kernel - lwkt_token revamp
[dragonfly.git] / sys / vfs / fifofs / fifo_vnops.c
CommitLineData
984263bc
MD
1/*
2 * Copyright (c) 1990, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
984263bc 32 */
aac0aabd
MD
33/*
34 * Filesystem FIFO type ops. All entry points are MPSAFE. We primarily
35 * use v_token to interlock operations.
36 */
984263bc
MD
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/unistd.h>
40#include <sys/kernel.h>
41#include <sys/lock.h>
42#include <sys/malloc.h>
87de5057 43#include <sys/thread2.h>
984263bc
MD
44#include <sys/vnode.h>
45#include <sys/socket.h>
46#include <sys/socketvar.h>
47#include <sys/filio.h>
48#include <sys/fcntl.h>
49#include <sys/file.h>
50#include <sys/event.h>
51#include <sys/poll.h>
52#include <sys/un.h>
87de5057
MD
53
54#include <sys/thread2.h>
55
1f2de5d4 56#include "fifo.h"
984263bc
MD
57
58/*
59 * This structure is associated with the FIFO vnode and stores
60 * the state associated with the FIFO.
61 */
62struct fifoinfo {
63 struct socket *fi_readsock;
64 struct socket *fi_writesock;
65 long fi_readers;
66 long fi_writers;
67};
68
a6ee311a
RG
69static int fifo_badop (void);
70static int fifo_print (struct vop_print_args *);
e62afb5f 71static int fifo_lookup (struct vop_old_lookup_args *);
a6ee311a
RG
72static int fifo_open (struct vop_open_args *);
73static int fifo_close (struct vop_close_args *);
74static int fifo_read (struct vop_read_args *);
75static int fifo_write (struct vop_write_args *);
76static int fifo_ioctl (struct vop_ioctl_args *);
77static int fifo_poll (struct vop_poll_args *);
78static int fifo_kqfilter (struct vop_kqfilter_args *);
79static int fifo_inactive (struct vop_inactive_args *);
80static int fifo_bmap (struct vop_bmap_args *);
81static int fifo_pathconf (struct vop_pathconf_args *);
82static int fifo_advlock (struct vop_advlock_args *);
984263bc
MD
83
84static void filt_fifordetach(struct knote *kn);
85static int filt_fiforead(struct knote *kn, long hint);
86static void filt_fifowdetach(struct knote *kn);
87static int filt_fifowrite(struct knote *kn, long hint);
88
89static struct filterops fiforead_filtops =
90 { 1, NULL, filt_fifordetach, filt_fiforead };
91static struct filterops fifowrite_filtops =
92 { 1, NULL, filt_fifowdetach, filt_fifowrite };
93
66a1ddf5
MD
94struct vop_ops fifo_vnode_vops = {
95 .vop_default = vop_defaultop,
96 .vop_access = (void *)vop_ebadf,
97 .vop_advlock = fifo_advlock,
98 .vop_bmap = fifo_bmap,
99 .vop_close = fifo_close,
100 .vop_old_create = (void *)fifo_badop,
101 .vop_getattr = (void *)vop_ebadf,
102 .vop_inactive = fifo_inactive,
103 .vop_ioctl = fifo_ioctl,
104 .vop_kqfilter = fifo_kqfilter,
105 .vop_old_link = (void *)fifo_badop,
106 .vop_old_lookup = fifo_lookup,
107 .vop_old_mkdir = (void *)fifo_badop,
108 .vop_old_mknod = (void *)fifo_badop,
109 .vop_open = fifo_open,
110 .vop_pathconf = fifo_pathconf,
111 .vop_poll = fifo_poll,
112 .vop_print = fifo_print,
113 .vop_read = fifo_read,
114 .vop_readdir = (void *)fifo_badop,
115 .vop_readlink = (void *)fifo_badop,
116 .vop_reallocblks = (void *)fifo_badop,
117 .vop_reclaim = (void *)vop_null,
118 .vop_old_remove = (void *)fifo_badop,
119 .vop_old_rename = (void *)fifo_badop,
120 .vop_old_rmdir = (void *)fifo_badop,
121 .vop_setattr = (void *)vop_ebadf,
122 .vop_old_symlink = (void *)fifo_badop,
123 .vop_write = fifo_write
984263bc 124};
984263bc 125
66a1ddf5 126VNODEOP_SET(fifo_vnode_vops);
984263bc 127
5fd012e0
MD
128static MALLOC_DEFINE(M_FIFOINFO, "Fifo info", "Fifo info entries");
129
b5f12e21 130/*
31bd717a 131 * fifo_vnoperate()
b5f12e21 132 */
984263bc 133int
b5f12e21 134fifo_vnoperate(struct vop_generic_args *ap)
984263bc 135{
66a1ddf5 136 return (VOCALL(&fifo_vnode_vops, ap));
984263bc
MD
137}
138
139/*
140 * Trivial lookup routine that always fails.
