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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,struct nfs_fh * fhandle,struct nfs_fattr * fattr)195 nfs3_proc_lookup(struct inode *dir, struct dentry *dentry,
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, dentry->d_name.name,
206 				  dentry->d_name.len, fhandle, fattr,
207 				  task_flags);
208 }
209 
nfs3_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)210 static int nfs3_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
211 			     struct nfs_fattr *fattr)
212 {
213 	const char dotdot[] = "..";
214 	const size_t len = strlen(dotdot);
215 	unsigned short task_flags = 0;
216 
217 	if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
218 		task_flags |= RPC_TASK_TIMEOUT;
219 
220 	return __nfs3_proc_lookup(inode, dotdot, len, fhandle, fattr,
221 				  task_flags);
222 }
223 
nfs3_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)224 static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry,
225 			    const struct cred *cred)
226 {
227 	struct nfs3_accessargs	arg = {
228 		.fh		= NFS_FH(inode),
229 		.access		= entry->mask,
230 	};
231 	struct nfs3_accessres	res;
232 	struct rpc_message msg = {
233 		.rpc_proc	= &nfs3_procedures[NFS3PROC_ACCESS],
234 		.rpc_argp	= &arg,
235 		.rpc_resp	= &res,
236 		.rpc_cred	= cred,
237 	};
238 	int status = -ENOMEM;
239 
240 	dprintk("NFS call  access\n");
241 	res.fattr = nfs_alloc_fattr();
242 	if (res.fattr == NULL)
243 		goto out;
244 
245 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
246 	nfs_refresh_inode(inode, res.fattr);
247 	if (status == 0)
248 		nfs_access_set_mask(entry, res.access);
249 	nfs_free_fattr(res.fattr);
250 out:
251 	dprintk("NFS reply access: %d\n", status);
252 	return status;
253 }
254 
nfs3_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)255 static int nfs3_proc_readlink(struct inode *inode, struct page *page,
256 		unsigned int pgbase, unsigned int pglen)
257 {
258 	struct nfs_fattr	*fattr;
259 	struct nfs3_readlinkargs args = {
260 		.fh		= NFS_FH(inode),
261 		.pgbase		= pgbase,
262 		.pglen		= pglen,
263 		.pages		= &page
264 	};
265 	struct rpc_message msg = {
266 		.rpc_proc	= &nfs3_procedures[NFS3PROC_READLINK],
267 		.rpc_argp	= &args,
268 	};
269 	int status = -ENOMEM;
270 
271 	dprintk("NFS call  readlink\n");
272 	fattr = nfs_alloc_fattr();
273 	if (fattr == NULL)
274 		goto out;
275 	msg.rpc_resp = fattr;
276 
277 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
278 	nfs_refresh_inode(inode, fattr);
279 	nfs_free_fattr(fattr);
280 out:
281 	dprintk("NFS reply readlink: %d\n", status);
282 	return status;
283 }
284 
285 struct nfs3_createdata {
286 	struct rpc_message msg;
287 	union {
288 		struct nfs3_createargs create;
289 		struct nfs3_mkdirargs mkdir;
290 		struct nfs3_symlinkargs symlink;
291 		struct nfs3_mknodargs mknod;
292 	} arg;
293 	struct nfs3_diropres res;
294 	struct nfs_fh fh;
295 	struct nfs_fattr fattr;
296 	struct nfs_fattr dir_attr;
297 };
298 
nfs3_alloc_createdata(void)299 static struct nfs3_createdata *nfs3_alloc_createdata(void)
300 {
301 	struct nfs3_createdata *data;
302 
303 	data = kzalloc(sizeof(*data), GFP_KERNEL);
304 	if (data != NULL) {
305 		data->msg.rpc_argp = &data->arg;
306 		data->msg.rpc_resp = &data->res;
307 		data->res.fh = &data->fh;
308 		data->res.fattr = &data->fattr;
309 		data->res.dir_attr = &data->dir_attr;
310 		nfs_fattr_init(data->res.fattr);
311 		nfs_fattr_init(data->res.dir_attr);
312 	}
313 	return data;
314 }
315 
316 static struct dentry *
nfs3_do_create(struct inode * dir,struct dentry * dentry,struct nfs3_createdata * data)317 nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
318 {
319 	int status;
320 
321 	status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
322 	nfs_post_op_update_inode(dir, data->res.dir_attr);
323 	if (status != 0)
324 		return ERR_PTR(status);
325 
326 	return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr);
327 }
328 
nfs3_free_createdata(struct nfs3_createdata * data)329 static void nfs3_free_createdata(struct nfs3_createdata *data)
330 {
331 	kfree(data);
332 }
333 
334 /*
335  * Create a regular file.
