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(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,struct inode * same_parent)484 nfs3_proc_rename_setup(struct rpc_message *msg,
485 struct dentry *old_dentry,
486 struct dentry *new_dentry,
487 struct inode *same_parent)
488 {
489 msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
490 }
491
nfs3_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)492 static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
493 {
494 rpc_call_start(task);
495 }
496
497 static int
nfs3_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)498 nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
499 struct inode *new_dir)
500 {
501 struct nfs_renameres *res;
502
503 if (nfs3_async_handle_jukebox(task, old_dir))
504 return 0;
505 res = task->tk_msg.rpc_resp;
506
507 nfs_post_op_update_inode(old_dir, res->old_fattr);
508 nfs_post_op_update_inode(new_dir, res->new_fattr);
509 return 1;
510 }
511
512 static int
nfs3_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)513 nfs3_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
514 {
515 struct nfs3_linkargs arg = {
516 .fromfh = NFS_FH(inode),
517 .tofh = NFS_FH(dir),
518 .toname = name->name,
519 .tolen = name->len
520 };
521 struct nfs3_linkres res;
522 struct rpc_message msg = {
523 .rpc_proc = &nfs3_procedures[NFS3PROC_LINK],
524 .rpc_argp = &arg,
525 .rpc_resp = &res,
526 };
527 int status = -ENOMEM;
528
529 dprintk("NFS call link %s\n", name->name);
530 res.fattr = nfs_alloc_fattr();
531 res.dir_attr = nfs_alloc_fattr();
532 if (res.fattr == NULL || res.dir_attr == NULL)
533 goto out;
534
535 status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
536 nfs_post_op_update_inode(dir, res.dir_attr);
537 nfs_post_op_update_inode(inode, res.fattr);
538 out:
539 nfs_free_fattr(res.dir_attr);
540 nfs_free_fattr(res.fattr);
541 dprintk("NFS reply link: %d\n", status);
542 return status;
543 }
544
545 static int
nfs3_proc_symlink(struct inode * dir,struct dentry * dentry,struct folio * folio,unsigned int len,struct iattr * sattr)546 nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct folio *folio,
547 unsigned int len, struct iattr *sattr)
548 {
549 struct page *page = &folio->page;
550 struct nfs3_createdata *data;
551 struct dentry *d_alias;
552 int status = -ENOMEM;
553
554 if (len > NFS3_MAXPATHLEN)
555 return -ENAMETOOLONG;
556
557 dprintk("NFS call symlink %pd\n", dentry);
558
559 data = nfs3_alloc_createdata();
560 if (data == NULL)
561 goto out;
562 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
563 data->arg.symlink.fromfh = NFS_FH(dir);
564 data->arg.symlink.fromname = dentry->d_name.name;
565 data->arg.symlink.fromlen = dentry->d_name.len;
566 data->arg.symlink.pages = &page;
567 data->arg.symlink.pathlen = len;
568 data->arg.symlink.sattr = sattr;
569
570 d_alias = nfs3_do_create(dir, dentry, data);
571 status = PTR_ERR_OR_ZERO(d_alias);
572
573 if (status == 0)
574 dput(d_alias);
575
576 nfs3_free_createdata(data);
577 out:
578 dprintk("NFS reply symlink: %d\n", status);
579 return status;
580 }
581
582 static struct dentry *
nfs3_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)583 nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
584 {
585 struct posix_acl *default_acl, *acl;
586 struct nfs3_createdata *data;
587 struct dentry *ret = ERR_PTR(-ENOMEM);
588 int status;
589
590 dprintk("NFS call mkdir %pd\n", dentry);
591
592 data = nfs3_alloc_createdata();
593 if (data == NULL)
594 goto out;
595
596 ret = ERR_PTR(posix_acl_create(dir, &sattr->ia_mode,
597 &default_acl, &acl));
598 if (IS_ERR(ret))
599 goto out;
600
601 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
602 data->arg.mkdir.fh = NFS_FH(dir);
603 data->arg.mkdir.name = dentry->d_name.name;
604 data->arg.mkdir.len = dentry->d_name.len;
605 data->arg.mkdir.sattr = sattr;
606
607 ret = nfs3_do_create(dir, dentry, data);
