Remove the thread pointer argument to lockmgr(). All lockmgr() ops use the
[dragonfly.git] / sys / vfs / fdesc / fdesc_vnops.c
CommitLineData
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MD
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 $
8ddc6004 39 * $DragonFly: src/sys/vfs/fdesc/fdesc_vnops.c,v 1.25 2006/04/01 20:46:53 dillon Exp $
984263bc
MD
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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MD
58#include <sys/socket.h>
59#include <sys/stat.h>
60#include <sys/vnode.h>
dadab5e9 61#include <sys/file2.h>
984263bc 62
709f67da
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63#include <machine/limits.h>
64
1f2de5d4 65#include "fdesc.h"
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MD
66
67#define FDL_WANT 0x01
68#define FDL_LOCKED 0x02
69static int fdcache_lock;
70
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71#define NFDCACHE 4
72#define FD_NHASH(ix) \
73 (&fdhashtbl[(ix) & fdhash])
74static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
75static u_long fdhash;
76
a6ee311a
RG
77static int fdesc_getattr (struct vop_getattr_args *ap);
78static int fdesc_inactive (struct vop_inactive_args *ap);
e62afb5f 79static int fdesc_lookup (struct vop_old_lookup_args *ap);
a6ee311a
RG
80static int fdesc_open (struct vop_open_args *ap);
81static int fdesc_print (struct vop_print_args *ap);
82static int fdesc_readdir (struct vop_readdir_args *ap);
83static int fdesc_reclaim (struct vop_reclaim_args *ap);
84static int fdesc_poll (struct vop_poll_args *ap);
85static int fdesc_setattr (struct vop_setattr_args *ap);
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MD
86
87/*
88 * Initialise cache headers
89 */
90int
130da09f 91fdesc_init(struct vfsconf *vfsp)
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MD
92{
93
94 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
95 return (0);
96}
97
43c45e8f
HP
98int
99fdesc_uninit(struct vfsconf *vfsp)
100{
101 if (fdhashtbl)
102 free(fdhashtbl, M_CACHE);
103 return (0);
104}
984263bc 105int
130da09f
CP
106fdesc_allocvp(fdntype ftype, int ix, struct mount *mp, struct vnode **vpp,
107 struct thread *td)
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MD
108{
109 struct fdhashhead *fc;
110 struct fdescnode *fd;
111 int error = 0;
112
113 fc = FD_NHASH(ix);
114loop:
115 LIST_FOREACH(fd, fc, fd_hash) {
116 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
5fd012e0 117 if (vget(fd->fd_vnode, LK_EXCLUSIVE|LK_SLEEPFAIL, td))
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MD
118 goto loop;
119 *vpp = fd->fd_vnode;
120 return (error);
121 }
122 }
123
124 /*
125 * otherwise lock the array while we call getnewvnode
126 * since that can block.
127 */
128 if (fdcache_lock & FDL_LOCKED) {
129 fdcache_lock |= FDL_WANT;
b1ce5639 130 tsleep((caddr_t) &fdcache_lock, 0, "fdalvp", 0);
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MD
131 goto loop;
132 }
133 fdcache_lock |= FDL_LOCKED;
134
135 /*
136 * Do the MALLOC before the getnewvnode since doing so afterward
137 * might cause a bogus v_data pointer to get dereferenced
138 * elsewhere if MALLOC should block.
139 */
140 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
141
6ddb7618 142 error = getnewvnode(VT_FDESC, mp, vpp, 0, 0);
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MD
143 if (error) {
144 FREE(fd, M_TEMP);
145 goto out;
146 }
147 (*vpp)->v_data = fd;
148 fd->fd_vnode = *vpp;
149 fd->fd_type = ftype;
150 fd->fd_fd = -1;
151 fd->fd_ix = ix;
152 LIST_INSERT_HEAD(fc, fd, fd_hash);
5fd012e0 153 vx_unlock(*vpp);
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MD
154
155out:
156 fdcache_lock &= ~FDL_LOCKED;
157
158 if (fdcache_lock & FDL_WANT) {
159 fdcache_lock &= ~FDL_WANT;
160 wakeup((caddr_t) &fdcache_lock);
161 }
162
163 return (error);
164}
165
166/*
167 * vp is the current namei directory
168 * ndp is the name to locate in that directory...
