xref: /freebsd/stand/libsa/nfs.c (revision 2f513db7) 
1 /*	$NetBSD: nfs.c,v 1.2 1998/01/24 12:43:09 drochner Exp $	*/
2 
3 /*-
4  *  Copyright (c) 1993 John Brezak
5  *  All rights reserved.
6  *
7  *  Redistribution and use in source and binary forms, with or without
8  *  modification, are permitted provided that the following conditions
9  *  are met:
10  *  1. Redistributions of source code must retain the above copyright
11  *     notice, this list of conditions and the following disclaimer.
12  *  2. Redistributions in binary form must reproduce the above copyright
13  *     notice, this list of conditions and the following disclaimer in the
14  *     documentation and/or other materials provided with the distribution.
15  *  3. The name of the author may not be used to endorse or promote products
16  *     derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
27  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28  * POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33 
34 #include <sys/param.h>
35 #include <sys/time.h>
36 #include <sys/socket.h>
37 #include <sys/stat.h>
38 #include <string.h>
39 #include <stddef.h>
40 
41 #include <netinet/in.h>
42 #include <netinet/in_systm.h>
43 
44 #include "rpcv2.h"
45 #include "nfsv2.h"
46 
47 #include "stand.h"
48 #include "net.h"
49 #include "netif.h"
50 #include "rpc.h"
51 
52 #define NFS_DEBUGxx
53 
54 #define NFSREAD_MIN_SIZE 1024
55 #define NFSREAD_MAX_SIZE 16384
56 
57 /* NFSv3 definitions */
58 #define	NFS_V3MAXFHSIZE		64
59 #define	NFS_VER3		3
60 #define	RPCMNT_VER3		3
61 #define	NFSPROCV3_LOOKUP	3
62 #define	NFSPROCV3_READLINK	5
63 #define	NFSPROCV3_READ		6
64 #define	NFSPROCV3_READDIR	16
65 
66 typedef struct {
67 	uint32_t val[2];
68 } n_quad;
69 
70 struct nfsv3_time {
71 	uint32_t nfs_sec;
72 	uint32_t nfs_nsec;
73 };
74 
75 struct nfsv3_fattrs {
76 	uint32_t fa_type;
77 	uint32_t fa_mode;
78 	uint32_t fa_nlink;
79 	uint32_t fa_uid;
80 	uint32_t fa_gid;
81 	n_quad fa_size;
82 	n_quad fa_used;
83 	n_quad fa_rdev;
84 	n_quad fa_fsid;
85 	n_quad fa_fileid;
86 	struct nfsv3_time fa_atime;
87 	struct nfsv3_time fa_mtime;
88 	struct nfsv3_time fa_ctime;
89 };
90 
91 /*
92  * For NFSv3, the file handle is variable in size, so most fixed sized
93  * structures for arguments won't work. For most cases, a structure
94  * that starts with any fixed size section is followed by an array
95  * that covers the maximum size required.
96  */
97 struct nfsv3_readdir_repl {
98 	uint32_t errno;
99 	uint32_t ok;
100 	struct nfsv3_fattrs fa;
101 	uint32_t cookiev0;
102 	uint32_t cookiev1;
103 };
104 
105 struct nfsv3_readdir_entry {
106 	uint32_t follows;
107 	uint32_t fid0;
108 	uint32_t fid1;
109 	uint32_t len;
110 	uint32_t nameplus[0];
111 };
112 
113 struct nfs_iodesc {
114 	struct iodesc *iodesc;
115 	off_t off;
116 	uint32_t fhsize;
117 	u_char fh[NFS_V3MAXFHSIZE];
118 	struct nfsv3_fattrs fa;	/* all in network order */
119 	uint64_t cookie;
120 };
121 
122 /*
123  * XXX interactions with tftp? See nfswrapper.c for a confusing
124  *     issue.