608
609 if (IS_ERR(ret))
610 goto out_release_acls;
611
612 if (ret)
613 dentry = ret;
614
615 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
616 if (status) {
617 dput(ret);
618 ret = ERR_PTR(status);
619 }
620
621 out_release_acls:
622 posix_acl_release(acl);
623 posix_acl_release(default_acl);
624 out:
625 nfs3_free_createdata(data);
626 dprintk("NFS reply mkdir: %d\n", PTR_ERR_OR_ZERO(ret));
627 return ret;
628 }
629
630 static int
nfs3_proc_rmdir(struct inode * dir,const struct qstr * name)631 nfs3_proc_rmdir(struct inode *dir, const struct qstr *name)
632 {
633 struct nfs_fattr *dir_attr;
634 struct nfs3_diropargs arg = {
635 .fh = NFS_FH(dir),
636 .name = name->name,
637 .len = name->len
638 };
639 struct rpc_message msg = {
640 .rpc_proc = &nfs3_procedures[NFS3PROC_RMDIR],
641 .rpc_argp = &arg,
642 };
643 int status = -ENOMEM;
644
645 dprintk("NFS call rmdir %s\n", name->name);
646 dir_attr = nfs_alloc_fattr();
647 if (dir_attr == NULL)
648 goto out;
649
650 msg.rpc_resp = dir_attr;
651 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
652 nfs_post_op_update_inode(dir, dir_attr);
653 nfs_free_fattr(dir_attr);
654 out:
655 dprintk("NFS reply rmdir: %d\n", status);
656 return status;
657 }
658
659 /*
660 * The READDIR implementation is somewhat hackish - we pass the user buffer
661 * to the encode function, which installs it in the receive iovec.
662 * The decode function itself doesn't perform any decoding, it just makes
663 * sure the reply is syntactically correct.
664 *
665 * Also note that this implementation handles both plain readdir and
666 * readdirplus.
667 */
nfs3_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)668 static int nfs3_proc_readdir(struct nfs_readdir_arg *nr_arg,
669 struct nfs_readdir_res *nr_res)
670 {
671 struct inode *dir = d_inode(nr_arg->dentry);
672 struct nfs3_readdirargs arg = {
673 .fh = NFS_FH(dir),
674 .cookie = nr_arg->cookie,
675 .plus = nr_arg->plus,
676 .count = nr_arg->page_len,
677 .pages = nr_arg->pages
678 };
679 struct nfs3_readdirres res = {
680 .verf = nr_res->verf,
681 .plus = nr_arg->plus,
682 };
683 struct rpc_message msg = {
684 .rpc_proc = &nfs3_procedures[NFS3PROC_READDIR],
685 .rpc_argp = &arg,
686 .rpc_resp = &res,
687 .rpc_cred = nr_arg->cred,
688 };
689 int status = -ENOMEM;
690
691 if (nr_arg->plus)
692 msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];
693 if (arg.cookie)
694 memcpy(arg.verf, nr_arg->verf, sizeof(arg.verf));
695
696 dprintk("NFS call readdir%s %llu\n", nr_arg->plus ? "plus" : "",
697 (unsigned long long)nr_arg->cookie);
698
699 res.dir_attr = nfs_alloc_fattr();
700 if (res.dir_attr == NULL)
701 goto out;
702
703 status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
704
705 nfs_invalidate_atime(dir);
706 nfs_refresh_inode(dir, res.dir_attr);
707
708 nfs_free_fattr(res.dir_attr);
709 out:
710 dprintk("NFS reply readdir%s: %d\n", nr_arg->plus ? "plus" : "",
711 status);
712 return status;
713 }
714
715 static int
nfs3_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)716 nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
717 dev_t rdev)
718 {
719 struct posix_acl *default_acl, *acl;
720 struct nfs3_createdata *data;
721 struct dentry *d_alias;
722 int status = -ENOMEM;
723
724 dprintk("NFS call mknod %pd %u:%u\n", dentry,
725 MAJOR(rdev), MINOR(rdev));
726
727 data = nfs3_alloc_createdata();
728 if (data == NULL)
729 goto out;
730
731 status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
732 if (status)
733 goto out;
734
735 data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
736 data->arg.mknod.fh = NFS_FH(dir);
737 data->arg.mknod.name = dentry->d_name.name;
738 data->arg.mknod.len = dentry->d_name.len;
739 data->arg.mknod.sattr = sattr;
740 data->arg.mknod.rdev = rdev;
741
742 switch (sattr->ia_mode & S_IFMT) {
743 case S_IFBLK:
744 data->arg.mknod.type = NF3BLK;
745 break;
