xref: /openbmc/linux/fs/nfsd/nfs3proc.c (revision a332018a)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Process version 3 NFS requests.
4  *
5  * Copyright (C) 1996, 1997, 1998 Olaf Kirch <okir@monad.swb.de>
6  */
7 
8 #include <linux/fs.h>
9 #include <linux/ext2_fs.h>
10 #include <linux/magic.h>
11 #include <linux/namei.h>
12 
13 #include "cache.h"
14 #include "xdr3.h"
15 #include "vfs.h"
16 #include "filecache.h"
17 
18 #define NFSDDBG_FACILITY		NFSDDBG_PROC
19 
20 static int	nfs3_ftypes[] = {
21 	0,			/* NF3NON */
22 	S_IFREG,		/* NF3REG */
23 	S_IFDIR,		/* NF3DIR */
24 	S_IFBLK,		/* NF3BLK */
25 	S_IFCHR,		/* NF3CHR */
26 	S_IFLNK,		/* NF3LNK */
27 	S_IFSOCK,		/* NF3SOCK */
28 	S_IFIFO,		/* NF3FIFO */
29 };
30 
31 /*
32  * NULL call.
33  */
34 static __be32
nfsd3_proc_null(struct svc_rqst * rqstp)35 nfsd3_proc_null(struct svc_rqst *rqstp)
36 {
37 	return rpc_success;
38 }
39 
40 /*
41  * Get a file's attributes
42  */
43 static __be32
nfsd3_proc_getattr(struct svc_rqst * rqstp)44 nfsd3_proc_getattr(struct svc_rqst *rqstp)
45 {
46 	struct nfsd_fhandle *argp = rqstp->rq_argp;
47 	struct nfsd3_attrstat *resp = rqstp->rq_resp;
48 
49 	dprintk("nfsd: GETATTR(3)  %s\n",
50 		SVCFH_fmt(&argp->fh));
51 
52 	fh_copy(&resp->fh, &argp->fh);
53 	resp->status = fh_verify(rqstp, &resp->fh, 0,
54 				 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
55 	if (resp->status != nfs_ok)
56 		goto out;
57 
58 	resp->status = fh_getattr(&resp->fh, &resp->stat);
59 out:
60 	return rpc_success;
61 }
62 
63 /*
64  * Set a file's attributes
65  */
66 static __be32
nfsd3_proc_setattr(struct svc_rqst * rqstp)67 nfsd3_proc_setattr(struct svc_rqst *rqstp)
68 {
69 	struct nfsd3_sattrargs *argp = rqstp->rq_argp;
70 	struct nfsd3_attrstat *resp = rqstp->rq_resp;
71 	struct nfsd_attrs attrs = {
72 		.na_iattr	= &argp->attrs,
73 	};
74 
75 	dprintk("nfsd: SETATTR(3)  %s\n",
76 				SVCFH_fmt(&argp->fh));
77 
78 	fh_copy(&resp->fh, &argp->fh);
79 	resp->status = nfsd_setattr(rqstp, &resp->fh, &attrs,
80 				    argp->check_guard, argp->guardtime);
81 	return rpc_success;
82 }
83 
84 /*
85  * Look up a path name component
86  */
87 static __be32
nfsd3_proc_lookup(struct svc_rqst * rqstp)88 nfsd3_proc_lookup(struct svc_rqst *rqstp)
89 {
90 	struct nfsd3_diropargs *argp = rqstp->rq_argp;
91 	struct nfsd3_diropres  *resp = rqstp->rq_resp;
92 
93 	dprintk("nfsd: LOOKUP(3)   %s %.*s\n",
94 				SVCFH_fmt(&argp->fh),
95 				argp->len,
96 				argp->name);
97 
98 	fh_copy(&resp->dirfh, &argp->fh);
99 	fh_init(&resp->fh, NFS3_FHSIZE);
100 
101 	resp->status = nfsd_lookup(rqstp, &resp->dirfh,
102 				   argp->name, argp->len,
103 				   &resp->fh);
104 	return rpc_success;
105 }
106 
107 /*
108  * Check file access
109  */
110 static __be32
nfsd3_proc_access(struct svc_rqst * rqstp)111 nfsd3_proc_access(struct svc_rqst *rqstp)
112 {
113 	struct nfsd3_accessargs *argp = rqstp->rq_argp;
114 	struct nfsd3_accessres *resp = rqstp->rq_resp;
115 
116 	dprintk("nfsd: ACCESS(3)   %s 0x%x\n",
117 				SVCFH_fmt(&argp->fh),
118 				argp->access);
119 
120 	fh_copy(&resp->fh, &argp->fh);
121 	resp->access = argp->access;
122 	resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
123 	return rpc_success;
124 }
125 
126 /*
127  * Read a symlink.
128  */
129 static __be32
nfsd3_proc_readlink(struct svc_rqst * rqstp)130 nfsd3_proc_readlink(struct svc_rqst *rqstp)
131 {
132 	struct nfsd_fhandle *argp = rqstp->rq_argp;
133 	struct nfsd3_readlinkres *resp = rqstp->rq_resp;
134 
135 	dprintk("nfsd: READLINK(3) %s\n", SVCFH_fmt(&argp->fh));
136 
137 	/* Read the symlink. */
138 	fh_copy(&resp->fh, &argp->fh);
139 	resp->len = NFS3_MAXPATHLEN;
140 	resp->pages = rqstp->rq_next_page++;
141 	resp->status = nfsd_readlink(rqstp, &resp->fh,
142 				     page_address(*resp->pages), &resp->len);
143 	return rpc_success;
144 }
145 
146 /*
147  * Read a portion of a file.
