__P()!=wanted, clean up the vm subsystem
[dragonfly.git] / sys / vfs / fdesc / fdesc_vnops.c
CommitLineData
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1/*
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)fdesc_vnops.c 8.9 (Berkeley) 1/21/94
37 *
38 * $FreeBSD: src/sys/miscfs/fdesc/fdesc_vnops.c,v 1.47.2.1 2001/10/22 22:49:26 chris Exp $
1f2de5d4 39 * $DragonFly: src/sys/vfs/fdesc/fdesc_vnops.c,v 1.6 2003/08/07 21:17:40 dillon Exp $
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40 */
41
42/*
43 * /dev/fd Filesystem
44 */
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/conf.h>
49#include <sys/dirent.h>
50#include <sys/filedesc.h>
51#include <sys/kernel.h> /* boottime */
52#include <sys/lock.h>
53#include <sys/malloc.h>
54#include <sys/file.h> /* Must come after sys/malloc.h */
55#include <sys/mount.h>
984263bc 56#include <sys/proc.h>
dadab5e9 57#include <sys/namei.h>
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58#include <sys/socket.h>
59#include <sys/stat.h>
60#include <sys/vnode.h>
dadab5e9 61#include <sys/file2.h>
984263bc 62
1f2de5d4 63#include "fdesc.h"
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64
65#define FDL_WANT 0x01
66#define FDL_LOCKED 0x02
67static int fdcache_lock;
68
69static vop_t **fdesc_vnodeop_p;
70
71#define NFDCACHE 4
72#define FD_NHASH(ix) \
73 (&fdhashtbl[(ix) & fdhash])
74static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
75static u_long fdhash;
76
77static int fdesc_getattr __P((struct vop_getattr_args *ap));
78static int fdesc_inactive __P((struct vop_inactive_args *ap));
79static int fdesc_lookup __P((struct vop_lookup_args *ap));
80static int fdesc_open __P((struct vop_open_args *ap));
81static int fdesc_print __P((struct vop_print_args *ap));
82static int fdesc_readdir __P((struct vop_readdir_args *ap));
83static int fdesc_reclaim __P((struct vop_reclaim_args *ap));
84static int fdesc_poll __P((struct vop_poll_args *ap));
85static int fdesc_setattr __P((struct vop_setattr_args *ap));
86
87/*
88 * Initialise cache headers
89 */
90int
91fdesc_init(vfsp)
92 struct vfsconf *vfsp;
93{
94
95 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
96 return (0);
97}
98
99int
dadab5e9 100fdesc_allocvp(ftype, ix, mp, vpp, td)
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101 fdntype ftype;
102 int ix;
103 struct mount *mp;
104 struct vnode **vpp;
dadab5e9 105 struct thread *td;
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106{
107 struct fdhashhead *fc;
108 struct fdescnode *fd;
109 int error = 0;
110
111 fc = FD_NHASH(ix);
112loop:
113 LIST_FOREACH(fd, fc, fd_hash) {
114 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
dadab5e9 115 if (vget(fd->fd_vnode, 0, td))
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116 goto loop;
117 *vpp = fd->fd_vnode;
118 return (error);
119 }
120 }
121
122 /*
123 * otherwise lock the array while we call getnewvnode
124 * since that can block.
125 */
126 if (fdcache_lock & FDL_LOCKED) {
127 fdcache_lock |= FDL_WANT;
377d4740 128 (void) tsleep((caddr_t) &fdcache_lock, 0, "fdalvp", 0);
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129 goto loop;
130 }
131 fdcache_lock |= FDL_LOCKED;
132
133 /*
134 * Do the MALLOC before the getnewvnode since doing so afterward
135 * might cause a bogus v_data pointer to get dereferenced
136 * elsewhere if MALLOC should block.
137 */
138 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
139
140 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
141 if (error) {
142 FREE(fd, M_TEMP);
143 goto out;
144 }
145 (*vpp)->v_data = fd;
146 fd->fd_vnode = *vpp;
147 fd->fd_type = ftype;
148 fd->fd_fd = -1;
149 fd->fd_ix = ix;
150 LIST_INSERT_HEAD(fc, fd, fd_hash);
151
152out:
153 fdcache_lock &= ~FDL_LOCKED;
154
155 if (fdcache_lock & FDL_WANT) {
156 fdcache_lock &= ~FDL_WANT;
157 wakeup((caddr_t) &fdcache_lock);
158 }
159
160 return (error);
161}
162
163/*
164 * vp is the current namei directory
165 * ndp is the name to locate in that directory...
