Utilize vop_write_dirent. Slightly change the order by writing to
[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 $
43c45e8f 39 * $DragonFly: src/sys/vfs/fdesc/fdesc_vnops.c,v 1.19 2005/07/26 15:43:35 hmp Exp $
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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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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
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69#define NFDCACHE 4
70#define FD_NHASH(ix) \
71 (&fdhashtbl[(ix) & fdhash])
72static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
73static u_long fdhash;
74
a6ee311a
RG
75static int fdesc_getattr (struct vop_getattr_args *ap);
76static int fdesc_inactive (struct vop_inactive_args *ap);
77static int fdesc_lookup (struct vop_lookup_args *ap);
78static int fdesc_open (struct vop_open_args *ap);
79static int fdesc_print (struct vop_print_args *ap);
80static int fdesc_readdir (struct vop_readdir_args *ap);
81static int fdesc_reclaim (struct vop_reclaim_args *ap);
82static int fdesc_poll (struct vop_poll_args *ap);
83static int fdesc_setattr (struct vop_setattr_args *ap);
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84
85/*
86 * Initialise cache headers
87 */
88int
130da09f 89fdesc_init(struct vfsconf *vfsp)
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90{
91
92 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
93 return (0);
94}
95
43c45e8f
HP
96int
97fdesc_uninit(struct vfsconf *vfsp)
98{
99 if (fdhashtbl)
100 free(fdhashtbl, M_CACHE);
101 return (0);
102}
984263bc 103int
130da09f
CP
104fdesc_allocvp(fdntype ftype, int ix, struct mount *mp, struct vnode **vpp,
105 struct thread *td)
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MD
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) {
5fd012e0 115 if (vget(fd->fd_vnode, LK_EXCLUSIVE|LK_SLEEPFAIL, 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
6ddb7618 140 error = getnewvnode(VT_FDESC, mp, vpp, 0, 0);
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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);
5fd012e0 151 vx_unlock(*vpp);
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152
153out:
154 fdcache_lock &= ~FDL_LOCKED;
155
156 if (fdcache_lock & FDL_WANT) {
157 fdcache_lock &= ~FDL_WANT;
158 wakeup((caddr_t) &fdcache_lock);
159 }
160
161 return (error);
162}
163
164/*
165 * vp is the current namei directory
166 * ndp is the name to locate in that directory...
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CP
167 *
168 * fdesc_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
169 * struct componentname *a_cnp)
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170 */
171static int
130da09f 172fdesc_lookup(struct vop_lookup_args *ap)
984263bc 173{
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MD
174 struct componentname *cnp = ap->a_cnp;
175 struct thread *td = cnp->cn_td;
176 struct proc *p = td->td_proc;
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177 struct vnode **vpp = ap->a_vpp;
178 struct vnode *dvp = ap->a_dvp;
984263bc 179 char *pname = cnp->cn_nameptr;
984263bc 180 int nlen = cnp->cn_namelen;
dadab5e9 181 int nfiles;
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182 u_int fd;
183 int error;
184 struct vnode *fvp;
185
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MD
186 KKASSERT(p);
187 nfiles = p->p_fd->fd_nfiles;
2b69e610 188 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME) {
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189 error = EROFS;
190 goto bad;
191 }
192
5fd012e0 193 VOP_UNLOCK(dvp, 0, td);
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194 if (cnp->cn_namelen == 1 && *pname == '.') {
195 *vpp = dvp;
597aea93 196 vref(dvp);
5fd012e0 197 vn_lock(dvp, LK_SHARED | LK_RETRY, td);
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198 return (0);
199 }
200
201 if (VTOFDESC(dvp)->fd_type != Froot) {
202 error = ENOTDIR;
203 goto bad;
204 }
205
206 fd = 0;
207 /* the only time a leading 0 is acceptable is if it's "0" */
