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 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
40 schedule_timeout(NFS_JUKEBOX_RETRY_TIME);
41 res = -ERESTARTSYS;
42 } while (!fatal_signal_pending(current) && !nfs_current_task_exiting());
43 return res;
44 }
45
46 #define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)
47
48 static int
nfs3_async_handle_jukebox(struct rpc_task * task,struct inode * inode)49 nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
50 {
51 if (task->tk_status != -EJUKEBOX)
52 return 0;
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 inode * inode)103 nfs3_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 = &nfs3_procedures[NFS3PROC_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
nfs3_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)126 nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
127 struct iattr *sattr)
128 {
129 struct inode *inode = d_inode(dentry);
130 struct nfs3_sattrargs arg = {
131 .fh = NFS_FH(inode),
132 .sattr = sattr,
133 };
134 struct rpc_message msg = {
135 .rpc_proc = &nfs3_procedures[NFS3PROC_SETATTR],
136 .rpc_argp = &arg,
137 .rpc_resp = fattr,
138 };
139 int status;
140
141 dprintk("NFS call setattr\n");
142 if (sattr->ia_valid & ATTR_FILE)
143 msg.rpc_cred = nfs_file_cred(sattr->ia_file);
144 nfs_fattr_init(fattr);
145 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
146 if (status == 0) {
147 nfs_setattr_update_inode(inode, sattr, fattr);
148 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
149 nfs_zap_acl_cache(inode);
150 }
151 dprintk("NFS reply setattr: %d\n", status);
152 return status;
153 }
154
155 static int
__nfs3_proc_lookup(struct inode * dir,const char * name,size_t len,struct nfs_fh * fhandle,struct nfs_fattr * fattr,unsigned short task_flags)156 __nfs3_proc_lookup(struct inode *dir, const char *name, size_t len,
157 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
158 unsigned short task_flags)
159 {
160 struct nfs3_diropargs arg = {
161 .fh = NFS_FH(dir),
162 .name = name,
163 .len = len
164 };
165 struct nfs3_diropres res = {
166 .fh = fhandle,
167 .fattr = fattr
168 };
169 struct rpc_message msg = {
170 .rpc_proc = &nfs3_procedures[NFS3PROC_LOOKUP],
171 .rpc_argp = &arg,
172 .rpc_resp = &res,
173 };
174 int status;
175
176 res.dir_attr = nfs_alloc_fattr();
177 if (res.dir_attr == NULL)
178 return -ENOMEM;
179
180 nfs_fattr_init(fattr);
181 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
182 nfs_refresh_inode(dir, res.dir_attr);
183 if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
184 msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
185 msg.rpc_argp = fhandle;
186 msg.rpc_resp = fattr;
187 status = rpc_call_sync(NFS_CLIENT(dir), &msg, task_flags);
188 }
189 nfs_free_fattr(res.dir_attr);
190 dprintk("NFS reply lookup: %d\n", status);
191 return status;
192 }
193
194 static int
nfs3_proc_lookup(struct inode * dir,struct dentry * dentry,const struct qstr * name,struct nfs_fh * fhandle,struct nfs_fattr * fattr)195 nfs3_proc_lookup(struct inode *dir, struct dentry *dentry, const struct qstr *name,
196 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
197 {
198 unsigned short task_flags = 0;
199
200 /* Is this is an attribute revalidation, subject to softreval? */
201 if (nfs_lookup_is_soft_revalidate(dentry))
202 task_flags |= RPC_TASK_TIMEOUT;
203
204 dprintk("NFS call lookup %pd2\n", dentry);
205 return __nfs3_proc_lookup(dir, name->name, name->len, fhandle, fattr,
206 task_flags);
207 }
208