166 */
167static int
168fdesc_lookup(ap)
169 struct vop_lookup_args /* {
170 struct vnode * a_dvp;
171 struct vnode ** a_vpp;
172 struct componentname * a_cnp;
173 } */ *ap;
174{
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175 struct componentname *cnp = ap->a_cnp;
176 struct thread *td = cnp->cn_td;
177 struct proc *p = td->td_proc;
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178 struct vnode **vpp = ap->a_vpp;
179 struct vnode *dvp = ap->a_dvp;
984263bc 180 char *pname = cnp->cn_nameptr;
984263bc 181 int nlen = cnp->cn_namelen;
dadab5e9 182 int nfiles;
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183 u_int fd;
184 int error;
185 struct vnode *fvp;
186
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187 KKASSERT(p);
188 nfiles = p->p_fd->fd_nfiles;
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189 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) {
190 error = EROFS;
191 goto bad;
192 }
193
dadab5e9 194 VOP_UNLOCK(dvp, 0, td);
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195 if (cnp->cn_namelen == 1 && *pname == '.') {
196 *vpp = dvp;
197 VREF(dvp);
dadab5e9 198 vn_lock(dvp, LK_SHARED | LK_RETRY, td);
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199 return (0);
200 }
201
202 if (VTOFDESC(dvp)->fd_type != Froot) {
203 error = ENOTDIR;
204 goto bad;
205 }
206
207 fd = 0;
208 /* the only time a leading 0 is acceptable is if it's "0" */
209 if (*pname == '0' && nlen != 1) {
210 error = ENOENT;
211 goto bad;
212 }
213 while (nlen--) {
214 if (*pname < '0' || *pname > '9') {
215 error = ENOENT;
216 goto bad;
217 }
218 fd = 10 * fd + *pname++ - '0';
219 }
220
221 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
222 error = EBADF;
223 goto bad;
224 }
225
dadab5e9 226 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, td);
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227 if (error)
228 goto bad;
229 VTOFDESC(fvp)->fd_fd = fd;
dadab5e9 230 vn_lock(fvp, LK_SHARED | LK_RETRY, td);
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231 *vpp = fvp;
232 return (0);
233
234bad:
dadab5e9 235 vn_lock(dvp, LK_SHARED | LK_RETRY, td);
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236 *vpp = NULL;
237 return (error);
238}
239
240static int
241fdesc_open(ap)
242 struct vop_open_args /* {
243 struct vnode *a_vp;
244 int a_mode;
245 struct ucred *a_cred;
dadab5e9 246 struct thread *a_td;
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247 } */ *ap;
248{
249 struct vnode *vp = ap->a_vp;
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250 struct proc *p = ap->a_td->td_proc;
251
252 KKASSERT(p);
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253
254 if (VTOFDESC(vp)->fd_type == Froot)
255 return (0);
256
257 /*
258 * XXX Kludge: set p->p_dupfd to contain the value of the the file
259 * descriptor being sought for duplication. The error return ensures
260 * that the vnode for this device will be released by vn_open. Open
261 * will detect this special error and take the actions in dupfdopen.
262 * Other callers of vn_open or VOP_OPEN will simply report the
263 * error.