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CP
169 *
170 * fdesc_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
171 * struct componentname *a_cnp)
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MD
172 */
173static int
e62afb5f 174fdesc_lookup(struct vop_old_lookup_args *ap)
984263bc 175{
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MD
176 struct componentname *cnp = ap->a_cnp;
177 struct thread *td = cnp->cn_td;
178 struct proc *p = td->td_proc;
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MD
179 struct vnode **vpp = ap->a_vpp;
180 struct vnode *dvp = ap->a_dvp;
984263bc 181 char *pname = cnp->cn_nameptr;
984263bc 182 int nlen = cnp->cn_namelen;
dadab5e9 183 int nfiles;
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MD
184 u_int fd;
185 int error;
186 struct vnode *fvp;
187
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MD
188 KKASSERT(p);
189 nfiles = p->p_fd->fd_nfiles;
2b69e610 190 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME) {
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MD
191 error = EROFS;
192 goto bad;
193 }
194
5fd012e0 195 VOP_UNLOCK(dvp, 0, td);
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MD
196 if (cnp->cn_namelen == 1 && *pname == '.') {
197 *vpp = dvp;
597aea93 198 vref(dvp);
5fd012e0 199 vn_lock(dvp, LK_SHARED | LK_RETRY, td);
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MD
200 return (0);
201 }
202
203 if (VTOFDESC(dvp)->fd_type != Froot) {
204 error = ENOTDIR;
205 goto bad;
206 }
207
208 fd = 0;
209 /* the only time a leading 0 is acceptable is if it's "0" */
210 if (*pname == '0' && nlen != 1) {
211 error = ENOENT;
212 goto bad;
213 }
214 while (nlen--) {
215 if (*pname < '0' || *pname > '9') {
216 error = ENOENT;
217 goto bad;
218 }
219 fd = 10 * fd + *pname++ - '0';
220 }
221
0679adc4 222 if (fd >= nfiles || p->p_fd->fd_files[fd].fp == NULL) {
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MD
223 error = EBADF;
224 goto bad;
225 }
226
dadab5e9 227 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, td);
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MD
228 if (error)
229 goto bad;
230 VTOFDESC(fvp)->fd_fd = fd;
5fd012e0 231 vn_lock(fvp, LK_SHARED | LK_RETRY, td);
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MD
232 *vpp = fvp;
233 return (0);
234
235bad:
5fd012e0 236 vn_lock(dvp, LK_SHARED | LK_RETRY, td);
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MD
237 *vpp = NULL;
238 return (error);
239}
240
130da09f
CP
241/*
242 * fdesc_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
243 * struct thread *a_td)
244 */
984263bc 245static int
130da09f 246fdesc_open(struct vop_open_args *ap)
984263bc
MD
247{
248 struct vnode *vp = ap->a_vp;
bd6ec3e2 249 struct lwp *lp = ap->a_td->td_lwp;
dadab5e9 250
fbfe4e7d 251 KKASSERT(lp);
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252
253 if (VTOFDESC(vp)->fd_type == Froot)
8ddc6004 254 return (vop_stdopen(ap));
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MD
255
256 /*
fbfe4e7d 257 * XXX Kludge: set lp->lwp_dupfd to contain the value of the the file
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MD
258 * descriptor being sought for duplication. The error return ensures
259 * that the vnode for this device will be released by vn_open. Open
260 * will detect this special error and take the actions in dupfdopen.
261 * Other callers of vn_open or VOP_OPEN will simply report the
262 * error.
263 */
fbfe4e7d 264 lp->lwp_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
984263bc
MD
265 return (ENODEV);
266}
267
130da09f
CP
268/*
269 * fdesc_getattr(struct vnode *a_vp, struct vattr *a_vap,
270 * struct ucred *a_cred, struct thread *a_td)
271 */
984263bc 272static int
130da09f 273fdesc_getattr(struct vop_getattr_args *ap)
984263bc 274{
dadab5e9 275 struct proc *p = ap->a_td->td_proc;
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MD
276 struct vnode *vp = ap->a_vp;
277 struct vattr *vap = ap->a_vap;
dadab5e9 278 struct filedesc *fdp;
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MD
279 struct file *fp;
280 struct stat stb;
281 u_int fd;
282 int error = 0;
283
dadab5e9
MD
284 KKASSERT(p);
285 fdp = p->p_fd;
984263bc
MD
286 switch (VTOFDESC(vp)->fd_type) {
287 case Froot:
288 VATTR_NULL(vap);
289
290 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
291 vap->va_type = VDIR;
292 vap->va_nlink = 2;
293 vap->va_size = DEV_BSIZE;
294 vap->va_fileid = VTOFDESC(vp)->fd_ix;
295 vap->va_uid = 0;
296 vap->va_gid = 0;
297 vap->va_blocksize = DEV_BSIZE;
298 vap->va_atime.tv_sec = boottime.tv_sec;
299 vap->va_atime.tv_nsec = 0;
300 vap->va_mtime = vap->va_atime;
301 vap->va_ctime = vap->va_mtime;
302 vap->va_gen = 0;
303 vap->va_flags = 0;
304 vap->va_rdev = 0;
305 vap->va_bytes = 0;
306 break;
307
308 case Fdesc:
309 fd = VTOFDESC(vp)->fd_fd;
310
0679adc4 311 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_files[fd].fp) == NULL)
984263bc
MD
312 return (EBADF);
313
314 bzero(&stb, sizeof(stb));
dadab5e9 315 error = fo_stat(fp, &stb, ap->a_td);
984263bc
MD
316 if (error == 0) {
317 VATTR_NULL(vap);
318 vap->va_type = IFTOVT(stb.st_mode);
319 vap->va_mode = stb.st_mode;
320#define FDRX (VREAD|VEXEC)
321 if (vap->va_type == VDIR)
322 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
323#undef FDRX
324 vap->va_nlink = 1;
325 vap->va_flags = 0;
326 vap->va_bytes = stb.st_blocks * stb.st_blksize;
327 vap->va_fileid = VTOFDESC(vp)->fd_ix;
328 vap->va_size = stb.st_size;
329 vap->va_blocksize = stb.st_blksize;
330 vap->va_rdev = stb.st_rdev;
331
332 /*
333 * If no time data is provided, use the current time.