148  */
149 static __be32
nfsd3_proc_read(struct svc_rqst * rqstp)150 nfsd3_proc_read(struct svc_rqst *rqstp)
151 {
152 	struct nfsd3_readargs *argp = rqstp->rq_argp;
153 	struct nfsd3_readres *resp = rqstp->rq_resp;
154 
155 	dprintk("nfsd: READ(3) %s %lu bytes at %Lu\n",
156 				SVCFH_fmt(&argp->fh),
157 				(unsigned long) argp->count,
158 				(unsigned long long) argp->offset);
159 
160 	argp->count = min_t(u32, argp->count, svc_max_payload(rqstp));
161 	argp->count = min_t(u32, argp->count, rqstp->rq_res.buflen);
162 	if (argp->offset > (u64)OFFSET_MAX)
163 		argp->offset = (u64)OFFSET_MAX;
164 	if (argp->offset + argp->count > (u64)OFFSET_MAX)
165 		argp->count = (u64)OFFSET_MAX - argp->offset;
166 
167 	resp->pages = rqstp->rq_next_page;
168 
169 	/* Obtain buffer pointer for payload.
170 	 * 1 (status) + 22 (post_op_attr) + 1 (count) + 1 (eof)
171 	 * + 1 (xdr opaque byte count) = 26
172 	 */
173 	resp->count = argp->count;
174 	svc_reserve_auth(rqstp, ((1 + NFS3_POST_OP_ATTR_WORDS + 3)<<2) + resp->count +4);
175 
176 	fh_copy(&resp->fh, &argp->fh);
177 	resp->status = nfsd_read(rqstp, &resp->fh, argp->offset,
178 				 &resp->count, &resp->eof);
179 	return rpc_success;
180 }
181 
182 /*
183  * Write data to a file
184  */
185 static __be32
nfsd3_proc_write(struct svc_rqst * rqstp)186 nfsd3_proc_write(struct svc_rqst *rqstp)
187 {
188 	struct nfsd3_writeargs *argp = rqstp->rq_argp;
189 	struct nfsd3_writeres *resp = rqstp->rq_resp;
190 	unsigned long cnt = argp->len;
191 	unsigned int nvecs;
192 
193 	dprintk("nfsd: WRITE(3)    %s %d bytes at %Lu%s\n",
194 				SVCFH_fmt(&argp->fh),
195 				argp->len,
196 				(unsigned long long) argp->offset,
197 				argp->stable? " stable" : "");
198 
199 	resp->status = nfserr_fbig;
200 	if (argp->offset > (u64)OFFSET_MAX ||
201 	    argp->offset + argp->len > (u64)OFFSET_MAX)
202 		return rpc_success;
203 
204 	fh_copy(&resp->fh, &argp->fh);
205 	resp->committed = argp->stable;
206 	nvecs = svc_fill_write_vector(rqstp, &argp->payload);
207 
208 	resp->status = nfsd_write(rqstp, &resp->fh, argp->offset,
209 				  rqstp->rq_vec, nvecs, &cnt,
210 				  resp->committed, resp->verf);
211 	resp->count = cnt;
212 	return rpc_success;
213 }
214 
215 /*
216  * Implement NFSv3's unchecked, guarded, and exclusive CREATE
217  * semantics for regular files. Except for the created file,
218  * this operation is stateless on the server.
219  *
220  * Upon return, caller must release @fhp and @resfhp.
221  */
222 static __be32
nfsd3_create_file(struct svc_rqst * rqstp,struct svc_fh * fhp,struct svc_fh * resfhp,struct nfsd3_createargs * argp)223 nfsd3_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
224 		  struct svc_fh *resfhp, struct nfsd3_createargs *argp)
225 {
226 	struct iattr *iap = &argp->attrs;
227 	struct dentry *parent, *child;
228 	struct nfsd_attrs attrs = {
229 		.na_iattr	= iap,
230 	};
231 	__u32 v_mtime, v_atime;
232 	struct inode *inode;
233 	__be32 status;
234 	int host_err;
235 
236 	if (isdotent(argp->name, argp->len))
237 		return nfserr_exist;
238 	if (!(iap->ia_valid & ATTR_MODE))
239 		iap->ia_mode = 0;
240 
241 	status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
242 	if (status != nfs_ok)
243 		return status;
244 
245 	parent = fhp->fh_dentry;
246 	inode = d_inode(parent);
247 
248 	host_err = fh_want_write(fhp);
249 	if (host_err)
250 		return nfserrno(host_err);
251 
252 	inode_lock_nested(inode, I_MUTEX_PARENT);
253 
254 	child = lookup_one_len(argp->name, parent, argp->len);
255 	if (IS_ERR(child)) {
256 		status = nfserrno(PTR_ERR(child));
257 		goto out;
258 	}
259 
260 	if (d_really_is_negative(child)) {
261 		status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
262 		if (status != nfs_ok)
263 			goto out;
264 	}
265 
266 	status = fh_compose(resfhp, fhp->fh_export, child, fhp);
267 	if (status != nfs_ok)
268 		goto out;
269 
270 	v_mtime = 0;
271 	v_atime = 0;
272 	if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
273 		u32 *verifier = (u32 *)argp->verf;
274 
275 		/*
276 		 * Solaris 7 gets confused (bugid 4218508) if these have
277 		 * the high bit set, as do xfs filesystems without the
278 		 * "bigtime" feature. So just clear the high bits.