125  */
126 int		nfs_open(const char *path, struct open_file *f);
127 static int	nfs_close(struct open_file *f);
128 static int	nfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
129 static off_t	nfs_seek(struct open_file *f, off_t offset, int where);
130 static int	nfs_stat(struct open_file *f, struct stat *sb);
131 static int	nfs_readdir(struct open_file *f, struct dirent *d);
132 
133 struct	nfs_iodesc nfs_root_node;
134 
135 struct fs_ops nfs_fsops = {
136 	"nfs",
137 	nfs_open,
138 	nfs_close,
139 	nfs_read,
140 	null_write,
141 	nfs_seek,
142 	nfs_stat,
143 	nfs_readdir
144 };
145 
146 static int nfs_read_size = NFSREAD_MIN_SIZE;
147 
148 /*
149  * Improve boot performance over NFS
150  */
151 static void
152 set_nfs_read_size(void)
153 {
154 	char *env, *end;
155 	char buf[10];
156 
157 	if ((env = getenv("nfs.read_size")) != NULL) {
158 		errno = 0;
159 		nfs_read_size = (int)strtol(env, &end, 0);
160 		if (errno != 0 || *env == '\0' || *end != '\0') {
161 			printf("%s: bad value: \"%s\", defaulting to %d\n",
162 			    "nfs.read_size", env, NFSREAD_MIN_SIZE);
163 			nfs_read_size = NFSREAD_MIN_SIZE;
164 		}
165 	}
166 	if (nfs_read_size < NFSREAD_MIN_SIZE) {
167 		printf("%s: bad value: \"%d\", defaulting to %d\n",
168 		    "nfs.read_size", nfs_read_size, NFSREAD_MIN_SIZE);
169 		nfs_read_size = NFSREAD_MIN_SIZE;
170 	}
171 	if (nfs_read_size > NFSREAD_MAX_SIZE) {
172 		printf("%s: bad value: \"%d\", defaulting to %d\n",
173 		    "nfs.read_size", nfs_read_size, NFSREAD_MIN_SIZE);
174 		nfs_read_size = NFSREAD_MAX_SIZE;
175 	}
176 	snprintf(buf, sizeof (buf), "%d", nfs_read_size);
177 	setenv("nfs.read_size", buf, 1);
178 }
179 
180 /*
181  * Fetch the root file handle (call mount daemon)
182  * Return zero or error number.
183  */
184 int
185 nfs_getrootfh(struct iodesc *d, char *path, uint32_t *fhlenp, u_char *fhp)
186 {
187 	void *pkt = NULL;
188 	int len;
189 	struct args {
190 		uint32_t len;
191 		char path[FNAME_SIZE];
192 	} *args;
193 	struct repl {
194 		uint32_t errno;
195 		uint32_t fhsize;
196 		u_char fh[NFS_V3MAXFHSIZE];
197 		uint32_t authcnt;
198 		uint32_t auth[7];
199 	} *repl;
200 	struct {
201 		uint32_t h[RPC_HEADER_WORDS];
202 		struct args d;
203 	} sdata;
204 	size_t cc;
205 
206 #ifdef NFS_DEBUG
207 	if (debug)
208 		printf("nfs_getrootfh: %s\n", path);
209 #endif
210 
211 	args = &sdata.d;
212 
213 	bzero(args, sizeof(*args));
214 	len = strlen(path);
215 	if (len > sizeof(args->path))
216 		len = sizeof(args->path);
217 	args->len = htonl(len);
218 	bcopy(path, args->path, len);
219 	len = sizeof(uint32_t) + roundup(len, sizeof(uint32_t));
220 
221 	cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER3, RPCMNT_MOUNT,
222 	    args, len, (void **)&repl, &pkt);
223 	if (cc == -1) {
224 		free(pkt);
225 		/* errno was set by rpc_call */
226 		return (errno);
227 	}
228 	if (cc < 2 * sizeof (uint32_t)) {
229 		free(pkt);
230 		return (EBADRPC);
231 	}
232 	if (repl->errno != 0) {
233 		free(pkt);
234 		return (ntohl(repl->errno));
235 	}
236 	*fhlenp = ntohl(repl->fhsize);
237 	bcopy(repl->fh, fhp, *fhlenp);
238 
239 	set_nfs_read_size();
240 	free(pkt);
241 	return (0);
242 }
243 
244 /*
245  * Lookup a file.  Store handle and attributes.
246  * Return zero or error number.
