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));
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(sizeof(*data), GFP_KERNEL);
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 dentry = d_alias;
397
398 /* When we created the file with exclusive semantics, make
399 * sure we set the attributes afterwards. */
400 if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
401 dprintk("NFS call setattr (post-create)\n");
402
403 if (!(sattr->ia_valid & ATTR_ATIME_SET))
404 sattr->ia_valid |= ATTR_ATIME;
405 if (!(sattr->ia_valid & ATTR_MTIME_SET))
406 sattr->ia_valid |= ATTR_MTIME;
407
408 /* Note: we could use a guarded setattr here, but I'm
409 * not sure this buys us anything (and I'd have
410 * to revamp the NFSv3 XDR code) */
411 status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
412 nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
413 dprintk("NFS reply setattr (post-create): %d\n", status);
414 if (status != 0)
415 goto out_dput;
416 }
417
418 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
419
420 out_dput:
421 dput(d_alias);
422 out_release_acls:
423 posix_acl_release(acl);
424 posix_acl_release(default_acl);
425 out:
426 nfs3_free_createdata(data);
427 dprintk("NFS reply create: %d\n", status);
428 return status;
429 }
430
431 static int
nfs3_proc_remove(struct inode * dir,struct dentry * dentry)432 nfs3_proc_remove(struct inode *dir, struct dentry *dentry)
433 {
434 struct nfs_removeargs arg = {
435 .fh = NFS_FH(dir),
436 .name = dentry->d_name,
437 };
438 struct nfs_removeres res;
439 struct rpc_message msg = {
440 .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
441 .rpc_argp = &arg,
442 .rpc_resp = &res,
443 };
444 int status = -ENOMEM;
445
446 dprintk("NFS call remove %pd2\n", dentry);
447 res.dir_attr = nfs_alloc_fattr();
448 if (res.dir_attr == NULL)
449 goto out;
450
451 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
452 nfs_post_op_update_inode(dir, res.dir_attr);
453 nfs_free_fattr(res.dir_attr);
454 out:
455 dprintk("NFS reply remove: %d\n", status);
456 return status;
457 }
458
459 static void
nfs3_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)460 nfs3_proc_unlink_setup(struct rpc_message *msg,
461 struct dentry *dentry,
462 struct inode *inode)
463 {
464 msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
465 }
466
nfs3_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)467 static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
468 {
469 rpc_call_start(task);
470 }
471
472 static int
nfs3_proc_unlink_done(struct rpc_task * task,struct inode * dir)473 nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
474 {
475 struct nfs_removeres *res;
476 if (nfs3_async_handle_jukebox(task, dir))
477 return 0;
478 res = task->tk_msg.rpc_resp;
479 nfs_post_op_update_inode(dir, res->dir_attr);
480 return 1;
481 }
482
483 static void
nfs3_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)484 nfs3_proc_rename_setup(struct rpc_message *msg,
485 struct dentry *old_dentry,
486 struct dentry *new_dentry)
487 {
488 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
489 }
490
nfs3_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)491 static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
492 {
493 rpc_call_start(task);
494 }
495
496 static int
nfs3_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)497 nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
498 struct inode *new_dir)
499 {
500 struct nfs_renameres *res;
501
502 if (nfs3_async_handle_jukebox(task, old_dir))
503 return 0;
504 res = task->tk_msg.rpc_resp;
505
506 nfs_post_op_update_inode(old_dir, res->old_fattr);
507 nfs_post_op_update_inode(new_dir, res->new_fattr);
508 return 1;
509 }
510
511 static int
nfs3_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)512 nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
513 {
514 struct nfs3_linkargs arg = {
515 .fromfh = NFS_FH(inode),
516 .tofh = NFS_FH(dir),
517 .toname = name->name,