279 		 */
280 		v_mtime = verifier[0] & 0x7fffffff;
281 		v_atime = verifier[1] & 0x7fffffff;
282 	}
283 
284 	if (d_really_is_positive(child)) {
285 		status = nfs_ok;
286 
287 		switch (argp->createmode) {
288 		case NFS3_CREATE_UNCHECKED:
289 			if (!d_is_reg(child))
290 				break;
291 			iap->ia_valid &= ATTR_SIZE;
292 			goto set_attr;
293 		case NFS3_CREATE_GUARDED:
294 			status = nfserr_exist;
295 			break;
296 		case NFS3_CREATE_EXCLUSIVE:
297 			if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
298 			    d_inode(child)->i_atime.tv_sec == v_atime &&
299 			    d_inode(child)->i_size == 0) {
300 				break;
301 			}
302 			status = nfserr_exist;
303 		}
304 		goto out;
305 	}
306 
307 	if (!IS_POSIXACL(inode))
308 		iap->ia_mode &= ~current_umask();
309 
310 	status = fh_fill_pre_attrs(fhp);
311 	if (status != nfs_ok)
312 		goto out;
313 	host_err = vfs_create(&nop_mnt_idmap, inode, child, iap->ia_mode, true);
314 	if (host_err < 0) {
315 		status = nfserrno(host_err);
316 		goto out;
317 	}
318 	fh_fill_post_attrs(fhp);
319 
320 	/* A newly created file already has a file size of zero. */
321 	if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
322 		iap->ia_valid &= ~ATTR_SIZE;
323 	if (argp->createmode == NFS3_CREATE_EXCLUSIVE) {
324 		iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
325 				ATTR_MTIME_SET | ATTR_ATIME_SET;
326 		iap->ia_mtime.tv_sec = v_mtime;
327 		iap->ia_atime.tv_sec = v_atime;
328 		iap->ia_mtime.tv_nsec = 0;
329 		iap->ia_atime.tv_nsec = 0;
330 	}
331 
332 set_attr:
333 	status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs);
334 
335 out:
336 	inode_unlock(inode);
337 	if (child && !IS_ERR(child))
338 		dput(child);
339 	fh_drop_write(fhp);
340 	return status;
341 }
342 
343 static __be32
nfsd3_proc_create(struct svc_rqst * rqstp)344 nfsd3_proc_create(struct svc_rqst *rqstp)
345 {
346 	struct nfsd3_createargs *argp = rqstp->rq_argp;
347 	struct nfsd3_diropres *resp = rqstp->rq_resp;
348 	svc_fh *dirfhp, *newfhp;
349 
350 	dprintk("nfsd: CREATE(3)   %s %.*s\n",
351 				SVCFH_fmt(&argp->fh),
352 				argp->len,
353 				argp->name);
354 
355 	dirfhp = fh_copy(&resp->dirfh, &argp->fh);
356 	newfhp = fh_init(&resp->fh, NFS3_FHSIZE);
357 
358 	resp->status = nfsd3_create_file(rqstp, dirfhp, newfhp, argp);
359 	return rpc_success;
360 }
361 
362 /*
363  * Make directory. This operation is not idempotent.
364  */
365 static __be32
nfsd3_proc_mkdir(struct svc_rqst * rqstp)366 nfsd3_proc_mkdir(struct svc_rqst *rqstp)
367 {
368 	struct nfsd3_createargs *argp = rqstp->rq_argp;
369 	struct nfsd3_diropres *resp = rqstp->rq_resp;
370 	struct nfsd_attrs attrs = {
371 		.na_iattr	= &argp->attrs,
372 	};
373 
374 	dprintk("nfsd: MKDIR(3)    %s %.*s\n",
375 				SVCFH_fmt(&argp->fh),
376 				argp->len,
377 				argp->name);
378 
379 	argp->attrs.ia_valid &= ~ATTR_SIZE;
380 	fh_copy(&resp->dirfh, &argp->fh);
381 	fh_init(&resp->fh, NFS3_FHSIZE);
382 	resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
383 				   &attrs, S_IFDIR, 0, &resp->fh);
384 	return rpc_success;
385 }
386 
387 static __be32
nfsd3_proc_symlink(struct svc_rqst * rqstp)388 nfsd3_proc_symlink(struct svc_rqst *rqstp)
389 {
390 	struct nfsd3_symlinkargs *argp = rqstp->rq_argp;
391 	struct nfsd3_diropres *resp = rqstp->rq_resp;
392 	struct nfsd_attrs attrs = {
393 		.na_iattr	= &argp->attrs,
394 	};
395 
396 	if (argp->tlen == 0) {
397 		resp->status = nfserr_inval;
398 		goto out;
399 	}
400 	if (argp->tlen > NFS3_MAXPATHLEN) {
401 		resp->status = nfserr_nametoolong;
402 		goto out;
403 	}
404 
405 	argp->tname = svc_fill_symlink_pathname(rqstp, &argp->first,
406 						page_address(rqstp->rq_arg.pages[0]),
407 						argp->tlen);
408 	if (IS_ERR(argp->tname)) {
409 		resp->status = nfserrno(PTR_ERR(argp->tname));
410 		goto out;
411 	}
412 
413 	dprintk("nfsd: SYMLINK(3)  %s %.*s -> %.*s\n",
414 				SVCFH_fmt(&argp->ffh),
415 				argp->flen, argp->fname,
416 				argp->tlen, argp->tname);
417 
418 	fh_copy(&resp->dirfh, &argp->ffh);
419 	fh_init(&resp->fh, NFS3_FHSIZE);
420 	resp->status = nfsd_symlink(rqstp, &resp->dirfh, argp->fname,
421 				    argp->flen, argp->tname, &attrs, &resp->fh);
422 	kfree(argp->tname);
423 out:
424 	return rpc_success;
425 }
426 
427 /*
428  * Make socket/fifo/device.
429  */
430 static __be32
nfsd3_proc_mknod(struct svc_rqst * rqstp)431 nfsd3_proc_mknod(struct svc_rqst *rqstp)
432 {
433 	struct nfsd3_mknodargs *argp = rqstp->rq_argp;
434 	struct nfsd3_diropres  *resp = rqstp->rq_resp;
435 	struct nfsd_attrs attrs = {
436 		.na_iattr	= &argp->attrs,
437 	};
438 	int type;
439 	dev_t	rdev = 0;
440 
441 	dprintk("nfsd: MKNOD(3)    %s %.*s\n",
442 				SVCFH_fmt(&argp->fh),
443 				argp->len,
444 				argp->name);
445 
446 	fh_copy(&resp->dirfh, &argp->fh);
447 	fh_init(&resp->fh, NFS3_FHSIZE);
448 
449 	if (argp->ftype == NF3CHR || argp->ftype == NF3BLK) {
450 		rdev = MKDEV(argp->major, argp->minor);
451 		if (MAJOR(rdev) != argp->major ||
452 		    MINOR(rdev) != argp->minor) {
453 			resp->status = nfserr_inval;
454 			goto out;
455 		}
456 	} else if (argp->ftype != NF3SOCK && argp->ftype != NF3FIFO) {
457 		resp->status = nfserr_badtype;
458 		goto out;
459 	}
460 
461 	type = nfs3_ftypes[argp->ftype];
462 	resp->status = nfsd_create(rqstp, &resp->dirfh, argp->name, argp->len,
463 				   &attrs, type, rdev, &resp->fh);
464 out:
465 	return rpc_success;
466 }
467 
468 /*
469  * Remove file/fifo/socket etc.
