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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * 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. | |
32 | * | |
33 | * @(#)fifo_vnops.c 7.7 (Berkeley) 4/15/91 | |
34 | * | |
35 | * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE | |
36 | * -------------------- ----- ---------------------- | |
37 | * CURRENT PATCH LEVEL: 1 00141 | |
38 | * -------------------- ----- ---------------------- | |
39 | * | |
40 | * 20 Apr 93 Jay Fenlason 1. fi_{readers|fi_writers} of fifoinfo init to 0 | |
41 | * 2. fifo_open() was calling tsleep() without | |
42 | * unlocking the inode of the fifo | |
43 | */ | |
44 | ||
45 | #include "param.h" | |
46 | #include "time.h" | |
47 | #include "namei.h" | |
48 | #include "vnode.h" | |
49 | #include "socket.h" | |
50 | #include "socketvar.h" | |
51 | #include "stat.h" | |
52 | #include "systm.h" | |
53 | #include "ioctl.h" | |
54 | #include "file.h" | |
55 | #include "fifo.h" | |
56 | #include "errno.h" | |
57 | #include "malloc.h" | |
58 | ||
59 | /* | |
60 | * This structure is associated with the FIFO vnode and stores | |
61 | * the state associated with the FIFO. | |
62 | */ | |
63 | struct fifoinfo { | |
64 | struct socket *fi_readsock; | |
65 | struct socket *fi_writesock; | |
66 | long fi_readers; | |
67 | long fi_writers; | |
68 | }; | |
69 | ||
70 | struct vnodeops fifo_vnodeops = { | |
71 | fifo_lookup, /* lookup */ | |
72 | fifo_create, /* create */ | |
73 | fifo_mknod, /* mknod */ | |
74 | fifo_open, /* open */ | |
75 | fifo_close, /* close */ | |
76 | fifo_access, /* access */ | |
77 | fifo_getattr, /* getattr */ | |
78 | fifo_setattr, /* setattr */ | |
79 | fifo_read, /* read */ | |
80 | fifo_write, /* write */ | |
81 | fifo_ioctl, /* ioctl */ | |
82 | fifo_select, /* select */ | |
83 | fifo_mmap, /* mmap */ | |
84 | fifo_fsync, /* fsync */ | |
85 | fifo_seek, /* seek */ | |
86 | fifo_remove, /* remove */ | |
87 | fifo_link, /* link */ | |
88 | fifo_rename, /* rename */ | |
89 | fifo_mkdir, /* mkdir */ | |
90 | fifo_rmdir, /* rmdir */ | |
91 | fifo_symlink, /* symlink */ | |
92 | fifo_readdir, /* readdir */ | |
93 | fifo_readlink, /* readlink */ | |
94 | fifo_abortop, /* abortop */ | |
95 | fifo_inactive, /* inactive */ | |
96 | fifo_reclaim, /* reclaim */ | |
97 | fifo_lock, /* lock */ | |
98 | fifo_unlock, /* unlock */ | |
99 | fifo_bmap, /* bmap */ | |
100 | fifo_strategy, /* strategy */ | |
101 | fifo_print, /* print */ | |
102 | fifo_islocked, /* islocked */ | |
103 | fifo_advlock, /* advlock */ | |
104 | }; | |
105 | ||
106 | /* | |
107 | * Trivial lookup routine that always fails. | |
108 | */ | |
109 | /* ARGSUSED */ | |
110 | fifo_lookup(vp, ndp, p) | |
111 | struct vnode *vp; | |
112 | struct nameidata *ndp; | |
113 | struct proc *p; | |
114 | { | |
115 | ||
116 | ndp->ni_dvp = vp; | |
117 | ndp->ni_vp = NULL; | |
118 | return (ENOTDIR); | |
119 | } | |
120 | ||