334 */
335 if (stb.st_atimespec.tv_sec == 0 &&
336 stb.st_atimespec.tv_nsec == 0)
337 nanotime(&stb.st_atimespec);
338
339 if (stb.st_ctimespec.tv_sec == 0 &&
340 stb.st_ctimespec.tv_nsec == 0)
341 nanotime(&stb.st_ctimespec);
342
343 if (stb.st_mtimespec.tv_sec == 0 &&
344 stb.st_mtimespec.tv_nsec == 0)
345 nanotime(&stb.st_mtimespec);
346
347 vap->va_atime = stb.st_atimespec;
348 vap->va_mtime = stb.st_mtimespec;
349 vap->va_ctime = stb.st_ctimespec;
350 vap->va_uid = stb.st_uid;
351 vap->va_gid = stb.st_gid;
352 }
353 break;
354
355 default:
356 panic("fdesc_getattr");
357 break;
358 }
359
360 if (error == 0)
361 vp->v_type = vap->va_type;
362 return (error);
363}
364
130da09f
CP
365/*
366 * fdesc_setattr(struct vnode *a_vp, struct vattr *a_vap,
367 * struct ucred *a_cred, struct thread *a_td)
368 */
984263bc 369static int
130da09f 370fdesc_setattr(struct vop_setattr_args *ap)
984263bc 371{
dadab5e9 372 struct proc *p = ap->a_td->td_proc;
984263bc
MD
373 struct vattr *vap = ap->a_vap;
374 struct file *fp;
375 unsigned fd;
376 int error;
377
378 /*
379 * Can't mess with the root vnode
380 */
381 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
382 return (EACCES);
383
384 fd = VTOFDESC(ap->a_vp)->fd_fd;
dadab5e9 385 KKASSERT(p);
984263bc
MD
386
387 /*
388 * Allow setattr where there is an underlying vnode.
389 */
dadab5e9 390 error = getvnode(p->p_fd, fd, &fp);
984263bc
MD
391 if (error) {
392 /*
393 * getvnode() returns EINVAL if the file descriptor is not
394 * backed by a vnode. Silently drop all changes except
395 * chflags(2) in this case.
396 */
397 if (error == EINVAL) {
398 if (vap->va_flags != VNOVAL)
399 error = EOPNOTSUPP;
400 else
401 error = 0;
402 }
403 return (error);
404 }
405 return (error);
406}
407
408#define UIO_MX 16
409
130da09f
CP
410/*
411 * fdesc_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
412 * int *a_eofflag, u_long *a_cookies, int a_ncookies)
413 */
984263bc 414static int
130da09f 415fdesc_readdir(struct vop_readdir_args *ap)
984263bc
MD
416{
417 struct uio *uio = ap->a_uio;
418 struct filedesc *fdp;
709f67da
JS
419 int error, i, fcnt;
420 size_t namelen;
421 char name[20]; /* enough for %d */
984263bc
MD
422
423 /*
424 * We don't allow exporting fdesc mounts, and currently local
425 * requests do not need cookies.
