1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/nfs/nfs3proc.c
4 *
5 * Client-side NFSv3 procedures stubs.
6 *
7 * Copyright (C) 1997, Olaf Kirch
8 */
9
10 #include <linux/mm.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/sunrpc/clnt.h>
14 #include <linux/slab.h>
15 #include <linux/nfs.h>
16 #include <linux/nfs3.h>
17 #include <linux/nfs_fs.h>
18 #include <linux/nfs_page.h>
19 #include <linux/lockd/bind.h>
20 #include <linux/nfs_mount.h>
21 #include <linux/freezer.h>
22 #include <linux/xattr.h>
23
24 #include "iostat.h"
25 #include "internal.h"
26 #include "nfs3_fs.h"
27
28 #define NFSDBG_FACILITY NFSDBG_PROC
29
30 /* A wrapper to handle the EJUKEBOX error messages */
31 static int
nfs3_rpc_wrapper(struct rpc_clnt * clnt,struct rpc_message * msg,int flags)32 nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
33 {
34 int res;
35 do {
36 res = rpc_call_sync(clnt, msg, flags);
37 if (res != -EJUKEBOX)
38 break;
39 freezable_schedule_timeout_killable_unsafe(NFS_JUKEBOX_RETRY_TIME);
40 res = -ERESTARTSYS;
41 } while (!fatal_signal_pending(current));
42 return res;
43 }
44
45 #define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
46
47 static int
nfs3_async_handle_jukebox(struct rpc_task * task,struct inode * inode)48 nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
49 {
50 if (task->tk_status != -EJUKEBOX)
51 return 0;
52 if (task->tk_status == -EJUKEBOX)
53 nfs_inc_stats(inode, NFSIOS_DELAY);
54 task->tk_status = 0;
55 rpc_restart_call(task);
56 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
57 return 1;
58 }
59
60 static int
do_proc_get_root(struct rpc_clnt * client,struct nfs_fh * fhandle,struct nfs_fsinfo * info)61 do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle,
62 struct nfs_fsinfo *info)
63 {
64 struct rpc_message msg = {
65 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
66 .rpc_argp = fhandle,
67 .rpc_resp = info,
68 };
69 int status;
70
71 dprintk("%s: call fsinfo\n", __func__);
72 nfs_fattr_init(info->fattr);
73 status = rpc_call_sync(client, &msg, 0);
74 dprintk("%s: reply fsinfo: %d\n", __func__, status);
75 if (status == 0 && !(info->fattr->valid & NFS_ATTR_FATTR)) {
76 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
77 msg.rpc_resp = info->fattr;
78 status = rpc_call_sync(client, &msg, 0);
79 dprintk("%s: reply getattr: %d\n", __func__, status);
80 }
81 return status;
82 }
83
84 /*
85 * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb
86 */
87 static int
nfs3_proc_get_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)88 nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
89 struct nfs_fsinfo *info)
90 {
91 int status;
92
93 status = do_proc_get_root(server->client, fhandle, info);
94 if (status && server->nfs_client->cl_rpcclient != server->client)
95 status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info);
96 return status;
97 }
98
99 /*
100 * One function for each procedure in the NFS protocol.
