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puffs_portal.c revision 1.4.2.2 
      1 /*	$NetBSD: puffs_portal.c,v 1.4.2.2 2013/01/16 05:32:34 yamt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2007  Antti Kantee.  All Rights Reserved.
      5  * Development was supported by the Finnish Cultural Foundation.
      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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     19  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 #ifndef lint
     31 __RCSID("$NetBSD: puffs_portal.c,v 1.4.2.2 2013/01/16 05:32:34 yamt Exp $");
     32 #endif /* !lint */
     33 
     34 #include <sys/types.h>
     35 #include <sys/wait.h>
     36 #include <sys/socket.h>
     37 
     38 #include <assert.h>
     39 #include <err.h>
     40 #include <errno.h>
     41 #include <mntopts.h>
     42 #include <paths.h>
     43 #include <poll.h>
     44 #include <puffs.h>
     45 #include <stdio.h>
     46 #include <stdlib.h>
     47 #include <string.h>
     48 #include <unistd.h>
     49 #include <util.h>
     50 
     51 #include "portald.h"
     52 
     53 struct portal_node {
     54 	char *path;
     55 	int fd;
     56 };
     57 
     58 __dead static void usage(void);
     59 
     60 PUFFSOP_PROTOS(portal);
     61 
     62 #define PORTAL_ROOT NULL
     63 #define METADATASIZE (sizeof(int) + sizeof(size_t))
     64 
     65 qelem q;
     66 int readcfg, sigchild;
     67 const char *cfg;
     68 
     69 static void
     70 usage(void)
     71 {
     72 
     73 	errx(1, "usage: %s [-o options] /path/portal.conf mount_point",
     74 	    getprogname());
     75 }
     76 
     77 static void
     78 sighup(int sig)
     79 {
     80 
     81 	readcfg = 1;
     82 }
     83 
     84 static void
     85 sigcry(int sig)
     86 {
     87 
     88 	sigchild = 1;
     89 }
     90 
     91 static void
     92 portal_loopfn(struct puffs_usermount *pu)
     93 {
     94 
     95 	if (readcfg)
     96 		conf_read(&q, cfg);
     97 	readcfg = 0;
     98 
     99 	if (sigchild) {
    100 		sigchild = 0;
    101 		while (waitpid(-1, NULL, WNOHANG) != -1)
    102 			continue;
    103 	}
    104 }
    105 
    106 #define PUFBUF_FD	1
    107 #define PUFBUF_DATA	2
    108 
    109 #define CMSIZE (sizeof(struct cmsghdr) + sizeof(int))
    110 
    111 /* receive file descriptor produced by our child process */
    112 static int
    113 readfd(struct puffs_framebuf *pufbuf, int fd, int *done)
    114 {
    115 	struct cmsghdr *cmp;
    116 	struct msghdr msg;
    117 	struct iovec iov;
    118 	ssize_t n;
    119 	int error, rv;
    120 
    121 	rv = 0;
    122 	cmp = emalloc(CMSG_SPACE(sizeof(int)));
    123 
    124 	iov.iov_base = &error;
    125 	iov.iov_len = sizeof(int);
    126 	msg.msg_iov = &iov;
    127 	msg.msg_iovlen = 1;
    128 	msg.msg_name = NULL;
    129 	msg.msg_namelen = 0;
    130 	msg.msg_control = cmp;
    131 	msg.msg_controllen = CMSG_SPACE(sizeof(int));
    132 
    133 	n = recvmsg(fd, &msg, 0);
    134 	if (n == -1) {
    135 		rv = errno;
    136 		goto out;
    137 	}
    138 	if (n == 0) {