336  */
337 static int
nfs3_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)338 nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
339 		 int flags)
340 {
341 	struct posix_acl *default_acl, *acl;
342 	struct nfs3_createdata *data;
343 	struct dentry *d_alias;
344 	int status = -ENOMEM;
345 
346 	dprintk("NFS call  create %pd\n", dentry);
347 
348 	data = nfs3_alloc_createdata();
349 	if (data == NULL)
350 		goto out;
351 
352 	data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
353 	data->arg.create.fh = NFS_FH(dir);
354 	data->arg.create.name = dentry->d_name.name;
355 	data->arg.create.len = dentry->d_name.len;
356 	data->arg.create.sattr = sattr;
357 
358 	data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
359 	if (flags & O_EXCL) {
360 		data->arg.create.createmode  = NFS3_CREATE_EXCLUSIVE;
361 		data->arg.create.verifier[0] = cpu_to_be32(jiffies);
362 		data->arg.create.verifier[1] = cpu_to_be32(current->pid);
363 	}
364 
365 	status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
366 	if (status)
367 		goto out;
368 
369 	for (;;) {
370 		d_alias = nfs3_do_create(dir, dentry, data);
371 		status = PTR_ERR_OR_ZERO(d_alias);
372 
373 		if (status != -ENOTSUPP)
374 			break;
375 		/* If the server doesn't support the exclusive creation
376 		 * semantics, try again with simple 'guarded' mode. */
377 		switch (data->arg.create.createmode) {
378 			case NFS3_CREATE_EXCLUSIVE:
379 				data->arg.create.createmode = NFS3_CREATE_GUARDED;
380 				break;
381 
382 			case NFS3_CREATE_GUARDED:
383 				data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
384 				break;
385 
386 			case NFS3_CREATE_UNCHECKED:
387 				goto out_release_acls;
388 		}
389 		nfs_fattr_init(data->res.dir_attr);
390 		nfs_fattr_init(data->res.fattr);
391 	}
392 
393 	if (status != 0)
394 		goto out_release_acls;
395 
396 	if (d_alias)
397 		dentry = d_alias;
398 
399 	/* When we created the file with exclusive semantics, make
400 	 * sure we set the attributes afterwards. */
401 	if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
402 		dprintk("NFS call  setattr (post-create)\n");
403 
404 		if (!(sattr->ia_valid & ATTR_ATIME_SET))
405 			sattr->ia_valid |= ATTR_ATIME;
406 		if (!(sattr->ia_valid & ATTR_MTIME_SET))
407 			sattr->ia_valid |= ATTR_MTIME;
408 
409 		/* Note: we could use a guarded setattr here, but I'm
410 		 * not sure this buys us anything (and I'd have
411 		 * to revamp the NFSv3 XDR code) */
412 		status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
413 		nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
414 		dprintk("NFS reply setattr (post-create): %d\n", status);
415 		if (status != 0)
416 			goto out_dput;
417 	}
418 
419 	status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
420 
421 out_dput:
422 	dput(d_alias);
423 out_release_acls:
424 	posix_acl_release(acl);
425 	posix_acl_release(default_acl);
426 out:
427 	nfs3_free_createdata(data);
428 	dprintk("NFS reply create: %d\n", status);
429 	return status;
430 }
431 
432 static int
nfs3_proc_remove(struct inode * dir,struct dentry * dentry)433 nfs3_proc_remove(struct inode *dir, struct dentry *dentry)
434 {
435 	struct nfs_removeargs arg = {
436 		.fh = NFS_FH(dir),
437 		.name = dentry->d_name,
438 	};
439 	struct nfs_removeres res;
440 	struct rpc_message msg = {
441 		.rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
442 		.rpc_argp = &arg,
443 		.rpc_resp = &res,
444 	};
445 	int status = -ENOMEM;
446 
447 	dprintk("NFS call  remove %pd2\n", dentry);
448 	res.dir_attr = nfs_alloc_fattr();
449 	if (res.dir_attr == NULL)
450 		goto out;
451 
452 	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
453 	nfs_post_op_update_inode(dir, res.dir_attr);
454 	nfs_free_fattr(res.dir_attr);
455 out:
456 	dprintk("NFS reply remove: %d\n", status);
457 	return status;
458 }
459 
460 static void
nfs3_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)461 nfs3_proc_unlink_setup(struct rpc_message *msg,
462 		struct dentry *dentry,
463 		struct inode *inode)
464 {
465 	msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
466 }
467 
nfs3_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)468 static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
469 {
470 	rpc_call_start(task);
