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 *
| 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: head/sys/fs/fdescfs/fdesc_vnops.c 111119 2003-02-19 05:47:46Z imp $
| 38 * $FreeBSD: head/sys/fs/fdescfs/fdesc_vnops.c 111741 2003-03-02 15:50:23Z des $
|
39 */
40
41/*
42 * /dev/fd Filesystem
43 */
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/conf.h>
48#include <sys/dirent.h>
49#include <sys/filedesc.h>
50#include <sys/kernel.h> /* boottime */
51#include <sys/lock.h>
52#include <sys/mutex.h>
53#include <sys/malloc.h>
54#include <sys/file.h> /* Must come after sys/malloc.h */
55#include <sys/mount.h>
56#include <sys/namei.h>
57#include <sys/proc.h>
58#include <sys/stat.h>
59#include <sys/vnode.h>
60
61#include <fs/fdescfs/fdesc.h>
62
63#define FDL_WANT 0x01
64#define FDL_LOCKED 0x02
65static int fdcache_lock;
66
67static vop_t **fdesc_vnodeop_p;
68
69#define NFDCACHE 4
70#define FD_NHASH(ix) \
71 (&fdhashtbl[(ix) & fdhash])
72static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
73static u_long fdhash;
74
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_readdir(struct vop_readdir_args *ap);
80static int fdesc_reclaim(struct vop_reclaim_args *ap);
81static int fdesc_poll(struct vop_poll_args *ap);
82static int fdesc_setattr(struct vop_setattr_args *ap);
83
84/*
85 * Initialise cache headers
86 */
87int
88fdesc_init(vfsp)
89 struct vfsconf *vfsp;
90{
91
92 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
93 return (0);
94}
95
96int
97fdesc_allocvp(ftype, ix, mp, vpp, td)
98 fdntype ftype;
99 int ix;
100 struct mount *mp;
101 struct vnode **vpp;
102 struct thread *td;
103{
104 struct fdhashhead *fc;
105 struct fdescnode *fd;
106 int error = 0;
107
108 fc = FD_NHASH(ix);
109loop:
110 LIST_FOREACH(fd, fc, fd_hash) {
111 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
112 if (vget(fd->fd_vnode, 0, td))
113 goto loop;
114 *vpp = fd->fd_vnode;
115 return (error);
116 }
117 }
118
119 /*
120 * otherwise lock the array while we call getnewvnode
121 * since that can block.
122 */
123 if (fdcache_lock & FDL_LOCKED) {
124 fdcache_lock |= FDL_WANT;
125 (void) tsleep((caddr_t) &fdcache_lock, PINOD, "fdalvp", 0);
126 goto loop;
127 }
128 fdcache_lock |= FDL_LOCKED;
129
130 /*
131 * Do the MALLOC before the getnewvnode since doing so afterward
132 * might cause a bogus v_data pointer to get dereferenced
133 * elsewhere if MALLOC should block.
134 */
135 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
136
137 error = getnewvnode("fdesc", mp, fdesc_vnodeop_p, vpp);
138 if (error) {
139 FREE(fd, M_TEMP);
140 goto out;
141 }
142 (*vpp)->v_data = fd;
143 fd->fd_vnode = *vpp;
144 fd->fd_type = ftype;
145 fd->fd_fd = -1;
146 fd->fd_ix = ix;
147 LIST_INSERT_HEAD(fc, fd, fd_hash);
148
149out:
150 fdcache_lock &= ~FDL_LOCKED;
151
152 if (fdcache_lock & FDL_WANT) {
153 fdcache_lock &= ~FDL_WANT;
154 wakeup((caddr_t) &fdcache_lock);
155 }
156
157 return (error);
158}
159
160/*
161 * vp is the current namei directory
162 * ndp is the name to locate in that directory...