101 */
102 static int
nfs3_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct nfs4_label * label,struct inode * inode)103 nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
104 struct nfs_fattr *fattr, struct nfs4_label *label,
105 struct inode *inode)
106 {
107 struct rpc_message msg = {
108 .rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR],
109 .rpc_argp = fhandle,
110 .rpc_resp = fattr,
111 };
112 int status;
113
114 dprintk("NFS call getattr\n");
115 nfs_fattr_init(fattr);
116 status = rpc_call_sync(server->client, &msg, 0);
117 dprintk("NFS reply getattr: %d\n", status);
118 return status;
119 }
120
121 static int
nfs3_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)122 nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
123 struct iattr *sattr)
124 {
125 struct inode *inode = d_inode(dentry);
126 struct nfs3_sattrargs arg = {
127 .fh = NFS_FH(inode),
128 .sattr = sattr,
129 };
130 struct rpc_message msg = {
131 .rpc_proc = &nfs3_procedures[NFS3PROC_SETATTR],
132 .rpc_argp = &arg,
133 .rpc_resp = fattr,
134 };
135 int status;
136
137 dprintk("NFS call setattr\n");
138 if (sattr->ia_valid & ATTR_FILE)
139 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
140 nfs_fattr_init(fattr);
141 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
142 if (status == 0) {
143 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
144 nfs_zap_acl_cache(inode);
145 nfs_setattr_update_inode(inode, sattr, fattr);
146 }
147 dprintk("NFS reply setattr: %d\n", status);
148 return status;
149 }
150
151 static int
nfs3_proc_lookup(struct inode * dir,const struct qstr * name,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct nfs4_label * label)152 nfs3_proc_lookup(struct inode *dir, const struct qstr *name,
153 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
154 struct nfs4_label *label)
155 {
156 struct nfs3_diropargs arg = {
157 .fh = NFS_FH(dir),
158 .name = name->name,
159 .len = name->len
160 };
161 struct nfs3_diropres res = {
162 .fh = fhandle,
163 .fattr = fattr
164 };
165 struct rpc_message msg = {
166 .rpc_proc = &nfs3_procedures[NFS3PROC_LOOKUP],
167 .rpc_argp = &arg,
168 .rpc_resp = &res,
169 };
170 int status;
171
172 dprintk("NFS call lookup %s\n", name->name);
173 res.dir_attr = nfs_alloc_fattr();
174 if (res.dir_attr == NULL)
175 return -ENOMEM;
176
177 nfs_fattr_init(fattr);
178 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
179 nfs_refresh_inode(dir, res.dir_attr);
180 if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
181 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
182 msg.rpc_argp = fhandle;
183 msg.rpc_resp = fattr;
184 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
185 }
186 nfs_free_fattr(res.dir_attr);
187 dprintk("NFS reply lookup: %d\n", status);
188 return status;
189 }
190
nfs3_proc_access(struct inode * inode,struct nfs_access_entry * entry)191 static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
192 {
193 struct nfs3_accessargs arg = {
194 .fh = NFS_FH(inode),
195 .access = entry->mask,
196 };
197 struct nfs3_accessres res;
198 struct rpc_message msg = {
199 .rpc_proc = &nfs3_procedures[NFS3PROC_ACCESS],
200 .rpc_argp = &arg,
201 .rpc_resp = &res,
202 .rpc_cred = entry->cred,
203 };
204 int status = -ENOMEM;
205
206 dprintk("NFS call access\n");
207 res.fattr = nfs_alloc_fattr();
208 if (res.fattr == NULL)
209 goto out;
210
211 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
212 nfs_refresh_inode(inode, res.fattr);
213 if (status == 0)
214 nfs_access_set_mask(entry, res.access);
215 nfs_free_fattr(res.fattr);
216 out:
217 dprintk("NFS reply access: %d\n", status);
218 return status;
219 }
220
nfs3_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)221 static int nfs3_proc_readlink(struct inode *inode, struct page *page,
222 unsigned int pgbase, unsigned int pglen)
223 {
224 struct nfs_fattr *fattr;
225 struct nfs3_readlinkargs args = {