247  */
248 int
249 nfs_lookupfh(struct nfs_iodesc *d, const char *name, struct nfs_iodesc *newfd)
250 {
251 	void *pkt = NULL;
252 	int len, pos;
253 	struct args {
254 		uint32_t fhsize;
255 		uint32_t fhplusname[1 +
256 		    (NFS_V3MAXFHSIZE + FNAME_SIZE) / sizeof(uint32_t)];
257 	} *args;
258 	struct repl {
259 		uint32_t errno;
260 		uint32_t fhsize;
261 		uint32_t fhplusattr[(NFS_V3MAXFHSIZE +
262 		    2 * (sizeof(uint32_t) +
263 		    sizeof(struct nfsv3_fattrs))) / sizeof(uint32_t)];
264 	} *repl;
265 	struct {
266 		uint32_t h[RPC_HEADER_WORDS];
267 		struct args d;
268 	} sdata;
269 	ssize_t cc;
270 
271 #ifdef NFS_DEBUG
272 	if (debug)
273 		printf("lookupfh: called\n");
274 #endif
275 
276 	args = &sdata.d;
277 
278 	bzero(args, sizeof(*args));
279 	args->fhsize = htonl(d->fhsize);
280 	bcopy(d->fh, args->fhplusname, d->fhsize);
281 	len = strlen(name);
282 	if (len > FNAME_SIZE)
283 		len = FNAME_SIZE;
284 	pos = roundup(d->fhsize, sizeof(uint32_t)) / sizeof(uint32_t);
285 	args->fhplusname[pos++] = htonl(len);
286 	bcopy(name, &args->fhplusname[pos], len);
287 	len = sizeof(uint32_t) + pos * sizeof(uint32_t) +
288 	    roundup(len, sizeof(uint32_t));
289 
290 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER3, NFSPROCV3_LOOKUP,
291 	    args, len, (void **)&repl, &pkt);
292 	if (cc == -1) {
293 		free(pkt);
294 		return (errno);		/* XXX - from rpc_call */
295 	}
296 	if (cc < 2 * sizeof(uint32_t)) {
297 		free(pkt);
298 		return (EIO);
299 	}
300 	if (repl->errno != 0) {
301 		free(pkt);
302 		/* saerrno.h now matches NFS error numbers. */
303 		return (ntohl(repl->errno));
304 	}
305 	newfd->fhsize = ntohl(repl->fhsize);
306 	bcopy(repl->fhplusattr, &newfd->fh, newfd->fhsize);
307 	pos = roundup(newfd->fhsize, sizeof(uint32_t)) / sizeof(uint32_t);
308 	if (repl->fhplusattr[pos++] == 0) {
309 		free(pkt);
310 		return (EIO);
311 	}
312 	bcopy(&repl->fhplusattr[pos], &newfd->fa, sizeof(newfd->fa));
313 	free(pkt);
314 	return (0);
315 }
316 
317 #ifndef NFS_NOSYMLINK
318 /*
319  * Get the destination of a symbolic link.
320  */
321 int
322 nfs_readlink(struct nfs_iodesc *d, char *buf)
323 {
324 	void *pkt = NULL;
325 	struct args {
326 		uint32_t fhsize;
327 		u_char fh[NFS_V3MAXFHSIZE];
328 	} *args;
329 	struct repl {
330 		uint32_t errno;
331 		uint32_t ok;
332 		struct nfsv3_fattrs fa;
333 		uint32_t len;
334 		u_char path[NFS_MAXPATHLEN];
335 	} *repl;
336 	struct {
337 		uint32_t h[RPC_HEADER_WORDS];
338 		struct args d;
339 	} sdata;
340 	ssize_t cc;
341 	int rc = 0;
342 
343 #ifdef NFS_DEBUG
344 	if (debug)
345 		printf("readlink: called\n");
346 #endif
347 
348 	args = &sdata.d;
349 
350 	bzero(args, sizeof(*args));
351 	args->fhsize = htonl(d->fhsize);
352 	bcopy(d->fh, args->fh, d->fhsize);
353 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER3, NFSPROCV3_READLINK,
354 	    args, sizeof(uint32_t) + roundup(d->fhsize, sizeof(uint32_t)),
355 	    (void **)&repl, &pkt);
356 	if (cc == -1)
357 		return (errno);
358 
359 	if (cc < 2 * sizeof(uint32_t)) {
360 		rc = EIO;
361 		goto done;
362 	}
363 
364 	if (repl->errno != 0) {
365 		rc = ntohl(repl->errno);
366 		goto done;
367 	}
368 
369 	if (repl->ok == 0) {
370 		rc = EIO;
371 		goto done;
372 	}
373 
374 	repl->len = ntohl(repl->len);
375 	if (repl->len > NFS_MAXPATHLEN) {
376 		rc = ENAMETOOLONG;
377 		goto done;
378 	}
379 
380 	bcopy(repl->path, buf, repl->len);
381 	buf[repl->len] = 0;
382 done:
383 	free(pkt);
384 	return (rc);
385 }
386 #endif
387 
388 /*
389  * Read data from a file.