b5f12e21
CP
141 *
142 * fifo_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
143 * struct componentname *a_cnp)
984263bc
MD
144 */
145/* ARGSUSED */
146static int
e62afb5f 147fifo_lookup(struct vop_old_lookup_args *ap)
984263bc 148{
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MD
149 *ap->a_vpp = NULL;
150 return (ENOTDIR);
151}
152
153/*
154 * Open called to set up a new instance of a fifo or
155 * to find an active instance of a fifo.
b5f12e21
CP
156 *
157 * fifo_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
b478fdce 158 * struct file *a_fp)
984263bc
MD
159 */
160/* ARGSUSED */
161static int
b5f12e21 162fifo_open(struct vop_open_args *ap)
984263bc 163{
87de5057 164 struct thread *td = curthread;
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MD
165 struct vnode *vp = ap->a_vp;
166 struct fifoinfo *fip;
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MD
167 struct socket *rso, *wso;
168 int error;
169
3b998fa9 170 lwkt_gettoken(&vp->v_token);
984263bc 171 if ((fip = vp->v_fifoinfo) == NULL) {
5fd012e0 172 MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_FIFOINFO, M_WAITOK);
984263bc 173 vp->v_fifoinfo = fip;
87de5057 174 error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, td);
984263bc 175 if (error) {
efda3bd0 176 kfree(fip, M_FIFOINFO);
984263bc 177 vp->v_fifoinfo = NULL;
aac0aabd 178 goto done;
984263bc
MD
179 }
180 fip->fi_readsock = rso;
87de5057 181 error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, td);
984263bc 182 if (error) {
9ba76b73 183 soclose(rso, FNONBLOCK);
efda3bd0 184 kfree(fip, M_FIFOINFO);
984263bc 185 vp->v_fifoinfo = NULL;
aac0aabd 186 goto done;
984263bc
MD
187 }
188 fip->fi_writesock = wso;
189 error = unp_connect2(wso, rso);
190 if (error) {
9ba76b73
MD
191 soclose(wso, FNONBLOCK);
192 soclose(rso, FNONBLOCK);
efda3bd0 193 kfree(fip, M_FIFOINFO);
984263bc 194 vp->v_fifoinfo = NULL;
aac0aabd 195 goto done;
984263bc
MD
196 }
197 fip->fi_readers = fip->fi_writers = 0;
6d49aa6f 198 wso->so_snd.ssb_lowat = PIPE_BUF;
984263bc
MD
199 rso->so_state |= SS_CANTRCVMORE;
200 }
201 if (ap->a_mode & FREAD) {
202 fip->fi_readers++;
203 if (fip->fi_readers == 1) {
204 fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
205 if (fip->fi_writers > 0) {
206 wakeup((caddr_t)&fip->fi_writers);
207 sowwakeup(fip->fi_writesock);
208 }
209 }
210 }
211 if (ap->a_mode & FWRITE) {
212 fip->fi_writers++;
213 if (fip->fi_writers == 1) {
214 fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
215 if (fip->fi_readers > 0) {
216 wakeup((caddr_t)&fip->fi_readers);
217 sorwakeup(fip->fi_writesock);
218 }
219 }
220 }
221 if ((ap->a_mode & FREAD) && (ap->a_mode & O_NONBLOCK) == 0) {
222 if (fip->fi_writers == 0) {
a11aaa81 223 vn_unlock(vp);
984263bc 224 error = tsleep((caddr_t)&fip->fi_readers,
377d4740 225 PCATCH, "fifoor", 0);
ca466bae 226 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
984263bc
MD
227 if (error)
228 goto bad;
229 /*
230 * We must have got woken up because we had a writer.
231 * That (and not still having one) is the condition
232 * that we must wait for.