226 .fh = NFS_FH(inode),
227 .pgbase = pgbase,
228 .pglen = pglen,
229 .pages = &page
230 };
231 struct rpc_message msg = {
232 .rpc_proc = &nfs3_procedures[NFS3PROC_READLINK],
233 .rpc_argp = &args,
234 };
235 int status = -ENOMEM;
236
237 dprintk("NFS call readlink\n");
238 fattr = nfs_alloc_fattr();
239 if (fattr == NULL)
240 goto out;
241 msg.rpc_resp = fattr;
242
243 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
244 nfs_refresh_inode(inode, fattr);
245 nfs_free_fattr(fattr);
246 out:
247 dprintk("NFS reply readlink: %d\n", status);
248 return status;
249 }
250
251 struct nfs3_createdata {
252 struct rpc_message msg;
253 union {
254 struct nfs3_createargs create;
255 struct nfs3_mkdirargs mkdir;
256 struct nfs3_symlinkargs symlink;
257 struct nfs3_mknodargs mknod;
258 } arg;
259 struct nfs3_diropres res;
260 struct nfs_fh fh;
261 struct nfs_fattr fattr;
262 struct nfs_fattr dir_attr;
263 };
264
nfs3_alloc_createdata(void)265 static struct nfs3_createdata *nfs3_alloc_createdata(void)
266 {
267 struct nfs3_createdata *data;
268
269 data = kzalloc(sizeof(*data), GFP_KERNEL);
270 if (data != NULL) {
271 data->msg.rpc_argp = &data->arg;
272 data->msg.rpc_resp = &data->res;
273 data->res.fh = &data->fh;
274 data->res.fattr = &data->fattr;
275 data->res.dir_attr = &data->dir_attr;
276 nfs_fattr_init(data->res.fattr);
277 nfs_fattr_init(data->res.dir_attr);
278 }
279 return data;
280 }
281
282 static struct dentry *
nfs3_do_create(struct inode * dir,struct dentry * dentry,struct nfs3_createdata * data)283 nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
284 {
285 int status;
286
287 status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
288 nfs_post_op_update_inode(dir, data->res.dir_attr);
289 if (status != 0)
290 return ERR_PTR(status);
291
292 return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr, NULL);
293 }
294
nfs3_free_createdata(struct nfs3_createdata * data)295 static void nfs3_free_createdata(struct nfs3_createdata *data)
296 {
297 kfree(data);
298 }
299
300 /*
301 * Create a regular file.
302 */
303 static int
nfs3_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)304 nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
305 int flags)
306 {
307 struct posix_acl *default_acl, *acl;
308 struct nfs3_createdata *data;
309 struct dentry *d_alias;
310 int status = -ENOMEM;
311
312 dprintk("NFS call create %pd\n", dentry);
313
314 data = nfs3_alloc_createdata();
315 if (data == NULL)
316 goto out;
317
318 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
319 data->arg.create.fh = NFS_FH(dir);
320 data->arg.create.name = dentry->d_name.name;
321 data->arg.create.len = dentry->d_name.len;
322 data->arg.create.sattr = sattr;
323
324 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
325 if (flags & O_EXCL) {
326 data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE;
327 data->arg.create.verifier[0] = cpu_to_be32(jiffies);
328 data->arg.create.verifier[1] = cpu_to_be32(current->pid);
329 }
330
331 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
332 if (status)
333 goto out;
334
335 for (;;) {
336 d_alias = nfs3_do_create(dir, dentry, data);
337 status = PTR_ERR_OR_ZERO(d_alias);
338
339 if (status != -ENOTSUPP)
340 break;
341 /* If the server doesn't support the exclusive creation
342 * semantics, try again with simple 'guarded' mode. */
343 switch (data->arg.create.createmode) {
344 case NFS3_CREATE_EXCLUSIVE:
345 data->arg.create.createmode = NFS3_CREATE_GUARDED;
346 break;
347
348 case NFS3_CREATE_GUARDED:
349 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
350 break;
351
352 case NFS3_CREATE_UNCHECKED:
353 goto out;
354 }
355 nfs_fattr_init(data->res.dir_attr);
356 nfs_fattr_init(data->res.fattr);
357 }
358
359 if (status != 0)
360 goto out_release_acls;
361
362 if (d_alias)
363 dentry = d_alias;
364
365 /* When we created the file with exclusive semantics, make
366 * sure we set the attributes afterwards. */