470  */
471 static __be32
nfsd3_proc_remove(struct svc_rqst * rqstp)472 nfsd3_proc_remove(struct svc_rqst *rqstp)
473 {
474 	struct nfsd3_diropargs *argp = rqstp->rq_argp;
475 	struct nfsd3_attrstat *resp = rqstp->rq_resp;
476 
477 	dprintk("nfsd: REMOVE(3)   %s %.*s\n",
478 				SVCFH_fmt(&argp->fh),
479 				argp->len,
480 				argp->name);
481 
482 	/* Unlink. -S_IFDIR means file must not be a directory */
483 	fh_copy(&resp->fh, &argp->fh);
484 	resp->status = nfsd_unlink(rqstp, &resp->fh, -S_IFDIR,
485 				   argp->name, argp->len);
486 	return rpc_success;
487 }
488 
489 /*
490  * Remove a directory
491  */
492 static __be32
nfsd3_proc_rmdir(struct svc_rqst * rqstp)493 nfsd3_proc_rmdir(struct svc_rqst *rqstp)
494 {
495 	struct nfsd3_diropargs *argp = rqstp->rq_argp;
496 	struct nfsd3_attrstat *resp = rqstp->rq_resp;
497 
498 	dprintk("nfsd: RMDIR(3)    %s %.*s\n",
499 				SVCFH_fmt(&argp->fh),
500 				argp->len,
501 				argp->name);
502 
503 	fh_copy(&resp->fh, &argp->fh);
504 	resp->status = nfsd_unlink(rqstp, &resp->fh, S_IFDIR,
505 				   argp->name, argp->len);
506 	return rpc_success;
507 }
508 
509 static __be32
nfsd3_proc_rename(struct svc_rqst * rqstp)510 nfsd3_proc_rename(struct svc_rqst *rqstp)
511 {
512 	struct nfsd3_renameargs *argp = rqstp->rq_argp;
513 	struct nfsd3_renameres *resp = rqstp->rq_resp;
514 
515 	dprintk("nfsd: RENAME(3)   %s %.*s ->\n",
516 				SVCFH_fmt(&argp->ffh),
517 				argp->flen,
518 				argp->fname);
519 	dprintk("nfsd: -> %s %.*s\n",
520 				SVCFH_fmt(&argp->tfh),
521 				argp->tlen,
522 				argp->tname);
523 
524 	fh_copy(&resp->ffh, &argp->ffh);
525 	fh_copy(&resp->tfh, &argp->tfh);
526 	resp->status = nfsd_rename(rqstp, &resp->ffh, argp->fname, argp->flen,
527 				   &resp->tfh, argp->tname, argp->tlen);
528 	return rpc_success;
529 }
530 
531 static __be32
nfsd3_proc_link(struct svc_rqst * rqstp)532 nfsd3_proc_link(struct svc_rqst *rqstp)
533 {
534 	struct nfsd3_linkargs *argp = rqstp->rq_argp;
535 	struct nfsd3_linkres  *resp = rqstp->rq_resp;
536 
537 	dprintk("nfsd: LINK(3)     %s ->\n",
538 				SVCFH_fmt(&argp->ffh));
539 	dprintk("nfsd:   -> %s %.*s\n",
540 				SVCFH_fmt(&argp->tfh),
541 				argp->tlen,
542 				argp->tname);
543 
544 	fh_copy(&resp->fh,  &argp->ffh);
545 	fh_copy(&resp->tfh, &argp->tfh);
546 	resp->status = nfsd_link(rqstp, &resp->tfh, argp->tname, argp->tlen,
547 				 &resp->fh);
548 	return rpc_success;
549 }
550 
nfsd3_init_dirlist_pages(struct svc_rqst * rqstp,struct nfsd3_readdirres * resp,u32 count)551 static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp,
552 				     struct nfsd3_readdirres *resp,
553 				     u32 count)
554 {
555 	struct xdr_buf *buf = &resp->dirlist;
556 	struct xdr_stream *xdr = &resp->xdr;
557 	unsigned int sendbuf = min_t(unsigned int, rqstp->rq_res.buflen,
558 				     svc_max_payload(rqstp));
559 
560 	memset(buf, 0, sizeof(*buf));
561 
562 	/* Reserve room for the NULL ptr & eof flag (-2 words) */
563 	buf->buflen = clamp(count, (u32)(XDR_UNIT * 2), sendbuf);
564 	buf->buflen -= XDR_UNIT * 2;
565 	buf->pages = rqstp->rq_next_page;
566 	rqstp->rq_next_page += (buf->buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
567 
568 	xdr_init_encode_pages(xdr, buf, buf->pages,  NULL);
569 }
570 
571 /*
572  * Read a portion of a directory.
573  */
574 static __be32
nfsd3_proc_readdir(struct svc_rqst * rqstp)575 nfsd3_proc_readdir(struct svc_rqst *rqstp)
576 {
577 	struct nfsd3_readdirargs *argp = rqstp->rq_argp;
578 	struct nfsd3_readdirres  *resp = rqstp->rq_resp;
579 	loff_t		offset;
580 
581 	dprintk("nfsd: READDIR(3)  %s %d bytes at %d\n",
582 				SVCFH_fmt(&argp->fh),
583 				argp->count, (u32) argp->cookie);
584 
585 	nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
586 
587 	fh_copy(&resp->fh, &argp->fh);
588 	resp->common.err = nfs_ok;
589 	resp->cookie_offset = 0;
590 	resp->rqstp = rqstp;
591 	offset = argp->cookie;
592 	resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
593 				    &resp->common, nfs3svc_encode_entry3);
594 	memcpy(resp->verf, argp->verf, 8);
595 	nfs3svc_encode_cookie3(resp, offset);
596 
597 	/* Recycle only pages that were part of the reply */
598 	rqstp->rq_next_page = resp->xdr.page_ptr + 1;
599 
600 	return rpc_success;
601 }
602 
603 /*
604  * Read a portion of a directory, including file handles and attrs.