471 }
472 
473 static int
nfs3_proc_unlink_done(struct rpc_task * task,struct inode * dir)474 nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
475 {
476 	struct nfs_removeres *res;
477 	if (nfs3_async_handle_jukebox(task, dir))
478 		return 0;
479 	res = task->tk_msg.rpc_resp;
480 	nfs_post_op_update_inode(dir, res->dir_attr);
481 	return 1;
482 }
483 
484 static void
nfs3_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)485 nfs3_proc_rename_setup(struct rpc_message *msg,
486 		struct dentry *old_dentry,
487 		struct dentry *new_dentry)
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 page * page,unsigned int len,struct iattr * sattr)546 nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
547 		  unsigned int len, struct iattr *sattr)
548 {
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 
nfs3_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)846 static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
847 {
848 	struct inode *inode = hdr->inode;
849 	struct nfs_server *server = NFS_SERVER(inode);
850 
851 	if (hdr->pgio_done_cb != NULL)
852 		return hdr->pgio_done_cb(task, hdr);
853 
854 	if (nfs3_async_handle_jukebox(task, inode))
855 		return -EAGAIN;
856 
857 	if (task->tk_status >= 0 && !server->read_hdrsize)
858 		cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
859 
860 	nfs_invalidate_atime(inode);
861 	nfs_refresh_inode(inode, &hdr->fattr);
862 	return 0;
863 }
864 
nfs3_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)865 static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
866 				 struct rpc_message *msg)
867 {
868 	msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
869 	hdr->args.replen = NFS_SERVER(hdr->inode)->read_hdrsize;
870 }
871 
nfs3_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)872 static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
873 				      struct nfs_pgio_header *hdr)
874 {
875 	rpc_call_start(task);
876 	return 0;
877 }
878 
nfs3_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)879 static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
880 {
881 	struct inode *inode = hdr->inode;
882 
883 	if (hdr->pgio_done_cb != NULL)
884 		return hdr->pgio_done_cb(task, hdr);
885 
886 	if (nfs3_async_handle_jukebox(task, inode))
887 		return -EAGAIN;
888 	if (task->tk_status >= 0)
889 		nfs_writeback_update_inode(hdr);
890 	return 0;
891 }
892 
nfs3_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)893 static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
894 				  struct rpc_message *msg,
895 				  struct rpc_clnt **clnt)
896 {
897 	msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
898 }
899 
nfs3_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)900 static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
901 {
902 	rpc_call_start(task);
903 }
904 
nfs3_commit_done(struct rpc_task * task,struct nfs_commit_data * data)905 static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
906 {
907 	if (data->commit_done_cb != NULL)
908 		return data->commit_done_cb(task, data);
909 
910 	if (nfs3_async_handle_jukebox(task, data->inode))
911 		return -EAGAIN;
912 	nfs_refresh_inode(data->inode, data->res.fattr);
913 	return 0;
914 }
915 
nfs3_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)916 static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
917 				   struct rpc_clnt **clnt)
918 {
919 	msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
920 }
921 
nfs3_nlm_alloc_call(void * data)922 static void nfs3_nlm_alloc_call(void *data)
923 {
924 	struct nfs_lock_context *l_ctx = data;
925 	if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
926 		get_nfs_open_context(l_ctx->open_context);
927 		nfs_get_lock_context(l_ctx->open_context);
928 	}
929 }
930 
nfs3_nlm_unlock_prepare(struct rpc_task * task,void * data)931 static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
932 {
933 	struct nfs_lock_context *l_ctx = data;
934 	if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
935 		return nfs_async_iocounter_wait(task, l_ctx);
936 	return false;
937 
938 }
939 
nfs3_nlm_release_call(void * data)940 static void nfs3_nlm_release_call(void *data)
941 {
942 	struct nfs_lock_context *l_ctx = data;
943 	struct nfs_open_context *ctx;