264 */
dadab5e9 265 p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
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266 return (ENODEV);
267}
268
269static int
270fdesc_getattr(ap)
271 struct vop_getattr_args /* {
272 struct vnode *a_vp;
273 struct vattr *a_vap;
274 struct ucred *a_cred;
dadab5e9 275 struct thread *a_td;
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276 } */ *ap;
277{
dadab5e9 278 struct proc *p = ap->a_td->td_proc;
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279 struct vnode *vp = ap->a_vp;
280 struct vattr *vap = ap->a_vap;
dadab5e9 281 struct filedesc *fdp;
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282 struct file *fp;
283 struct stat stb;
284 u_int fd;
285 int error = 0;
286
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287 KKASSERT(p);
288 fdp = p->p_fd;
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289 switch (VTOFDESC(vp)->fd_type) {
290 case Froot:
291 VATTR_NULL(vap);
292
293 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
294 vap->va_type = VDIR;
295 vap->va_nlink = 2;
296 vap->va_size = DEV_BSIZE;
297 vap->va_fileid = VTOFDESC(vp)->fd_ix;
298 vap->va_uid = 0;
299 vap->va_gid = 0;
300 vap->va_blocksize = DEV_BSIZE;
301 vap->va_atime.tv_sec = boottime.tv_sec;
302 vap->va_atime.tv_nsec = 0;
303 vap->va_mtime = vap->va_atime;
304 vap->va_ctime = vap->va_mtime;
305 vap->va_gen = 0;
306 vap->va_flags = 0;
307 vap->va_rdev = 0;
308 vap->va_bytes = 0;
309 break;
310
311 case Fdesc:
312 fd = VTOFDESC(vp)->fd_fd;
313
314 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL)
315 return (EBADF);
316
317 bzero(&stb, sizeof(stb));
dadab5e9 318 error = fo_stat(fp, &stb, ap->a_td);
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319 if (error == 0) {
320 VATTR_NULL(vap);
321 vap->va_type = IFTOVT(stb.st_mode);
322 vap->va_mode = stb.st_mode;
323#define FDRX (VREAD|VEXEC)
324 if (vap->va_type == VDIR)
325 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
326#undef FDRX
327 vap->va_nlink = 1;
328 vap->va_flags = 0;
329 vap->va_bytes = stb.st_blocks * stb.st_blksize;
330 vap->va_fileid = VTOFDESC(vp)->fd_ix;
331 vap->va_size = stb.st_size;
332 vap->va_blocksize = stb.st_blksize;
333 vap->va_rdev = stb.st_rdev;
334
335 /*
336 * If no time data is provided, use the current time.
337 */
338 if (stb.st_atimespec.tv_sec == 0 &&
339 stb.st_atimespec.tv_nsec == 0)
340 nanotime(&stb.st_atimespec);
341
342 if (stb.st_ctimespec.tv_sec == 0 &&
343 stb.st_ctimespec.tv_nsec == 0)
344 nanotime(&stb.st_ctimespec);
345
346 if (stb.st_mtimespec.tv_sec == 0 &&
347 stb.st_mtimespec.tv_nsec == 0)
348 nanotime(&stb.st_mtimespec);
349
350 vap->va_atime = stb.st_atimespec;
351 vap->va_mtime = stb.st_mtimespec;
352 vap->va_ctime = stb.st_ctimespec;
353 vap->va_uid = stb.st_uid;
354 vap->va_gid = stb.st_gid;
355 }
356 break;
357
358 default:
359 panic("fdesc_getattr");
360 break;
361 }
362
363 if (error == 0)
364 vp->v_type = vap->va_type;
365 return (error);
366}
367
368static int
369fdesc_setattr(ap)
370 struct vop_setattr_args /* {
371 struct vnode *a_vp;
372 struct vattr *a_vap;
373 struct ucred *a_cred;
dadab5e9 374 struct thread *a_td;
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375 } */ *ap;
376{
dadab5e9 377 struct proc *p = ap->a_td->td_proc;
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378 struct vattr *vap = ap->a_vap;
379 struct file *fp;
380 unsigned fd;
381 int error;
382
383 /*
384 * Can't mess with the root vnode
385 */
386 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
387 return (EACCES);
388
389 fd = VTOFDESC(ap->a_vp)->fd_fd;
dadab5e9 390 KKASSERT(p);
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391
392 /*
393 * Allow setattr where there is an underlying vnode.
394 */
dadab5e9 395 error = getvnode(p->p_fd, fd, &fp);
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396 if (error) {
397 /*
398 * getvnode() returns EINVAL if the file descriptor is not
399 * backed by a vnode. Silently drop all changes except
400 * chflags(2) in this case.
401 */
402 if (error == EINVAL) {
403 if (vap->va_flags != VNOVAL)
404 error = EOPNOTSUPP;
405 else
406 error = 0;
407 }
408 return (error);
409 }
410 return (error);
411}
412
413#define UIO_MX 16
414
415static int
416fdesc_readdir(ap)
417 struct vop_readdir_args /* {
418 struct vnode *a_vp;
419 struct uio *a_uio;
420 struct ucred *a_cred;
421 int *a_eofflag;
422 u_long *a_cookies;
423 int a_ncookies;
424 } */ *ap;
425{
426 struct uio *uio = ap->a_uio;
427 struct filedesc *fdp;
428 struct dirent d;
429 struct dirent *dp = &d;
430 int error, i, off, fcnt;
431
432 /*
433 * We don't allow exporting fdesc mounts, and currently local
434 * requests do not need cookies.