nfs3_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)209 static int nfs3_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
210 struct nfs_fattr *fattr)
211 {
212 const char dotdot[] = "..";
213 const size_t len = strlen(dotdot);
214 unsigned short task_flags = 0;
215
216 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
217 task_flags |= RPC_TASK_TIMEOUT;
218
219 return __nfs3_proc_lookup(inode, dotdot, len, fhandle, fattr,
220 task_flags);
221 }
222
nfs3_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)223 static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry,
224 const struct cred *cred)
225 {
226 struct nfs3_accessargs arg = {
227 .fh = NFS_FH(inode),
228 .access = entry->mask,
229 };
230 struct nfs3_accessres res;
231 struct rpc_message msg = {
232 .rpc_proc = &nfs3_procedures[NFS3PROC_ACCESS],
233 .rpc_argp = &arg,
234 .rpc_resp = &res,
235 .rpc_cred = cred,
236 };
237 int status = -ENOMEM;
238
239 dprintk("NFS call access\n");
240 res.fattr = nfs_alloc_fattr();
241 if (res.fattr == NULL)
242 goto out;
243
244 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
245 nfs_refresh_inode(inode, res.fattr);
246 if (status == 0)
247 nfs_access_set_mask(entry, res.access);
248 nfs_free_fattr(res.fattr);
249 out:
250 dprintk("NFS reply access: %d\n", status);
251 return status;
252 }
253
nfs3_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)254 static int nfs3_proc_readlink(struct inode *inode, struct page *page,
255 unsigned int pgbase, unsigned int pglen)
256 {
257 struct nfs_fattr *fattr;
258 struct nfs3_readlinkargs args = {
259 .fh = NFS_FH(inode),
260 .pgbase = pgbase,
261 .pglen = pglen,
262 .pages = &page
263 };
264 struct rpc_message msg = {
265 .rpc_proc = &nfs3_procedures[NFS3PROC_READLINK],
266 .rpc_argp = &args,
267 };
268 int status = -ENOMEM;
269
270 dprintk("NFS call readlink\n");
271 fattr = nfs_alloc_fattr();
272 if (fattr == NULL)
273 goto out;
274 msg.rpc_resp = fattr;
275
276 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
277 nfs_refresh_inode(inode, fattr);
278 nfs_free_fattr(fattr);
279 out:
280 dprintk("NFS reply readlink: %d\n", status);
281 return status;
282 }
283
284 struct nfs3_createdata {
285 struct rpc_message msg;
286 union {
287 struct nfs3_createargs create;
288 struct nfs3_mkdirargs mkdir;
289 struct nfs3_symlinkargs symlink;
290 struct nfs3_mknodargs mknod;
291 } arg;
292 struct nfs3_diropres res;
293 struct nfs_fh fh;
294 struct nfs_fattr fattr;
295 struct nfs_fattr dir_attr;
296 };
297
nfs3_alloc_createdata(void)298 static struct nfs3_createdata *nfs3_alloc_createdata(void)
299 {
300 struct nfs3_createdata *data;
301
302 data = kzalloc_obj(*data);
303 if (data != NULL) {
304 data->msg.rpc_argp = &data->arg;
305 data->msg.rpc_resp = &data->res;
306 data->res.fh = &data->fh;
307 data->res.fattr = &data->fattr;
308 data->res.dir_attr = &data->dir_attr;
309 nfs_fattr_init(data->res.fattr);
310 nfs_fattr_init(data->res.dir_attr);
311 }
312 return data;
313 }
314
315 static struct dentry *
nfs3_do_create(struct inode * dir,struct dentry * dentry,struct nfs3_createdata * data)316 nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
317 {
318 int status;
319
320 status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
321 nfs_post_op_update_inode(dir, data->res.dir_attr);
322 if (status != 0)
323 return ERR_PTR(status);
324
325 return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr);
326 }
327
nfs3_free_createdata(struct nfs3_createdata * data)328 static void nfs3_free_createdata(struct nfs3_createdata *data)
329 {
330 kfree(data);
331 }
332
333 /*
334 * Create a regular file.
