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puffs.c revision 1.62.2.3 
      1 /*	$NetBSD: puffs.c,v 1.62.2.3 2008/01/09 01:36:48 matt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2005, 2006, 2007  Antti Kantee.  All Rights Reserved.
      5  *
      6  * Development of this software was supported by the
      7  * Google Summer of Code program and the Ulla Tuominen Foundation.
      8  * The Google SoC project was mentored by Bill Studenmund.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     20  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     22  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     25  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if !defined(lint)
     34 __RCSID("$NetBSD: puffs.c,v 1.62.2.3 2008/01/09 01:36:48 matt Exp $");
     35 #endif /* !lint */
     36 
     37 #include <sys/param.h>
     38 #include <sys/mount.h>
     39 
     40 #include <assert.h>
     41 #include <err.h>
     42 #include <errno.h>
     43 #include <fcntl.h>
     44 #include <mntopts.h>
     45 #include <paths.h>
     46 #include <puffs.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <string.h>
     50 #include <syslog.h>
     51 #include <unistd.h>
     52 
     53 #include "puffs_priv.h"
     54 
     55 /* Most file systems want this for opts, so just give it to them */
     56 const struct mntopt puffsmopts[] = {
     57 	MOPT_STDOPTS,
     58 	PUFFSMOPT_STD,
     59 	MOPT_NULL,
     60 };
     61 
     62 #ifdef PUFFS_WITH_THREADS
     63 #include <pthread.h>
     64 pthread_mutex_t pu_lock = PTHREAD_MUTEX_INITIALIZER;
     65 #endif
     66 
     67 #define FILLOP(lower, upper)						\
     68 do {									\
     69 	if (pops->puffs_node_##lower)					\
     70 		opmask[PUFFS_VN_##upper] = 1;				\
     71 } while (/*CONSTCOND*/0)
     72 static void
     73 fillvnopmask(struct puffs_ops *pops, uint8_t *opmask)
     74 {
     75 
     76 	memset(opmask, 0, PUFFS_VN_MAX);
     77 
     78 	FILLOP(create,   CREATE);
     79 	FILLOP(mknod,    MKNOD);
     80 	FILLOP(open,     OPEN);
     81 	FILLOP(close,    CLOSE);
     82 	FILLOP(access,   ACCESS);
     83 	FILLOP(getattr,  GETATTR);
     84 	FILLOP(setattr,  SETATTR);
     85 	FILLOP(poll,     POLL); /* XXX: not ready in kernel */
     86 	FILLOP(mmap,     MMAP);
     87 	FILLOP(fsync,    FSYNC);
     88 	FILLOP(seek,     SEEK);
     89 	FILLOP(remove,   REMOVE);
     90 	FILLOP(link,     LINK);
     91 	FILLOP(rename,   RENAME);
     92 	FILLOP(mkdir,    MKDIR);
     93 	FILLOP(rmdir,    RMDIR);
     94 	FILLOP(symlink,  SYMLINK);
     95 	FILLOP(readdir,  READDIR);
     96 	FILLOP(readlink, READLINK);
     97 	FILLOP(reclaim,  RECLAIM);
     98 	FILLOP(inactive, INACTIVE);
     99 	FILLOP(print,    PRINT);
    100 	FILLOP(read,     READ);
    101 	FILLOP(write,    WRITE);
    102 }
    103 #undef FILLOP
    104 
    105 /*
    106  * Go over all framev entries and write everything we can.  This is
    107  * mostly for the benefit of delivering "unmount" to the kernel.