233 */
234 }
235 }
236 if (ap->a_mode & FWRITE) {
237 if (ap->a_mode & O_NONBLOCK) {
238 if (fip->fi_readers == 0) {
239 error = ENXIO;
240 goto bad;
241 }
242 } else {
243 if (fip->fi_readers == 0) {
a11aaa81 244 vn_unlock(vp);
984263bc 245 error = tsleep((caddr_t)&fip->fi_writers,
377d4740 246 PCATCH, "fifoow", 0);
ca466bae 247 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
984263bc
MD
248 if (error)
249 goto bad;
250 /*
251 * We must have got woken up because we had
252 * a reader. That (and not still having one)
253 * is the condition that we must wait for.
254 */
255 }
256 }
257 }
2247fe02 258 vsetflags(vp, VNOTSEEKABLE);
aac0aabd 259 error = vop_stdopen(ap);
3b998fa9 260 lwkt_reltoken(&vp->v_token);
aac0aabd 261 return (error);
984263bc 262bad:
cbeb1f72 263 vop_stdopen(ap); /* bump opencount/writecount as appropriate */
87de5057 264 VOP_CLOSE(vp, ap->a_mode);
aac0aabd 265done:
3b998fa9 266 lwkt_reltoken(&vp->v_token);
984263bc
MD
267 return (error);
268}
269
270/*
271 * Vnode op for read
b5f12e21
CP
272 *
273 * fifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
274 * struct ucred *a_cred)
984263bc
MD
275 */
276/* ARGSUSED */
277static int
b5f12e21 278fifo_read(struct vop_read_args *ap)
984263bc
MD
279{
280 struct uio *uio = ap->a_uio;
3b998fa9
MD
281 struct vnode *vp = ap->a_vp;
282 struct socket *rso = vp->v_fifoinfo->fi_readsock;
984263bc 283 int error, startresid;
9ba76b73 284 int flags;
984263bc
MD
285
286#ifdef DIAGNOSTIC
287 if (uio->uio_rw != UIO_READ)
288 panic("fifo_read mode");
289#endif
290 if (uio->uio_resid == 0)
291 return (0);
292 if (ap->a_ioflag & IO_NDELAY)
9ba76b73
MD
293 flags = MSG_FNONBLOCKING;
294 else
295 flags = 0;
984263bc 296 startresid = uio->uio_resid;
3b998fa9
MD
297 vn_unlock(vp);
298 lwkt_gettoken(&vp->v_token);
d8a9a23b 299 error = soreceive(rso, NULL, uio, NULL, NULL, &flags);
3b998fa9
MD
300 lwkt_reltoken(&vp->v_token);
301 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
984263bc
MD
302 return (error);
303}
304
305/*
306 * Vnode op for write
b5f12e21
CP
307 *
308 * fifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
309 * struct ucred *a_cred)
984263bc
MD
310 */
311/* ARGSUSED */
312static int
b5f12e21 313fifo_write(struct vop_write_args *ap)
984263bc 314{
dadab5e9 315 struct thread *td = ap->a_uio->uio_td;
3b998fa9
MD
316 struct vnode *vp = ap->a_vp;
317 struct socket *wso = vp->v_fifoinfo->fi_writesock;
984263bc 318 int error;
9ba76b73 319 int flags;
984263bc
MD
320
321#ifdef DIAGNOSTIC
322 if (ap->a_uio->uio_rw != UIO_WRITE)
323 panic("fifo_write mode");
324#endif
325 if (ap->a_ioflag & IO_NDELAY)
9ba76b73
MD
326 flags = MSG_FNONBLOCKING;
327 else
328 flags = 0;
3b998fa9
MD
329 vn_unlock(vp);
330 lwkt_gettoken(&vp->v_token);
60233e58 331 error = sosend(wso, NULL, ap->a_uio, 0, NULL, flags, td);
3b998fa9
MD
332 lwkt_reltoken(&vp->v_token);
333 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
984263bc
MD
334 return (error);
335}
336
337/*
338 * Device ioctl operation.