121 | /* | |
122 | * Open called to set up a new instance of a fifo or | |
123 | * to find an active instance of a fifo. | |
124 | */ | |
125 | /* ARGSUSED */ | |
126 | fifo_open(vp, mode, cred, p) | |
127 | register struct vnode *vp; | |
128 | int mode; | |
129 | struct ucred *cred; | |
130 | struct proc *p; | |
131 | { | |
132 | register struct fifoinfo *fip; | |
133 | struct socket *rso, *wso; | |
134 | int error; | |
135 | static char openstr[] = "fifo"; | |
136 | ||
137 | if ((mode & (FREAD|FWRITE)) == (FREAD|FWRITE)) | |
138 | return (EINVAL); | |
139 | if ((fip = vp->v_fifoinfo) == NULL) { | |
140 | MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK); | |
141 | vp->v_fifoinfo = fip; | |
142 | fip->fi_readers = fip->fi_writers = 0; | |
143 | if (error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) { | |
144 | free(fip, M_VNODE); | |
145 | vp->v_fifoinfo = NULL; | |
146 | return (error); | |
147 | } | |
148 | fip->fi_readsock = rso; | |
149 | if (error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) { | |
150 | (void)soclose(rso); | |
151 | free(fip, M_VNODE); | |
152 | vp->v_fifoinfo = NULL; | |
153 | return (error); | |
154 | } | |
155 | fip->fi_writesock = wso; | |
156 | if (error = unp_connect2(wso, rso)) { | |
157 | (void)soclose(wso); | |
158 | (void)soclose(rso); | |
159 | free(fip, M_VNODE); | |
160 | vp->v_fifoinfo = NULL; | |
161 | return (error); | |
162 | } | |
163 | wso->so_state |= SS_CANTRCVMORE; | |
164 | rso->so_state |= SS_CANTSENDMORE; | |
165 | } | |
166 | error = 0; | |
167 | if (mode & FREAD) { | |
168 | fip->fi_readers++; | |
169 | if (fip->fi_readers == 1) { | |
170 | fip->fi_writesock->so_state &= ~SS_CANTSENDMORE; | |
171 | if (fip->fi_writers > 0) | |
172 | wakeup((caddr_t)&fip->fi_writers); | |
173 | } | |
174 | if (mode & O_NONBLOCK) | |
175 | return (0); | |
176 | while (fip->fi_writers == 0) { | |
177 | VOP_UNLOCK(vp); | |
178 | error = tsleep((caddr_t)&fip->fi_readers, PSOCK | PCATCH, | |
179 | openstr, 0); | |
180 | VOP_LOCK(vp); | |
181 | if (error) | |
182 | break; | |
183 | } | |
184 | } else { | |
185 | fip->fi_writers++; | |
186 | if (fip->fi_readers == 0 && (mode & O_NONBLOCK)) { | |
187 | error = ENXIO; | |
188 | } else { | |
189 | if (fip->fi_writers == 1) { | |
190 | fip->fi_readsock->so_state &= ~SS_CANTRCVMORE; | |
191 | if (fip->fi_readers > 0) | |
192 | wakeup((caddr_t)&fip->fi_readers); | |
193 | } | |
194 | while (fip->fi_readers == 0) { | |
195 | VOP_UNLOCK(vp); | |
196 | error = tsleep((caddr_t)&fip->fi_writers, | |
197 | PSOCK | PCATCH, openstr, 0); | |
198 | VOP_LOCK(vp); | |
199 | if (error) | |
200 | break; | |
201 | } | |
202 | } | |
203 | } | |
204 | if (error) | |
205 | fifo_close(vp, mode, cred, p); | |
206 | return (error); | |
207 | } | |
208 | ||
209 | /* | |
210 | * Vnode op for read | |
211 | */ | |
212 | /* ARGSUSED */ | |
213 | fifo_read(vp, uio, ioflag, cred) | |
214 | struct vnode *vp; | |