    108  */
    109 static void
    110 finalpush(struct puffs_usermount *pu)
    111 {
    112 	struct puffs_fctrl_io *fio;
    113 
    114 	LIST_FOREACH(fio, &pu->pu_ios, fio_entries) {
    115 		if (fio->stat & FIO_WRGONE)
    116 			continue;
    117 
    118 		puffs_framev_output(pu, fio->fctrl, fio);
    119 	}
    120 }
    121 
    122 /*ARGSUSED*/
    123 static void
    124 puffs_defaulterror(struct puffs_usermount *pu, uint8_t type,
    125 	int error, const char *str, void *cookie)
    126 {
    127 
    128 	fprintf(stderr, "abort: type %d, error %d, cookie %p (%s)\n",
    129 	    type, error, cookie, str);
    130 	abort();
    131 }
    132 
    133 int
    134 puffs_getselectable(struct puffs_usermount *pu)
    135 {
    136 
    137 	return pu->pu_fd;
    138 }
    139 
    140 uint64_t
    141 puffs__nextreq(struct puffs_usermount *pu)
    142 {
    143 	uint64_t rv;
    144 
    145 	PU_LOCK();
    146 	rv = pu->pu_nextreq++;
    147 	PU_UNLOCK();
    148 
    149 	return rv;
    150 }
    151 
    152 int
    153 puffs_setblockingmode(struct puffs_usermount *pu, int mode)
    154 {
    155 	int rv, x;
    156 
    157 	assert(puffs_getstate(pu) == PUFFS_STATE_RUNNING);
    158 
    159 	if (mode != PUFFSDEV_BLOCK && mode != PUFFSDEV_NONBLOCK) {
    160 		errno = EINVAL;
    161 		return -1;
    162 	}
    163 
    164 	x = mode;
    165 	rv = ioctl(pu->pu_fd, FIONBIO, &x);
    166 
    167 	if (rv == 0) {
    168 		if (mode == PUFFSDEV_BLOCK)
    169 			pu->pu_state &= ~PU_ASYNCFD;
    170 		else
    171 			pu->pu_state |= PU_ASYNCFD;
    172 	}
    173 
    174 	return rv;
    175 }
    176 
    177 int
    178 puffs_getstate(struct puffs_usermount *pu)
    179 {
    180 
    181 	return pu->pu_state & PU_STATEMASK;
    182 }
    183 
    184 void
    185 puffs_setstacksize(struct puffs_usermount *pu, size_t ss)
    186 {
    187 	long psize;
    188 	int stackshift;
    189 
    190 	psize = sysconf(_SC_PAGESIZE);
    191 	if (ss < 2*psize) {
    192 		ss = 2*psize;
    193 		fprintf(stderr, "puffs_setstacksize: adjusting stacksize "
    194 		    "to minimum %zu\n", ss);
    195 	}
    196 
    197 	assert(puffs_getstate(pu) == PUFFS_STATE_BEFOREMOUNT);
    198 	stackshift = -1;
    199 	while (ss) {
    200 		ss >>= 1;
    201 		stackshift++;
    202 	}
    203 	pu->pu_cc_stackshift = stackshift;
    204 }
    205 
    206 struct puffs_pathobj *
    207 puffs_getrootpathobj(struct puffs_usermount *pu)
    208 {
    209 	struct puffs_node *pnr;
    210 
    211 	pnr = pu->pu_pn_root;
    212 	if (pnr == NULL) {
    213 		errno = ENOENT;
    214 		return NULL;
    215 	}
    216 
    217 	return &pnr->pn_po;
    218 }
    219 
    220 void
    221 puffs_setroot(struct puffs_usermount *pu, struct puffs_node *pn)
    222 {
    223 
    224 	pu->pu_pn_root = pn;
    225 }
    226 
    227 struct puffs_node *
    228 puffs_getroot(struct puffs_usermount *pu)
    229 {
    230 
    231 	return pu->pu_pn_root;
    232 }
    233 
    234 void
    235 puffs_setrootinfo(struct puffs_usermount *pu, enum vtype vt,
    236 	vsize_t vsize, dev_t rdev)
    237 {
    238 	struct puffs_kargs *pargs = pu->pu_kargp;
    239 
    240 	if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT) {