367 if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
368 dprintk("NFS call setattr (post-create)\n");
369
370 if (!(sattr->ia_valid & ATTR_ATIME_SET))
371 sattr->ia_valid |= ATTR_ATIME;
372 if (!(sattr->ia_valid & ATTR_MTIME_SET))
373 sattr->ia_valid |= ATTR_MTIME;
374
375 /* Note: we could use a guarded setattr here, but I'm
376 * not sure this buys us anything (and I'd have
377 * to revamp the NFSv3 XDR code) */
378 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
379 nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
380 dprintk("NFS reply setattr (post-create): %d\n", status);
381 if (status != 0)
382 goto out_dput;
383 }
384
385 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
386
387 out_dput:
388 dput(d_alias);
389 out_release_acls:
390 posix_acl_release(acl);
391 posix_acl_release(default_acl);
392 out:
393 nfs3_free_createdata(data);
394 dprintk("NFS reply create: %d\n", status);
395 return status;
396 }
397
398 static int
nfs3_proc_remove(struct inode * dir,struct dentry * dentry)399 nfs3_proc_remove(struct inode *dir, struct dentry *dentry)
400 {
401 struct nfs_removeargs arg = {
402 .fh = NFS_FH(dir),
403 .name = dentry->d_name,
404 };
405 struct nfs_removeres res;
406 struct rpc_message msg = {
407 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
408 .rpc_argp = &arg,
409 .rpc_resp = &res,
410 };
411 int status = -ENOMEM;
412
413 dprintk("NFS call remove %pd2\n", dentry);
414 res.dir_attr = nfs_alloc_fattr();
415 if (res.dir_attr == NULL)
416 goto out;
417
418 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
419 nfs_post_op_update_inode(dir, res.dir_attr);
420 nfs_free_fattr(res.dir_attr);
421 out:
422 dprintk("NFS reply remove: %d\n", status);
423 return status;
424 }
425
426 static void
nfs3_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)427 nfs3_proc_unlink_setup(struct rpc_message *msg,
428 struct dentry *dentry,
429 struct inode *inode)
430 {
431 msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
432 }
433
nfs3_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)434 static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
435 {
436 rpc_call_start(task);
437 }
438
439 static int
nfs3_proc_unlink_done(struct rpc_task * task,struct inode * dir)440 nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
441 {
442 struct nfs_removeres *res;
443 if (nfs3_async_handle_jukebox(task, dir))
444 return 0;
445 res = task->tk_msg.rpc_resp;
446 nfs_post_op_update_inode(dir, res->dir_attr);
447 return 1;
448 }
449
450 static void
nfs3_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)451 nfs3_proc_rename_setup(struct rpc_message *msg,
452 struct dentry *old_dentry,
453 struct dentry *new_dentry)
454 {
455 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
456 }
457
nfs3_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)458 static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
459 {
460 rpc_call_start(task);
461 }
462
463 static int
nfs3_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)464 nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
465 struct inode *new_dir)
466 {
467 struct nfs_renameres *res;
468
469 if (nfs3_async_handle_jukebox(task, old_dir))
470 return 0;
471 res = task->tk_msg.rpc_resp;
472
473 nfs_post_op_update_inode(old_dir, res->old_fattr);
474 nfs_post_op_update_inode(new_dir, res->new_fattr);
475 return 1;
476 }
477
478 static int
nfs3_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)479 nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
480 {
481 struct nfs3_linkargs arg = {
482 .fromfh = NFS_FH(inode),
483 .tofh = NFS_FH(dir),
484 .toname = name->name,
485 .tolen = name->len
486 };
487 struct nfs3_linkres res;
488 struct rpc_message msg = {
489 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK],
490 .rpc_argp = &arg,
491 .rpc_resp = &res,
492 };
493 int status = -ENOMEM;
494
495 dprintk("NFS call link %s\n", name->name);