518 .tolen = name->len
519 };
520 struct nfs3_linkres res;
521 struct rpc_message msg = {
522 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK],
523 .rpc_argp = &arg,
524 .rpc_resp = &res,
525 };
526 int status = -ENOMEM;
527
528 dprintk("NFS call link %s\n", name->name);
529 res.fattr = nfs_alloc_fattr();
530 res.dir_attr = nfs_alloc_fattr();
531 if (res.fattr == NULL || res.dir_attr == NULL)
532 goto out;
533
534 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
535 nfs_post_op_update_inode(dir, res.dir_attr);
536 nfs_post_op_update_inode(inode, res.fattr);
537 out:
538 nfs_free_fattr(res.dir_attr);
539 nfs_free_fattr(res.fattr);
540 dprintk("NFS reply link: %d\n", status);
541 return status;
542 }
543
544 static int
nfs3_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr)545 nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct folio *folio,
546 unsigned int len, struct iattr *sattr)
547 {
548 struct page *page = &folio->page;
549 struct nfs3_createdata *data;
550 struct dentry *d_alias;
551 int status = -ENOMEM;
552
553 if (len > NFS3_MAXPATHLEN)
554 return -ENAMETOOLONG;
555
556 dprintk("NFS call symlink %pd\n", dentry);
557
558 data = nfs3_alloc_createdata();
559 if (data == NULL)
560 goto out;
561 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
562 data->arg.symlink.fromfh = NFS_FH(dir);
563 data->arg.symlink.fromname = dentry->d_name.name;
564 data->arg.symlink.fromlen = dentry->d_name.len;
565 data->arg.symlink.pages = &page;
566 data->arg.symlink.pathlen = len;
567 data->arg.symlink.sattr = sattr;
568
569 d_alias = nfs3_do_create(dir, dentry, data);
570 status = PTR_ERR_OR_ZERO(d_alias);
571
572 if (status == 0)
573 dput(d_alias);
574
575 nfs3_free_createdata(data);
576 out:
577 dprintk("NFS reply symlink: %d\n", status);
578 return status;
579 }
580
581 static int
nfs3_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)582 nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
583 {
584 struct posix_acl *default_acl, *acl;
585 struct nfs3_createdata *data;
586 struct dentry *d_alias;
587 int status = -ENOMEM;
588
589 dprintk("NFS call mkdir %pd\n", dentry);
590
591 data = nfs3_alloc_createdata();
592 if (data == NULL)
593 goto out;
594
595 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
596 if (status)
597 goto out;
598
599 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
600 data->arg.mkdir.fh = NFS_FH(dir);
601 data->arg.mkdir.name = dentry->d_name.name;
602 data->arg.mkdir.len = dentry->d_name.len;
603 data->arg.mkdir.sattr = sattr;
604
605 d_alias = nfs3_do_create(dir, dentry, data);
606 status = PTR_ERR_OR_ZERO(d_alias);
607
608 if (status != 0)
609 goto out_release_acls;
610
611 if (d_alias)
612 dentry = d_alias;
613
614 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
615
616 dput(d_alias);
617 out_release_acls:
618 posix_acl_release(acl);
619 posix_acl_release(default_acl);
620 out:
621 nfs3_free_createdata(data);
622 dprintk("NFS reply mkdir: %d\n", status);
623 return status;
624 }
625
626 static int
nfs3_proc_rmdir(struct inode * dir,const struct qstr * name)627 nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
628 {
629 struct nfs_fattr *dir_attr;
630 struct nfs3_diropargs arg = {
631 .fh = NFS_FH(dir),
632 .name = name->name,
633 .len = name->len
634 };
635 struct rpc_message msg = {
636 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
637 .rpc_argp = &arg,
638 };
639 int status = -ENOMEM;
640
641 dprintk("NFS call rmdir %s\n", name->name);
642 dir_attr = nfs_alloc_fattr();
643 if (dir_attr == NULL)
644 goto out;
645
646 msg.rpc_resp = dir_attr;
647 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
648 nfs_post_op_update_inode(dir, dir_attr);
649 nfs_free_fattr(dir_attr);
650 out:
651 dprintk("NFS reply rmdir: %d\n", status);
652 return status;
653 }
654
655 /*
656 * The READDIR implementation is somewhat hackish - we pass the user buffer
657 * to the encode function, which installs it in the receive iovec.