    241 		warnx("puffs_setrootinfo: call has effect only "
    242 		    "before mount\n");
    243 		return;
    244 	}
    245 
    246 	pargs->pa_root_vtype = vt;
    247 	pargs->pa_root_vsize = vsize;
    248 	pargs->pa_root_rdev = rdev;
    249 }
    250 
    251 void *
    252 puffs_getspecific(struct puffs_usermount *pu)
    253 {
    254 
    255 	return pu->pu_privdata;
    256 }
    257 
    258 size_t
    259 puffs_getmaxreqlen(struct puffs_usermount *pu)
    260 {
    261 
    262 	return pu->pu_maxreqlen;
    263 }
    264 
    265 void
    266 puffs_setmaxreqlen(struct puffs_usermount *pu, size_t reqlen)
    267 {
    268 
    269 	if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT)
    270 		warnx("puffs_setmaxreqlen: call has effect only "
    271 		    "before mount\n");
    272 
    273 	pu->pu_kargp->pa_maxmsglen = reqlen;
    274 }
    275 
    276 void
    277 puffs_setfhsize(struct puffs_usermount *pu, size_t fhsize, int flags)
    278 {
    279 
    280 	if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT)
    281 		warnx("puffs_setfhsize: call has effect only before mount\n");
    282 
    283 	pu->pu_kargp->pa_fhsize = fhsize;
    284 	pu->pu_kargp->pa_fhflags = flags;
    285 }
    286 
    287 void
    288 puffs_setncookiehash(struct puffs_usermount *pu, int nhash)
    289 {
    290 
    291 	if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT)
    292 		warnx("puffs_setfhsize: call has effect only before mount\n");
    293 
    294 	pu->pu_kargp->pa_nhashbuckets = nhash;
    295 }
    296 
    297 void
    298 puffs_set_pathbuild(struct puffs_usermount *pu, pu_pathbuild_fn fn)
    299 {
    300 
    301 	pu->pu_pathbuild = fn;
    302 }
    303 
    304 void
    305 puffs_set_pathtransform(struct puffs_usermount *pu, pu_pathtransform_fn fn)
    306 {
    307 
    308 	pu->pu_pathtransform = fn;
    309 }
    310 
    311 void
    312 puffs_set_pathcmp(struct puffs_usermount *pu, pu_pathcmp_fn fn)
    313 {
    314 
    315 	pu->pu_pathcmp = fn;
    316 }
    317 
    318 void
    319 puffs_set_pathfree(struct puffs_usermount *pu, pu_pathfree_fn fn)
    320 {
    321 
    322 	pu->pu_pathfree = fn;
    323 }
    324 
    325 void
    326 puffs_set_namemod(struct puffs_usermount *pu, pu_namemod_fn fn)
    327 {
    328 
    329 	pu->pu_namemod = fn;
    330 }
    331 
    332 void
    333 puffs_set_errnotify(struct puffs_usermount *pu, pu_errnotify_fn fn)
    334 {
    335 
    336 	pu->pu_errnotify = fn;
    337 }
    338 
    339 void
    340 puffs_set_cmap(struct puffs_usermount *pu, pu_cmap_fn fn)
    341 {
    342 
    343 	pu->pu_cmap = fn;
    344 }
    345 
    346 void
    347 puffs_ml_setloopfn(struct puffs_usermount *pu, puffs_ml_loop_fn lfn)
    348 {
    349 
    350 	pu->pu_ml_lfn = lfn;
    351 }
    352 
    353 void
    354 puffs_ml_settimeout(struct puffs_usermount *pu, struct timespec *ts)
    355 {
    356 
    357 	if (ts == NULL) {
    358 		pu->pu_ml_timep = NULL;
    359 	} else {
    360 		pu->pu_ml_timeout = *ts;
    361 		pu->pu_ml_timep = &pu->pu_ml_timeout;
    362 	}
    363 }
    364 
    365 void
    366 puffs_set_prepost(struct puffs_usermount *pu,
    367 	pu_prepost_fn pre, pu_prepost_fn pst)
    368 {
    369 
    370 	pu->pu_oppre = pre;