496 res.fattr = nfs_alloc_fattr();
497 res.dir_attr = nfs_alloc_fattr();
498 if (res.fattr == NULL || res.dir_attr == NULL)
499 goto out;
500
501 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
502 nfs_post_op_update_inode(dir, res.dir_attr);
503 nfs_post_op_update_inode(inode, res.fattr);
504 out:
505 nfs_free_fattr(res.dir_attr);
506 nfs_free_fattr(res.fattr);
507 dprintk("NFS reply link: %d\n", status);
508 return status;
509 }
510
511 static int
nfs3_proc_symlink(struct inode * dir,struct dentry * dentry,struct page * page,unsigned int len,struct iattr * sattr)512 nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
513 unsigned int len, struct iattr *sattr)
514 {
515 struct nfs3_createdata *data;
516 struct dentry *d_alias;
517 int status = -ENOMEM;
518
519 if (len > NFS3_MAXPATHLEN)
520 return -ENAMETOOLONG;
521
522 dprintk("NFS call symlink %pd\n", dentry);
523
524 data = nfs3_alloc_createdata();
525 if (data == NULL)
526 goto out;
527 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
528 data->arg.symlink.fromfh = NFS_FH(dir);
529 data->arg.symlink.fromname = dentry->d_name.name;
530 data->arg.symlink.fromlen = dentry->d_name.len;
531 data->arg.symlink.pages = &page;
532 data->arg.symlink.pathlen = len;
533 data->arg.symlink.sattr = sattr;
534
535 d_alias = nfs3_do_create(dir, dentry, data);
536 status = PTR_ERR_OR_ZERO(d_alias);
537
538 if (status == 0)
539 dput(d_alias);
540
541 nfs3_free_createdata(data);
542 out:
543 dprintk("NFS reply symlink: %d\n", status);
544 return status;
545 }
546
547 static int
nfs3_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)548 nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
549 {
550 struct posix_acl *default_acl, *acl;
551 struct nfs3_createdata *data;
552 struct dentry *d_alias;
553 int status = -ENOMEM;
554
555 dprintk("NFS call mkdir %pd\n", dentry);
556
557 data = nfs3_alloc_createdata();
558 if (data == NULL)
559 goto out;
560
561 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
562 if (status)
563 goto out;
564
565 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
566 data->arg.mkdir.fh = NFS_FH(dir);
567 data->arg.mkdir.name = dentry->d_name.name;
568 data->arg.mkdir.len = dentry->d_name.len;
569 data->arg.mkdir.sattr = sattr;
570
571 d_alias = nfs3_do_create(dir, dentry, data);
572 status = PTR_ERR_OR_ZERO(d_alias);
573
574 if (status != 0)
575 goto out_release_acls;
576
577 if (d_alias)
578 dentry = d_alias;
579
580 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
581
582 dput(d_alias);
583 out_release_acls:
584 posix_acl_release(acl);
585 posix_acl_release(default_acl);
586 out:
587 nfs3_free_createdata(data);
588 dprintk("NFS reply mkdir: %d\n", status);
589 return status;
590 }
591
592 static int
nfs3_proc_rmdir(struct inode * dir,const struct qstr * name)593 nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
594 {
595 struct nfs_fattr *dir_attr;
596 struct nfs3_diropargs arg = {
597 .fh = NFS_FH(dir),
598 .name = name->name,
599 .len = name->len
600 };
601 struct rpc_message msg = {
602 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
603 .rpc_argp = &arg,
604 };
605 int status = -ENOMEM;
606
607 dprintk("NFS call rmdir %s\n", name->name);
608 dir_attr = nfs_alloc_fattr();
609 if (dir_attr == NULL)
610 goto out;
611
612 msg.rpc_resp = dir_attr;
613 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
614 nfs_post_op_update_inode(dir, dir_attr);
615 nfs_free_fattr(dir_attr);
616 out:
617 dprintk("NFS reply rmdir: %d\n", status);
618 return status;
619 }
620
621 /*
622 * The READDIR implementation is somewhat hackish - we pass the user buffer
623 * to the encode function, which installs it in the receive iovec.
624 * The decode function itself doesn't perform any decoding, it just makes
625 * sure the reply is syntactically correct.
626 *
627 * Also note that this implementation handles both plain readdir and
628 * readdirplus.