658 * The decode function itself doesn't perform any decoding, it just makes
659 * sure the reply is syntactically correct.
660 *
661 * Also note that this implementation handles both plain readdir and
662 * readdirplus.
663 */
nfs3_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)664 static int nfs3_proc_readdir(struct nfs_readdir_arg *nr_arg,
665 struct nfs_readdir_res *nr_res)
666 {
667 struct inode *dir = d_inode(nr_arg->dentry);
668 struct nfs3_readdirargs arg = {
669 .fh = NFS_FH(dir),
670 .cookie = nr_arg->cookie,
671 .plus = nr_arg->plus,
672 .count = nr_arg->page_len,
673 .pages = nr_arg->pages
674 };
675 struct nfs3_readdirres res = {
676 .verf = nr_res->verf,
677 .plus = nr_arg->plus,
678 };
679 struct rpc_message msg = {
680 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
681 .rpc_argp = &arg,
682 .rpc_resp = &res,
683 .rpc_cred = nr_arg->cred,
684 };
685 int status = -ENOMEM;
686
687 if (nr_arg->plus)
688 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
689 if (arg.cookie)
690 memcpy(arg.verf, nr_arg->verf, sizeof(arg.verf));
691
692 dprintk("NFS call readdir%s %llu\n", nr_arg->plus ? "plus" : "",
693 (unsigned long long)nr_arg->cookie);
694
695 res.dir_attr = nfs_alloc_fattr();
696 if (res.dir_attr == NULL)
697 goto out;
698
699 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
700
701 nfs_invalidate_atime(dir);
702 nfs_refresh_inode(dir, res.dir_attr);
703
704 nfs_free_fattr(res.dir_attr);
705 out:
706 dprintk("NFS reply readdir%s: %d\n", nr_arg->plus ? "plus" : "",
707 status);
708 return status;
709 }
710
711 static int
nfs3_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)712 nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
713 dev_t rdev)
714 {
715 struct posix_acl *default_acl, *acl;
716 struct nfs3_createdata *data;
717 struct dentry *d_alias;
718 int status = -ENOMEM;
719
720 dprintk("NFS call mknod %pd %u:%u\n", dentry,
721 MAJOR(rdev), MINOR(rdev));
722
723 data = nfs3_alloc_createdata();
724 if (data == NULL)
725 goto out;
726
727 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
728 if (status)
729 goto out;
730
731 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
732 data->arg.mknod.fh = NFS_FH(dir);
733 data->arg.mknod.name = dentry->d_name.name;
734 data->arg.mknod.len = dentry->d_name.len;
735 data->arg.mknod.sattr = sattr;
736 data->arg.mknod.rdev = rdev;
737
738 switch (sattr->ia_mode & S_IFMT) {
739 case S_IFBLK:
740 data->arg.mknod.type = NF3BLK;
741 break;
742 case S_IFCHR:
743 data->arg.mknod.type = NF3CHR;
744 break;
745 case S_IFIFO:
746 data->arg.mknod.type = NF3FIFO;
747 break;
748 case S_IFSOCK:
749 data->arg.mknod.type = NF3SOCK;
750 break;
751 default:
752 status = -EINVAL;
753 goto out_release_acls;
754 }
755
756 d_alias = nfs3_do_create(dir, dentry, data);
757 status = PTR_ERR_OR_ZERO(d_alias);
758 if (status != 0)
759 goto out_release_acls;
760
761 if (d_alias)
762 dentry = d_alias;
763
764 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
765
766 dput(d_alias);
767 out_release_acls:
768 posix_acl_release(acl);
769 posix_acl_release(default_acl);
770 out:
771 nfs3_free_createdata(data);
772 dprintk("NFS reply mknod: %d\n", status);