    371 	pu->pu_oppost = pst;
    372 }
    373 
    374 void
    375 puffs_setback(struct puffs_cc *pcc, int whatback)
    376 {
    377 	struct puffs_req *preq = puffs__framebuf_getdataptr(pcc->pcc_pb);
    378 
    379 	assert(PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VN && (
    380 	    preq->preq_optype == PUFFS_VN_OPEN ||
    381 	    preq->preq_optype == PUFFS_VN_MMAP ||
    382 	    preq->preq_optype == PUFFS_VN_REMOVE ||
    383 	    preq->preq_optype == PUFFS_VN_RMDIR ||
    384 	    preq->preq_optype == PUFFS_VN_INACTIVE));
    385 
    386 	preq->preq_setbacks |= whatback & PUFFS_SETBACK_MASK;
    387 }
    388 
    389 int
    390 puffs_daemon(struct puffs_usermount *pu, int nochdir, int noclose)
    391 {
    392 	ssize_t n;
    393 	int parent, value, fd;
    394 
    395 	if (pipe(pu->pu_dpipe) == -1)
    396 		return -1;
    397 
    398 	switch (fork()) {
    399 	case -1:
    400 		return -1;
    401 	case 0:
    402 		parent = 0;
    403 		break;
    404 	default:
    405 		parent = 1;
    406 		break;
    407 	}
    408 	pu->pu_state |= PU_PUFFSDAEMON;
    409 
    410 	if (parent) {
    411 		n = read(pu->pu_dpipe[0], &value, sizeof(int));
    412 		if (n == -1)
    413 			err(1, "puffs_daemon");
    414 		assert(n == sizeof(value));
    415 		if (value) {
    416 			errno = value;
    417 			err(1, "puffs_daemon");
    418 		}
    419 		exit(0);
    420 	} else {
    421 		if (setsid() == -1)
    422 			goto fail;
    423 
    424 		if (!nochdir)
    425 			chdir("/");
    426 
    427 		if (!noclose) {
    428 			fd = open(_PATH_DEVNULL, O_RDWR, 0);
    429 			if (fd == -1)
    430 				goto fail;
    431 			dup2(fd, STDIN_FILENO);
    432 			dup2(fd, STDOUT_FILENO);
    433 			dup2(fd, STDERR_FILENO);
    434 			if (fd > STDERR_FILENO)
    435 				close(fd);
    436 		}
    437 		return 0;
    438 	}
    439 
    440  fail:
    441 	n = write(pu->pu_dpipe[1], &errno, sizeof(int));
    442 	assert(n == 4);
    443 	return -1;
    444 }
    445 
    446 int
    447 puffs_mount(struct puffs_usermount *pu, const char *dir, int mntflags,
    448 	void *cookie)
    449 {
    450 	char rp[MAXPATHLEN];
    451 	ssize_t n;
    452 	int rv, fd, sverrno;
    453 	char *comfd;
    454 
    455 	pu->pu_kargp->pa_root_cookie = cookie;
    456 
    457 	/* XXXkludgehere */
    458 	/* kauth doesn't provide this service any longer */
    459 	if (geteuid() != 0)
    460 		mntflags |= MNT_NOSUID | MNT_NODEV;
    461 
    462 	if (realpath(dir, rp) == NULL) {
    463 		rv = -1;
    464 		goto out;
    465 	}
    466 
    467 	if (strcmp(dir, rp) != 0) {
    468 		warnx("puffs_mount: \"%s\" is a relative path.", dir);
    469 		warnx("puffs_mount: using \"%s\" instead.", rp);
    470 	}
    471 
    472 	/*
    473 	 * Undocumented...  Well, documented only here.
    474 	 *
    475 	 * This is used for imaginative purposes.  If the env variable is
    476 	 * set, puffs_mount() doesn't do the regular mount procedure.
    477 	 * Rather, it crams the mount data down the comfd and sets comfd as
    478 	 * the puffs descriptor.
    479 	 *
    480 	 * This shouldn't be used unless you can read my mind ( ... or write
    481 	 * it, not to mention execute it, but that's starting to get silly).