605  * For now, we choose to ignore the dircount parameter.
606  */
607 static __be32
nfsd3_proc_readdirplus(struct svc_rqst * rqstp)608 nfsd3_proc_readdirplus(struct svc_rqst *rqstp)
609 {
610 	struct nfsd3_readdirargs *argp = rqstp->rq_argp;
611 	struct nfsd3_readdirres  *resp = rqstp->rq_resp;
612 	loff_t	offset;
613 
614 	dprintk("nfsd: READDIR+(3) %s %d bytes at %d\n",
615 				SVCFH_fmt(&argp->fh),
616 				argp->count, (u32) argp->cookie);
617 
618 	nfsd3_init_dirlist_pages(rqstp, resp, argp->count);
619 
620 	fh_copy(&resp->fh, &argp->fh);
621 	resp->common.err = nfs_ok;
622 	resp->cookie_offset = 0;
623 	resp->rqstp = rqstp;
624 	offset = argp->cookie;
625 
626 	resp->status = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
627 	if (resp->status != nfs_ok)
628 		goto out;
629 
630 	if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS) {
631 		resp->status = nfserr_notsupp;
632 		goto out;
633 	}
634 
635 	resp->status = nfsd_readdir(rqstp, &resp->fh, &offset,
636 				    &resp->common, nfs3svc_encode_entryplus3);
637 	memcpy(resp->verf, argp->verf, 8);
638 	nfs3svc_encode_cookie3(resp, offset);
639 
640 	/* Recycle only pages that were part of the reply */
641 	rqstp->rq_next_page = resp->xdr.page_ptr + 1;
642 
643 out:
644 	return rpc_success;
645 }
646 
647 /*
648  * Get file system stats
649  */
650 static __be32
nfsd3_proc_fsstat(struct svc_rqst * rqstp)651 nfsd3_proc_fsstat(struct svc_rqst *rqstp)
652 {
653 	struct nfsd_fhandle *argp = rqstp->rq_argp;
654 	struct nfsd3_fsstatres *resp = rqstp->rq_resp;
655 
656 	dprintk("nfsd: FSSTAT(3)   %s\n",
657 				SVCFH_fmt(&argp->fh));
658 
659 	resp->status = nfsd_statfs(rqstp, &argp->fh, &resp->stats, 0);
660 	fh_put(&argp->fh);
661 	return rpc_success;
662 }
663 
664 /*
665  * Get file system info
666  */
667 static __be32
nfsd3_proc_fsinfo(struct svc_rqst * rqstp)668 nfsd3_proc_fsinfo(struct svc_rqst *rqstp)
669 {
670 	struct nfsd_fhandle *argp = rqstp->rq_argp;
671 	struct nfsd3_fsinfores *resp = rqstp->rq_resp;
672 	u32	max_blocksize = svc_max_payload(rqstp);
673 
674 	dprintk("nfsd: FSINFO(3)   %s\n",
675 				SVCFH_fmt(&argp->fh));
676 
677 	resp->f_rtmax  = max_blocksize;
678 	resp->f_rtpref = max_blocksize;
679 	resp->f_rtmult = PAGE_SIZE;
680 	resp->f_wtmax  = max_blocksize;
681 	resp->f_wtpref = max_blocksize;
682 	resp->f_wtmult = PAGE_SIZE;
683 	resp->f_dtpref = max_blocksize;
684 	resp->f_maxfilesize = ~(u32) 0;
685 	resp->f_properties = NFS3_FSF_DEFAULT;
686 
687 	resp->status = fh_verify(rqstp, &argp->fh, 0,
688 				 NFSD_MAY_NOP | NFSD_MAY_BYPASS_GSS_ON_ROOT);
689 
690 	/* Check special features of the file system. May request
691 	 * different read/write sizes for file systems known to have
692 	 * problems with large blocks */
693 	if (resp->status == nfs_ok) {
694 		struct super_block *sb = argp->fh.fh_dentry->d_sb;
695 
696 		/* Note that we don't care for remote fs's here */
697 		if (sb->s_magic == MSDOS_SUPER_MAGIC) {
698 			resp->f_properties = NFS3_FSF_BILLYBOY;
699 		}
700 		resp->f_maxfilesize = sb->s_maxbytes;
701 	}
702 
703 	fh_put(&argp->fh);
704 	return rpc_success;
705 }
706 
707 /*
708  * Get pathconf info for the specified file
709  */
710 static __be32
nfsd3_proc_pathconf(struct svc_rqst * rqstp)711 nfsd3_proc_pathconf(struct svc_rqst *rqstp)
712 {
713 	struct nfsd_fhandle *argp = rqstp->rq_argp;
714 	struct nfsd3_pathconfres *resp = rqstp->rq_resp;
715 
716 	dprintk("nfsd: PATHCONF(3) %s\n",
717 				SVCFH_fmt(&argp->fh));
718 
719 	/* Set default pathconf */
720 	resp->p_link_max = 255;		/* at least */
721 	resp->p_name_max = 255;		/* at least */
722 	resp->p_no_trunc = 0;
723 	resp->p_chown_restricted = 1;
724 	resp->p_case_insensitive = 0;
725 	resp->p_case_preserving = 1;
726 
727 	resp->status = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
728 
729 	if (resp->status == nfs_ok) {
730 		struct super_block *sb = argp->fh.fh_dentry->d_sb;
731 
732 		/* Note that we don't care for remote fs's here */
733 		switch (sb->s_magic) {
734 		case EXT2_SUPER_MAGIC:
735 			resp->p_link_max = EXT2_LINK_MAX;
736 			resp->p_name_max = EXT2_NAME_LEN;
737 			break;
738 		case MSDOS_SUPER_MAGIC:
739 			resp->p_case_insensitive = 1;
740 			resp->p_case_preserving  = 0;
741 			break;
742 		}
743 	}
744 
745 	fh_put(&argp->fh);
746 	return rpc_success;
747 }
748 
749 /*
750  * Commit a file (range) to stable storage.