746 case S_IFCHR:
747 data->arg.mknod.type = NF3CHR;
748 break;
749 case S_IFIFO:
750 data->arg.mknod.type = NF3FIFO;
751 break;
752 case S_IFSOCK:
753 data->arg.mknod.type = NF3SOCK;
754 break;
755 default:
756 status = -EINVAL;
757 goto out_release_acls;
758 }
759
760 d_alias = nfs3_do_create(dir, dentry, data);
761 status = PTR_ERR_OR_ZERO(d_alias);
762 if (status != 0)
763 goto out_release_acls;
764
765 if (d_alias)
766 dentry = d_alias;
767
768 status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
769
770 dput(d_alias);
771 out_release_acls:
772 posix_acl_release(acl);
773 posix_acl_release(default_acl);
774 out:
775 nfs3_free_createdata(data);
776 dprintk("NFS reply mknod: %d\n", status);
777 return status;
778 }
779
780 static int
nfs3_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * stat)781 nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
782 struct nfs_fsstat *stat)
783 {
784 struct rpc_message msg = {
785 .rpc_proc = &nfs3_procedures[NFS3PROC_FSSTAT],
786 .rpc_argp = fhandle,
787 .rpc_resp = stat,
788 };
789 int status;
790
791 dprintk("NFS call fsstat\n");
792 nfs_fattr_init(stat->fattr);
793 status = rpc_call_sync(server->client, &msg, 0);
794 dprintk("NFS reply fsstat: %d\n", status);
795 return status;
796 }
797
798 static int
do_proc_fsinfo(struct rpc_clnt * client,struct nfs_fh * fhandle,struct nfs_fsinfo * info)799 do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
800 struct nfs_fsinfo *info)
801 {
802 struct rpc_message msg = {
803 .rpc_proc = &nfs3_procedures[NFS3PROC_FSINFO],
804 .rpc_argp = fhandle,
805 .rpc_resp = info,
806 };
807 int status;
808
809 dprintk("NFS call fsinfo\n");
810 nfs_fattr_init(info->fattr);
811 status = rpc_call_sync(client, &msg, 0);
812 dprintk("NFS reply fsinfo: %d\n", status);
813 return status;
814 }
815
816 /*
817 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
818 * nfs_create_server
819 */
820 static int
nfs3_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)821 nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
822 struct nfs_fsinfo *info)
823 {
824 int status;
825
826 status = do_proc_fsinfo(server->client, fhandle, info);
827 if (status && server->nfs_client->cl_rpcclient != server->client)
828 status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
829 return status;
830 }
831
832 static int
nfs3_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * info)833 nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
834 struct nfs_pathconf *info)
835 {
836 struct rpc_message msg = {
837 .rpc_proc = &nfs3_procedures[NFS3PROC_PATHCONF],
838 .rpc_argp = fhandle,
839 .rpc_resp = info,
840 };
841 int status;
842
843 dprintk("NFS call pathconf\n");
844 nfs_fattr_init(info->fattr);
845 status = rpc_call_sync(server->client, &msg, 0);
846 dprintk("NFS reply pathconf: %d\n", status);
847 return status;
848 }
849
850 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
851
852 static unsigned nfs3_localio_probe_throttle __read_mostly = 0;
853 module_param(nfs3_localio_probe_throttle, uint, 0644);
854 MODULE_PARM_DESC(nfs3_localio_probe_throttle,
855 "Probe for NFSv3 LOCALIO every N IO requests. Must be power-of-2, defaults to 0 (probing disabled).");
856
nfs3_localio_probe(struct nfs_server * server)857 static void nfs3_localio_probe(struct nfs_server *server)
858 {
859 struct nfs_client *clp = server->nfs_client;
860
861 /* Throttled to reduce nfs_local_probe_async() frequency */
862 if (!nfs3_localio_probe_throttle || nfs_server_is_local(clp))
863 return;
864
865 /*
866 * Try (re)enabling LOCALIO if isn't enabled -- admin deems
867 * it worthwhile to periodically check if LOCALIO possible by
868 * setting the 'nfs3_localio_probe_throttle' module parameter.
869 *
870 * This is useful if LOCALIO was previously enabled, but was
871 * disabled due to server restart, and IO has successfully
872 * completed in terms of normal RPC.