    482 	 */
    483 	if ((comfd = getenv("PUFFS_COMFD")) != NULL) {
    484 		size_t len;
    485 
    486 		if (sscanf(comfd, "%d", &pu->pu_fd) != 1) {
    487 			errno = EINVAL;
    488 			rv = -1;
    489 			goto out;
    490 		}
    491 		/* check that what we got at least resembles an fd */
    492 		if (fcntl(pu->pu_fd, F_GETFL) == -1) {
    493 			rv = -1;
    494 			goto out;
    495 		}
    496 
    497 		len = strlen(dir)+1;
    498 
    499 #define allwrite(buf, len)						\
    500 do {									\
    501 	ssize_t al_rv;							\
    502 	al_rv = write(pu->pu_fd, buf, len);				\
    503 	if (al_rv != len) {						\
    504 		if (al_rv != -1)					\
    505 			errno = EIO;					\
    506 		rv = -1;						\
    507 		abort();\
    508 		goto out;						\
    509 	}								\
    510 } while (/*CONSTCOND*/0)
    511 		allwrite(&len, sizeof(len));
    512 		allwrite(dir, len);
    513 		len = strlen(pu->pu_kargp->pa_mntfromname)+1;
    514 		allwrite(&len, sizeof(len));
    515 		allwrite(pu->pu_kargp->pa_mntfromname, len);
    516 		allwrite(&mntflags, sizeof(mntflags));
    517 		allwrite(pu->pu_kargp, sizeof(*pu->pu_kargp));
    518 		allwrite(&pu->pu_flags, sizeof(pu->pu_flags));
    519 #undef allwrite
    520 
    521 		rv = 0;
    522 	} else {
    523 		fd = open(_PATH_PUFFS, O_RDWR);
    524 		if (fd == -1) {
    525 			warnx("puffs_mount: cannot open %s", _PATH_PUFFS);
    526 			rv = -1;
    527 			goto out;
    528 		}
    529 		if (fd <= 2)
    530 			warnx("puffs_mount: device fd %d (<= 2), sure this is "
    531 			    "what you want?", fd);
    532 
    533 		pu->pu_kargp->pa_fd = pu->pu_fd = fd;
    534 		if ((rv = mount(MOUNT_PUFFS, rp, mntflags,
    535 		    pu->pu_kargp, sizeof(struct puffs_kargs))) == -1)
    536 			goto out;
    537 	}
    538 
    539 	PU_SETSTATE(pu, PUFFS_STATE_RUNNING);
    540 
    541  out:
    542 	if (rv != 0)
    543 		sverrno = errno;
    544 	else
    545 		sverrno = 0;
    546 	free(pu->pu_kargp);
    547 	pu->pu_kargp = NULL;
    548 
    549 	if (pu->pu_state & PU_PUFFSDAEMON) {
    550 		n = write(pu->pu_dpipe[1], &sverrno, sizeof(int));
    551 		assert(n == 4);
    552 		close(pu->pu_dpipe[0]);
    553 		close(pu->pu_dpipe[1]);
    554 	}
    555 
    556 	errno = sverrno;
    557 	return rv;
    558 }
    559 
    560 struct puffs_usermount *
    561 _puffs_init(int develv, struct puffs_ops *pops, const char *mntfromname,
    562 	const char *puffsname, void *priv, uint32_t pflags)
    563 {
    564 	struct puffs_usermount *pu;
    565 	struct puffs_kargs *pargs;
    566 	int sverrno;
    567 
    568 	if (develv != PUFFS_DEVEL_LIBVERSION) {
    569 		warnx("puffs_init: mounting with lib version %d, need %d",