    139 		rv = ECONNRESET;
    140 		goto out;
    141 	}
    142 
    143 	/* the data for the server */
    144 	puffs_framebuf_putdata_atoff(pufbuf, 0, &error, sizeof(int));
    145 	if (error) {
    146 		rv = error;
    147 		goto out;
    148 	}
    149 	puffs_framebuf_putdata_atoff(pufbuf, sizeof(int),
    150 	    CMSG_DATA(cmp), sizeof(int));
    151 	*done = 1;
    152 
    153  out:
    154 	free(cmp);
    155 	return rv;
    156 }
    157 
    158 /*
    159  * receive data from provider
    160  *
    161  * XXX: should read directly into the buffer and adjust offsets
    162  * instead of doing memcpy
    163  */
    164 static int
    165 readdata(struct puffs_framebuf *pufbuf, int fd, int *done)
    166 {
    167 	char buf[1024];
    168 	size_t max;
    169 	ssize_t n;
    170 	size_t moved;
    171 
    172 	/* don't override metadata */
    173 	if (puffs_framebuf_telloff(pufbuf) == 0)
    174 		puffs_framebuf_seekset(pufbuf, METADATASIZE);
    175 	puffs_framebuf_getdata_atoff(pufbuf, sizeof(int), &max, sizeof(size_t));
    176 	moved = puffs_framebuf_tellsize(pufbuf) - METADATASIZE;
    177 	assert(max >= moved);
    178 	max -= moved;
    179 
    180 	do {
    181 		n = read(fd, buf, MIN(sizeof(buf), max));
    182 		if (n == 0) {
    183 			if (moved)
    184 				break;
    185 			else
    186 				return -1; /* caught by read */
    187 		}
    188 		if (n < 0) {
    189 			if (moved)
    190 				return 0;
    191 
    192 			if (errno != EAGAIN)
    193 				return errno;
    194 			else
    195 				return 0;
    196 		}
    197 
    198 		puffs_framebuf_putdata(pufbuf, buf, n);
    199 		moved += n;
    200 		max -= n;
    201 	} while (max > 0);
    202 
    203 	*done = 1;
    204 
    205 	return 0;
    206 }
    207 
    208 static int
    209 portal_frame_rf(struct puffs_usermount *pu, struct puffs_framebuf *pufbuf,
    210 	int fd, int *done)
    211 {
    212 	int type;
    213 
    214 	if (puffs_framebuf_getdata_atoff(pufbuf, 0, &type, sizeof(int)) == -1)
    215 		return EINVAL;
    216 
    217 	if (type == PUFBUF_FD)
    218 		return readfd(pufbuf, fd, done);
    219 	else if (type == PUFBUF_DATA)
    220 		return readdata(pufbuf, fd, done);
    221 	else
    222 		abort();
    223 }
    224 
    225 static int
    226 portal_frame_wf(struct puffs_usermount *pu, struct puffs_framebuf *pufbuf,
    227 	int fd, int *done)
    228 {
    229 	void *win;
    230 	size_t pbsize, pboff, winlen;
    231 	ssize_t n;
    232 	int error;
    233 
    234 	pboff = puffs_framebuf_telloff(pufbuf);
    235 	pbsize = puffs_framebuf_tellsize(pufbuf);
    236 	error = 0;
    237 
    238 	do {
    239 		assert(pbsize > pboff);
    240 		winlen = pbsize - pboff;
    241 		if (puffs_framebuf_getwindow(pufbuf, pboff, &win, &winlen)==-1)
    242 			return errno;
    243 		n = write(fd, win, winlen);
    244 		if (n == 0) {
    245 			if (pboff != 0)
    246 				break;
    247 			else
    248 				return -1; /* caught by node_write */
    249 		}
    250 		if (n < 0) {
    251 			if (pboff != 0)
    252 				break;
    253 
    254 			if (errno != EAGAIN)