b5f12e21
CP
339 *
340 * fifo_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, int a_fflag,
87baaf0c 341 * struct ucred *a_cred, struct sysmsg *a_sysmsg)
984263bc
MD
342 */
343/* ARGSUSED */
344static int
b5f12e21 345fifo_ioctl(struct vop_ioctl_args *ap)
984263bc 346{
9443ca22 347 struct file filetmp; /* Local */
3b998fa9 348 struct vnode *vp = ap->a_vp;
984263bc
MD
349 int error;
350
984263bc 351 if (ap->a_fflag & FREAD) {
3b998fa9
MD
352 filetmp.f_data = vp->v_fifoinfo->fi_readsock;
353 lwkt_gettoken(&vp->v_token);
87baaf0c
MD
354 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data,
355 ap->a_cred, ap->a_sysmsg);
3b998fa9 356 lwkt_reltoken(&vp->v_token);
984263bc
MD
357 if (error)
358 return (error);
359 }
360 if (ap->a_fflag & FWRITE) {
3b998fa9
MD
361 filetmp.f_data = vp->v_fifoinfo->fi_writesock;
362 lwkt_gettoken(&vp->v_token);
87baaf0c
MD
363 error = soo_ioctl(&filetmp, ap->a_command, ap->a_data,
364 ap->a_cred, ap->a_sysmsg);
3b998fa9 365 lwkt_reltoken(&vp->v_token);
984263bc
MD
366 if (error)
367 return (error);
368 }
369 return (0);
370}
371
b5f12e21
CP
372/*
373 * fifo_kqfilter(struct vnode *a_vp, struct knote *a_kn)
374 */
984263bc
MD
375/* ARGSUSED */
376static int
b5f12e21 377fifo_kqfilter(struct vop_kqfilter_args *ap)
984263bc 378{
aac0aabd
MD
379 struct vnode *vp = ap->a_vp;
380 struct fifoinfo *fi = vp->v_fifoinfo;
984263bc 381 struct socket *so;
6d49aa6f 382 struct signalsockbuf *ssb;
984263bc 383
3b998fa9 384 lwkt_gettoken(&vp->v_token);
b58e725b 385
984263bc
MD
386 switch (ap->a_kn->kn_filter) {
387 case EVFILT_READ:
388 ap->a_kn->kn_fop = &fiforead_filtops;
389 so = fi->fi_readsock;
6d49aa6f 390 ssb = &so->so_rcv;
984263bc
MD
391 break;
392 case EVFILT_WRITE:
393 ap->a_kn->kn_fop = &fifowrite_filtops;
394 so = fi->fi_writesock;
6d49aa6f 395 ssb = &so->so_snd;
984263bc
MD
396 break;
397 default:
3b998fa9 398 lwkt_reltoken(&vp->v_token);
984263bc
MD
399 return (1);
400 }
401
aac0aabd 402 ap->a_kn->kn_hook = (caddr_t)vp;
6d49aa6f 403 ssb_insert_knote(ssb, ap->a_kn);
984263bc 404
3b998fa9 405 lwkt_reltoken(&vp->v_token);
984263bc
MD
406 return (0);
407}
408
409static void
410filt_fifordetach(struct knote *kn)
411{
aac0aabd
MD
412 struct vnode *vp = (void *)kn->kn_hook;
413 struct socket *so = vp->v_fifoinfo->fi_readsock;
984263bc 414
3b998fa9 415 lwkt_gettoken(&vp->v_token);
6d49aa6f 416 ssb_remove_knote(&so->so_rcv, kn);
3b998fa9 417 lwkt_reltoken(&vp->v_token);
984263bc
MD
418}
419
420static int
421filt_fiforead(struct knote *kn, long hint)
422{
aac0aabd 423 struct vnode *vp = (void *)kn->kn_hook;
7a5447ef 424 struct socket *so = vp->v_fifoinfo->fi_readsock;
984263bc 425
3b998fa9 426 lwkt_gettoken(&vp->v_token);
6d49aa6f 427 kn->kn_data = so->so_rcv.ssb_cc;
984263bc
MD
428 if (so->so_state & SS_CANTRCVMORE) {
429 kn->kn_flags |= EV_EOF;
3b998fa9 430 lwkt_reltoken(&vp->v_token);
984263bc
MD
431 return (1);
432 }
433 kn->kn_flags &= ~EV_EOF;
3b998fa9 434 lwkt_reltoken(&vp->v_token);
984263bc
MD
435 return (kn->kn_data > 0);
436}
437