335 */
336 static int
nfs3_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)337 nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
338 int flags)
339 {
340 struct posix_acl *default_acl, *acl;
341 struct nfs3_createdata *data;
342 struct dentry *d_alias;
343 int status = -ENOMEM;
344
345 dprintk("NFS call create %pd\n", dentry);
346
347 data = nfs3_alloc_createdata();
348 if (data == NULL)
349 goto out;
350
351 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
352 data->arg.create.fh = NFS_FH(dir);
353 data->arg.create.name = dentry->d_name.name;
354 data->arg.create.len = dentry->d_name.len;
355 data->arg.create.sattr = sattr;
356
357 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
358 if (flags & O_EXCL) {
359 data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE;
360 data->arg.create.verifier[0] = cpu_to_be32(jiffies);
361 data->arg.create.verifier[1] = cpu_to_be32(current->pid);
362 }
363
364 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
365 if (status)
366 goto out;
367
368 for (;;) {
369 d_alias = nfs3_do_create(dir, dentry, data);
370 status = PTR_ERR_OR_ZERO(d_alias);
371
372 if (status != -ENOTSUPP)
373 break;
374 /* If the server doesn't support the exclusive creation
375 * semantics, try again with simple 'guarded' mode. */
376 switch (data->arg.create.createmode) {
377 case NFS3_CREATE_EXCLUSIVE:
378 data->arg.create.createmode = NFS3_CREATE_GUARDED;
379 break;
380
381 case NFS3_CREATE_GUARDED:
382 data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
383 break;
384
385 case NFS3_CREATE_UNCHECKED:
386 goto out_release_acls;
387 }
388 nfs_fattr_init(data->res.dir_attr);
389 nfs_fattr_init(data->res.fattr);
390 }
391
392 if (status != 0)
393 goto out_release_acls;
394
395 if (d_alias) {
396 if (d_is_dir(d_alias)) {
397 status = -EISDIR;
398 goto out_dput;
399 }
400 dentry = d_alias;
401 }
402
403 /* When we created the file with exclusive semantics, make
404 * sure we set the attributes afterwards. */
405 if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
406 dprintk("NFS call setattr (post-create)\n");
407
408 if (!(sattr->ia_valid & ATTR_ATIME_SET))
409 sattr->ia_valid |= ATTR_ATIME;
410 if (!(sattr->ia_valid & ATTR_MTIME_SET))
411 sattr->ia_valid |= ATTR_MTIME;
412
413 /* Note: we could use a guarded setattr here, but I'm
414 * not sure this buys us anything (and I'd have
415 * to revamp the NFSv3 XDR code) */
416 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
417 nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
418 dprintk("NFS reply setattr (post-create): %d\n", status);
419 if (status != 0)
420 goto out_dput;
421 }
422
423 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
424
425 out_dput:
426 dput(d_alias);
427 out_release_acls:
428 posix_acl_release(acl);
429 posix_acl_release(default_acl);
430 out:
431 nfs3_free_createdata(data);
432 dprintk("NFS reply create: %d\n", status);
433 return status;
434 }
435
436 static int
nfs3_proc_remove(struct inode * dir,struct dentry * dentry)437 nfs3_proc_remove(struct inode *dir, struct dentry *dentry)
438 {
439 struct nfs_removeargs arg = {
440 .fh = NFS_FH(dir),
441 .name = dentry->d_name,
442 };
443 struct nfs_removeres res;
444 struct rpc_message msg = {
445 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
446 .rpc_argp = &arg,
447 .rpc_resp = &res,
448 };
449 int status = -ENOMEM;
450
451 dprintk("NFS call remove %pd2\n", dentry);
452 res.dir_attr = nfs_alloc_fattr();
453 if (res.dir_attr == NULL)
454 goto out;
455
456 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
457 nfs_post_op_update_inode(dir, res.dir_attr);
458 nfs_free_fattr(res.dir_attr);
459 out:
460 dprintk("NFS reply remove: %d\n", status);
461 return status;
462 }
463
464 static void
nfs3_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)465 nfs3_proc_unlink_setup(struct rpc_message *msg,
466 struct dentry *dentry,
467 struct inode *inode)
468 {
469 msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
470 }
471
nfs3_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)472 static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
473 {
474 rpc_call_start(task);
475 }
476
477 static int
nfs3_proc_unlink_done(struct rpc_task * task,struct inode * dir)478 nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
479 {
480 struct nfs_removeres *res;
481 if (nfs3_async_handle_jukebox(task, dir))
482 return 0;
483 res = task->tk_msg.rpc_resp;
484 nfs_post_op_update_inode(dir, res->dir_attr);
485 return 1;
486 }
487
488 static void
nfs3_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry,struct inode * same_parent)489 nfs3_proc_rename_setup(struct rpc_message *msg,
490 struct dentry *old_dentry,
491 struct dentry *new_dentry,
492 struct inode *same_parent)
493 {
494 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
495 }
496