208 if (*pname == '0' && nlen != 1) {
209 error = ENOENT;
210 goto bad;
211 }
212 while (nlen--) {
213 if (*pname < '0' || *pname > '9') {
214 error = ENOENT;
215 goto bad;
216 }
217 fd = 10 * fd + *pname++ - '0';
218 }
219
0679adc4 220 if (fd >= nfiles || p->p_fd->fd_files[fd].fp == NULL) {
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221 error = EBADF;
222 goto bad;
223 }
224
dadab5e9 225 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, td);
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226 if (error)
227 goto bad;
228 VTOFDESC(fvp)->fd_fd = fd;
5fd012e0 229 vn_lock(fvp, LK_SHARED | LK_RETRY, td);
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230 *vpp = fvp;
231 return (0);
232
233bad:
5fd012e0 234 vn_lock(dvp, LK_SHARED | LK_RETRY, td);
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235 *vpp = NULL;
236 return (error);
237}
238
130da09f
CP
239/*
240 * fdesc_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
241 * struct thread *a_td)
242 */
984263bc 243static int
130da09f 244fdesc_open(struct vop_open_args *ap)
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245{
246 struct vnode *vp = ap->a_vp;
dadab5e9
MD
247 struct proc *p = ap->a_td->td_proc;
248
249 KKASSERT(p);
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250
251 if (VTOFDESC(vp)->fd_type == Froot)
252 return (0);
253
254 /*
255 * XXX Kludge: set p->p_dupfd to contain the value of the the file
256 * descriptor being sought for duplication. The error return ensures
257 * that the vnode for this device will be released by vn_open. Open
258 * will detect this special error and take the actions in dupfdopen.
259 * Other callers of vn_open or VOP_OPEN will simply report the
260 * error.
261 */
dadab5e9 262 p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
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263 return (ENODEV);
264}
265
130da09f
CP
266/*
267 * fdesc_getattr(struct vnode *a_vp, struct vattr *a_vap,
268 * struct ucred *a_cred, struct thread *a_td)
269 */
984263bc 270static int
130da09f 271fdesc_getattr(struct vop_getattr_args *ap)
984263bc 272{
dadab5e9 273 struct proc *p = ap->a_td->td_proc;
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274 struct vnode *vp = ap->a_vp;
275 struct vattr *vap = ap->a_vap;
dadab5e9 276 struct filedesc *fdp;
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277 struct file *fp;
278 struct stat stb;
279 u_int fd;
280 int error = 0;
281
dadab5e9
MD
282 KKASSERT(p);
283 fdp = p->p_fd;
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284 switch (VTOFDESC(vp)->fd_type) {
285 case Froot:
286 VATTR_NULL(vap);
287
288 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
289 vap->va_type = VDIR;
290 vap->va_nlink = 2;
291 vap->va_size = DEV_BSIZE;
292 vap->va_fileid = VTOFDESC(vp)->fd_ix;
293 vap->va_uid = 0;
294 vap->va_gid = 0;
295 vap->va_blocksize = DEV_BSIZE;
296 vap->va_atime.tv_sec = boottime.tv_sec;
297 vap->va_atime.tv_nsec = 0;
298 vap->va_mtime = vap->va_atime;
299 vap->va_ctime = vap->va_mtime;
300 vap->va_gen = 0;
301 vap->va_flags = 0;
302 vap->va_rdev = 0;
303 vap->va_bytes = 0;
304 break;
305
306 case Fdesc:
307 fd = VTOFDESC(vp)->fd_fd;
308
0679adc4 309 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_files[fd].fp) == NULL)
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310 return (EBADF);
311
312 bzero(&stb, sizeof(stb));
dadab5e9 313 error = fo_stat(fp, &stb, ap->a_td);
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MD
314 if (error == 0) {
315 VATTR_NULL(vap);
316 vap->va_type = IFTOVT(stb.st_mode);
317 vap->va_mode = stb.st_mode;
318#define FDRX (VREAD|VEXEC)
319 if (vap->va_type == VDIR)
320 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
321#undef FDRX
322 vap->va_nlink = 1;
323 vap->va_flags = 0;
324 vap->va_bytes = stb.st_blocks * stb.st_blksize;
325 vap->va_fileid = VTOFDESC(vp)->fd_ix;
326 vap->va_size = stb.st_size;
327 vap->va_blocksize = stb.st_blksize;
328 vap->va_rdev = stb.st_rdev;
329
330 /*
331 * If no time data is provided, use the current time.