    570 		    develv, PUFFS_DEVEL_LIBVERSION);
    571 		errno = EINVAL;
    572 		return NULL;
    573 	}
    574 
    575 	pu = malloc(sizeof(struct puffs_usermount));
    576 	if (pu == NULL)
    577 		goto failfree;
    578 	memset(pu, 0, sizeof(struct puffs_usermount));
    579 
    580 	pargs = pu->pu_kargp = malloc(sizeof(struct puffs_kargs));
    581 	if (pargs == NULL)
    582 		goto failfree;
    583 	memset(pargs, 0, sizeof(struct puffs_kargs));
    584 
    585 	pargs->pa_vers = PUFFSDEVELVERS | PUFFSVERSION;
    586 	pargs->pa_flags = PUFFS_FLAG_KERN(pflags);
    587 	fillvnopmask(pops, pargs->pa_vnopmask);
    588 	(void)strlcpy(pargs->pa_typename, puffsname,
    589 	    sizeof(pargs->pa_typename));
    590 	(void)strlcpy(pargs->pa_mntfromname, mntfromname,
    591 	    sizeof(pargs->pa_mntfromname));
    592 
    593 	puffs_zerostatvfs(&pargs->pa_svfsb);
    594 	pargs->pa_root_cookie = NULL;
    595 	pargs->pa_root_vtype = VDIR;
    596 	pargs->pa_root_vsize = 0;
    597 	pargs->pa_root_rdev = 0;
    598 	pargs->pa_maxmsglen = 0;
    599 
    600 	pu->pu_flags = pflags;
    601 	pu->pu_ops = *pops;
    602 	free(pops); /* XXX */
    603 
    604 	pu->pu_privdata = priv;
    605 	pu->pu_cc_stackshift = PUFFS_CC_STACKSHIFT_DEFAULT;
    606 	LIST_INIT(&pu->pu_pnodelst);
    607 	LIST_INIT(&pu->pu_ios);
    608 	LIST_INIT(&pu->pu_ios_rmlist);
    609 	LIST_INIT(&pu->pu_ccnukelst);
    610 	TAILQ_INIT(&pu->pu_sched);
    611 	TAILQ_INIT(&pu->pu_exq);
    612 
    613 	pu->pu_framectrl[PU_FRAMECTRL_FS].rfb = puffs_fsframe_read;
    614 	pu->pu_framectrl[PU_FRAMECTRL_FS].wfb = puffs_fsframe_write;
    615 	pu->pu_framectrl[PU_FRAMECTRL_FS].cmpfb = puffs_fsframe_cmp;
    616 	pu->pu_framectrl[PU_FRAMECTRL_FS].gotfb = puffs_fsframe_gotframe;
    617 	pu->pu_framectrl[PU_FRAMECTRL_FS].fdnotfn = puffs_framev_unmountonclose;
    618 
    619 	/* defaults for some user-settable translation functions */
    620 	pu->pu_cmap = NULL; /* identity translation */
    621 
    622 	pu->pu_pathbuild = puffs_stdpath_buildpath;
    623 	pu->pu_pathfree = puffs_stdpath_freepath;
    624 	pu->pu_pathcmp = puffs_stdpath_cmppath;
    625 	pu->pu_pathtransform = NULL;
    626 	pu->pu_namemod = NULL;
    627 
    628 	pu->pu_errnotify = puffs_defaulterror;
    629 
    630 	PU_SETSTATE(pu, PUFFS_STATE_BEFOREMOUNT);
    631 
    632 	return pu;
    633 
    634  failfree:
    635 	/* can't unmount() from here for obvious reasons */
    636 	sverrno = errno;
    637 	free(pu);
    638 	errno = sverrno;
    639 	return NULL;
    640 }
    641 
    642 /*
    643  * XXX: there's currently no clean way to request unmount from
    644  * within the user server, so be very brutal about it.