nfs3_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)497 static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
498 {
499 rpc_call_start(task);
500 }
501
502 static int
nfs3_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)503 nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
504 struct inode *new_dir)
505 {
506 struct nfs_renameres *res;
507
508 if (nfs3_async_handle_jukebox(task, old_dir))
509 return 0;
510 res = task->tk_msg.rpc_resp;
511
512 nfs_post_op_update_inode(old_dir, res->old_fattr);
513 nfs_post_op_update_inode(new_dir, res->new_fattr);
514 return 1;
515 }
516
517 static int
nfs3_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)518 nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
519 {
520 struct nfs3_linkargs arg = {
521 .fromfh = NFS_FH(inode),
522 .tofh = NFS_FH(dir),
523 .toname = name->name,
524 .tolen = name->len
525 };
526 struct nfs3_linkres res;
527 struct rpc_message msg = {
528 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK],
529 .rpc_argp = &arg,
530 .rpc_resp = &res,
531 };
532 int status = -ENOMEM;
533
534 dprintk("NFS call link %s\n", name->name);
535 res.fattr = nfs_alloc_fattr();
536 res.dir_attr = nfs_alloc_fattr();
537 if (res.fattr == NULL || res.dir_attr == NULL)
538 goto out;
539
540 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
541 nfs_post_op_update_inode(dir, res.dir_attr);
542 nfs_post_op_update_inode(inode, res.fattr);
543 out:
544 nfs_free_fattr(res.dir_attr);
545 nfs_free_fattr(res.fattr);
546 dprintk("NFS reply link: %d\n", status);
547 return status;
548 }
549
550 static int
nfs3_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr)551 nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct folio *folio,
552 unsigned int len, struct iattr *sattr)
553 {
554 struct page *page = &folio->page;
555 struct nfs3_createdata *data;
556 struct dentry *d_alias;
557 int status = -ENOMEM;
558
559 if (len > NFS3_MAXPATHLEN)
560 return -ENAMETOOLONG;
561
562 dprintk("NFS call symlink %pd\n", dentry);
563
564 data = nfs3_alloc_createdata();
565 if (data == NULL)
566 goto out;
567 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
568 data->arg.symlink.fromfh = NFS_FH(dir);
569 data->arg.symlink.fromname = dentry->d_name.name;
570 data->arg.symlink.fromlen = dentry->d_name.len;
571 data->arg.symlink.pages = &page;
572 data->arg.symlink.pathlen = len;
573 data->arg.symlink.sattr = sattr;
574
575 d_alias = nfs3_do_create(dir, dentry, data);
576 status = PTR_ERR_OR_ZERO(d_alias);
577
578 if (status == 0)
579 dput(d_alias);
580
581 nfs3_free_createdata(data);
582 out:
583 dprintk("NFS reply symlink: %d\n", status);
584 return status;
585 }
586
587 static struct dentry *
nfs3_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)588 nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
589 {
590 struct posix_acl *default_acl, *acl;
591 struct nfs3_createdata *data;
592 struct dentry *ret = ERR_PTR(-ENOMEM);
593 int status;
594
595 dprintk("NFS call mkdir %pd\n", dentry);
596
597 data = nfs3_alloc_createdata();
598 if (data == NULL)
599 goto out;
600
601 ret = ERR_PTR(posix_acl_create(dir, &sattr->ia_mode,
602 &default_acl, &acl));
603 if (IS_ERR(ret))
604 goto out;
605
606 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
607 data->arg.mkdir.fh = NFS_FH(dir);
608 data->arg.mkdir.name = dentry->d_name.name;
609 data->arg.mkdir.len = dentry->d_name.len;
610 data->arg.mkdir.sattr = sattr;
611
612 ret = nfs3_do_create(dir, dentry, data);
613
614 if (IS_ERR(ret))
615 goto out_release_acls;
616
617 if (ret)
618 dentry = ret;
619
620 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
621 if (status) {
622 dput(ret);
623 ret = ERR_PTR(status);
624 }
625
626 out_release_acls:
627 posix_acl_release(acl);
628 posix_acl_release(default_acl);
629 out:
630 nfs3_free_createdata(data);
631 dprintk("NFS reply mkdir: %d\n", PTR_ERR_OR_ZERO(ret));
632 return ret;
633 }
634
635 static int
nfs3_proc_rmdir(struct inode * dir,const struct qstr * name)636 nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
637 {
638 struct nfs_fattr *dir_attr;
639 struct nfs3_diropargs arg = {
640 .fh = NFS_FH(dir),
641 .name = name->name,
642 .len = name->len
643 };
644 struct rpc_message msg = {
645 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
646 .rpc_argp = &arg,
647 };
648 int status = -ENOMEM;
649
650 dprintk("NFS call rmdir %s\n", name->name);
651 dir_attr = nfs_alloc_fattr();
652 if (dir_attr == NULL)
653 goto out;
654
655 msg.rpc_resp = dir_attr;
656 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
657 nfs_post_op_update_inode(dir, dir_attr);
658 nfs_free_fattr(dir_attr);
659 out:
660 dprintk("NFS reply rmdir: %d\n", status);
661 return status;
662 }
663
664 /*
665 * The READDIR implementation is somewhat hackish - we pass the user buffer
666 * to the encode function, which installs it in the receive iovec.