773 return status;
774 }
775
776 static int
nfs3_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * stat)777 nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
778 struct nfs_fsstat *stat)
779 {
780 struct rpc_message msg = {
781 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
782 .rpc_argp = fhandle,
783 .rpc_resp = stat,
784 };
785 int status;
786
787 dprintk("NFS call fsstat\n");
788 nfs_fattr_init(stat->fattr);
789 status = rpc_call_sync(server->client, &msg, 0);
790 dprintk("NFS reply fsstat: %d\n", status);
791 return status;
792 }
793
794 static int
do_proc_fsinfo(struct rpc_clnt * client,struct nfs_fh * fhandle,struct nfs_fsinfo * info)795 do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
796 struct nfs_fsinfo *info)
797 {
798 struct rpc_message msg = {
799 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
800 .rpc_argp = fhandle,
801 .rpc_resp = info,
802 };
803 int status;
804
805 dprintk("NFS call fsinfo\n");
806 nfs_fattr_init(info->fattr);
807 status = rpc_call_sync(client, &msg, 0);
808 dprintk("NFS reply fsinfo: %d\n", status);
809 return status;
810 }
811
812 /*
813 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
814 * nfs_create_server
815 */
816 static int
nfs3_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)817 nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
818 struct nfs_fsinfo *info)
819 {
820 int status;
821
822 status = do_proc_fsinfo(server->client, fhandle, info);
823 if (status && server->nfs_client->cl_rpcclient != server->client)
824 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
825 return status;
826 }
827
828 static int
nfs3_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * info)829 nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
830 struct nfs_pathconf *info)
831 {
832 struct rpc_message msg = {
833 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
834 .rpc_argp = fhandle,
835 .rpc_resp = info,
836 };
837 int status;
838
839 dprintk("NFS call pathconf\n");
840 nfs_fattr_init(info->fattr);
841 status = rpc_call_sync(server->client, &msg, 0);
842 dprintk("NFS reply pathconf: %d\n", status);
843 return status;
844 }
845
846 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
847
848 static unsigned nfs3_localio_probe_throttle __read_mostly = 0;
849 module_param(nfs3_localio_probe_throttle, uint, 0644);
850 MODULE_PARM_DESC(nfs3_localio_probe_throttle,
851 "Probe for NFSv3 LOCALIO every N IO requests. Must be power-of-2, defaults to 0 (probing disabled).");
852
nfs3_localio_probe(struct nfs_server * server)853 static void nfs3_localio_probe(struct nfs_server *server)
854 {
855 struct nfs_client *clp = server->nfs_client;
856
857 /* Throttled to reduce nfs_local_probe_async() frequency */
858 if (!nfs3_localio_probe_throttle || nfs_server_is_local(clp))
859 return;
860
861 /*
862 * Try (re)enabling LOCALIO if isn't enabled -- admin deems
863 * it worthwhile to periodically check if LOCALIO possible by
864 * setting the 'nfs3_localio_probe_throttle' module parameter.
865 *
866 * This is useful if LOCALIO was previously enabled, but was
867 * disabled due to server restart, and IO has successfully
868 * completed in terms of normal RPC.