944 	if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
945 		ctx = l_ctx->open_context;
946 		nfs_put_lock_context(l_ctx);
947 		put_nfs_open_context(ctx);
948 	}
949 }
950 
951 static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
952 	.nlmclnt_alloc_call = nfs3_nlm_alloc_call,
953 	.nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
954 	.nlmclnt_release_call = nfs3_nlm_release_call,
955 };
956 
957 static int
nfs3_proc_lock(struct file * filp,int cmd,struct file_lock * fl)958 nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
959 {
960 	struct inode *inode = file_inode(filp);
961 	struct nfs_lock_context *l_ctx = NULL;
962 	struct nfs_open_context *ctx = nfs_file_open_context(filp);
963 	int status;
964 
965 	if (fl->fl_flags & FL_CLOSE) {
966 		l_ctx = nfs_get_lock_context(ctx);
967 		if (IS_ERR(l_ctx))
968 			l_ctx = NULL;
969 		else
970 			set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
971 	}
972 
973 	status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
974 
975 	if (l_ctx)
976 		nfs_put_lock_context(l_ctx);
977 
978 	return status;
979 }
980 
nfs3_have_delegation(struct inode * inode,fmode_t flags)981 static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
982 {
983 	return 0;
984 }
985 
986 static const struct inode_operations nfs3_dir_inode_operations = {
987 	.create		= nfs_create,
988 	.lookup		= nfs_lookup,
989 	.link		= nfs_link,
990 	.unlink		= nfs_unlink,
991 	.symlink	= nfs_symlink,
992 	.mkdir		= nfs_mkdir,
993 	.rmdir		= nfs_rmdir,
994 	.mknod		= nfs_mknod,
995 	.rename		= nfs_rename,
996 	.permission	= nfs_permission,
997 	.getattr	= nfs_getattr,
998 	.setattr	= nfs_setattr,
999 #ifdef CONFIG_NFS_V3_ACL
1000 	.listxattr	= nfs3_listxattr,
1001 	.get_acl	= nfs3_get_acl,
1002 	.set_acl	= nfs3_set_acl,
1003 #endif
1004 };
1005 
1006 static const struct inode_operations nfs3_file_inode_operations = {
1007 	.permission	= nfs_permission,
1008 	.getattr	= nfs_getattr,
1009 	.setattr	= nfs_setattr,
1010 #ifdef CONFIG_NFS_V3_ACL
1011 	.listxattr	= nfs3_listxattr,
1012 	.get_acl	= nfs3_get_acl,
1013 	.set_acl	= nfs3_set_acl,
1014 #endif
1015 };
1016 
1017 const struct nfs_rpc_ops nfs_v3_clientops = {
1018 	.version	= 3,			/* protocol version */
1019 	.dentry_ops	= &nfs_dentry_operations,
1020 	.dir_inode_ops	= &nfs3_dir_inode_operations,
1021 	.file_inode_ops	= &nfs3_file_inode_operations,
1022 	.file_ops	= &nfs_file_operations,
1023 	.nlmclnt_ops	= &nlmclnt_fl_close_lock_ops,
1024 	.getroot	= nfs3_proc_get_root,
1025 	.submount	= nfs_submount,
1026 	.try_get_tree	= nfs_try_get_tree,
1027 	.getattr	= nfs3_proc_getattr,
1028 	.setattr	= nfs3_proc_setattr,
1029 	.lookup		= nfs3_proc_lookup,
1030 	.lookupp	= nfs3_proc_lookupp,
1031 	.access		= nfs3_proc_access,
1032 	.readlink	= nfs3_proc_readlink,
1033 	.create		= nfs3_proc_create,
1034 	.remove		= nfs3_proc_remove,
1035 	.unlink_setup	= nfs3_proc_unlink_setup,
1036 	.unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
1037 	.unlink_done	= nfs3_proc_unlink_done,
1038 	.rename_setup	= nfs3_proc_rename_setup,
1039 	.rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
1040 	.rename_done	= nfs3_proc_rename_done,
1041 	.link		= nfs3_proc_link,
1042 	.symlink	= nfs3_proc_symlink,
1043 	.mkdir		= nfs3_proc_mkdir,
1044 	.rmdir		= nfs3_proc_rmdir,
1045 	.readdir	= nfs3_proc_readdir,
1046 	.mknod		= nfs3_proc_mknod,
1047 	.statfs		= nfs3_proc_statfs,
1048 	.fsinfo		= nfs3_proc_fsinfo,
1049 	.pathconf	= nfs3_proc_pathconf,
1050 	.decode_dirent	= nfs3_decode_dirent,
1051 	.pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
1052 	.read_setup	= nfs3_proc_read_setup,
1053 	.read_done	= nfs3_read_done,
1054 	.write_setup	= nfs3_proc_write_setup,
1055 	.write_done	= nfs3_write_done,
1056 	.commit_setup	= nfs3_proc_commit_setup,
1057 	.commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
1058 	.commit_done	= nfs3_commit_done,
1059 	.lock		= nfs3_proc_lock,
1060 	.clear_acl_cache = forget_all_cached_acls,
1061 	.close_context	= nfs_close_context,
1062 	.have_delegation = nfs3_have_delegation,
1063 	.alloc_client	= nfs_alloc_client,
1064 	.init_client	= nfs_init_client,
1065 	.free_client	= nfs_free_client,
1066 	.create_server	= nfs3_create_server,
1067 	.clone_server	= nfs3_clone_server,
1068 };
1069