438static void
439filt_fifowdetach(struct knote *kn)
440{
aac0aabd
MD
441 struct vnode *vp = (void *)kn->kn_hook;
442 struct socket *so = vp->v_fifoinfo->fi_writesock;
984263bc 443
3b998fa9 444 lwkt_gettoken(&vp->v_token);
6d49aa6f 445 ssb_remove_knote(&so->so_snd, kn);
3b998fa9 446 lwkt_reltoken(&vp->v_token);
984263bc
MD
447}
448
449static int
450filt_fifowrite(struct knote *kn, long hint)
451{
aac0aabd
MD
452 struct vnode *vp = (void *)kn->kn_hook;
453 struct socket *so = vp->v_fifoinfo->fi_writesock;
984263bc 454
3b998fa9 455 lwkt_gettoken(&vp->v_token);
6d49aa6f 456 kn->kn_data = ssb_space(&so->so_snd);
984263bc
MD
457 if (so->so_state & SS_CANTSENDMORE) {
458 kn->kn_flags |= EV_EOF;
3b998fa9 459 lwkt_reltoken(&vp->v_token);
984263bc
MD
460 return (1);
461 }
462 kn->kn_flags &= ~EV_EOF;
3b998fa9 463 lwkt_reltoken(&vp->v_token);
6d49aa6f 464 return (kn->kn_data >= so->so_snd.ssb_lowat);
984263bc
MD
465}
466
b5f12e21 467/*
b478fdce 468 * fifo_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred)
b5f12e21 469 */
984263bc
MD
470/* ARGSUSED */
471static int
b5f12e21 472fifo_poll(struct vop_poll_args *ap)
984263bc 473{
3b998fa9 474 struct vnode *vp = ap->a_vp;
984263bc 475 struct file filetmp;
d08a3c4d
HP
476 int events, revents = 0;
477
3b998fa9 478 lwkt_gettoken(&vp->v_token);
630a348c 479 events = ap->a_events &
9443ca22 480 (POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM | POLLRDBAND);
d08a3c4d
HP
481 if (events) {
482 /*
9443ca22
HP
483 * If POLLIN or POLLRDNORM is requested and POLLINIGNEOF is
484 * not, then convert the first two to the last one. This
485 * tells the socket poll function to ignore EOF so that we
486 * block if there is no writer (and no data). Callers can
487 * set POLLINIGNEOF to get non-blocking behavior.
d08a3c4d 488 */
ad4bd3a5
HP
489 if (events & (POLLIN | POLLRDNORM) &&
490 !(events & POLLINIGNEOF)) {
d08a3c4d
HP
491 events &= ~(POLLIN | POLLRDNORM);
492 events |= POLLINIGNEOF;
493 }
9443ca22 494
3b998fa9 495 filetmp.f_data = vp->v_fifoinfo->fi_readsock;
984263bc 496 if (filetmp.f_data)
87de5057 497 revents |= soo_poll(&filetmp, events, ap->a_cred);
d08a3c4d 498
9443ca22
HP
499 /* Reverse the above conversion. */
500 if ((revents & POLLINIGNEOF) &&
501 !(ap->a_events & POLLINIGNEOF)) {
502 revents |= (ap->a_events & (POLLIN | POLLRDNORM));
d08a3c4d 503 revents &= ~POLLINIGNEOF;
d08a3c4d 504 }
984263bc 505 }
d08a3c4d
HP
506 events = ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND);
507 if (events) {
3b998fa9 508 filetmp.f_data = vp->v_fifoinfo->fi_writesock;
984263bc 509 if (filetmp.f_data)
87de5057 510 revents |= soo_poll(&filetmp, events, ap->a_cred);
984263bc 511 }
3b998fa9 512 lwkt_reltoken(&vp->v_token);
984263bc
MD
513 return (revents);
514}
515
b5f12e21 516/*
b478fdce 517 * fifo_inactive(struct vnode *a_vp)
b5f12e21 518 */
984263bc 519static int
b5f12e21 520fifo_inactive(struct vop_inactive_args *ap)
984263bc 521{
984263bc
MD
522 return (0);
523}
524
525/*
526 * This is a noop, simply returning what one has been given.