    255 				return errno;
    256 			return 0;
    257 		}
    258 
    259 		pboff += n;
    260 		puffs_framebuf_seekset(pufbuf, pboff);
    261 	} while (pboff != pbsize);
    262 
    263 	*done = 1;
    264 	puffs_framebuf_putdata_atoff(pufbuf, 0, &pboff, sizeof(size_t));
    265 	return error;
    266 }
    267 
    268 /* transfer file descriptor to master file server */
    269 static int
    270 sendfd(int s, int fd, int error)
    271 {
    272 	struct cmsghdr *cmp;
    273 	struct msghdr msg;
    274 	struct iovec iov;
    275 	ssize_t n;
    276 	int rv;
    277 
    278 	rv = 0;
    279 	cmp = emalloc(CMSG_LEN(sizeof(int)));
    280 
    281 	iov.iov_base = &error;
    282 	iov.iov_len = sizeof(int);
    283 
    284 	msg.msg_iov = &iov;
    285 	msg.msg_iovlen = 1;
    286 	msg.msg_name = NULL;
    287 	msg.msg_namelen = 0;
    288 	if (error == 0) {
    289 		cmp->cmsg_level = SOL_SOCKET;
    290 		cmp->cmsg_type = SCM_RIGHTS;
    291 		cmp->cmsg_len = CMSG_LEN(sizeof(int));
    292 
    293 		msg.msg_control = cmp;
    294 		msg.msg_controllen = CMSG_LEN(sizeof(int));
    295 		*(int *)CMSG_DATA(cmp) = fd;
    296 	} else {
    297 		msg.msg_control = NULL;
    298 		msg.msg_controllen = 0;
    299 	}
    300 
    301 	n = sendmsg(s, &msg, 0);
    302 	if (n == -1)
    303 		rv = errno;
    304 	else if (n < (ssize_t)sizeof(int))
    305 		rv = EPROTO;
    306 
    307 	free(cmp);
    308 	return rv;
    309 }
    310 
    311 /*
    312  * Produce I/O file descriptor by forking (like original portald).
    313  *
    314  * child: run provider and transfer produced fd to parent
    315  * parent: yield until child produces fd.  receive it and store it.
    316  */
    317 static int
    318 provide(struct puffs_usermount *pu, struct portal_node *portn,
    319 	struct portal_cred *portc, char **v)
    320 {
    321 	struct puffs_cc *pcc = puffs_cc_getcc(pu);
    322 	struct puffs_framebuf *pufbuf;
    323 	int s[2];
    324 	int fd, error;
    325 	int data;
    326 
    327 	pufbuf = puffs_framebuf_make();
    328 	if (pufbuf == NULL)
    329 		return ENOMEM;
    330 
    331 	data = PUFBUF_FD;
    332 	if (puffs_framebuf_putdata(pufbuf, &data, sizeof(int)) == -1)
    333 		goto bad;
    334 
    335 	if (socketpair(AF_LOCAL, SOCK_STREAM, 0, s) == -1)
    336 		goto bad;
    337 
    338 	switch (fork()) {
    339 	case -1:
    340 		goto bad;
    341 	case 0:
    342 		error = activate_argv(portc, portn->path, v, &fd);
    343 		sendfd(s[1], fd, error);
    344 		exit(0);
    345 	default:
    346 		puffs_framev_addfd(pu, s[0], PUFFS_FBIO_READ);
    347 		puffs_framev_enqueue_directreceive(pcc, s[0], pufbuf, 0);
    348 		puffs_framev_removefd(pu, s[0], 0);
    349 		close(s[0]);
    350 		close(s[1]);
    351 
    352 		if (puffs_framebuf_tellsize(pufbuf) < sizeof(int)) {
    353 			errno = EIO;
    354 			goto bad;
    355 		}
    356 		puffs_framebuf_getdata_atoff(pufbuf, 0, &error, sizeof(int));
    357 		if (error) {
    358 			errno = error;
    359 			goto bad;
    360 		}
    361 
    362 		if (puffs_framebuf_tellsize(pufbuf) != 2*sizeof(int)) {