667 * The decode function itself doesn't perform any decoding, it just makes
668 * sure the reply is syntactically correct.
669 *
670 * Also note that this implementation handles both plain readdir and
671 * readdirplus.
672 */
nfs3_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)673 static int nfs3_proc_readdir(struct nfs_readdir_arg *nr_arg,
674 struct nfs_readdir_res *nr_res)
675 {
676 struct inode *dir = d_inode(nr_arg->dentry);
677 struct nfs3_readdirargs arg = {
678 .fh = NFS_FH(dir),
679 .cookie = nr_arg->cookie,
680 .plus = nr_arg->plus,
681 .count = nr_arg->page_len,
682 .pages = nr_arg->pages
683 };
684 struct nfs3_readdirres res = {
685 .verf = nr_res->verf,
686 .plus = nr_arg->plus,
687 };
688 struct rpc_message msg = {
689 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
690 .rpc_argp = &arg,
691 .rpc_resp = &res,
692 .rpc_cred = nr_arg->cred,
693 };
694 int status = -ENOMEM;
695
696 if (nr_arg->plus)
697 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
698 if (arg.cookie)
699 memcpy(arg.verf, nr_arg->verf, sizeof(arg.verf));
700
701 dprintk("NFS call readdir%s %llu\n", nr_arg->plus ? "plus" : "",
702 (unsigned long long)nr_arg->cookie);
703
704 res.dir_attr = nfs_alloc_fattr();
705 if (res.dir_attr == NULL)
706 goto out;
707
708 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
709
710 nfs_invalidate_atime(dir);
711 nfs_refresh_inode(dir, res.dir_attr);
712
713 nfs_free_fattr(res.dir_attr);
714 out:
715 dprintk("NFS reply readdir%s: %d\n", nr_arg->plus ? "plus" : "",
716 status);
717 return status;
718 }
719
720 static int
nfs3_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)721 nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
722 dev_t rdev)
723 {
724 struct posix_acl *default_acl, *acl;
725 struct nfs3_createdata *data;
726 struct dentry *d_alias;
727 int status = -ENOMEM;
728
729 dprintk("NFS call mknod %pd %u:%u\n", dentry,
730 MAJOR(rdev), MINOR(rdev));
731
732 data = nfs3_alloc_createdata();
733 if (data == NULL)
734 goto out;
735
736 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
737 if (status)
738 goto out;
739
740 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
741 data->arg.mknod.fh = NFS_FH(dir);
742 data->arg.mknod.name = dentry->d_name.name;
743 data->arg.mknod.len = dentry->d_name.len;
744 data->arg.mknod.sattr = sattr;
745 data->arg.mknod.rdev = rdev;
746
747 switch (sattr->ia_mode & S_IFMT) {
748 case S_IFBLK:
749 data->arg.mknod.type = NF3BLK;
750 break;
751 case S_IFCHR:
752 data->arg.mknod.type = NF3CHR;
753 break;
754 case S_IFIFO:
755 data->arg.mknod.type = NF3FIFO;
756 break;
757 case S_IFSOCK:
758 data->arg.mknod.type = NF3SOCK;
759 break;
760 default:
761 status = -EINVAL;
762 goto out_release_acls;
763 }
764
765 d_alias = nfs3_do_create(dir, dentry, data);
766 status = PTR_ERR_OR_ZERO(d_alias);
767 if (status != 0)
768 goto out_release_acls;
769
770 if (d_alias)
771 dentry = d_alias;
772
773 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
774
775 dput(d_alias);
776 out_release_acls:
777 posix_acl_release(acl);
778 posix_acl_release(default_acl);
779 out:
780 nfs3_free_createdata(data);
781 dprintk("NFS reply mknod: %d\n", status);