390  * Return transfer count or -1 (and set errno)
391  */
392 ssize_t
393 nfs_readdata(struct nfs_iodesc *d, off_t off, void *addr, size_t len)
394 {
395 	void *pkt = NULL;
396 	struct args {
397 		uint32_t fhsize;
398 		uint32_t fhoffcnt[NFS_V3MAXFHSIZE / sizeof(uint32_t) + 3];
399 	} *args;
400 	struct repl {
401 		uint32_t errno;
402 		uint32_t ok;
403 		struct nfsv3_fattrs fa;
404 		uint32_t count;
405 		uint32_t eof;
406 		uint32_t len;
407 		u_char data[NFSREAD_MAX_SIZE];
408 	} *repl;
409 	struct {
410 		uint32_t h[RPC_HEADER_WORDS];
411 		struct args d;
412 	} sdata;
413 	size_t cc;
414 	long x;
415 	int hlen, rlen, pos;
416 
417 	args = &sdata.d;
418 
419 	bzero(args, sizeof(*args));
420 	args->fhsize = htonl(d->fhsize);
421 	bcopy(d->fh, args->fhoffcnt, d->fhsize);
422 	pos = roundup(d->fhsize, sizeof(uint32_t)) / sizeof(uint32_t);
423 	args->fhoffcnt[pos++] = 0;
424 	args->fhoffcnt[pos++] = htonl((uint32_t)off);
425 	if (len > nfs_read_size)
426 		len = nfs_read_size;
427 	args->fhoffcnt[pos] = htonl((uint32_t)len);
428 	hlen = offsetof(struct repl, data[0]);
429 
430 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER3, NFSPROCV3_READ,
431 	    args, 4 * sizeof(uint32_t) + roundup(d->fhsize, sizeof(uint32_t)),
432 	    (void **)&repl, &pkt);
433 	if (cc == -1) {
434 		/* errno was already set by rpc_call */
435 		return (-1);
436 	}
437 	if (cc < hlen) {
438 		errno = EBADRPC;
439 		free(pkt);
440 		return (-1);
441 	}
442 	if (repl->errno != 0) {
443 		errno = ntohl(repl->errno);
444 		free(pkt);
445 		return (-1);
446 	}
447 	rlen = cc - hlen;
448 	x = ntohl(repl->count);
449 	if (rlen < x) {
450 		printf("nfsread: short packet, %d < %ld\n", rlen, x);
451 		errno = EBADRPC;
452 		free(pkt);
453 		return (-1);
454 	}
455 	bcopy(repl->data, addr, x);
456 	free(pkt);
457 	return (x);
458 }
459 
460 /*
461  * Open a file.