163 */
164static int
165fdesc_lookup(ap)
166 struct vop_lookup_args /* {
167 struct vnode * a_dvp;
168 struct vnode ** a_vpp;
169 struct componentname * a_cnp;
170 } */ *ap;
171{
172 struct vnode **vpp = ap->a_vpp;
173 struct vnode *dvp = ap->a_dvp;
174 struct componentname *cnp = ap->a_cnp;
175 char *pname = cnp->cn_nameptr;
176 struct thread *td = cnp->cn_thread;
177 struct file *fp;
178 int nlen = cnp->cn_namelen;
179 u_int fd;
180 int error;
181 struct vnode *fvp;
182
183 if ((cnp->cn_flags & ISLASTCN) &&
184 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) {
185 error = EROFS;
186 goto bad;
187 }
188
189 VOP_UNLOCK(dvp, 0, td);
190 if (cnp->cn_namelen == 1 && *pname == '.') {
191 *vpp = dvp;
192 VREF(dvp);
193 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
194 return (0);
195 }
196
197 if (VTOFDESC(dvp)->fd_type != Froot) {
198 error = ENOTDIR;
199 goto bad;
200 }
201
202 fd = 0;
203 /* the only time a leading 0 is acceptable is if it's "0" */
204 if (*pname == '0' && nlen != 1) {
205 error = ENOENT;
206 goto bad;
207 }
208 while (nlen--) {
209 if (*pname < '0' || *pname > '9') {
210 error = ENOENT;
211 goto bad;
212 }
213 fd = 10 * fd + *pname++ - '0';
214 }
215
216 if ((error = fget(td, fd, &fp)) != 0)
217 goto bad;
218
219 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, td);
220 fdrop(fp, td);
221 if (error)
222 goto bad;
223 VTOFDESC(fvp)->fd_fd = fd;
224 vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, td);
225 *vpp = fvp;
226 return (0);
227
228bad:
229 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
230 *vpp = NULL;
231 return (error);
232}
233
234static int
235fdesc_open(ap)
236 struct vop_open_args /* {
237 struct vnode *a_vp;
238 int a_mode;
239 struct ucred *a_cred;
240 struct thread *a_td;
241 } */ *ap;
242{
243 struct vnode *vp = ap->a_vp;
244
245 if (VTOFDESC(vp)->fd_type == Froot)
246 return (0);
247
248 /*
249 * XXX Kludge: set td->td_proc->p_dupfd to contain the value of the the file
250 * descriptor being sought for duplication. The error return ensures
251 * that the vnode for this device will be released by vn_open. Open
252 * will detect this special error and take the actions in dupfdopen.
253 * Other callers of vn_open or VOP_OPEN will simply report the
254 * error.
255 */
256 ap->a_td->td_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
257 return (ENODEV);
258}
259
260static int
261fdesc_getattr(ap)
262 struct vop_getattr_args /* {
263 struct vnode *a_vp;
264 struct vattr *a_vap;
265 struct ucred *a_cred;
266 struct thread *a_td;
267 } */ *ap;
268{
269 struct vnode *vp = ap->a_vp;
270 struct vattr *vap = ap->a_vap;
271 struct file *fp;
272 struct stat stb;
273 u_int fd;
274 int error = 0;
275
276 switch (VTOFDESC(vp)->fd_type) {
277 case Froot:
278 VATTR_NULL(vap);
279
280 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
281 vap->va_type = VDIR;
282 vap->va_nlink = 2;
283 vap->va_size = DEV_BSIZE;
284 vap->va_fileid = VTOFDESC(vp)->fd_ix;
285 vap->va_uid = 0;
286 vap->va_gid = 0;
287 vap->va_blocksize = DEV_BSIZE;
288 vap->va_atime.tv_sec = boottime.tv_sec;
289 vap->va_atime.tv_nsec = 0;
290 vap->va_mtime = vap->va_atime;
291 vap->va_ctime = vap->va_mtime;
292 vap->va_gen = 0;
293 vap->va_flags = 0;
294 vap->va_rdev = 0;
295 vap->va_bytes = 0;
296 break;
297
298 case Fdesc:
299 fd = VTOFDESC(vp)->fd_fd;
300
301 if ((error = fget(ap->a_td, fd, &fp)) != 0)
302 return (error);
303
304 bzero(&stb, sizeof(stb));
305 error = fo_stat(fp, &stb, ap->a_td->td_ucred, ap->a_td);
306 fdrop(fp, ap->a_td);
307 if (error == 0) {
308 VATTR_NULL(vap);
309 vap->va_type = IFTOVT(stb.st_mode);
310 vap->va_mode = stb.st_mode;
311#define FDRX (VREAD|VEXEC)
312 if (vap->va_type == VDIR)
313 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
314#undef FDRX
315 vap->va_nlink = 1;
316 vap->va_flags = 0;
317 vap->va_bytes = stb.st_blocks * stb.st_blksize;
318 vap->va_fileid = VTOFDESC(vp)->fd_ix;
319 vap->va_size = stb.st_size;
320 vap->va_blocksize = stb.st_blksize;
321 vap->va_rdev = stb.st_rdev;
322
323 /*
324 * If no time data is provided, use the current time.