629 */
630 static int
nfs3_proc_readdir(struct dentry * dentry,const struct cred * cred,u64 cookie,struct page ** pages,unsigned int count,bool plus)631 nfs3_proc_readdir(struct dentry *dentry, const struct cred *cred,
632 u64 cookie, struct page **pages, unsigned int count, bool plus)
633 {
634 struct inode *dir = d_inode(dentry);
635 __be32 *verf = NFS_I(dir)->cookieverf;
636 struct nfs3_readdirargs arg = {
637 .fh = NFS_FH(dir),
638 .cookie = cookie,
639 .verf = {verf[0], verf[1]},
640 .plus = plus,
641 .count = count,
642 .pages = pages
643 };
644 struct nfs3_readdirres res = {
645 .verf = verf,
646 .plus = plus
647 };
648 struct rpc_message msg = {
649 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
650 .rpc_argp = &arg,
651 .rpc_resp = &res,
652 .rpc_cred = cred,
653 };
654 int status = -ENOMEM;
655
656 if (plus)
657 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
658
659 dprintk("NFS call readdir%s %d\n",
660 plus? "plus" : "", (unsigned int) cookie);
661
662 res.dir_attr = nfs_alloc_fattr();
663 if (res.dir_attr == NULL)
664 goto out;
665
666 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
667
668 nfs_invalidate_atime(dir);
669 nfs_refresh_inode(dir, res.dir_attr);
670
671 nfs_free_fattr(res.dir_attr);
672 out:
673 dprintk("NFS reply readdir%s: %d\n",
674 plus? "plus" : "", status);
675 return status;
676 }
677
678 static int
nfs3_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)679 nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
680 dev_t rdev)
681 {
682 struct posix_acl *default_acl, *acl;
683 struct nfs3_createdata *data;
684 struct dentry *d_alias;
685 int status = -ENOMEM;
686
687 dprintk("NFS call mknod %pd %u:%u\n", dentry,
688 MAJOR(rdev), MINOR(rdev));
689
690 data = nfs3_alloc_createdata();
691 if (data == NULL)
692 goto out;
693
694 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
695 if (status)
696 goto out;
697
698 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
699 data->arg.mknod.fh = NFS_FH(dir);
700 data->arg.mknod.name = dentry->d_name.name;
701 data->arg.mknod.len = dentry->d_name.len;
702 data->arg.mknod.sattr = sattr;
703 data->arg.mknod.rdev = rdev;
704
705 switch (sattr->ia_mode & S_IFMT) {
706 case S_IFBLK:
707 data->arg.mknod.type = NF3BLK;
708 break;
709 case S_IFCHR:
710 data->arg.mknod.type = NF3CHR;
711 break;
712 case S_IFIFO:
713 data->arg.mknod.type = NF3FIFO;
714 break;
715 case S_IFSOCK:
716 data->arg.mknod.type = NF3SOCK;
717 break;
718 default:
719 status = -EINVAL;
720 goto out;
721 }
722
723 d_alias = nfs3_do_create(dir, dentry, data);
724 status = PTR_ERR_OR_ZERO(d_alias);
725 if (status != 0)
726 goto out_release_acls;
727
728 if (d_alias)
729 dentry = d_alias;
730
731 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
732
733 dput(d_alias);
734 out_release_acls:
735 posix_acl_release(acl);
736 posix_acl_release(default_acl);
737 out:
738 nfs3_free_createdata(data);
739 dprintk("NFS reply mknod: %d\n", status);
740 return status;
741 }
742
743 static int
nfs3_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * stat)744 nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
745 struct nfs_fsstat *stat)
746 {
747 struct rpc_message msg = {
748 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
749 .rpc_argp = fhandle,
750 .rpc_resp = stat,
751 };
752 int status;
753
754 dprintk("NFS call fsstat\n");
755 nfs_fattr_init(stat->fattr);
756 status = rpc_call_sync(server->client, &msg, 0);
757 dprintk("NFS reply fsstat: %d\n", status);
758 return status;
759 }
760
761 static int
do_proc_fsinfo(struct rpc_clnt * client,struct nfs_fh * fhandle,struct nfs_fsinfo * info)762 do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
763 struct nfs_fsinfo *info)
764 {
765 struct rpc_message msg = {
766 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
767 .rpc_argp = fhandle,
768 .rpc_resp = info,
769 };
770 int status;
771
772 dprintk("NFS call fsinfo\n");
773 nfs_fattr_init(info->fattr);
774 status = rpc_call_sync(client, &msg, 0);
775 dprintk("NFS reply fsinfo: %d\n", status);
776 return status;
777 }
778
779 /*
780 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
781 * nfs_create_server