869 */
870 if ((clp->cl_uuid.nfs3_localio_probe_count++ &
871 (nfs3_localio_probe_throttle - 1)) == 0) {
872 if (!nfs_server_is_local(clp))
873 nfs_local_probe_async(clp);
874 }
875 }
876
877 #else
nfs3_localio_probe(struct nfs_server * server)878 static void nfs3_localio_probe(struct nfs_server *server) {}
879 #endif
880
nfs3_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)881 static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
882 {
883 struct inode *inode = hdr->inode;
884 struct nfs_server *server = NFS_SERVER(inode);
885
886 if (hdr->pgio_done_cb != NULL)
887 return hdr->pgio_done_cb(task, hdr);
888
889 if (nfs3_async_handle_jukebox(task, inode))
890 return -EAGAIN;
891
892 if (task->tk_status >= 0) {
893 if (!server->read_hdrsize)
894 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
895 nfs3_localio_probe(server);
896 }
897
898 nfs_invalidate_atime(inode);
899 nfs_refresh_inode(inode, &hdr->fattr);
900 return 0;
901 }
902
nfs3_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)903 static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
904 struct rpc_message *msg)
905 {
906 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
907 hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
908 }
909
nfs3_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)910 static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
911 struct nfs_pgio_header *hdr)
912 {
913 rpc_call_start(task);
914 return 0;
915 }
916
nfs3_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)917 static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
918 {
919 struct inode *inode = hdr->inode;
920
921 if (hdr->pgio_done_cb != NULL)
922 return hdr->pgio_done_cb(task, hdr);
923
924 if (nfs3_async_handle_jukebox(task, inode))
925 return -EAGAIN;
926 if (task->tk_status >= 0) {
927 nfs_writeback_update_inode(hdr);
928 nfs3_localio_probe(NFS_SERVER(inode));
929 }
930 return 0;
931 }
932
nfs3_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)933 static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
934 struct rpc_message *msg,
935 struct rpc_clnt **clnt)
936 {
937 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
938 }
939
nfs3_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)940 static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
941 {
942 rpc_call_start(task);
943 }
944
nfs3_commit_done(struct rpc_task * task,struct nfs_commit_data * data)945 static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
946 {
947 if (data->commit_done_cb != NULL)
948 return data->commit_done_cb(task, data);
949
950 if (nfs3_async_handle_jukebox(task, data->inode))
951 return -EAGAIN;
952 nfs_refresh_inode(data->inode, data->res.fattr);
953 return 0;
954 }
955
nfs3_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)956 static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
957 struct rpc_clnt **clnt)
958 {
959 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
960 }
961
nfs3_nlm_alloc_call(void * data)962 static void nfs3_nlm_alloc_call(void *data)
963 {
964 struct nfs_lock_context *l_ctx = data;
965 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
966 get_nfs_open_context(l_ctx->open_context);
967 nfs_get_lock_context(l_ctx->open_context);
968 }
969 }
970
nfs3_nlm_unlock_prepare(struct rpc_task * task,void * data)971 static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, 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 return nfs_async_iocounter_wait(task, l_ctx);
976 return false;
977
978 }
979
nfs3_nlm_release_call(void * data)980 static void nfs3_nlm_release_call(void *data)
981 {
982 struct nfs_lock_context *l_ctx = data;
983 struct nfs_open_context *ctx;
984 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
985 ctx = l_ctx->open_context;
986 nfs_put_lock_context(l_ctx);
987 put_nfs_open_context(ctx);
988 }
989 }
990
991 static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
992 .nlmclnt_alloc_call = nfs3_nlm_alloc_call,
993 .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
994 .nlmclnt_release_call = nfs3_nlm_release_call,
995 };
996