325 */
326 if (stb.st_atimespec.tv_sec == 0 &&
327 stb.st_atimespec.tv_nsec == 0)
328 nanotime(&stb.st_atimespec);
329
330 if (stb.st_ctimespec.tv_sec == 0 &&
331 stb.st_ctimespec.tv_nsec == 0)
332 nanotime(&stb.st_ctimespec);
333
334 if (stb.st_mtimespec.tv_sec == 0 &&
335 stb.st_mtimespec.tv_nsec == 0)
336 nanotime(&stb.st_mtimespec);
337
338 vap->va_atime = stb.st_atimespec;
339 vap->va_mtime = stb.st_mtimespec;
340 vap->va_ctime = stb.st_ctimespec;
341 vap->va_uid = stb.st_uid;
342 vap->va_gid = stb.st_gid;
343 }
344 break;
345
346 default:
347 panic("fdesc_getattr");
348 break;
349 }
350
351 if (error == 0)
352 vp->v_type = vap->va_type;
353 return (error);
354}
355
356static int
357fdesc_setattr(ap)
358 struct vop_setattr_args /* {
359 struct vnode *a_vp;
360 struct vattr *a_vap;
361 struct ucred *a_cred;
362 struct thread *a_td;
363 } */ *ap;
364{
365 struct vattr *vap = ap->a_vap;
366 struct vnode *vp;
367 struct mount *mp;
368 struct file *fp;
369 unsigned fd;
370 int error;
371
372 /*
373 * Can't mess with the root vnode
374 */
375 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
376 return (EACCES);
377
378 fd = VTOFDESC(ap->a_vp)->fd_fd;
379
380 /*
381 * Allow setattr where there is an underlying vnode.
382 */
383 error = getvnode(ap->a_td->td_proc->p_fd, fd, &fp);
384 if (error) {
385 /*
386 * getvnode() returns EINVAL if the file descriptor is not
387 * backed by a vnode. Silently drop all changes except
388 * chflags(2) in this case.
389 */
390 if (error == EINVAL) {
391 if (vap->va_flags != VNOVAL)
392 error = EOPNOTSUPP;
393 else
394 error = 0;
395 }
396 return (error);
397 }
398 vp = fp->f_data;
399 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
400 fdrop(fp, ap->a_td);
401 return (error);
402 }
403 error = VOP_SETATTR(vp, ap->a_vap, ap->a_cred, ap->a_td);
404 vn_finished_write(mp);
405 fdrop(fp, ap->a_td);
406 return (error);
407}
408
409#define UIO_MX 16
410
411static int
412fdesc_readdir(ap)
413 struct vop_readdir_args /* {
414 struct vnode *a_vp;
415 struct uio *a_uio;
416 struct ucred *a_cred;
417 int *a_eofflag;
418 u_long *a_cookies;
419 int a_ncookies;
420 } */ *ap;
421{
422 struct uio *uio = ap->a_uio;
423 struct filedesc *fdp;
424 struct dirent d;
425 struct dirent *dp = &d;
426 int error, i, off, fcnt;
427
428 /*
429 * We don't allow exporting fdesc mounts, and currently local
430 * requests do not need cookies.