782 return status;
783 }
784
785 static int
nfs3_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * stat)786 nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
787 struct nfs_fsstat *stat)
788 {
789 struct rpc_message msg = {
790 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
791 .rpc_argp = fhandle,
792 .rpc_resp = stat,
793 };
794 int status;
795
796 dprintk("NFS call fsstat\n");
797 nfs_fattr_init(stat->fattr);
798 status = rpc_call_sync(server->client, &msg, 0);
799 dprintk("NFS reply fsstat: %d\n", status);
800 return status;
801 }
802
803 static int
do_proc_fsinfo(struct rpc_clnt * client,struct nfs_fh * fhandle,struct nfs_fsinfo * info)804 do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
805 struct nfs_fsinfo *info)
806 {
807 struct rpc_message msg = {
808 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
809 .rpc_argp = fhandle,
810 .rpc_resp = info,
811 };
812 int status;
813
814 dprintk("NFS call fsinfo\n");
815 nfs_fattr_init(info->fattr);
816 status = rpc_call_sync(client, &msg, 0);
817 dprintk("NFS reply fsinfo: %d\n", status);
818 return status;
819 }
820
821 /*
822 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
823 * nfs_create_server
824 */
825 static int
nfs3_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)826 nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
827 struct nfs_fsinfo *info)
828 {
829 int status;
830
831 status = do_proc_fsinfo(server->client, fhandle, info);
832 if (status && server->nfs_client->cl_rpcclient != server->client)
833 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
834 return status;
835 }
836
837 static int
nfs3_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * info)838 nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
839 struct nfs_pathconf *info)
840 {
841 struct rpc_message msg = {
842 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
843 .rpc_argp = fhandle,
844 .rpc_resp = info,
845 };
846 int status;
847
848 dprintk("NFS call pathconf\n");
849 nfs_fattr_init(info->fattr);
850 status = rpc_call_sync(server->client, &msg, 0);
851 dprintk("NFS reply pathconf: %d\n", status);
852 return status;
853 }
854
855 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
856
857 static unsigned nfs3_localio_probe_throttle __read_mostly = 0;
858 module_param(nfs3_localio_probe_throttle, uint, 0644);
859 MODULE_PARM_DESC(nfs3_localio_probe_throttle,
860 "Probe for NFSv3 LOCALIO every N IO requests. Must be power-of-2, defaults to 0 (probing disabled).");
861
nfs3_localio_probe(struct nfs_server * server)862 static void nfs3_localio_probe(struct nfs_server *server)
863 {
864 struct nfs_client *clp = server->nfs_client;
865
866 /* Throttled to reduce nfs_local_probe_async() frequency */
867 if (!nfs3_localio_probe_throttle || nfs_server_is_local(clp))
868 return;
869
870 /*
871 * Try (re)enabling LOCALIO if isn't enabled -- admin deems
872 * it worthwhile to periodically check if LOCALIO possible by
873 * setting the 'nfs3_localio_probe_throttle' module parameter.
874 *
875 * This is useful if LOCALIO was previously enabled, but was
876 * disabled due to server restart, and IO has successfully
877 * completed in terms of normal RPC.