    363 			errno = EIO;
    364 			goto bad;
    365 		}
    366 
    367 		puffs_framebuf_getdata_atoff(pufbuf, sizeof(int),
    368 		    &fd, sizeof(int));
    369 		puffs_framebuf_destroy(pufbuf);
    370 
    371 		data = 1;
    372 		if (ioctl(fd, FIONBIO, &data) == -1)
    373 			return errno;
    374 
    375 		if (puffs_framev_addfd(pu, fd, PUFFS_FBIO_WRITE) == -1)
    376 			return errno;
    377 
    378 		portn->fd = fd;
    379 		return 0;
    380 	}
    381 
    382  bad:
    383 	puffs_framebuf_destroy(pufbuf);
    384 	return errno;
    385 }
    386 
    387 int
    388 main(int argc, char *argv[])
    389 {
    390 	extern char *optarg;
    391 	extern int optind;
    392 	struct puffs_usermount *pu;
    393 	struct puffs_ops *pops;
    394 	mntoptparse_t mp;
    395 	int pflags, mntflags;
    396 	int detach;
    397 	int ch;
    398 
    399 	setprogname(argv[0]);
    400 
    401 	mntflags = pflags = 0;
    402 	detach = 1;
    403 	while ((ch = getopt(argc, argv, "o:s")) != -1) {
    404 		switch (ch) {
    405 		case 'o':
    406 			mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags);
    407 			if (mp == NULL)
    408 				err(1, "getmntopts");
    409 			freemntopts(mp);
    410 			break;
    411 		case 's': /* stay on top */
    412 			detach = 0;
    413 			break;
    414 		default:
    415 			usage();
    416 			/*NOTREACHED*/
    417 		}
    418 	}
    419 	pflags |= PUFFS_KFLAG_NOCACHE | PUFFS_KFLAG_LOOKUP_FULLPNBUF;
    420 	if (pflags & PUFFS_FLAG_OPDUMP)
    421 		detach = 0;
    422 	argc -= optind;
    423 	argv += optind;
    424 
    425 	if (argc != 2)
    426 		usage();
    427 
    428 	PUFFSOP_INIT(pops);
    429 
    430 	PUFFSOP_SETFSNOP(pops, unmount);
    431 	PUFFSOP_SETFSNOP(pops, sync);
    432 	PUFFSOP_SETFSNOP(pops, statvfs);
    433 
    434 	PUFFSOP_SET(pops, portal, node, lookup);
    435 	PUFFSOP_SET(pops, portal, node, getattr);
    436 	PUFFSOP_SET(pops, portal, node, setattr);
    437 	PUFFSOP_SET(pops, portal, node, open);
    438 	PUFFSOP_SET(pops, portal, node, read);
    439 	PUFFSOP_SET(pops, portal, node, write);
    440 	PUFFSOP_SET(pops, portal, node, seek);
    441 	PUFFSOP_SET(pops, portal, node, poll);
    442 	PUFFSOP_SET(pops, portal, node, inactive);
    443 	PUFFSOP_SET(pops, portal, node, reclaim);
    444 
    445 	pu = puffs_init(pops, _PATH_PUFFS, "portal", NULL, pflags);
    446 	if (pu == NULL)
    447 		err(1, "init");
    448 
    449 	if (signal(SIGHUP, sighup) == SIG_ERR)
    450 		warn("cannot set sighup handler");
    451 	if (signal(SIGCHLD, sigcry) == SIG_ERR)
    452 		err(1, "cannot set sigchild handler");
    453 	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
    454 		err(1, "cannot ignore sigpipe");
    455 
    456 	readcfg = 0;
    457 	cfg = argv[0];
    458 	if (*cfg != '/')
    459 		errx(1, "need absolute path for config");
    460 	q.q_forw = q.q_back = &q;
    461 	if (conf_read(&q, cfg) == -1)
    462 		err(1, "cannot read cfg \"%s\"", cfg);
    463 
    464 	puffs_ml_setloopfn(pu, portal_loopfn);