431 */
432 if (ap->a_ncookies)
433 panic("fdesc_readdir: not hungry");
434
435 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
436 panic("fdesc_readdir: not dir");
437
438 off = (int)uio->uio_offset;
439 if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
440 uio->uio_resid < UIO_MX)
441 return (EINVAL);
442 i = (u_int)off / UIO_MX;
443 fdp = uio->uio_td->td_proc->p_fd;
444 error = 0;
445
446 fcnt = i - 2; /* The first two nodes are `.' and `..' */
447
448 FILEDESC_LOCK(fdp);
449 while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
450 switch (i) {
451 case 0: /* `.' */
452 case 1: /* `..' */
453 bzero((caddr_t)dp, UIO_MX);
454
455 dp->d_fileno = i + FD_ROOT;
456 dp->d_namlen = i + 1;
457 dp->d_reclen = UIO_MX;
458 bcopy("..", dp->d_name, dp->d_namlen);
459 dp->d_name[i + 1] = '\0';
460 dp->d_type = DT_DIR;
461 break;
462 default:
463 if (fdp->fd_ofiles[fcnt] == NULL) {
464 FILEDESC_UNLOCK(fdp);
465 goto done;
466 }
467
468 bzero((caddr_t) dp, UIO_MX);
469 dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
470 dp->d_reclen = UIO_MX;
471 dp->d_type = DT_UNKNOWN;
472 dp->d_fileno = i + FD_DESC;
473 break;
474 }
475 /*
476 * And ship to userland
477 */
478 FILEDESC_UNLOCK(fdp);
| 39 */
40
41/*
42 * /dev/fd Filesystem
43 */
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/conf.h>
48#include <sys/dirent.h>
49#include <sys/filedesc.h>
50#include <sys/kernel.h> /* boottime */
51#include <sys/lock.h>
52#include <sys/mutex.h>
53#include <sys/malloc.h>
54#include <sys/file.h> /* Must come after sys/malloc.h */
55#include <sys/mount.h>
56#include <sys/namei.h>
57#include <sys/proc.h>
58#include <sys/stat.h>
59#include <sys/vnode.h>
60
61#include <fs/fdescfs/fdesc.h>
62
63#define FDL_WANT 0x01
64#define FDL_LOCKED 0x02
65static int fdcache_lock;
66
67static vop_t **fdesc_vnodeop_p;
68
69#define NFDCACHE 4
70#define FD_NHASH(ix) \
71 (&fdhashtbl[(ix) & fdhash])
72static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
73static u_long fdhash;
74
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_readdir(struct vop_readdir_args *ap);
80static int fdesc_reclaim(struct vop_reclaim_args *ap);
81static int fdesc_poll(struct vop_poll_args *ap);
82static int fdesc_setattr(struct vop_setattr_args *ap);
83
84/*
85 * Initialise cache headers
86 */
87int
88fdesc_init(vfsp)
89 struct vfsconf *vfsp;
90{
91
92 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
93 return (0);
94}
95
96int
97fdesc_allocvp(ftype, ix, mp, vpp, td)
98 fdntype ftype;
99 int ix;
100 struct mount *mp;
101 struct vnode **vpp;
102 struct thread *td;
103{
104 struct fdhashhead *fc;
105 struct fdescnode *fd;
106 int error = 0;
107
108 fc = FD_NHASH(ix);
109loop:
110 LIST_FOREACH(fd, fc, fd_hash) {
111 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
112 if (vget(fd->fd_vnode, 0, td))
113 goto loop;
114 *vpp = fd->fd_vnode;
115 return (error);
116 }
117 }
118
119 /*
120 * otherwise lock the array while we call getnewvnode
121 * since that can block.
122 */
123 if (fdcache_lock & FDL_LOCKED) {
124 fdcache_lock |= FDL_WANT;
125 (void) tsleep((caddr_t) &fdcache_lock, PINOD, "fdalvp", 0);
126 goto loop;
127 }
128 fdcache_lock |= FDL_LOCKED;
129
130 /*
131 * Do the MALLOC before the getnewvnode since doing so afterward
132 * might cause a bogus v_data pointer to get dereferenced
133 * elsewhere if MALLOC should block.
134 */
135 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
136
137 error = getnewvnode("fdesc", mp, fdesc_vnodeop_p, vpp);
138 if (error) {
139 FREE(fd, M_TEMP);
140 goto out;
141 }
142 (*vpp)->v_data = fd;
143 fd->fd_vnode = *vpp;
144 fd->fd_type = ftype;
145 fd->fd_fd = -1;
146 fd->fd_ix = ix;
147 LIST_INSERT_HEAD(fc, fd, fd_hash);
148
149out:
150 fdcache_lock &= ~FDL_LOCKED;
151
152 if (fdcache_lock & FDL_WANT) {
153 fdcache_lock &= ~FDL_WANT;
154 wakeup((caddr_t) &fdcache_lock);
155 }
156
157 return (error);
158}
159
160/*
161 * vp is the current namei directory
162 * ndp is the name to locate in that directory...
