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