426 */
427 if (ap->a_ncookies)
428 panic("fdesc_readdir: not hungry");
429
430 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
431 panic("fdesc_readdir: not dir");
432
709f67da
JS
433 if (uio->uio_offset < 0 || uio->uio_offset > INT_MAX ||
434 uio->uio_resid < 0)
435 return(EINVAL);
436 i = uio->uio_offset;
dadab5e9
MD
437 KKASSERT(uio->uio_td->td_proc);
438 fdp = uio->uio_td->td_proc->p_fd;
984263bc
MD
439 error = 0;
440
441 fcnt = i - 2; /* The first two nodes are `.' and `..' */
442
709f67da 443 while (fcnt < fdp->fd_nfiles && uio->uio_resid > 0 && !error) {
984263bc
MD
444 switch (i) {
445 case 0: /* `.' */
709f67da
JS
446 if (vop_write_dirent(&error, uio, FD_ROOT + i, DT_DIR,
447 1, "."))
448 goto done;
449 if (error)
450 return (error);
451 break;
984263bc 452 case 1: /* `..' */
709f67da
JS
453 if (vop_write_dirent(&error, uio, FD_ROOT + i, DT_DIR,
454 2, ".."))
455 goto done;
456 if (error)
457 return (error);
984263bc
MD
458 break;
459 default:
709f67da
JS
460 if (fdp->fd_files[fcnt].fp == NULL) {
461 fcnt++;
462 continue;
463 }
464
465 namelen = snprintf(name, sizeof(name), "%d", fcnt);
466 if (vop_write_dirent(&error, uio, FD_ROOT + i,
467 DT_UNKNOWN, namelen, name))
984263bc 468 goto done;
709f67da
JS
469 if (error)
470 return (error);
984263bc
MD
471 break;
472 }
984263bc
MD
473 i++;
474 fcnt++;
475 }
476
477done:
709f67da
JS
478 if (i >= 2)
479 uio->uio_offset = fcnt + 2;
480 else
481 uio->uio_offset = i;
984263bc
MD
482 return (error);
483}
484
130da09f
CP
485/*
486 * fdesc_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred,
487 * struct thread *a_td)
488 */
984263bc 489static int
130da09f 490fdesc_poll(struct vop_poll_args *ap)
984263bc 491{
dadab5e9 492 return seltrue(0, ap->a_events, ap->a_td);
984263bc
MD
493}
494
130da09f
CP
495/*
496 * fdesc_inactive(struct vnode *a_vp, struct thread *a_td)
497 */
984263bc 498static int
130da09f 499fdesc_inactive(struct vop_inactive_args *ap)
984263bc
MD
500{
501 struct vnode *vp = ap->a_vp;
502
503 /*
504 * Clear out the v_type field to avoid
505 * nasty things happening in vgone().
506 */
984263bc
MD
507 vp->v_type = VNON;
508 return (0);
509}
510
130da09f
CP
511/*
512 * fdesc_reclaim(struct vnode *a_vp)
513 */
984263bc 514static int
130da09f 515fdesc_reclaim(struct vop_reclaim_args *ap)
984263bc
MD
516{
517 struct vnode *vp = ap->a_vp;
518 struct fdescnode *fd = VTOFDESC(vp);
519
520 LIST_REMOVE(fd, fd_hash);
521 FREE(vp->v_data, M_TEMP);
522 vp->v_data = 0;
523
524 return (0);
525}
526
527/*
528 * Print out the contents of a /dev/fd vnode.
130da09f
CP
529 *
530 * fdesc_print(struct vnode *a_vp)
984263bc
MD
531 */
532/* ARGSUSED */
533static int
130da09f 534fdesc_print(struct vop_print_args *ap)
984263bc 535{
984263bc
MD
536 printf("tag VT_NON, fdesc vnode\n");
537 return (0);
538}
539
0961aa92 540struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
625ddaba
JS
541 { &vop_default_desc, vop_defaultop },
542 { &vop_access_desc, vop_null },
543 { &vop_getattr_desc, (vnodeopv_entry_t) fdesc_getattr },
544 { &vop_inactive_desc, (vnodeopv_entry_t) fdesc_inactive },
e62afb5f 545 { &vop_old_lookup_desc, (vnodeopv_entry_t) fdesc_lookup },
625ddaba
JS
546 { &vop_open_desc, (vnodeopv_entry_t) fdesc_open },
547 { &vop_pathconf_desc, (vnodeopv_entry_t) vop_stdpathconf },
548 { &vop_poll_desc, (vnodeopv_entry_t) fdesc_poll },
549 { &vop_print_desc, (vnodeopv_entry_t) fdesc_print },
550 { &vop_readdir_desc, (vnodeopv_entry_t) fdesc_readdir },
551 { &vop_reclaim_desc, (vnodeopv_entry_t) fdesc_reclaim },
552 { &vop_setattr_desc, (vnodeopv_entry_t) fdesc_setattr },
984263bc
MD
553 { NULL, NULL }
554};
984263bc 555