    465 	puffs_framev_init(pu, portal_frame_rf, portal_frame_wf, NULL,NULL,NULL);
    466 
    467 	if (detach)
    468 		if (puffs_daemon(pu, 1, 1) == -1)
    469 			err(1, "puffs_daemon");
    470 
    471 	if (puffs_mount(pu,  argv[1], mntflags, PORTAL_ROOT) == -1)
    472 		err(1, "mount");
    473 	if (puffs_mainloop(pu) == -1)
    474 		err(1, "mainloop");
    475 
    476 	return 0;
    477 }
    478 
    479 static struct portal_node *
    480 makenode(const char *path)
    481 {
    482 	struct portal_node *portn;
    483 
    484 	portn = emalloc(sizeof(struct portal_node));
    485 	portn->path = estrdup(path);
    486 	portn->fd = -1;
    487 
    488 	return portn;
    489 }
    490 
    491 static void
    492 credtr(struct portal_cred *portc, const struct puffs_cred *puffc, int mode)
    493 {
    494 	memset(portc, 0, sizeof(struct portal_cred));
    495 
    496 	portc->pcr_flag = mode;
    497 	puffs_cred_getuid(puffc, &portc->pcr_uid);
    498 	puffs_cred_getgid(puffc, &portc->pcr_gid);
    499 	puffs_cred_getgroups(puffc, portc->pcr_groups,
    500 	    (short *)&portc->pcr_ngroups);
    501 }
    502 
    503 /*
    504  * XXX: we could also simply already resolve the name at this stage
    505  * instead of deferring it to open.  But doing it in open is how the
    506  * original portald does it, and I don't want to introduce any funny
    507  * incompatibilities.
    508  */
    509 int
    510 portal_node_lookup(struct puffs_usermount *pu, puffs_cookie_t opc,
    511 	struct puffs_newinfo *pni, const struct puffs_cn *pcn)
    512 {
    513 	struct portal_node *portn;
    514 
    515 	assert(opc == PORTAL_ROOT);
    516 
    517 	if (pcn->pcn_nameiop != NAMEI_LOOKUP
    518 	    && pcn->pcn_nameiop != NAMEI_CREATE)
    519 		return EOPNOTSUPP;
    520 
    521 	portn = makenode(pcn->pcn_name);
    522 	puffs_newinfo_setcookie(pni, portn);
    523 	puffs_newinfo_setvtype(pni, VREG);
    524 
    525 	pcn->pcn_flags &= ~NAMEI_REQUIREDIR;
    526 	pcn->pcn_consume = strlen(pcn->pcn_name) - pcn->pcn_namelen;
    527 
    528 	return 0;
    529 }
    530 
    531 int fakeid = 3;
    532 
    533 /* XXX: libpuffs'ize */
    534 int
    535 portal_node_getattr(struct puffs_usermount *pu, puffs_cookie_t opc,
    536 	struct vattr *va, const struct puffs_cred *pcr)
    537 {
    538 	struct timeval tv;
    539 	struct timespec ts;
    540 
    541 	puffs_vattr_null(va);
    542 	if (opc == PORTAL_ROOT) {
    543 		va->va_type = VDIR;
    544 		va->va_mode = 0777;
    545 		va->va_nlink = 2;
    546 	} else {
    547 		va->va_type = VREG;
    548 		va->va_mode = 0666;
    549 		va->va_nlink = 1;
    550 	}
    551 	va->va_uid = va->va_gid = 0;
    552 	va->va_fileid = fakeid++;
    553 	va->va_size = va->va_bytes = 0;
    554 	va->va_gen = 0;
    555 	va->va_rdev = PUFFS_VNOVAL;
    556 	va->va_blocksize = DEV_BSIZE;
    557 
    558 	gettimeofday(&tv, NULL);
    559 	TIMEVAL_TO_TIMESPEC(&tv, &ts);
    560 	va->va_atime = va->va_ctime = va->va_mtime = va->va_birthtime = ts;
    561 
    562 	return 0;
    563 }
    564 
    565 /* for writing, just pretend we care */