b5f12e21 527 *
08daea96 528 * fifo_bmap(struct vnode *a_vp, off_t a_loffset,
54078292 529 * off_t *a_doffsetp, int *a_runp, int *a_runb)
984263bc
MD
530 */
531static int
b5f12e21 532fifo_bmap(struct vop_bmap_args *ap)
984263bc 533{
54078292
MD
534 if (ap->a_doffsetp != NULL)
535 *ap->a_doffsetp = ap->a_loffset;
984263bc
MD
536 if (ap->a_runp != NULL)
537 *ap->a_runp = 0;
538 if (ap->a_runb != NULL)
539 *ap->a_runb = 0;
540 return (0);
541}
542
543/*
544 * Device close routine
b5f12e21 545 *
b478fdce 546 * fifo_close(struct vnode *a_vp, int a_fflag)
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547 */
548/* ARGSUSED */
549static int
b5f12e21 550fifo_close(struct vop_close_args *ap)
984263bc 551{
0e99e805 552 struct vnode *vp = ap->a_vp;
aac0aabd 553 struct fifoinfo *fip;
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554 int error1, error2;
555
3b998fa9 556 lwkt_gettoken(&vp->v_token);
aac0aabd 557 fip = vp->v_fifoinfo;
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558 if (ap->a_fflag & FREAD) {
559 fip->fi_readers--;
560 if (fip->fi_readers == 0)
561 socantsendmore(fip->fi_writesock);
562 }
563 if (ap->a_fflag & FWRITE) {
564 fip->fi_writers--;
565 if (fip->fi_writers == 0)
566 socantrcvmore(fip->fi_readsock);
567 }
3c37c940 568 if (vp->v_sysref.refcnt > 1) {
8ddc6004 569 vop_stdclose(ap);
3b998fa9 570 lwkt_reltoken(&vp->v_token);
984263bc 571 return (0);
8ddc6004 572 }
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573 error1 = soclose(fip->fi_readsock, FNONBLOCK);
574 error2 = soclose(fip->fi_writesock, FNONBLOCK);
5fd012e0 575 FREE(fip, M_FIFOINFO);
984263bc 576 vp->v_fifoinfo = NULL;
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577 if (error1) {
578 error2 = error1;
579 } else {
580 vop_stdclose(ap);
581 }
3b998fa9 582 lwkt_reltoken(&vp->v_token);
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583 return (error2);
584}
585
586
587/*
588 * Print out internal contents of a fifo vnode.
589 */
590int
b5f12e21 591fifo_printinfo(struct vnode *vp)
984263bc 592{
0e99e805 593 struct fifoinfo *fip = vp->v_fifoinfo;
984263bc 594
086c1d7e 595 kprintf(", fifo with %ld readers and %ld writers",
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596 fip->fi_readers, fip->fi_writers);
597 return (0);
598}
599
600/*
601 * Print out the contents of a fifo vnode.
b5f12e21
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602 *
603 * fifo_print(struct vnode *a_vp)
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604 */
605static int
b5f12e21 606fifo_print(struct vop_print_args *ap)
984263bc 607{
086c1d7e 608 kprintf("tag VT_NON");
984263bc 609 fifo_printinfo(ap->a_vp);
086c1d7e 610 kprintf("\n");
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611 return (0);
612}
613
614/*
615 * Return POSIX pathconf information applicable to fifo's.
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CP
616 *
617 * fifo_pathconf(struct vnode *a_vp, int a_name, int *a_retval)
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618 */
619int
b5f12e21 620fifo_pathconf(struct vop_pathconf_args *ap)
984263bc 621{
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622 switch (ap->a_name) {
623 case _PC_LINK_MAX:
624 *ap->a_retval = LINK_MAX;
625 return (0);
626 case _PC_PIPE_BUF:
627 *ap->a_retval = PIPE_BUF;
628 return (0);
629 case _PC_CHOWN_RESTRICTED:
630 *ap->a_retval = 1;
631 return (0);
632 default:
633 return (EINVAL);
634 }
635 /* NOTREACHED */
636}
637
638/*
639 * Fifo advisory byte-level locks.
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CP
640 *
641 * fifo_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl,
642 * int a_flags)
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643 */
644/* ARGSUSED */
645static int
b5f12e21 646fifo_advlock(struct vop_advlock_args *ap)
984263bc 647{
71c18fe3 648 return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP);
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649}
650
651/*
652 * Fifo bad operation
653 */
654static int
b5f12e21 655fifo_badop(void)
984263bc 656{
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657 panic("fifo_badop called");
658 /* NOTREACHED */
659}