    645  */
    646 /*ARGSUSED1*/
    647 int
    648 puffs_exit(struct puffs_usermount *pu, int force)
    649 {
    650 	struct puffs_node *pn;
    651 
    652 	force = 1; /* currently */
    653 
    654 	if (pu->pu_fd)
    655 		close(pu->pu_fd);
    656 
    657 	while ((pn = LIST_FIRST(&pu->pu_pnodelst)) != NULL)
    658 		puffs_pn_put(pn);
    659 
    660 	finalpush(pu);
    661 	puffs_framev_exit(pu);
    662 	if (pu->pu_state & PU_HASKQ)
    663 		close(pu->pu_kq);
    664 	free(pu);
    665 
    666 	return 0; /* always succesful for now, WILL CHANGE */
    667 }
    668 
    669 int
    670 puffs_mainloop(struct puffs_usermount *pu)
    671 {
    672 	struct puffs_framectrl *pfctrl;
    673 	struct puffs_fctrl_io *fio;
    674 	struct puffs_cc *pcc;
    675 	struct kevent *curev;
    676 	size_t nchanges;
    677 	int ndone, sverrno;
    678 
    679 	assert(puffs_getstate(pu) >= PUFFS_STATE_RUNNING);
    680 
    681 	pu->pu_kq = kqueue();
    682 	if (pu->pu_kq == -1)
    683 		goto out;
    684 	pu->pu_state |= PU_HASKQ;
    685 
    686 	puffs_setblockingmode(pu, PUFFSDEV_NONBLOCK);
    687 	if (puffs__framev_addfd_ctrl(pu, puffs_getselectable(pu),
    688 	    PUFFS_FBIO_READ | PUFFS_FBIO_WRITE,
    689 	    &pu->pu_framectrl[PU_FRAMECTRL_FS]) == -1)
    690 		goto out;
    691 
    692 	curev = realloc(pu->pu_evs, (2*pu->pu_nfds)*sizeof(struct kevent));
    693 	if (curev == NULL)
    694 		goto out;
    695 	pu->pu_evs = curev;
    696 
    697 	LIST_FOREACH(fio, &pu->pu_ios, fio_entries) {
    698 		EV_SET(curev, fio->io_fd, EVFILT_READ, EV_ADD,
    699 		    0, 0, (uintptr_t)fio);
    700 		curev++;
    701 		EV_SET(curev, fio->io_fd, EVFILT_WRITE, EV_ADD | EV_DISABLE,
    702 		    0, 0, (uintptr_t)fio);
    703 		curev++;
    704 	}
    705 	if (kevent(pu->pu_kq, pu->pu_evs, 2*pu->pu_nfds, NULL, 0, NULL) == -1)
    706 		goto out;
    707 
    708 	pu->pu_state |= PU_INLOOP;
    709 
    710 	while (puffs_getstate(pu) != PUFFS_STATE_UNMOUNTED) {
    711 		if (pu->pu_ml_lfn)
    712 			pu->pu_ml_lfn(pu);
    713 
    714 		/* XXX: can we still do these optimizations? */
    715 #if 0
    716 		/*
    717 		 * Do this here, because:
    718 		 *  a) loopfunc might generate some results
    719 		 *  b) it's still "after" event handling (except for round 1)
    720 		 */
    721 		if (puffs_req_putput(ppr) == -1)
    722 			goto out;
    723 		puffs_req_resetput(ppr);
    724 
    725 		/* micro optimization: skip kevent syscall if possible */
    726 		if (pu->pu_nfds == 1 && pu->pu_ml_timep == NULL
    727 		    && (pu->pu_state & PU_ASYNCFD) == 0) {
    728 			pfctrl = XXX->fctrl;
    729 			puffs_framev_input(pu, pfctrl, XXX);
    730 			continue;
    731 		}
    732 #endif
    733 
    734 		/* else: do full processing */
    735 		/* Don't bother worrying about O(n) for now */
    736 		LIST_FOREACH(fio, &pu->pu_ios, fio_entries) {
    737 			if (fio->stat & FIO_WRGONE)
    738 				continue;
    739 
    740 			pfctrl = fio->fctrl;
    741 
    742 			/*
    743 			 * Try to write out everything to avoid the
    744 			 * need for enabling EVFILT_WRITE.  The likely
    745 			 * case is that we can fit everything into the
    746 			 * socket buffer.
    747 			 */
    748 			puffs_framev_output(pu, pfctrl, fio);
    749 		}
    750 
    751 		/*
    752 		 * Build list of which to enable/disable in writecheck.