782 */
783 static int
nfs3_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)784 nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
785 struct nfs_fsinfo *info)
786 {
787 int status;
788
789 status = do_proc_fsinfo(server->client, fhandle, info);
790 if (status && server->nfs_client->cl_rpcclient != server->client)
791 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
792 return status;
793 }
794
795 static int
nfs3_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * info)796 nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
797 struct nfs_pathconf *info)
798 {
799 struct rpc_message msg = {
800 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
801 .rpc_argp = fhandle,
802 .rpc_resp = info,
803 };
804 int status;
805
806 dprintk("NFS call pathconf\n");
807 nfs_fattr_init(info->fattr);
808 status = rpc_call_sync(server->client, &msg, 0);
809 dprintk("NFS reply pathconf: %d\n", status);
810 return status;
811 }
812
nfs3_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)813 static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
814 {
815 struct inode *inode = hdr->inode;
816 struct nfs_server *server = NFS_SERVER(inode);
817
818 if (hdr->pgio_done_cb != NULL)
819 return hdr->pgio_done_cb(task, hdr);
820
821 if (nfs3_async_handle_jukebox(task, inode))
822 return -EAGAIN;
823
824 if (task->tk_status >= 0 && !server->read_hdrsize)
825 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
826
827 nfs_invalidate_atime(inode);
828 nfs_refresh_inode(inode, &hdr->fattr);
829 return 0;
830 }
831
nfs3_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)832 static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
833 struct rpc_message *msg)
834 {
835 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
836 hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
837 }
838
nfs3_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)839 static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
840 struct nfs_pgio_header *hdr)
841 {
842 rpc_call_start(task);
843 return 0;
844 }
845
nfs3_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)846 static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
847 {
848 struct inode *inode = hdr->inode;
849
850 if (hdr->pgio_done_cb != NULL)
851 return hdr->pgio_done_cb(task, hdr);
852
853 if (nfs3_async_handle_jukebox(task, inode))
854 return -EAGAIN;
855 if (task->tk_status >= 0)
856 nfs_writeback_update_inode(hdr);
857 return 0;
858 }
859
nfs3_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)860 static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
861 struct rpc_message *msg,
862 struct rpc_clnt **clnt)
863 {
864 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
865 }
866
nfs3_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)867 static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
868 {
869 rpc_call_start(task);
870 }
871
nfs3_commit_done(struct rpc_task * task,struct nfs_commit_data * data)872 static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
873 {
874 if (data->commit_done_cb != NULL)
875 return data->commit_done_cb(task, data);
876
877 if (nfs3_async_handle_jukebox(task, data->inode))
878 return -EAGAIN;
879 nfs_refresh_inode(data->inode, data->res.fattr);
880 return 0;
881 }
882
nfs3_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)883 static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
884 struct rpc_clnt **clnt)
885 {
886 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
887 }
888
nfs3_nlm_alloc_call(void * data)889 static void nfs3_nlm_alloc_call(void *data)
890 {
891 struct nfs_lock_context *l_ctx = data;
892 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
893 get_nfs_open_context(l_ctx->open_context);
894 nfs_get_lock_context(l_ctx->open_context);
895 }
896 }
897
nfs3_nlm_unlock_prepare(struct rpc_task * task,void * data)898 static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
899 {
900 struct nfs_lock_context *l_ctx = data;
901 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
902 return nfs_async_iocounter_wait(task, l_ctx);
903 return false;
904
905 }
906
nfs3_nlm_release_call(void * data)907 static void nfs3_nlm_release_call(void *data)