332 */
333 if (stb.st_atimespec.tv_sec == 0 &&
334 stb.st_atimespec.tv_nsec == 0)
335 nanotime(&stb.st_atimespec);
336
337 if (stb.st_ctimespec.tv_sec == 0 &&
338 stb.st_ctimespec.tv_nsec == 0)
339 nanotime(&stb.st_ctimespec);
340
341 if (stb.st_mtimespec.tv_sec == 0 &&
342 stb.st_mtimespec.tv_nsec == 0)
343 nanotime(&stb.st_mtimespec);
344
345 vap->va_atime = stb.st_atimespec;
346 vap->va_mtime = stb.st_mtimespec;
347 vap->va_ctime = stb.st_ctimespec;
348 vap->va_uid = stb.st_uid;
349 vap->va_gid = stb.st_gid;
350 }
351 break;
352
353 default:
354 panic("fdesc_getattr");
355 break;
356 }
357
358 if (error == 0)
359 vp->v_type = vap->va_type;
360 return (error);
361}
362
130da09f
CP
363/*
364 * fdesc_setattr(struct vnode *a_vp, struct vattr *a_vap,
365 * struct ucred *a_cred, struct thread *a_td)
366 */
984263bc 367static int
130da09f 368fdesc_setattr(struct vop_setattr_args *ap)
984263bc 369{
dadab5e9 370 struct proc *p = ap->a_td->td_proc;
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MD
371 struct vattr *vap = ap->a_vap;
372 struct file *fp;
373 unsigned fd;
374 int error;
375
376 /*
377 * Can't mess with the root vnode
378 */
379 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
380 return (EACCES);
381
382 fd = VTOFDESC(ap->a_vp)->fd_fd;
dadab5e9 383 KKASSERT(p);
984263bc
MD
384
385 /*
386 * Allow setattr where there is an underlying vnode.
387 */
dadab5e9 388 error = getvnode(p->p_fd, fd, &fp);
984263bc
MD
389 if (error) {
390 /*
391 * getvnode() returns EINVAL if the file descriptor is not
392 * backed by a vnode. Silently drop all changes except
393 * chflags(2) in this case.
394 */
395 if (error == EINVAL) {
396 if (vap->va_flags != VNOVAL)
397 error = EOPNOTSUPP;
398 else
399 error = 0;
400 }
401 return (error);
402 }
403 return (error);
404}
405
406#define UIO_MX 16
407
130da09f
CP
408/*
409 * fdesc_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
410 * int *a_eofflag, u_long *a_cookies, int a_ncookies)
411 */
984263bc 412static int
130da09f 413fdesc_readdir(struct vop_readdir_args *ap)
984263bc
MD
414{
415 struct uio *uio = ap->a_uio;
416 struct filedesc *fdp;
417 struct dirent d;
418 struct dirent *dp = &d;
419 int error, i, off, fcnt;
420
421 /*
422 * We don't allow exporting fdesc mounts, and currently local
423 * requests do not need cookies.