873 */
874 if ((clp->cl_uuid.nfs3_localio_probe_count++ &
875 (nfs3_localio_probe_throttle - 1)) == 0) {
876 if (!nfs_server_is_local(clp))
877 nfs_local_probe_async(clp);
878 }
879 }
880
881 #else
nfs3_localio_probe(struct nfs_server * server)882 static void nfs3_localio_probe(struct nfs_server *server) {}
883 #endif
884
nfs3_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)885 static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
886 {
887 struct inode *inode = hdr->inode;
888 struct nfs_server *server = NFS_SERVER(inode);
889
890 if (hdr->pgio_done_cb != NULL)
891 return hdr->pgio_done_cb(task, hdr);
892
893 if (nfs3_async_handle_jukebox(task, inode))
894 return -EAGAIN;
895
896 if (task->tk_status >= 0) {
897 if (!server->read_hdrsize)
898 cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
899 nfs3_localio_probe(server);
900 }
901
902 nfs_invalidate_atime(inode);
903 nfs_refresh_inode(inode, &hdr->fattr);
904 return 0;
905 }
906
nfs3_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)907 static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
908 struct rpc_message *msg)
909 {
910 msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
911 hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
912 }
913
nfs3_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)914 static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
915 struct nfs_pgio_header *hdr)
916 {
917 rpc_call_start(task);
918 return 0;
919 }
920
nfs3_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)921 static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
922 {
923 struct inode *inode = hdr->inode;
924
925 if (hdr->pgio_done_cb != NULL)
926 return hdr->pgio_done_cb(task, hdr);
927
928 if (nfs3_async_handle_jukebox(task, inode))
929 return -EAGAIN;
930 if (task->tk_status >= 0) {
931 nfs_writeback_update_inode(hdr);
932 nfs3_localio_probe(NFS_SERVER(inode));
933 }
934 return 0;
935 }
936
nfs3_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)937 static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
938 struct rpc_message *msg,
939 struct rpc_clnt **clnt)
940 {
941 msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
942 }
943
nfs3_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)944 static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
945 {
946 rpc_call_start(task);
947 }
948
nfs3_commit_done(struct rpc_task * task,struct nfs_commit_data * data)949 static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
950 {
951 if (data->commit_done_cb != NULL)
952 return data->commit_done_cb(task, data);
953
954 if (nfs3_async_handle_jukebox(task, data->inode))
955 return -EAGAIN;
956 nfs_refresh_inode(data->inode, data->res.fattr);
957 return 0;
958 }
959
nfs3_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)960 static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
961 struct rpc_clnt **clnt)
962 {
963 msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
964 }
965
nfs3_nlm_alloc_call(void * data)966 static void nfs3_nlm_alloc_call(void *data)
967 {
968 struct nfs_lock_context *l_ctx = data;
969 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
970 get_nfs_open_context(l_ctx->open_context);
971 nfs_get_lock_context(l_ctx->open_context);
972 }
973 }
974
nfs3_nlm_unlock_prepare(struct rpc_task * task,void * data)975 static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
976 {
977 struct nfs_lock_context *l_ctx = data;
978 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
979 return nfs_async_iocounter_wait(task, l_ctx);
980 return false;
981
982 }
983
nfs3_nlm_release_call(void * data)984 static void nfs3_nlm_release_call(void *data)
985 {
986 struct nfs_lock_context *l_ctx = data;
987 struct nfs_open_context *ctx;
988 if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
989 ctx = l_ctx->open_context;
990 nfs_put_lock_context(l_ctx);
991 put_nfs_open_context(ctx);
992 }
993 }
994
995 static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
996 .nlmclnt_alloc_call = nfs3_nlm_alloc_call,
997 .nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
998 .nlmclnt_release_call = nfs3_nlm_release_call,