878 */
879 if ((clp->cl_uuid.nfs3_localio_probe_count++ &
880 (nfs3_localio_probe_throttle - 1)) == 0) {
881 if (!nfs_server_is_local(clp))
882 nfs_local_probe_async(clp);
883 }
884 }
885
886 #else
nfs3_localio_probe(struct nfs_server * server)887 static void nfs3_localio_probe(struct nfs_server *server) {}
888 #endif
889
nfs3_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)890 static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
891 {
892 struct inode *inode = hdr->inode;
893 struct nfs_server *server = NFS_SERVER(inode);
894
895 if (hdr->pgio_done_cb != NULL)
896 return hdr->pgio_done_cb(task, hdr);
897
898 if (nfs3_async_handle_jukebox(task, inode))
899 return -EAGAIN;
900
901 if (task->tk_status >= 0) {
902 if (!server->read_hdrsize)
903 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
904 nfs3_localio_probe(server);
905 }
906
907 nfs_invalidate_atime(inode);
908 nfs_refresh_inode(inode, &hdr->fattr);
909 return 0;
910 }
911
nfs3_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)912 static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
913 struct rpc_message *msg)
914 {
915 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
916 hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
917 }
918
nfs3_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)919 static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
920 struct nfs_pgio_header *hdr)
921 {
922 rpc_call_start(task);
923 return 0;
924 }
925
nfs3_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)926 static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
927 {
928 struct inode *inode = hdr->inode;
929
930 if (hdr->pgio_done_cb != NULL)
931 return hdr->pgio_done_cb(task, hdr);
932
933 if (nfs3_async_handle_jukebox(task, inode))
934 return -EAGAIN;
935 if (task->tk_status >= 0) {
936 nfs_writeback_update_inode(hdr);
937 nfs3_localio_probe(NFS_SERVER(inode));
938 }
939 return 0;
940 }
941
nfs3_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)942 static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
943 struct rpc_message *msg,
944 struct rpc_clnt **clnt)
945 {
946 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
947 }
948
nfs3_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)949 static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
950 {
951 rpc_call_start(task);
952 }
953
nfs3_commit_done(struct rpc_task * task,struct nfs_commit_data * data)954 static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
955 {
956 if (data->commit_done_cb != NULL)
957 return data->commit_done_cb(task, data);
958
959 if (nfs3_async_handle_jukebox(task, data->inode))
960 return -EAGAIN;
961 nfs_refresh_inode(data->inode, data->res.fattr);
962 return 0;
963 }
964
nfs3_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)965 static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
966 struct rpc_clnt **clnt)
967 {
968 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
969 }
970
nfs3_nlm_alloc_call(void * data)971 static void nfs3_nlm_alloc_call(void *data)
972 {
973 struct nfs_lock_context *l_ctx = data;
974 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
975 get_nfs_open_context(l_ctx->open_context);
976 nfs_get_lock_context(l_ctx->open_context);
977 }
978 }
979
nfs3_nlm_unlock_prepare(struct rpc_task * task,void * data)980 static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
981 {
982 struct nfs_lock_context *l_ctx = data;
983 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
984 return nfs_async_iocounter_wait(task, l_ctx);
985 return false;
986
987 }
988
nfs3_nlm_release_call(void * data)989 static void nfs3_nlm_release_call(void *data)
990 {
991 struct nfs_lock_context *l_ctx = data;
992 struct nfs_open_context *ctx;
993 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
994 ctx = l_ctx->open_context;
995 nfs_put_lock_context(l_ctx);
996 put_nfs_open_context(ctx);
997 }
998 }
999
1000 static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
1001 .nlmclnt_alloc_call = nfs3_nlm_alloc_call,
1002 .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
1003 .nlmclnt_release_call = nfs3_nlm_release_call,