    566 int
    567 portal_node_setattr(struct puffs_usermount *pu, puffs_cookie_t opc,
    568 	const struct vattr *va, const struct puffs_cred *pcr)
    569 {
    570 
    571 	return 0;
    572 }
    573 
    574 int
    575 portal_node_open(struct puffs_usermount *pu, puffs_cookie_t opc, int mode,
    576 	const struct puffs_cred *pcr)
    577 {
    578 	struct portal_node *portn = opc;
    579 	struct portal_cred portc;
    580 	char **v;
    581 
    582 	if (opc == PORTAL_ROOT)
    583 		return 0;
    584 
    585 	if (mode & O_NONBLOCK)
    586 		return EOPNOTSUPP;
    587 
    588 	v = conf_match(&q, portn->path);
    589 	if (v == NULL)
    590 		return ENOENT;
    591 
    592 	credtr(&portc, pcr, mode);
    593 	return provide(pu, portn, &portc, v);
    594 }
    595 
    596 int
    597 portal_node_read(struct puffs_usermount *pu, puffs_cookie_t opc,
    598 	uint8_t *buf, off_t offset, size_t *resid,
    599 	const struct puffs_cred *pcr, int ioflag)
    600 {
    601 	struct puffs_cc *pcc = puffs_cc_getcc(pu);
    602 	struct portal_node *portn = opc;
    603 	struct puffs_framebuf *pufbuf;
    604 	size_t xfersize, winsize, boff;
    605 	void *win;
    606 	int rv, error;
    607 	int data, dummy;
    608 
    609 	assert(opc != PORTAL_ROOT);
    610 	error = 0;
    611 
    612 	/* if we can't (re-)enable it, treat it as EOF */
    613 	rv = puffs_framev_enablefd(pu, portn->fd, PUFFS_FBIO_READ);
    614 	if (rv == -1)
    615 		return 0;
    616 
    617 	pufbuf = puffs_framebuf_make();
    618 	data = PUFBUF_DATA;
    619 	puffs_framebuf_putdata(pufbuf, &data, sizeof(int));
    620 	puffs_framebuf_putdata(pufbuf, resid, sizeof(size_t));
    621 
    622 	/* if we are doing nodelay, do read directly */
    623 	if (ioflag & PUFFS_IO_NDELAY) {
    624 		rv = readdata(pufbuf, portn->fd, &dummy);
    625 		if (rv != 0) {
    626 			error = rv;
    627 			goto out;
    628 		}
    629 	} else {
    630 		rv = puffs_framev_enqueue_directreceive(pcc,
    631 		    portn->fd, pufbuf, 0);
    632 
    633 		if (rv == -1) {
    634 			error = errno;
    635 			goto out;
    636 		}
    637 	}
    638 
    639 	xfersize = puffs_framebuf_tellsize(pufbuf) - METADATASIZE;
    640 	if (xfersize == 0) {
    641 		assert(ioflag & PUFFS_IO_NDELAY);
    642 		error = EAGAIN;
    643 		goto out;
    644 	}
    645 
    646 	*resid -= xfersize;
    647 	boff = 0;
    648 	while (xfersize > 0) {
    649 		winsize = xfersize;
    650 		rv = puffs_framebuf_getwindow(pufbuf, METADATASIZE,
    651 		    &win, &winsize);
    652 		assert(rv == 0);
    653 		assert(winsize > 0);
    654 
    655 		memcpy(buf + boff, win, winsize);
    656 		xfersize -= winsize;
    657 		boff += winsize;
    658 	}
    659 
    660  out:
    661 	puffs_framev_disablefd(pu, portn->fd, PUFFS_FBIO_READ);
    662 	puffs_framebuf_destroy(pufbuf);
    663 
    664 	/* a trickery, from readdata() */
    665 	if (error == -1)
    666 		return 0;
    667 	return error;
    668 }
    669 
    670 int
    671 portal_node_write(struct puffs_usermount *pu, puffs_cookie_t opc,