163 */
164static int
165fdesc_lookup(ap)
166 struct vop_lookup_args /* {
167 struct vnode * a_dvp;
168 struct vnode ** a_vpp;
169 struct componentname * a_cnp;
170 } */ *ap;
171{
172 struct vnode **vpp = ap->a_vpp;
173 struct vnode *dvp = ap->a_dvp;
174 struct componentname *cnp = ap->a_cnp;
175 char *pname = cnp->cn_nameptr;
176 struct thread *td = cnp->cn_thread;
177 struct file *fp;
178 int nlen = cnp->cn_namelen;
179 u_int fd;
180 int error;
181 struct vnode *fvp;
182
183 if ((cnp->cn_flags & ISLASTCN) &&
184 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) {
185 error = EROFS;
186 goto bad;
187 }
188
189 VOP_UNLOCK(dvp, 0, td);
190 if (cnp->cn_namelen == 1 && *pname == '.') {
191 *vpp = dvp;
192 VREF(dvp);
193 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
194 return (0);
195 }
196
197 if (VTOFDESC(dvp)->fd_type != Froot) {
198 error = ENOTDIR;
199 goto bad;
200 }
201
202 fd = 0;
203 /* the only time a leading 0 is acceptable is if it's "0" */
204 if (*pname == '0' && nlen != 1) {
205 error = ENOENT;
206 goto bad;
207 }
208 while (nlen--) {
209 if (*pname < '0' || *pname > '9') {
210 error = ENOENT;
211 goto bad;
212 }
213 fd = 10 * fd + *pname++ - '0';
214 }
215
216 if ((error = fget(td, fd, &fp)) != 0)
217 goto bad;
218
219 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, td);
220 fdrop(fp, td);
221 if (error)
222 goto bad;
223 VTOFDESC(fvp)->fd_fd = fd;
224 vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, td);
225 *vpp = fvp;
226 return (0);
227
228bad:
229 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
230 *vpp = NULL;
231 return (error);
232}
233
234static int
235fdesc_open(ap)
236 struct vop_open_args /* {
237 struct vnode *a_vp;
238 int a_mode;
239 struct ucred *a_cred;
240 struct thread *a_td;
241 } */ *ap;
242{
243 struct vnode *vp = ap->a_vp;
244
245 if (VTOFDESC(vp)->fd_type == Froot)
246 return (0);
247
248 /*
249 * XXX Kludge: set td->td_proc->p_dupfd to contain the value of the the file
250 * descriptor being sought for duplication. The error return ensures
251 * that the vnode for this device will be released by vn_open. Open
252 * will detect this special error and take the actions in dupfdopen.
253 * Other callers of vn_open or VOP_OPEN will simply report the
254 * error.
255 */
256 ap->a_td->td_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
257 return (ENODEV);
258}
259
260static int
261fdesc_getattr(ap)
262 struct vop_getattr_args /* {
263 struct vnode *a_vp;
264 struct vattr *a_vap;
265 struct ucred *a_cred;
266 struct thread *a_td;
267 } */ *ap;
268{
269 struct vnode *vp = ap->a_vp;
270 struct vattr *vap = ap->a_vap;
271 struct file *fp;
272 struct stat stb;
273 u_int fd;
274 int error = 0;
275
276 switch (VTOFDESC(vp)->fd_type) {
277 case Froot:
278 VATTR_NULL(vap);
279
280 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
281 vap->va_type = VDIR;
282 vap->va_nlink = 2;
283 vap->va_size = DEV_BSIZE;
284 vap->va_fileid = VTOFDESC(vp)->fd_ix;
285 vap->va_uid = 0;
286 vap->va_gid = 0;
287 vap->va_blocksize = DEV_BSIZE;
288 vap->va_atime.tv_sec = boottime.tv_sec;
289 vap->va_atime.tv_nsec = 0;
290 vap->va_mtime = vap->va_atime;
291 vap->va_ctime = vap->va_mtime;
292 vap->va_gen = 0;
293 vap->va_flags = 0;
294 vap->va_rdev = 0;
295 vap->va_bytes = 0;
296 break;
297
298 case Fdesc:
299 fd = VTOFDESC(vp)->fd_fd;
300
301 if ((error = fget(ap->a_td, fd, &fp)) != 0)
302 return (error);
303
304 bzero(&stb, sizeof(stb));
305 error = fo_stat(fp, &stb, ap->a_td->td_ucred, ap->a_td);
306 fdrop(fp, ap->a_td);
307 if (error == 0) {
308 VATTR_NULL(vap);
309 vap->va_type = IFTOVT(stb.st_mode);
310 vap->va_mode = stb.st_mode;
311#define FDRX (VREAD|VEXEC)
312 if (vap->va_type == VDIR)
313 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
314#undef FDRX
315 vap->va_nlink = 1;
316 vap->va_flags = 0;
317 vap->va_bytes = stb.st_blocks * stb.st_blksize;
318 vap->va_fileid = VTOFDESC(vp)->fd_ix;
319 vap->va_size = stb.st_size;
320 vap->va_blocksize = stb.st_blksize;
321 vap->va_rdev = stb.st_rdev;
322
323 /*
324 * If no time data is provided, use the current time.