1004 };
1005
1006 static int
nfs3_proc_lock(struct file * filp,int cmd,struct file_lock * fl)1007 nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
1008 {
1009 struct inode *inode = file_inode(filp);
1010 struct nfs_lock_context *l_ctx = NULL;
1011 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1012 int status;
1013
1014 if (fl->c.flc_flags & FL_CLOSE) {
1015 l_ctx = nfs_get_lock_context(ctx);
1016 if (IS_ERR(l_ctx))
1017 l_ctx = NULL;
1018 else
1019 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
1020 }
1021
1022 status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
1023
1024 if (l_ctx)
1025 nfs_put_lock_context(l_ctx);
1026
1027 return status;
1028 }
1029
nfs3_have_delegation(struct inode * inode,fmode_t type,int flags)1030 static int nfs3_have_delegation(struct inode *inode, fmode_t type, int flags)
1031 {
1032 return 0;
1033 }
1034
nfs3_return_delegation(struct inode * inode)1035 static void nfs3_return_delegation(struct inode *inode)
1036 {
1037 if (S_ISREG(inode->i_mode))
1038 nfs_wb_all(inode);
1039 }
1040
1041 static const struct inode_operations nfs3_dir_inode_operations = {
1042 .create = nfs_create,
1043 .atomic_open = nfs_atomic_open_v23,
1044 .lookup = nfs_lookup,
1045 .link = nfs_link,
1046 .unlink = nfs_unlink,
1047 .symlink = nfs_symlink,
1048 .mkdir = nfs_mkdir,
1049 .rmdir = nfs_rmdir,
1050 .mknod = nfs_mknod,
1051 .rename = nfs_rename,
1052 .permission = nfs_permission,
1053 .getattr = nfs_getattr,
1054 .setattr = nfs_setattr,
1055 #ifdef CONFIG_NFS_V3_ACL
1056 .listxattr = nfs3_listxattr,
1057 .get_inode_acl = nfs3_get_acl,
1058 .set_acl = nfs3_set_acl,
1059 #endif
1060 };
1061
1062 static const struct inode_operations nfs3_file_inode_operations = {
1063 .permission = nfs_permission,
1064 .getattr = nfs_getattr,
1065 .setattr = nfs_setattr,
1066 #ifdef CONFIG_NFS_V3_ACL
1067 .listxattr = nfs3_listxattr,
1068 .get_inode_acl = nfs3_get_acl,
1069 .set_acl = nfs3_set_acl,
1070 #endif
1071 };
1072
1073 const struct nfs_rpc_ops nfs_v3_clientops = {
1074 .version = 3, /* protocol version */
1075 .dentry_ops = &nfs_dentry_operations,
1076 .dir_inode_ops = &nfs3_dir_inode_operations,
1077 .file_inode_ops = &nfs3_file_inode_operations,
1078 .file_ops = &nfs_file_operations,
1079 .nlmclnt_ops = &nlmclnt_fl_close_lock_ops,
1080 .getroot = nfs3_proc_get_root,
1081 .submount = nfs_submount,
1082 .try_get_tree = nfs_try_get_tree,
1083 .getattr = nfs3_proc_getattr,
1084 .setattr = nfs3_proc_setattr,
1085 .lookup = nfs3_proc_lookup,
1086 .lookupp = nfs3_proc_lookupp,
1087 .access = nfs3_proc_access,
1088 .readlink = nfs3_proc_readlink,
1089 .create = nfs3_proc_create,
1090 .remove = nfs3_proc_remove,
1091 .unlink_setup = nfs3_proc_unlink_setup,
1092 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1093 .unlink_done = nfs3_proc_unlink_done,
1094 .rename_setup = nfs3_proc_rename_setup,
1095 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1096 .rename_done = nfs3_proc_rename_done,
1097 .link = nfs3_proc_link,
1098 .symlink = nfs3_proc_symlink,
1099 .mkdir = nfs3_proc_mkdir,
1100 .rmdir = nfs3_proc_rmdir,
1101 .readdir = nfs3_proc_readdir,
1102 .mknod = nfs3_proc_mknod,
1103 .statfs = nfs3_proc_statfs,
1104 .fsinfo = nfs3_proc_fsinfo,
1105 .pathconf = nfs3_proc_pathconf,
1106 .decode_dirent = nfs3_decode_dirent,
1107 .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1108 .read_setup = nfs3_proc_read_setup,
1109 .read_done = nfs3_read_done,
1110 .write_setup = nfs3_proc_write_setup,
1111 .write_done = nfs3_write_done,
1112 .commit_setup = nfs3_proc_commit_setup,
1113 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1114 .commit_done = nfs3_commit_done,
1115 .lock = nfs3_proc_lock,
1116 .clear_acl_cache = forget_all_cached_acls,
1117 .close_context = nfs_close_context,
1118 .have_delegation = nfs3_have_delegation,
1119 .return_delegation = nfs3_return_delegation,
1120 .alloc_client = nfs_alloc_client,
1121 .init_client = nfs_init_client,
1122 .free_client = nfs_free_client,
1123 .create_server = nfs3_create_server,
1124 .clone_server = nfs3_clone_server,
1125 };
1126