215 | register struct uio *uio; | |
216 | int ioflag; | |
217 | struct ucred *cred; | |
218 | { | |
219 | register struct socket *rso = vp->v_fifoinfo->fi_readsock; | |
220 | int error, startresid; | |
221 | ||
222 | #ifdef DIAGNOSTIC | |
223 | if (uio->uio_rw != UIO_READ) | |
224 | panic("fifo_read mode"); | |
225 | #endif | |
226 | if (uio->uio_resid == 0) | |
227 | return (0); | |
228 | if (ioflag & IO_NDELAY) | |
229 | rso->so_state |= SS_NBIO; | |
230 | startresid = uio->uio_resid; | |
231 | VOP_UNLOCK(vp); | |
232 | error = soreceive(rso, (struct mbuf **)0, uio, (int *)0, | |
233 | (struct mbuf **)0, (struct mbuf **)0); | |
234 | VOP_LOCK(vp); | |
235 | /* | |
236 | * Clear EOF indication after first such return. | |
237 | */ | |
238 | if (uio->uio_resid == startresid) | |
239 | rso->so_state &= ~SS_CANTRCVMORE; | |
240 | if (ioflag & IO_NDELAY) | |
241 | rso->so_state &= ~SS_NBIO; | |
242 | return (error); | |
243 | } | |
244 | ||
245 | /* | |
246 | * Vnode op for write | |
247 | */ | |
248 | /* ARGSUSED */ | |
249 | fifo_write(vp, uio, ioflag, cred) | |
250 | struct vnode *vp; | |
251 | register struct uio *uio; | |
252 | int ioflag; | |
253 | struct ucred *cred; | |
254 | { | |
255 | struct socket *wso = vp->v_fifoinfo->fi_writesock; | |
256 | int error; | |
257 | ||
258 | #ifdef DIAGNOSTIC | |
259 | if (uio->uio_rw != UIO_WRITE) | |
260 | panic("fifo_write mode"); | |
261 | #endif | |
262 | if (ioflag & IO_NDELAY) | |
263 | wso->so_state |= SS_NBIO; | |
264 | VOP_UNLOCK(vp); | |
265 | error = sosend(wso, (struct mbuf *)0, uio, 0, (struct mbuf *)0); | |
266 | VOP_LOCK(vp); | |
267 | if (ioflag & IO_NDELAY) | |
268 | wso->so_state &= ~SS_NBIO; | |
269 | return (error); | |
270 | } | |
271 | ||
272 | /* | |
273 | * Device ioctl operation. | |
274 | */ | |
275 | /* ARGSUSED */ | |
276 | fifo_ioctl(vp, com, data, fflag, cred, p) | |
277 | struct vnode *vp; | |
278 | int com; | |
279 | caddr_t data; | |
280 | int fflag; | |
281 | struct ucred *cred; | |
282 | struct proc *p; | |
283 | { | |
284 | struct file filetmp; | |
285 | int error; | |
286 | ||
287 | if (com == FIONBIO) | |
288 | return (0); | |
289 | if (fflag & FREAD) | |
290 | filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock; | |
291 | else | |
292 | filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock; | |
293 | return (soo_ioctl(&filetmp, com, data, p)); | |
294 | } | |
295 | ||
296 | /* ARGSUSED */ | |
297 | fifo_select(vp, which, fflag, cred, p) | |
298 | struct vnode *vp; | |
299 | int which, fflag; | |
300 | struct ucred *cred; | |
301 | struct proc *p; | |
302 | { | |
303 | struct file filetmp; | |
304 | int error; | |
305 | ||
306 | if (fflag & FREAD) | |
307 | filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_readsock; | |
308 | else | |
309 | filetmp.f_data = (caddr_t)vp->v_fifoinfo->fi_writesock; | |
310 | return (soo_select(&filetmp, which, p)); | |
311 | } | |
312 | ||
313 | /* | |