462  * return zero or error number
463  */
464 int
465 nfs_open(const char *upath, struct open_file *f)
466 {
467 	struct iodesc *desc;
468 	struct nfs_iodesc *currfd = NULL;
469 	char buf[2 * NFS_V3MAXFHSIZE + 3];
470 	u_char *fh;
471 	char *cp;
472 	int i;
473 #ifndef NFS_NOSYMLINK
474 	struct nfs_iodesc *newfd = NULL;
475 	char *ncp;
476 	int c;
477 	char namebuf[NFS_MAXPATHLEN + 1];
478 	char linkbuf[NFS_MAXPATHLEN + 1];
479 	int nlinks = 0;
480 #endif
481 	int error;
482 	char *path = NULL;
483 
484 	if (netproto != NET_NFS)
485 		return (EINVAL);
486 
487 #ifdef NFS_DEBUG
488  	if (debug)
489 		printf("nfs_open: %s (rootip=%s rootpath=%s)\n", upath,
490 		    inet_ntoa(rootip), rootpath);
491 #endif
492 	if (!rootpath[0]) {
493 		printf("no rootpath, no nfs\n");
494 		return (ENXIO);
495 	}
496 
497 	if (f->f_dev->dv_type != DEVT_NET)
498 		return (EINVAL);
499 
500 	if (!(desc = socktodesc(*(int *)(f->f_devdata))))
501 		return (EINVAL);
502 
503 	/* Bind to a reserved port. */
504 	desc->myport = htons(--rpc_port);
505 	desc->destip = rootip;
506 	if ((error = nfs_getrootfh(desc, rootpath, &nfs_root_node.fhsize,
507 	    nfs_root_node.fh)))
508 		return (error);
509 	nfs_root_node.fa.fa_type  = htonl(NFDIR);
510 	nfs_root_node.fa.fa_mode  = htonl(0755);
511 	nfs_root_node.fa.fa_nlink = htonl(2);
512 	nfs_root_node.iodesc = desc;
513 
514 	fh = &nfs_root_node.fh[0];
515 	buf[0] = 'X';
516 	cp = &buf[1];
517 	for (i = 0; i < nfs_root_node.fhsize; i++, cp += 2)
518 		sprintf(cp, "%02x", fh[i]);
519 	sprintf(cp, "X");
520 	setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
521 	setenv("boot.nfsroot.path", rootpath, 1);
522 	setenv("boot.nfsroot.nfshandle", buf, 1);
523 	sprintf(buf, "%d", nfs_root_node.fhsize);
524 	setenv("boot.nfsroot.nfshandlelen", buf, 1);
525 
526 	/* Allocate file system specific data structure */
527 	currfd = malloc(sizeof(*newfd));
528 	if (currfd == NULL) {
529 		error = ENOMEM;
530 		goto out;
531 	}
532 #ifndef NFS_NOSYMLINK
533 	bcopy(&nfs_root_node, currfd, sizeof(*currfd));
534 	newfd = NULL;
535 
536 	cp = path = strdup(upath);
537 	if (path == NULL) {
538 		error = ENOMEM;
539 		goto out;
540 	}
541 	while (*cp) {
542 		/*
543 		 * Remove extra separators
544 		 */
545 		while (*cp == '/')
546 			cp++;
547 
548 		if (*cp == '\0')
549 			break;
550 		/*
551 		 * Check that current node is a directory.
552 		 */
553 		if (currfd->fa.fa_type != htonl(NFDIR)) {
554 			error = ENOTDIR;
555 			goto out;
556 		}
557 
558 		/* allocate file system specific data structure */
559 		newfd = malloc(sizeof(*newfd));
560 		if (newfd == NULL) {
561 			error = ENOMEM;
562 			goto out;
563 		}
564 		newfd->iodesc = currfd->iodesc;
565 
566 		/*
567 		 * Get next component of path name.
568 		 */
569 		{
570 			int len = 0;
571 
572 			ncp = cp;
573 			while ((c = *cp) != '\0' && c != '/') {
574 				if (++len > NFS_MAXNAMLEN) {
575 					error = ENOENT;
576 					goto out;
577 				}
578 				cp++;
579 			}
580 			*cp = '\0';
581 		}
582 
583 		/* lookup a file handle */
584 		error = nfs_lookupfh(currfd, ncp, newfd);
585 		*cp = c;
586 		if (error)
587 			goto out;
588 
589 		/*
590 		 * Check for symbolic link
591 		 */
592 		if (newfd->fa.fa_type == htonl(NFLNK)) {
593 			int link_len, len;
594 
595 			error = nfs_readlink(newfd, linkbuf);
596 			if (error)
597 				goto out;
598 
599 			link_len = strlen(linkbuf);
600 			len = strlen(cp);
601 
602 			if (link_len + len > MAXPATHLEN
603 			    || ++nlinks > MAXSYMLINKS) {
604 				error = ENOENT;
605 				goto out;
606 			}
607 
608 			bcopy(cp, &namebuf[link_len], len + 1);
609 			bcopy(linkbuf, namebuf, link_len);
610 
611 			/*
612 			 * If absolute pathname, restart at root.