751  */
752 static __be32
nfsd3_proc_commit(struct svc_rqst * rqstp)753 nfsd3_proc_commit(struct svc_rqst *rqstp)
754 {
755 	struct nfsd3_commitargs *argp = rqstp->rq_argp;
756 	struct nfsd3_commitres *resp = rqstp->rq_resp;
757 	struct nfsd_file *nf;
758 
759 	dprintk("nfsd: COMMIT(3)   %s %u@%Lu\n",
760 				SVCFH_fmt(&argp->fh),
761 				argp->count,
762 				(unsigned long long) argp->offset);
763 
764 	fh_copy(&resp->fh, &argp->fh);
765 	resp->status = nfsd_file_acquire_gc(rqstp, &resp->fh, NFSD_MAY_WRITE |
766 					    NFSD_MAY_NOT_BREAK_LEASE, &nf);
767 	if (resp->status)
768 		goto out;
769 	resp->status = nfsd_commit(rqstp, &resp->fh, nf, argp->offset,
770 				   argp->count, resp->verf);
771 	nfsd_file_put(nf);
772 out:
773 	return rpc_success;
774 }
775 
776 
777 /*
778  * NFSv3 Server procedures.
779  * Only the results of non-idempotent operations are cached.
780  */
781 #define nfs3svc_encode_attrstatres	nfs3svc_encode_attrstat
782 #define nfs3svc_encode_wccstatres	nfs3svc_encode_wccstat
783 #define nfsd3_mkdirargs			nfsd3_createargs
784 #define nfsd3_readdirplusargs		nfsd3_readdirargs
785 #define nfsd3_fhandleargs		nfsd_fhandle
786 #define nfsd3_attrstatres		nfsd3_attrstat
787 #define nfsd3_wccstatres		nfsd3_attrstat
788 #define nfsd3_createres			nfsd3_diropres
789 
790 #define ST 1		/* status*/
791 #define FH 17		/* filehandle with length */
792 #define AT 21		/* attributes */
793 #define pAT (1+AT)	/* post attributes - conditional */
794 #define WC (7+pAT)	/* WCC attributes */
795 
796 static const struct svc_procedure nfsd_procedures3[22] = {
797 	[NFS3PROC_NULL] = {
798 		.pc_func = nfsd3_proc_null,
799 		.pc_decode = nfssvc_decode_voidarg,
800 		.pc_encode = nfssvc_encode_voidres,
801 		.pc_argsize = sizeof(struct nfsd_voidargs),
802 		.pc_argzero = sizeof(struct nfsd_voidargs),
803 		.pc_ressize = sizeof(struct nfsd_voidres),
804 		.pc_cachetype = RC_NOCACHE,
805 		.pc_xdrressize = ST,
806 		.pc_name = "NULL",
807 	},
808 	[NFS3PROC_GETATTR] = {
809 		.pc_func = nfsd3_proc_getattr,
810 		.pc_decode = nfs3svc_decode_fhandleargs,
811 		.pc_encode = nfs3svc_encode_getattrres,
812 		.pc_release = nfs3svc_release_fhandle,
813 		.pc_argsize = sizeof(struct nfsd_fhandle),
814 		.pc_argzero = sizeof(struct nfsd_fhandle),
815 		.pc_ressize = sizeof(struct nfsd3_attrstatres),
816 		.pc_cachetype = RC_NOCACHE,
817 		.pc_xdrressize = ST+AT,
818 		.pc_name = "GETATTR",
819 	},
820 	[NFS3PROC_SETATTR] = {
821 		.pc_func = nfsd3_proc_setattr,
822 		.pc_decode = nfs3svc_decode_sattrargs,
823 		.pc_encode = nfs3svc_encode_wccstatres,
824 		.pc_release = nfs3svc_release_fhandle,
825 		.pc_argsize = sizeof(struct nfsd3_sattrargs),
826 		.pc_argzero = sizeof(struct nfsd3_sattrargs),
827 		.pc_ressize = sizeof(struct nfsd3_wccstatres),
828 		.pc_cachetype = RC_REPLBUFF,
829 		.pc_xdrressize = ST+WC,
830 		.pc_name = "SETATTR",
831 	},
832 	[NFS3PROC_LOOKUP] = {
833 		.pc_func = nfsd3_proc_lookup,
834 		.pc_decode = nfs3svc_decode_diropargs,
835 		.pc_encode = nfs3svc_encode_lookupres,
836 		.pc_release = nfs3svc_release_fhandle2,
837 		.pc_argsize = sizeof(struct nfsd3_diropargs),
838 		.pc_argzero = sizeof(struct nfsd3_diropargs),
839 		.pc_ressize = sizeof(struct nfsd3_diropres),
840 		.pc_cachetype = RC_NOCACHE,
841 		.pc_xdrressize = ST+FH+pAT+pAT,
842 		.pc_name = "LOOKUP",
843 	},
844 	[NFS3PROC_ACCESS] = {
845 		.pc_func = nfsd3_proc_access,
846 		.pc_decode = nfs3svc_decode_accessargs,
847 		.pc_encode = nfs3svc_encode_accessres,
848 		.pc_release = nfs3svc_release_fhandle,
849 		.pc_argsize = sizeof(struct nfsd3_accessargs),
850 		.pc_argzero = sizeof(struct nfsd3_accessargs),
851 		.pc_ressize = sizeof(struct nfsd3_accessres),
852 		.pc_cachetype = RC_NOCACHE,
853 		.pc_xdrressize = ST+pAT+1,
854 		.pc_name = "ACCESS",
855 	},
856 	[NFS3PROC_READLINK] = {
857 		.pc_func = nfsd3_proc_readlink,
858 		.pc_decode = nfs3svc_decode_fhandleargs,
859 		.pc_encode = nfs3svc_encode_readlinkres,