999 };
1000
1001 static int
nfs3_proc_lock(struct file * filp,int cmd,struct file_lock * fl)1002 nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
1003 {
1004 struct inode *inode = file_inode(filp);
1005 struct nfs_lock_context *l_ctx = NULL;
1006 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1007 int status;
1008
1009 if (fl->c.flc_flags & FL_CLOSE) {
1010 l_ctx = nfs_get_lock_context(ctx);
1011 if (IS_ERR(l_ctx))
1012 l_ctx = NULL;
1013 else
1014 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
1015 }
1016
1017 status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
1018
1019 if (l_ctx)
1020 nfs_put_lock_context(l_ctx);
1021
1022 return status;
1023 }
1024
nfs3_have_delegation(struct inode * inode,fmode_t type,int flags)1025 static int nfs3_have_delegation(struct inode *inode, fmode_t type, int flags)
1026 {
1027 return 0;
1028 }
1029
nfs3_return_delegation(struct inode * inode)1030 static int nfs3_return_delegation(struct inode *inode)
1031 {
1032 if (S_ISREG(inode->i_mode))
1033 nfs_wb_all(inode);
1034 return 0;
1035 }
1036
1037 static const struct inode_operations nfs3_dir_inode_operations = {
1038 .create = nfs_create,
1039 .atomic_open = nfs_atomic_open_v23,
1040 .lookup = nfs_lookup,
1041 .link = nfs_link,
1042 .unlink = nfs_unlink,
1043 .symlink = nfs_symlink,
1044 .mkdir = nfs_mkdir,
1045 .rmdir = nfs_rmdir,
1046 .mknod = nfs_mknod,
1047 .rename = nfs_rename,
1048 .permission = nfs_permission,
1049 .getattr = nfs_getattr,
1050 .setattr = nfs_setattr,
1051 #ifdef CONFIG_NFS_V3_ACL
1052 .listxattr = nfs3_listxattr,
1053 .get_inode_acl = nfs3_get_acl,
1054 .set_acl = nfs3_set_acl,
1055 #endif
1056 };
1057
1058 static const struct inode_operations nfs3_file_inode_operations = {
1059 .permission = nfs_permission,
1060 .getattr = nfs_getattr,
1061 .setattr = nfs_setattr,
1062 #ifdef CONFIG_NFS_V3_ACL
1063 .listxattr = nfs3_listxattr,
1064 .get_inode_acl = nfs3_get_acl,
1065 .set_acl = nfs3_set_acl,
1066 #endif
1067 };
1068
1069 const struct nfs_rpc_ops nfs_v3_clientops = {
1070 .version = 3, /* protocol version */
1071 .dentry_ops = &nfs_dentry_operations,
1072 .dir_inode_ops = &nfs3_dir_inode_operations,
1073 .file_inode_ops = &nfs3_file_inode_operations,
1074 .file_ops = &nfs_file_operations,
1075 .nlmclnt_ops = &nlmclnt_fl_close_lock_ops,
1076 .getroot = nfs3_proc_get_root,
1077 .submount = nfs_submount,
1078 .try_get_tree = nfs_try_get_tree,
1079 .getattr = nfs3_proc_getattr,
1080 .setattr = nfs3_proc_setattr,
1081 .lookup = nfs3_proc_lookup,
1082 .lookupp = nfs3_proc_lookupp,
1083 .access = nfs3_proc_access,
1084 .readlink = nfs3_proc_readlink,
1085 .create = nfs3_proc_create,
1086 .remove = nfs3_proc_remove,
1087 .unlink_setup = nfs3_proc_unlink_setup,
1088 .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1089 .unlink_done = nfs3_proc_unlink_done,
1090 .rename_setup = nfs3_proc_rename_setup,
1091 .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1092 .rename_done = nfs3_proc_rename_done,
1093 .link = nfs3_proc_link,
1094 .symlink = nfs3_proc_symlink,
1095 .mkdir = nfs3_proc_mkdir,
1096 .rmdir = nfs3_proc_rmdir,
1097 .readdir = nfs3_proc_readdir,
1098 .mknod = nfs3_proc_mknod,
1099 .statfs = nfs3_proc_statfs,
1100 .fsinfo = nfs3_proc_fsinfo,
1101 .pathconf = nfs3_proc_pathconf,
1102 .decode_dirent = nfs3_decode_dirent,
1103 .pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1104 .read_setup = nfs3_proc_read_setup,
1105 .read_done = nfs3_read_done,
1106 .write_setup = nfs3_proc_write_setup,
1107 .write_done = nfs3_write_done,
1108 .commit_setup = nfs3_proc_commit_setup,
1109 .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1110 .commit_done = nfs3_commit_done,
1111 .lock = nfs3_proc_lock,
1112 .clear_acl_cache = forget_all_cached_acls,
1113 .close_context = nfs_close_context,
1114 .have_delegation = nfs3_have_delegation,
1115 .return_delegation = nfs3_return_delegation,
1116 .alloc_client = nfs_alloc_client,
1117 .init_client = nfs_init_client,
1118 .free_client = nfs_free_client,
1119 .create_server = nfs3_create_server,
1120 .clone_server = nfs3_clone_server,
1121 };
1122