613 			 * If relative pathname, restart at parent directory.
614 			 */
615 			cp = namebuf;
616 			if (*cp == '/')
617 				bcopy(&nfs_root_node, currfd, sizeof(*currfd));
618 
619 			free(newfd);
620 			newfd = NULL;
621 
622 			continue;
623 		}
624 
625 		free(currfd);
626 		currfd = newfd;
627 		newfd = NULL;
628 	}
629 
630 	error = 0;
631 
632 out:
633 	free(newfd);
634 	free(path);
635 #else
636 	currfd->iodesc = desc;
637 
638 	error = nfs_lookupfh(&nfs_root_node, upath, currfd);
639 #endif
640 	if (!error) {
641 		currfd->off = 0;
642 		currfd->cookie = 0;
643 		f->f_fsdata = (void *)currfd;
644 		return (0);
645 	}
646 
647 #ifdef NFS_DEBUG
648 	if (debug)
649 		printf("nfs_open: %s lookupfh failed: %s\n",
650 		    path, strerror(error));
651 #endif
652 	free(currfd);
653 
654 	return (error);
655 }
656 
657 int
658 nfs_close(struct open_file *f)
659 {
660 	struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
661 
662 #ifdef NFS_DEBUG
663 	if (debug)
664 		printf("nfs_close: fp=0x%lx\n", (u_long)fp);
665 #endif
666 
667 	free(fp);
668 	f->f_fsdata = NULL;
669 
670 	return (0);
671 }
672 
673 /*
674  * read a portion of a file
675  */
676 int
677 nfs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
678 {
679 	struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
680 	ssize_t cc;
681 	char *addr = buf;
682 
683 #ifdef NFS_DEBUG
684 	if (debug)
685 		printf("nfs_read: size=%lu off=%d\n", (u_long)size,
686 		       (int)fp->off);
687 #endif
688 	while ((int)size > 0) {
689 		twiddle(16);
690 		cc = nfs_readdata(fp, fp->off, (void *)addr, size);
691 		/* XXX maybe should retry on certain errors */
692 		if (cc == -1) {
693 #ifdef NFS_DEBUG
694 			if (debug)
695 				printf("nfs_read: read: %s\n", strerror(errno));
696 #endif
697 			return (errno);	/* XXX - from nfs_readdata */
698 		}
699 		if (cc == 0) {
700 #ifdef NFS_DEBUG
701 			if (debug)
702 				printf("nfs_read: hit EOF unexpectedly\n");
703 #endif
704 			goto ret;
705 		}
706 		fp->off += cc;
707 		addr += cc;
708 		size -= cc;
709 	}
710 ret:
711 	if (resid)
712 		*resid = size;
713 
714 	return (0);
715 }
716 
717 off_t
718 nfs_seek(struct open_file *f, off_t offset, int where)
719 {
720 	struct nfs_iodesc *d = (struct nfs_iodesc *)f->f_fsdata;
721 	uint32_t size = ntohl(d->fa.fa_size.val[1]);
722 
723 	switch (where) {
724 	case SEEK_SET:
725 		d->off = offset;
726 		break;
727 	case SEEK_CUR:
728 		d->off += offset;
729 		break;
730 	case SEEK_END:
731 		d->off = size - offset;
732 		break;
733 	default:
734 		errno = EINVAL;
735 		return (-1);
736 	}
737 
738 	return (d->off);
739 }
740 
741 /* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5, NFSOCK=6, NFFIFO=7 */
742 int nfs_stat_types[9] = {
743 	0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, S_IFSOCK, S_IFIFO, 0 };
744 
745 int
746 nfs_stat(struct open_file *f, struct stat *sb)
747 {