    672 	uint8_t *buf, off_t offset, size_t *resid,
    673 	const struct puffs_cred *pcr, int ioflag)
    674 {
    675 	struct puffs_cc *pcc = puffs_cc_getcc(pu);
    676 	struct portal_node *portn = opc;
    677 	struct puffs_framebuf *pufbuf;
    678 	size_t written;
    679 	int error, rv, dummy;
    680 
    681 	assert(opc != PORTAL_ROOT);
    682 
    683 	pufbuf = puffs_framebuf_make();
    684 	puffs_framebuf_putdata(pufbuf, buf, *resid);
    685 
    686 	error = 0;
    687 	if (ioflag & PUFFS_IO_NDELAY) {
    688 		rv = portal_frame_wf(pu, pufbuf, portn->fd, &dummy);
    689 		if (rv) {
    690 			error = rv;
    691 			goto out;
    692 		}
    693 	} else  {
    694 		rv = puffs_framev_enqueue_directsend(pcc, portn->fd, pufbuf, 0);
    695 		if (rv == -1) {
    696 			error = errno;
    697 			goto out;
    698 		}
    699 	}
    700 
    701 	rv = puffs_framebuf_getdata_atoff(pufbuf, 0, &written, sizeof(size_t));
    702 	assert(rv == 0);
    703 	assert(written <= *resid);
    704 	*resid -= written;
    705 
    706  out:
    707 	puffs_framebuf_destroy(pufbuf);
    708 	if (error == -1)
    709 		error = 0;
    710 	return 0;
    711 }
    712 
    713 int
    714 portal_node_seek(struct puffs_usermount *pu, puffs_cookie_t opc,
    715 	off_t oldoff, off_t newoff, const struct puffs_cred *pcr)
    716 {
    717 	struct portal_node *portn = opc;
    718 
    719 	if (opc == PORTAL_ROOT || portn->fd == -1)
    720 		return EOPNOTSUPP;
    721 
    722 	if (lseek(portn->fd, newoff, SEEK_SET) == -1)
    723 		return errno;
    724 	return 0;
    725 }
    726 
    727 int
    728 portal_node_poll(struct puffs_usermount *pu, puffs_cookie_t opc, int *events)
    729 {
    730 	struct puffs_cc *pcc = puffs_cc_getcc(pu);
    731 	struct portal_node *portn = opc;
    732 	int what;
    733 
    734 	what = 0;
    735 	if (*events & POLLIN)
    736 		what |= PUFFS_FBIO_READ;
    737 	if (*events & POLLOUT)
    738 		what |= PUFFS_FBIO_WRITE;
    739 	if (*events & POLLERR)
    740 		what |= PUFFS_FBIO_ERROR;
    741 
    742 	if (puffs_framev_enqueue_waitevent(pcc, portn->fd, &what) == -1) {
    743 		*events = POLLERR;
    744 		return errno;
    745 	}
    746 
    747 	*events = 0;
    748 	if (what & PUFFS_FBIO_READ)
    749 		*events |= POLLIN;
    750 	if (what & PUFFS_FBIO_WRITE)
    751 		*events |= POLLOUT;
    752 	if (what & PUFFS_FBIO_ERROR)
    753 		*events |= POLLERR;
    754 
    755 	return 0;
    756 }
    757 
    758 int
    759 portal_node_inactive(struct puffs_usermount *pu, puffs_cookie_t opc)
    760 {
    761 
    762 	if (opc == PORTAL_ROOT)
    763 		return 0;
    764 
    765 	puffs_setback(puffs_cc_getcc(pu), PUFFS_SETBACK_NOREF_N1);
    766 	return 0;
    767 }
    768 
    769 int
    770 portal_node_reclaim(struct puffs_usermount *pu, puffs_cookie_t opc)
    771 {
    772 	struct portal_node *portn = opc;
    773 
    774 	if (portn->fd != -1) {
    775 		puffs_framev_removefd(pu, portn->fd, 0);
    776 		close(portn->fd);
    777 	}
    778 	free(portn->path);
    779 	free(portn);
    780 
    781 	return 0;
    782 }
    783