    753 		 */
    754 		nchanges = 0;
    755 		LIST_FOREACH(fio, &pu->pu_ios, fio_entries) {
    756 			if (fio->stat & FIO_WRGONE)
    757 				continue;
    758 
    759 			/* en/disable write checks for kqueue as needed */
    760 			assert((FIO_EN_WRITE(fio) && FIO_RM_WRITE(fio)) == 0);
    761 			if (FIO_EN_WRITE(fio)) {
    762 				EV_SET(&pu->pu_evs[nchanges], fio->io_fd,
    763 				    EVFILT_WRITE, EV_ENABLE, 0, 0,
    764 				    (uintptr_t)fio);
    765 				fio->stat |= FIO_WR;
    766 				nchanges++;
    767 			}
    768 			if (FIO_RM_WRITE(fio)) {
    769 				EV_SET(&pu->pu_evs[nchanges], fio->io_fd,
    770 				    EVFILT_WRITE, EV_DISABLE, 0, 0,
    771 				    (uintptr_t)fio);
    772 				fio->stat &= ~FIO_WR;
    773 				nchanges++;
    774 			}
    775 			assert(nchanges <= pu->pu_nfds);
    776 		}
    777 
    778 		ndone = kevent(pu->pu_kq, pu->pu_evs, nchanges,
    779 		    pu->pu_evs, 2*pu->pu_nfds, pu->pu_ml_timep);
    780 
    781 		if (ndone == -1) {
    782 			if (errno != EINTR)
    783 				goto out;
    784 			else
    785 				continue;
    786 		}
    787 
    788 		/* uoptimize */
    789 		if (ndone == 0)
    790 			continue;
    791 
    792 		/* iterate over the results */
    793 		for (curev = pu->pu_evs; ndone--; curev++) {
    794 			int what;
    795 
    796 #if 0
    797 			/* get & possibly dispatch events from kernel */
    798 			if (curev->ident == puffsfd) {
    799 				if (puffs_req_handle(pgr, ppr, 0) == -1)
    800 					goto out;
    801 				continue;
    802 			}
    803 #endif
    804 
    805 			fio = (void *)curev->udata;
    806 			pfctrl = fio->fctrl;
    807 			if (curev->flags & EV_ERROR) {
    808 				assert(curev->filter == EVFILT_WRITE);
    809 				fio->stat &= ~FIO_WR;
    810 
    811 				/* XXX: how to know if it's a transient error */
    812 				puffs_framev_writeclose(pu, fio,
    813 				    (int)curev->data);
    814 				puffs_framev_notify(fio, PUFFS_FBIO_ERROR);
    815 				continue;
    816 			}
    817 
    818 			what = 0;
    819 			if (curev->filter == EVFILT_READ) {
    820 				puffs_framev_input(pu, pfctrl, fio);
    821 				what |= PUFFS_FBIO_READ;
    822 			}
    823 
    824 			else if (curev->filter == EVFILT_WRITE) {
    825 				puffs_framev_output(pu, pfctrl, fio);
    826 				what |= PUFFS_FBIO_WRITE;
    827 			}
    828 			if (what)
    829 				puffs_framev_notify(fio, what);
    830 		}
    831 
    832 		/*
    833 		 * Schedule continuations.
    834 		 */
    835 		while ((pcc = TAILQ_FIRST(&pu->pu_sched)) != NULL) {
    836 			TAILQ_REMOVE(&pu->pu_sched, pcc, entries);
    837 			puffs_goto(pcc);
    838 		}
    839 
    840 		/*
    841 		 * Really free fd's now that we don't have references
    842 		 * to them.
    843 		 */
    844 		while ((fio = LIST_FIRST(&pu->pu_ios_rmlist)) != NULL) {
    845 			LIST_REMOVE(fio, fio_entries);
    846 			free(fio);
    847 		}
    848 	}
    849 	finalpush(pu);
    850 	errno = 0;
    851 
    852  out:
    853 	/* store the real error for a while */
    854 	sverrno = errno;
    855 
    856 	errno = sverrno;
    857 	if (errno)
    858 		return -1;
    859 	else
    860 		return 0;
    861 }
    862