908 {
909 struct nfs_lock_context *l_ctx = data;
910 struct nfs_open_context *ctx;
911 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
912 ctx = l_ctx->open_context;
913 nfs_put_lock_context(l_ctx);
914 put_nfs_open_context(ctx);
915 }
916 }
917
918 static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
919 .nlmclnt_alloc_call = nfs3_nlm_alloc_call,
920 .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
921 .nlmclnt_release_call = nfs3_nlm_release_call,
922 };
923
924 static int
nfs3_proc_lock(struct file * filp,int cmd,struct file_lock * fl)925 nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
926 {
927 struct inode *inode = file_inode(filp);
928 struct nfs_lock_context *l_ctx = NULL;
929 struct nfs_open_context *ctx = nfs_file_open_context(filp);
930 int status;
931
932 if (fl->fl_flags & FL_CLOSE) {
933 l_ctx = nfs_get_lock_context(ctx);
934 if (IS_ERR(l_ctx))
935 l_ctx = NULL;
936 else
937 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
938 }
939
940 status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
941
942 if (l_ctx)
943 nfs_put_lock_context(l_ctx);
944
945 return status;
946 }
947
nfs3_have_delegation(struct inode * inode,fmode_t flags)948 static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
949 {
950 return 0;
951 }
952
953 static const struct inode_operations nfs3_dir_inode_operations = {
954 .create = nfs_create,
955 .lookup = nfs_lookup,
956 .link = nfs_link,
957 .unlink = nfs_unlink,
958 .symlink = nfs_symlink,
959 .mkdir = nfs_mkdir,
960 .rmdir = nfs_rmdir,
961 .mknod = nfs_mknod,
962 .rename = nfs_rename,
963 .permission = nfs_permission,
964 .getattr = nfs_getattr,
965 .setattr = nfs_setattr,
966 #ifdef CONFIG_NFS_V3_ACL
967 .listxattr = nfs3_listxattr,
968 .get_acl = nfs3_get_acl,
969 .set_acl = nfs3_set_acl,
970 #endif
971 };
972
973 static const struct inode_operations nfs3_file_inode_operations = {
974 .permission = nfs_permission,
975 .getattr = nfs_getattr,
976 .setattr = nfs_setattr,
977 #ifdef CONFIG_NFS_V3_ACL
978 .listxattr = nfs3_listxattr,
979 .get_acl = nfs3_get_acl,
980 .set_acl = nfs3_set_acl,
981 #endif
982 };
983
984 const struct nfs_rpc_ops nfs_v3_clientops = {
985 .version = 3, /* protocol version */
986 .dentry_ops = &nfs_dentry_operations,
987 .dir_inode_ops = &nfs3_dir_inode_operations,
988 .file_inode_ops = &nfs3_file_inode_operations,
989 .file_ops = &nfs_file_operations,
990 .nlmclnt_ops = &nlmclnt_fl_close_lock_ops,
991 .getroot = nfs3_proc_get_root,
992 .submount = nfs_submount,
993 .try_mount = nfs_try_mount,
994 .getattr = nfs3_proc_getattr,
995 .setattr = nfs3_proc_setattr,
996 .lookup = nfs3_proc_lookup,
997 .access = nfs3_proc_access,
998 .readlink = nfs3_proc_readlink,
999 .create = nfs3_proc_create,
1000 .remove = nfs3_proc_remove,
1001 .unlink_setup = nfs3_proc_unlink_setup,
1002 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1003 .unlink_done = nfs3_proc_unlink_done,
1004 .rename_setup = nfs3_proc_rename_setup,
1005 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1006 .rename_done = nfs3_proc_rename_done,
1007 .link = nfs3_proc_link,
1008 .symlink = nfs3_proc_symlink,
1009 .mkdir = nfs3_proc_mkdir,
1010 .rmdir = nfs3_proc_rmdir,
1011 .readdir = nfs3_proc_readdir,
1012 .mknod = nfs3_proc_mknod,
1013 .statfs = nfs3_proc_statfs,
1014 .fsinfo = nfs3_proc_fsinfo,
1015 .pathconf = nfs3_proc_pathconf,
1016 .decode_dirent = nfs3_decode_dirent,
1017 .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1018 .read_setup = nfs3_proc_read_setup,
1019 .read_done = nfs3_read_done,
1020 .write_setup = nfs3_proc_write_setup,
1021 .write_done = nfs3_write_done,
1022 .commit_setup = nfs3_proc_commit_setup,
1023 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1024 .commit_done = nfs3_commit_done,
1025 .lock = nfs3_proc_lock,
1026 .clear_acl_cache = forget_all_cached_acls,
1027 .close_context = nfs_close_context,
1028 .have_delegation = nfs3_have_delegation,
1029 .alloc_client = nfs_alloc_client,
1030 .init_client = nfs_init_client,
1031 .free_client = nfs_free_client,
1032 .create_server = nfs3_create_server,
1033 .clone_server = nfs3_clone_server,
1034 };
1035