314 | * This is a noop, simply returning what one has been given. | |
315 | */ | |
316 | fifo_bmap(vp, bn, vpp, bnp) | |
317 | struct vnode *vp; | |
318 | daddr_t bn; | |
319 | struct vnode **vpp; | |
320 | daddr_t *bnp; | |
321 | { | |
322 | ||
323 | if (vpp != NULL) | |
324 | *vpp = vp; | |
325 | if (bnp != NULL) | |
326 | *bnp = bn; | |
327 | return (0); | |
328 | } | |
329 | ||
330 | /* | |
331 | * At the moment we do not do any locking. | |
332 | */ | |
333 | /* ARGSUSED */ | |
334 | fifo_lock(vp) | |
335 | struct vnode *vp; | |
336 | { | |
337 | ||
338 | return (0); | |
339 | } | |
340 | ||
341 | /* ARGSUSED */ | |
342 | fifo_unlock(vp) | |
343 | struct vnode *vp; | |
344 | { | |
345 | ||
346 | return (0); | |
347 | } | |
348 | ||
349 | /* | |
350 | * Device close routine | |
351 | */ | |
352 | /* ARGSUSED */ | |
353 | fifo_close(vp, fflag, cred, p) | |
354 | register struct vnode *vp; | |
355 | int fflag; | |
356 | struct ucred *cred; | |
357 | struct proc *p; | |
358 | { | |
359 | register struct fifoinfo *fip = vp->v_fifoinfo; | |
360 | int error1, error2; | |
361 | ||
362 | if (fflag & FWRITE) { | |
363 | fip->fi_writers--; | |
364 | if (fip->fi_writers == 0) | |
365 | socantrcvmore(fip->fi_readsock); | |
366 | } else { | |
367 | fip->fi_readers--; | |
368 | if (fip->fi_readers == 0) | |
369 | socantsendmore(fip->fi_writesock); | |
370 | } | |
371 | if (vp->v_usecount > 1) | |
372 | return (0); | |
373 | error1 = soclose(fip->fi_readsock); | |
374 | error2 = soclose(fip->fi_writesock); | |
375 | FREE(fip, M_VNODE); | |
376 | vp->v_fifoinfo = NULL; | |
377 | if (error1) | |
378 | return (error1); | |
379 | return (error2); | |
380 | } | |
381 | ||
382 | /* | |
383 | * Print out the contents of a fifo vnode. | |
384 | */ | |
385 | fifo_print(vp) | |
386 | struct vnode *vp; | |
387 | { | |
388 | ||
389 | printf("tag VT_NON"); | |
390 | fifo_printinfo(vp); | |
391 | printf("\n"); | |
392 | } | |
393 | ||
394 | /* | |
395 | * Print out internal contents of a fifo vnode. | |
396 | */ | |
397 | fifo_printinfo(vp) | |
398 | struct vnode *vp; | |
399 | { | |
400 | register struct fifoinfo *fip = vp->v_fifoinfo; | |
401 | ||
402 | printf(", fifo with %d readers and %d writers", | |
403 | fip->fi_readers, fip->fi_writers); | |
404 | } | |
405 | ||
406 | /* | |
407 | * Fifo failed operation | |
408 | */ | |
409 | fifo_ebadf() | |
410 | { | |
411 | ||
412 | return (EBADF); | |
413 | } | |
414 | ||
415 | /* | |
416 | * Fifo advisory byte-level locks. | |
417 | */ | |
418 | /* ARGSUSED */ | |
419 | fifo_advlock(vp, id, op, fl, flags) | |
420 | struct vnode *vp; | |
421 | caddr_t id; | |
422 | int op; | |
423 | struct flock *fl; | |
424 | int flags; | |
425 | { | |
426 | ||
427 | return (EOPNOTSUPP); | |
428 | } | |
429 | ||
430 | /* | |
431 | * Fifo bad operation | |
432 | */ | |
433 | fifo_badop() | |
434 | { | |
435 | ||
436 | panic("fifo_badop called"); | |
437 | /* NOTREACHED */ | |
438 | } |