounds = nfs_lock_check_bounds,
741 .close_context = nfs_close_context,
742 .have_delegation = nfs_have_delegation,
743 .return_delegation = nfs_return_delegation,
744 .alloc_client = nfs_alloc_client,
745 .init_client = nfs_init_client,
746 .free_client = nfs_free_client,
747 .create_server = nfs_create_server,
748 .clone_server = nfs_clone_server,
749};
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 flags)
691{
692 return 0;
693}
694
695static const struct inode_operations nfs_dir_inode_operations = {
696 .create = nfs_create,
697 .lookup = nfs_lookup,
698 .link = nfs_link,
699 .unlink = nfs_unlink,
700 .symlink = nfs_symlink,
701 .mkdir = nfs_mkdir,
702 .rmdir = nfs_rmdir,
703 .mknod = nfs_mknod,
704 .rename = nfs_rename,
705 .permission = nfs_permission,
706 .getattr = nfs_getattr,
707 .setattr = nfs_setattr,
708};
709
710static const struct inode_operations nfs_file_inode_operations = {
711 .permission = nfs_permission,
712 .getattr = nfs_getattr,
713 .setattr = nfs_setattr,
714};
715
716const struct nfs_rpc_ops nfs_v2_clientops = {
717 .version = 2, /* protocol version */
718 .dentry_ops = &nfs_dentry_operations,
719 .dir_inode_ops = &nfs_dir_inode_operations,
720 .file_inode_ops = &nfs_file_inode_operations,
721 .file_ops = &nfs_file_operations,
722 .getroot = nfs_proc_get_root,
723 .submount = nfs_submount,
724 .try_get_tree = nfs_try_get_tree,
725 .getattr = nfs_proc_getattr,
726 .setattr = nfs_proc_setattr,
727 .lookup = nfs_proc_lookup,
728 .access = NULL, /* access */
729 .readlink = nfs_proc_readlink,
730 .create = nfs_proc_create,
731 .remove = nfs_proc_remove,
732 .unlink_setup = nfs_proc_unlink_setup,
733 .unlink_rpc_prepare = nfs_proc_unlink_rpc_prepare,
734 .unlink_done = nfs_proc_unlink_done,
735 .rename_setup = nfs_proc_rename_setup,
736 .rename_rpc_prepare = nfs_proc_rename_rpc_prepare,
737 .rename_done = nfs_proc_rename_done,
738 .link = nfs_proc_link,
739 .symlink = nfs_proc_symlink,
740 .mkdir = nfs_proc_mkdir,
741 .rmdir = nfs_proc_rmdir,
742 .readdir = nfs_proc_readdir,
743 .mknod = nfs_proc_mknod,
744 .statfs = nfs_proc_statfs,
745 .fsinfo = nfs_proc_fsinfo,
746 .pathconf = nfs_proc_pathconf,
747 .decode_dirent = nfs2_decode_dirent,
748 .pgio_rpc_prepare = nfs_proc_pgio_rpc_prepare,
749 .read_setup = nfs_proc_read_setup,
750 .read_done = nfs_read_done,
751 .write_setup = nfs_proc_write_setup,
752 .write_done = nfs_write_done,
753 .commit_setup = nfs_proc_commit_setup,
754 .commit_rpc_prepare = nfs_proc_commit_rpc_prepare,
755 .lock = nfs_proc_lock,
756 .lock_check_bounds = nfs_lock_check_bounds,
757 .close_context = nfs_close_context,
758 .have_delegation = nfs_have_delegation,
759 .alloc_client = nfs_alloc_client,
760 .init_client = nfs_init_client,
761 .free_client = nfs_free_client,
762 .create_server = nfs_create_server,
763 .clone_server = nfs_clone_server,
764};