860 		.pc_release = nfs3svc_release_fhandle,
861 		.pc_argsize = sizeof(struct nfsd_fhandle),
862 		.pc_argzero = sizeof(struct nfsd_fhandle),
863 		.pc_ressize = sizeof(struct nfsd3_readlinkres),
864 		.pc_cachetype = RC_NOCACHE,
865 		.pc_xdrressize = ST+pAT+1+NFS3_MAXPATHLEN/4,
866 		.pc_name = "READLINK",
867 	},
868 	[NFS3PROC_READ] = {
869 		.pc_func = nfsd3_proc_read,
870 		.pc_decode = nfs3svc_decode_readargs,
871 		.pc_encode = nfs3svc_encode_readres,
872 		.pc_release = nfs3svc_release_fhandle,
873 		.pc_argsize = sizeof(struct nfsd3_readargs),
874 		.pc_argzero = sizeof(struct nfsd3_readargs),
875 		.pc_ressize = sizeof(struct nfsd3_readres),
876 		.pc_cachetype = RC_NOCACHE,
877 		.pc_xdrressize = ST+pAT+4+NFSSVC_MAXBLKSIZE/4,
878 		.pc_name = "READ",
879 	},
880 	[NFS3PROC_WRITE] = {
881 		.pc_func = nfsd3_proc_write,
882 		.pc_decode = nfs3svc_decode_writeargs,
883 		.pc_encode = nfs3svc_encode_writeres,
884 		.pc_release = nfs3svc_release_fhandle,
885 		.pc_argsize = sizeof(struct nfsd3_writeargs),
886 		.pc_argzero = sizeof(struct nfsd3_writeargs),
887 		.pc_ressize = sizeof(struct nfsd3_writeres),
888 		.pc_cachetype = RC_REPLBUFF,
889 		.pc_xdrressize = ST+WC+4,
890 		.pc_name = "WRITE",
891 	},
892 	[NFS3PROC_CREATE] = {
893 		.pc_func = nfsd3_proc_create,
894 		.pc_decode = nfs3svc_decode_createargs,
895 		.pc_encode = nfs3svc_encode_createres,
896 		.pc_release = nfs3svc_release_fhandle2,
897 		.pc_argsize = sizeof(struct nfsd3_createargs),
898 		.pc_argzero = sizeof(struct nfsd3_createargs),
899 		.pc_ressize = sizeof(struct nfsd3_createres),
900 		.pc_cachetype = RC_REPLBUFF,
901 		.pc_xdrressize = ST+(1+FH+pAT)+WC,
902 		.pc_name = "CREATE",
903 	},
904 	[NFS3PROC_MKDIR] = {
905 		.pc_func = nfsd3_proc_mkdir,
906 		.pc_decode = nfs3svc_decode_mkdirargs,
907 		.pc_encode = nfs3svc_encode_createres,
908 		.pc_release = nfs3svc_release_fhandle2,
909 		.pc_argsize = sizeof(struct nfsd3_mkdirargs),
910 		.pc_argzero = sizeof(struct nfsd3_mkdirargs),
911 		.pc_ressize = sizeof(struct nfsd3_createres),
912 		.pc_cachetype = RC_REPLBUFF,
913 		.pc_xdrressize = ST+(1+FH+pAT)+WC,
914 		.pc_name = "MKDIR",
915 	},
916 	[NFS3PROC_SYMLINK] = {
917 		.pc_func = nfsd3_proc_symlink,
918 		.pc_decode = nfs3svc_decode_symlinkargs,
919 		.pc_encode = nfs3svc_encode_createres,
920 		.pc_release = nfs3svc_release_fhandle2,
921 		.pc_argsize = sizeof(struct nfsd3_symlinkargs),
922 		.pc_argzero = sizeof(struct nfsd3_symlinkargs),
923 		.pc_ressize = sizeof(struct nfsd3_createres),
924 		.pc_cachetype = RC_REPLBUFF,
925 		.pc_xdrressize = ST+(1+FH+pAT)+WC,
926 		.pc_name = "SYMLINK",
927 	},
928 	[NFS3PROC_MKNOD] = {
929 		.pc_func = nfsd3_proc_mknod,
930 		.pc_decode = nfs3svc_decode_mknodargs,
931 		.pc_encode = nfs3svc_encode_createres,
932 		.pc_release = nfs3svc_release_fhandle2,
933 		.pc_argsize = sizeof(struct nfsd3_mknodargs),
934 		.pc_argzero = sizeof(struct nfsd3_mknodargs),
935 		.pc_ressize = sizeof(struct nfsd3_createres),
936 		.pc_cachetype = RC_REPLBUFF,
937 		.pc_xdrressize = ST+(1+FH+pAT)+WC,
938 		.pc_name = "MKNOD",
939 	},
940 	[NFS3PROC_REMOVE] = {
941 		.pc_func = nfsd3_proc_remove,
942 		.pc_decode = nfs3svc_decode_diropargs,
943 		.pc_encode = nfs3svc_encode_wccstatres,
944 		.pc_release = nfs3svc_release_fhandle,
945 		.pc_argsize = sizeof(struct nfsd3_diropargs),
946 		.pc_argzero = sizeof(struct nfsd3_diropargs),
947 		.pc_ressize = sizeof(struct nfsd3_wccstatres),
948 		.pc_cachetype = RC_REPLBUFF,
949 		.pc_xdrressize = ST+WC,
950 		.pc_name = "REMOVE",
951 	},
952 	[NFS3PROC_RMDIR] = {
953 		.pc_func = nfsd3_proc_rmdir,
954 		.pc_decode = nfs3svc_decode_diropargs,
955 		.pc_encode = nfs3svc_encode_wccstatres,
956 		.pc_release = nfs3svc_release_fhandle,
957 		.pc_argsize = sizeof(struct nfsd3_diropargs),
958 		.pc_argzero = sizeof(struct nfsd3_diropargs),
959 		.pc_ressize = sizeof(struct nfsd3_wccstatres),
960 		.pc_cachetype = RC_REPLBUFF,
961 		.pc_xdrressize = ST+WC,
962 		.pc_name = "RMDIR",