748 	struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
749 	uint32_t ftype, mode;
750 
751 	ftype = ntohl(fp->fa.fa_type);
752 	mode  = ntohl(fp->fa.fa_mode);
753 	mode |= nfs_stat_types[ftype & 7];
754 
755 	sb->st_mode  = mode;
756 	sb->st_nlink = ntohl(fp->fa.fa_nlink);
757 	sb->st_uid   = ntohl(fp->fa.fa_uid);
758 	sb->st_gid   = ntohl(fp->fa.fa_gid);
759 	sb->st_size  = ntohl(fp->fa.fa_size.val[1]);
760 
761 	return (0);
762 }
763 
764 static int
765 nfs_readdir(struct open_file *f, struct dirent *d)
766 {
767 	struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
768 	struct nfsv3_readdir_repl *repl;
769 	struct nfsv3_readdir_entry *rent;
770 	static void *pkt = NULL;
771 	static char *buf;
772 	static struct nfs_iodesc *pfp = NULL;
773 	static uint64_t cookie = 0;
774 	size_t cc;
775 	int pos, rc;
776 
777 	struct args {
778 		uint32_t fhsize;
779 		uint32_t fhpluscookie[5 + NFS_V3MAXFHSIZE];
780 	} *args;
781 	struct {
782 		uint32_t h[RPC_HEADER_WORDS];
783 		struct args d;
784 	} sdata;
785 
786 	if (fp != pfp || fp->off != cookie) {
787 		pfp = NULL;
788 	refill:
789 		free(pkt);
790 		pkt = NULL;
791 		args = &sdata.d;
792 		bzero(args, sizeof(*args));
793 
794 		args->fhsize = htonl(fp->fhsize);
795 		bcopy(fp->fh, args->fhpluscookie, fp->fhsize);
796 		pos = roundup(fp->fhsize, sizeof(uint32_t)) / sizeof(uint32_t);
797 		args->fhpluscookie[pos++] = htonl(fp->off >> 32);
798 		args->fhpluscookie[pos++] = htonl(fp->off);
799 		args->fhpluscookie[pos++] = htonl(fp->cookie >> 32);
800 		args->fhpluscookie[pos++] = htonl(fp->cookie);
801 		args->fhpluscookie[pos] = htonl(NFS_READDIRSIZE);
802 
803 		cc = rpc_call(fp->iodesc, NFS_PROG, NFS_VER3, NFSPROCV3_READDIR,
804 		    args, 6 * sizeof(uint32_t) +
805 		    roundup(fp->fhsize, sizeof(uint32_t)),
806 		    (void **)&buf, &pkt);
807 		if (cc == -1) {
808 			rc = errno;
809 			goto err;
810 		}
811 		repl = (struct nfsv3_readdir_repl *)buf;
812 		if (repl->errno != 0) {
813 			rc = ntohl(repl->errno);
814 			goto err;
815 		}
816 		pfp = fp;
817 		cookie = fp->off;
818 		fp->cookie = ((uint64_t)ntohl(repl->cookiev0) << 32) |
819 		    ntohl(repl->cookiev1);
820 		buf += sizeof (struct nfsv3_readdir_repl);
821 	}
822 	rent = (struct nfsv3_readdir_entry *)buf;
823 
824 	if (rent->follows == 0) {
825 		/* fid0 is actually eof */
826 		if (rent->fid0 != 0) {
827 			rc = ENOENT;
828 			goto err;
829 		}
830 		goto refill;
831 	}
832 
833 	d->d_namlen = ntohl(rent->len);
834 	bcopy(rent->nameplus, d->d_name, d->d_namlen);
835 	d->d_name[d->d_namlen] = '\0';
836 
837 	pos = roundup(d->d_namlen, sizeof(uint32_t)) / sizeof(uint32_t);
838 	fp->off = cookie = ((uint64_t)ntohl(rent->nameplus[pos]) << 32) |
839 	    ntohl(rent->nameplus[pos + 1]);
840 	pos += 2;
841 	buf = (char *)&rent->nameplus[pos];
842 	return (0);
843 
844 err:
845 	free(pkt);
846 	pkt = NULL;
847 	pfp = NULL;
848 	cookie = 0;
849 	return (rc);
850 }
851