435 */
436 if (ap->a_ncookies)
437 panic("fdesc_readdir: not hungry");
438
439 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
440 panic("fdesc_readdir: not dir");
441
442 off = (int)uio->uio_offset;
443 if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
444 uio->uio_resid < UIO_MX)
445 return (EINVAL);
446 i = (u_int)off / UIO_MX;
dadab5e9
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447 KKASSERT(uio->uio_td->td_proc);
448 fdp = uio->uio_td->td_proc->p_fd;
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449 error = 0;
450
451 fcnt = i - 2; /* The first two nodes are `.' and `..' */
452
453 while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
454 switch (i) {
455 case 0: /* `.' */
456 case 1: /* `..' */
457 bzero((caddr_t)dp, UIO_MX);
458
459 dp->d_fileno = i + FD_ROOT;
460 dp->d_namlen = i + 1;
461 dp->d_reclen = UIO_MX;
462 bcopy("..", dp->d_name, dp->d_namlen);
463 dp->d_name[i + 1] = '\0';
464 dp->d_type = DT_DIR;
465 break;
466 default:
467 if (fdp->fd_ofiles[fcnt] == NULL)
468 goto done;
469
470 bzero((caddr_t) dp, UIO_MX);
471 dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
472 dp->d_reclen = UIO_MX;
473 dp->d_type = DT_UNKNOWN;
474 dp->d_fileno = i + FD_DESC;
475 break;
476 }
477 /*
478 * And ship to userland
479 */
480 error = uiomove((caddr_t) dp, UIO_MX, uio);
481 if (error)
482 break;
483 i++;
484 fcnt++;
485 }
486
487done:
488 uio->uio_offset = i * UIO_MX;
489 return (error);
490}
491
492static int
493fdesc_poll(ap)
494 struct vop_poll_args /* {
495 struct vnode *a_vp;
496 int a_events;
497 struct ucred *a_cred;
dadab5e9 498 struct thread *a_td;
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499 } */ *ap;
500{
dadab5e9 501 return seltrue(0, ap->a_events, ap->a_td);
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502}
503
504static int
505fdesc_inactive(ap)
506 struct vop_inactive_args /* {
507 struct vnode *a_vp;
dadab5e9 508 struct thread *a_td;
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509 } */ *ap;
510{
511 struct vnode *vp = ap->a_vp;
512
513 /*
514 * Clear out the v_type field to avoid
515 * nasty things happening in vgone().
516 */
dadab5e9 517 VOP_UNLOCK(vp, 0, ap->a_td);
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518 vp->v_type = VNON;
519 return (0);
520}
521
522static int
523fdesc_reclaim(ap)
524 struct vop_reclaim_args /* {
525 struct vnode *a_vp;
526 } */ *ap;
527{
528 struct vnode *vp = ap->a_vp;
529 struct fdescnode *fd = VTOFDESC(vp);
530
531 LIST_REMOVE(fd, fd_hash);
532 FREE(vp->v_data, M_TEMP);
533 vp->v_data = 0;
534
535 return (0);
536}
537
538/*
539 * Print out the contents of a /dev/fd vnode.
540 */
541/* ARGSUSED */
542static int
543fdesc_print(ap)
544 struct vop_print_args /* {
545 struct vnode *a_vp;
546 } */ *ap;
547{
548
549 printf("tag VT_NON, fdesc vnode\n");
550 return (0);
551}
552
553static struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
554 { &vop_default_desc, (vop_t *) vop_defaultop },
555 { &vop_access_desc, (vop_t *) vop_null },
556 { &vop_getattr_desc, (vop_t *) fdesc_getattr },
557 { &vop_inactive_desc, (vop_t *) fdesc_inactive },
558 { &vop_lookup_desc, (vop_t *) fdesc_lookup },
559 { &vop_open_desc, (vop_t *) fdesc_open },
560 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
561 { &vop_poll_desc, (vop_t *) fdesc_poll },
562 { &vop_print_desc, (vop_t *) fdesc_print },
563 { &vop_readdir_desc, (vop_t *) fdesc_readdir },
564 { &vop_reclaim_desc, (vop_t *) fdesc_reclaim },
565 { &vop_setattr_desc, (vop_t *) fdesc_setattr },
566 { NULL, NULL }
567};
568static struct vnodeopv_desc fdesc_vnodeop_opv_desc =
569 { &fdesc_vnodeop_p, fdesc_vnodeop_entries };
570
571VNODEOP_SET(fdesc_vnodeop_opv_desc);