963 	},
964 	[NFS3PROC_RENAME] = {
965 		.pc_func = nfsd3_proc_rename,
966 		.pc_decode = nfs3svc_decode_renameargs,
967 		.pc_encode = nfs3svc_encode_renameres,
968 		.pc_release = nfs3svc_release_fhandle2,
969 		.pc_argsize = sizeof(struct nfsd3_renameargs),
970 		.pc_argzero = sizeof(struct nfsd3_renameargs),
971 		.pc_ressize = sizeof(struct nfsd3_renameres),
972 		.pc_cachetype = RC_REPLBUFF,
973 		.pc_xdrressize = ST+WC+WC,
974 		.pc_name = "RENAME",
975 	},
976 	[NFS3PROC_LINK] = {
977 		.pc_func = nfsd3_proc_link,
978 		.pc_decode = nfs3svc_decode_linkargs,
979 		.pc_encode = nfs3svc_encode_linkres,
980 		.pc_release = nfs3svc_release_fhandle2,
981 		.pc_argsize = sizeof(struct nfsd3_linkargs),
982 		.pc_argzero = sizeof(struct nfsd3_linkargs),
983 		.pc_ressize = sizeof(struct nfsd3_linkres),
984 		.pc_cachetype = RC_REPLBUFF,
985 		.pc_xdrressize = ST+pAT+WC,
986 		.pc_name = "LINK",
987 	},
988 	[NFS3PROC_READDIR] = {
989 		.pc_func = nfsd3_proc_readdir,
990 		.pc_decode = nfs3svc_decode_readdirargs,
991 		.pc_encode = nfs3svc_encode_readdirres,
992 		.pc_release = nfs3svc_release_fhandle,
993 		.pc_argsize = sizeof(struct nfsd3_readdirargs),
994 		.pc_argzero = sizeof(struct nfsd3_readdirargs),
995 		.pc_ressize = sizeof(struct nfsd3_readdirres),
996 		.pc_cachetype = RC_NOCACHE,
997 		.pc_name = "READDIR",
998 	},
999 	[NFS3PROC_READDIRPLUS] = {
1000 		.pc_func = nfsd3_proc_readdirplus,
1001 		.pc_decode = nfs3svc_decode_readdirplusargs,
1002 		.pc_encode = nfs3svc_encode_readdirres,
1003 		.pc_release = nfs3svc_release_fhandle,
1004 		.pc_argsize = sizeof(struct nfsd3_readdirplusargs),
1005 		.pc_argzero = sizeof(struct nfsd3_readdirplusargs),
1006 		.pc_ressize = sizeof(struct nfsd3_readdirres),
1007 		.pc_cachetype = RC_NOCACHE,
1008 		.pc_name = "READDIRPLUS",
1009 	},
1010 	[NFS3PROC_FSSTAT] = {
1011 		.pc_func = nfsd3_proc_fsstat,
1012 		.pc_decode = nfs3svc_decode_fhandleargs,
1013 		.pc_encode = nfs3svc_encode_fsstatres,
1014 		.pc_argsize = sizeof(struct nfsd3_fhandleargs),
1015 		.pc_argzero = sizeof(struct nfsd3_fhandleargs),
1016 		.pc_ressize = sizeof(struct nfsd3_fsstatres),
1017 		.pc_cachetype = RC_NOCACHE,
1018 		.pc_xdrressize = ST+pAT+2*6+1,
1019 		.pc_name = "FSSTAT",
1020 	},
1021 	[NFS3PROC_FSINFO] = {
1022 		.pc_func = nfsd3_proc_fsinfo,
1023 		.pc_decode = nfs3svc_decode_fhandleargs,
1024 		.pc_encode = nfs3svc_encode_fsinfores,
1025 		.pc_argsize = sizeof(struct nfsd3_fhandleargs),
1026 		.pc_argzero = sizeof(struct nfsd3_fhandleargs),
1027 		.pc_ressize = sizeof(struct nfsd3_fsinfores),
1028 		.pc_cachetype = RC_NOCACHE,
1029 		.pc_xdrressize = ST+pAT+12,
1030 		.pc_name = "FSINFO",
1031 	},
1032 	[NFS3PROC_PATHCONF] = {
1033 		.pc_func = nfsd3_proc_pathconf,
1034 		.pc_decode = nfs3svc_decode_fhandleargs,
1035 		.pc_encode = nfs3svc_encode_pathconfres,
1036 		.pc_argsize = sizeof(struct nfsd3_fhandleargs),
1037 		.pc_argzero = sizeof(struct nfsd3_fhandleargs),
1038 		.pc_ressize = sizeof(struct nfsd3_pathconfres),
1039 		.pc_cachetype = RC_NOCACHE,
1040 		.pc_xdrressize = ST+pAT+6,
1041 		.pc_name = "PATHCONF",
1042 	},
1043 	[NFS3PROC_COMMIT] = {
1044 		.pc_func = nfsd3_proc_commit,
1045 		.pc_decode = nfs3svc_decode_commitargs,
1046 		.pc_encode = nfs3svc_encode_commitres,
1047 		.pc_release = nfs3svc_release_fhandle,
1048 		.pc_argsize = sizeof(struct nfsd3_commitargs),
1049 		.pc_argzero = sizeof(struct nfsd3_commitargs),
1050 		.pc_ressize = sizeof(struct nfsd3_commitres),
1051 		.pc_cachetype = RC_NOCACHE,
1052 		.pc_xdrressize = ST+WC+2,
1053 		.pc_name = "COMMIT",
1054 	},
1055 };
1056 
1057 static DEFINE_PER_CPU_ALIGNED(unsigned long,
1058 			      nfsd_count3[ARRAY_SIZE(nfsd_procedures3)]);
1059 const struct svc_version nfsd_version3 = {
1060 	.vs_vers	= 3,
1061 	.vs_nproc	= ARRAY_SIZE(nfsd_procedures3),
1062 	.vs_proc	= nfsd_procedures3,
1063 	.vs_dispatch	= nfsd_dispatch,
1064 	.vs_count	= nfsd_count3,
1065 	.vs_xdrsize	= NFS3_SVC_XDRSIZE,
1066 };
1067