424 */
425 if (ap->a_ncookies)
426 panic("fdesc_readdir: not hungry");
427
428 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
429 panic("fdesc_readdir: not dir");
430
431 off = (int)uio->uio_offset;
432 if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
433 uio->uio_resid < UIO_MX)
434 return (EINVAL);
435 i = (u_int)off / UIO_MX;
dadab5e9
MD
436 KKASSERT(uio->uio_td->td_proc);
437 fdp = uio->uio_td->td_proc->p_fd;
984263bc
MD
438 error = 0;
439
440 fcnt = i - 2; /* The first two nodes are `.' and `..' */
441
442 while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
443 switch (i) {
444 case 0: /* `.' */
445 case 1: /* `..' */
446 bzero((caddr_t)dp, UIO_MX);
447
448 dp->d_fileno = i + FD_ROOT;
449 dp->d_namlen = i + 1;
450 dp->d_reclen = UIO_MX;
451 bcopy("..", dp->d_name, dp->d_namlen);
452 dp->d_name[i + 1] = '\0';
453 dp->d_type = DT_DIR;
454 break;
455 default:
0679adc4 456 if (fdp->fd_files[fcnt].fp == NULL)
984263bc
MD
457 goto done;
458
459 bzero((caddr_t) dp, UIO_MX);
460 dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
461 dp->d_reclen = UIO_MX;
462 dp->d_type = DT_UNKNOWN;
463 dp->d_fileno = i + FD_DESC;
464 break;
465 }
466 /*
467 * And ship to userland
468 */
469 error = uiomove((caddr_t) dp, UIO_MX, uio);
470 if (error)
471 break;
472 i++;
473 fcnt++;
474 }
475
476done:
477 uio->uio_offset = i * UIO_MX;
478 return (error);
479}
480
130da09f
CP
481/*
482 * fdesc_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred,
483 * struct thread *a_td)
484 */
984263bc 485static int
130da09f 486fdesc_poll(struct vop_poll_args *ap)
984263bc 487{
dadab5e9 488 return seltrue(0, ap->a_events, ap->a_td);
984263bc
MD
489}
490
130da09f
CP
491/*
492 * fdesc_inactive(struct vnode *a_vp, struct thread *a_td)
493 */
984263bc 494static int
130da09f 495fdesc_inactive(struct vop_inactive_args *ap)
984263bc
MD
496{
497 struct vnode *vp = ap->a_vp;
498
499 /*
500 * Clear out the v_type field to avoid
501 * nasty things happening in vgone().
502 */
984263bc
MD
503 vp->v_type = VNON;
504 return (0);
505}
506
130da09f
CP
507/*
508 * fdesc_reclaim(struct vnode *a_vp)
509 */
984263bc 510static int
130da09f 511fdesc_reclaim(struct vop_reclaim_args *ap)
984263bc
MD
512{
513 struct vnode *vp = ap->a_vp;
514 struct fdescnode *fd = VTOFDESC(vp);
515
516 LIST_REMOVE(fd, fd_hash);
517 FREE(vp->v_data, M_TEMP);
518 vp->v_data = 0;
519
520 return (0);
521}
522
523/*
524 * Print out the contents of a /dev/fd vnode.
130da09f
CP
525 *
526 * fdesc_print(struct vnode *a_vp)
984263bc
MD
527 */
528/* ARGSUSED */
529static int
130da09f 530fdesc_print(struct vop_print_args *ap)
984263bc 531{
984263bc
MD
532 printf("tag VT_NON, fdesc vnode\n");
533 return (0);
534}
535
0961aa92 536struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
625ddaba
JS
537 { &vop_default_desc, vop_defaultop },
538 { &vop_access_desc, vop_null },
539 { &vop_getattr_desc, (vnodeopv_entry_t) fdesc_getattr },
540 { &vop_inactive_desc, (vnodeopv_entry_t) fdesc_inactive },
541 { &vop_lookup_desc, (vnodeopv_entry_t) fdesc_lookup },
542 { &vop_open_desc, (vnodeopv_entry_t) fdesc_open },
543 { &vop_pathconf_desc, (vnodeopv_entry_t) vop_stdpathconf },
544 { &vop_poll_desc, (vnodeopv_entry_t) fdesc_poll },
545 { &vop_print_desc, (vnodeopv_entry_t) fdesc_print },
546 { &vop_readdir_desc, (vnodeopv_entry_t) fdesc_readdir },
547 { &vop_reclaim_desc, (vnodeopv_entry_t) fdesc_reclaim },
548 { &vop_setattr_desc, (vnodeopv_entry_t) fdesc_setattr },
984263bc
MD
549 { NULL, NULL }
550};
984263bc 551