997 static int
nfs3_proc_lock(struct file * filp,int cmd,struct file_lock * fl)998 nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
999 {
1000 struct inode *inode = file_inode(filp);
1001 struct nfs_lock_context *l_ctx = NULL;
1002 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1003 int status;
1004
1005 if (fl->c.flc_flags & FL_CLOSE) {
1006 l_ctx = nfs_get_lock_context(ctx);
1007 if (IS_ERR(l_ctx))
1008 l_ctx = NULL;
1009 else
1010 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
1011 }
1012
1013 status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
1014
1015 if (l_ctx)
1016 nfs_put_lock_context(l_ctx);
1017
1018 return status;
1019 }
1020
nfs3_have_delegation(struct inode * inode,fmode_t type,int flags)1021 static int nfs3_have_delegation(struct inode *inode, fmode_t type, int flags)
1022 {
1023 return 0;
1024 }
1025
nfs3_return_delegation(struct inode * inode)1026 static int nfs3_return_delegation(struct inode *inode)
1027 {
1028 if (S_ISREG(inode->i_mode))
1029 nfs_wb_all(inode);
1030 return 0;
1031 }
1032
1033 static const struct inode_operations nfs3_dir_inode_operations = {
1034 .create = nfs_create,
1035 .atomic_open = nfs_atomic_open_v23,
1036 .lookup = nfs_lookup,
1037 .link = nfs_link,
1038 .unlink = nfs_unlink,
1039 .symlink = nfs_symlink,
1040 .mkdir = nfs_mkdir,
1041 .rmdir = nfs_rmdir,
1042 .mknod = nfs_mknod,
1043 .rename = nfs_rename,
1044 .permission = nfs_permission,
1045 .getattr = nfs_getattr,
1046 .setattr = nfs_setattr,
1047 #ifdef CONFIG_NFS_V3_ACL
1048 .listxattr = nfs3_listxattr,
1049 .get_inode_acl = nfs3_get_acl,
1050 .set_acl = nfs3_set_acl,
1051 #endif
1052 };
1053
1054 static const struct inode_operations nfs3_file_inode_operations = {
1055 .permission = nfs_permission,
1056 .getattr = nfs_getattr,
1057 .setattr = nfs_setattr,
1058 #ifdef CONFIG_NFS_V3_ACL
1059 .listxattr = nfs3_listxattr,
1060 .get_inode_acl = nfs3_get_acl,
1061 .set_acl = nfs3_set_acl,
1062 #endif
1063 };
1064
1065 const struct nfs_rpc_ops nfs_v3_clientops = {
1066 .version = 3, /* protocol version */
1067 .dentry_ops = &nfs_dentry_operations,
1068 .dir_inode_ops = &nfs3_dir_inode_operations,
1069 .file_inode_ops = &nfs3_file_inode_operations,
1070 .file_ops = &nfs_file_operations,
1071 .nlmclnt_ops = &nlmclnt_fl_close_lock_ops,
1072 .getroot = nfs3_proc_get_root,
1073 .submount = nfs_submount,
1074 .try_get_tree = nfs_try_get_tree,
1075 .getattr = nfs3_proc_getattr,
1076 .setattr = nfs3_proc_setattr,
1077 .lookup = nfs3_proc_lookup,
1078 .lookupp = nfs3_proc_lookupp,
1079 .access = nfs3_proc_access,
1080 .readlink = nfs3_proc_readlink,
1081 .create = nfs3_proc_create,
1082 .remove = nfs3_proc_remove,
1083 .unlink_setup = nfs3_proc_unlink_setup,
1084 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1085 .unlink_done = nfs3_proc_unlink_done,
1086 .rename_setup = nfs3_proc_rename_setup,
1087 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1088 .rename_done = nfs3_proc_rename_done,
1089 .link = nfs3_proc_link,
1090 .symlink = nfs3_proc_symlink,
1091 .mkdir = nfs3_proc_mkdir,
1092 .rmdir = nfs3_proc_rmdir,
1093 .readdir = nfs3_proc_readdir,
1094 .mknod = nfs3_proc_mknod,
1095 .statfs = nfs3_proc_statfs,
1096 .fsinfo = nfs3_proc_fsinfo,
1097 .pathconf = nfs3_proc_pathconf,
1098 .decode_dirent = nfs3_decode_dirent,
1099 .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1100 .read_setup = nfs3_proc_read_setup,
1101 .read_done = nfs3_read_done,
1102 .write_setup = nfs3_proc_write_setup,
1103 .write_done = nfs3_write_done,
1104 .commit_setup = nfs3_proc_commit_setup,
1105 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1106 .commit_done = nfs3_commit_done,
1107 .lock = nfs3_proc_lock,
1108 .clear_acl_cache = forget_all_cached_acls,
1109 .close_context = nfs_close_context,
1110 .have_delegation = nfs3_have_delegation,
1111 .return_delegation = nfs3_return_delegation,
1112 .alloc_client = nfs_alloc_client,
1113 .init_client = nfs_init_client,
1114 .free_client = nfs_free_client,
1115 .create_server = nfs3_create_server,
1116 .clone_server = nfs3_clone_server,
1117 };
1118