325 */
326 if (stb.st_atimespec.tv_sec == 0 &&
327 stb.st_atimespec.tv_nsec == 0)
328 nanotime(&stb.st_atimespec);
329
330 if (stb.st_ctimespec.tv_sec == 0 &&
331 stb.st_ctimespec.tv_nsec == 0)
332 nanotime(&stb.st_ctimespec);
333
334 if (stb.st_mtimespec.tv_sec == 0 &&
335 stb.st_mtimespec.tv_nsec == 0)
336 nanotime(&stb.st_mtimespec);
337
338 vap->va_atime = stb.st_atimespec;
339 vap->va_mtime = stb.st_mtimespec;
340 vap->va_ctime = stb.st_ctimespec;
341 vap->va_uid = stb.st_uid;
342 vap->va_gid = stb.st_gid;
343 }
344 break;
345
346 default:
347 panic("fdesc_getattr");
348 break;
349 }
350
351 if (error == 0)
352 vp->v_type = vap->va_type;
353 return (error);
354}
355
356static int
357fdesc_setattr(ap)
358 struct vop_setattr_args /* {
359 struct vnode *a_vp;
360 struct vattr *a_vap;
361 struct ucred *a_cred;
362 struct thread *a_td;
363 } */ *ap;
364{
365 struct vattr *vap = ap->a_vap;
366 struct vnode *vp;
367 struct mount *mp;
368 struct file *fp;
369 unsigned fd;
370 int error;
371
372 /*
373 * Can't mess with the root vnode
374 */
375 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
376 return (EACCES);
377
378 fd = VTOFDESC(ap->a_vp)->fd_fd;
379
380 /*
381 * Allow setattr where there is an underlying vnode.
382 */
383 error = getvnode(ap->a_td->td_proc->p_fd, fd, &fp);
384 if (error) {
385 /*
386 * getvnode() returns EINVAL if the file descriptor is not
387 * backed by a vnode. Silently drop all changes except
388 * chflags(2) in this case.
389 */
390 if (error == EINVAL) {
391 if (vap->va_flags != VNOVAL)
392 error = EOPNOTSUPP;
393 else
394 error = 0;
395 }
396 return (error);
397 }
398 vp = fp->f_data;
399 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
400 fdrop(fp, ap->a_td);
401 return (error);
402 }
403 error = VOP_SETATTR(vp, ap->a_vap, ap->a_cred, ap->a_td);
404 vn_finished_write(mp);
405 fdrop(fp, ap->a_td);
406 return (error);
407}
408
409#define UIO_MX 16
410
411static int
412fdesc_readdir(ap)
413 struct vop_readdir_args /* {
414 struct vnode *a_vp;
415 struct uio *a_uio;
416 struct ucred *a_cred;
417 int *a_eofflag;
418 u_long *a_cookies;
419 int a_ncookies;
420 } */ *ap;
421{
422 struct uio *uio = ap->a_uio;
423 struct filedesc *fdp;
424 struct dirent d;
425 struct dirent *dp = &d;
426 int error, i, off, fcnt;
427
428 /*
429 * We don't allow exporting fdesc mounts, and currently local
430 * requests do not need cookies.
431 */
432 if (ap->a_ncookies)
433 panic("fdesc_readdir: not hungry");
434
435 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
436 panic("fdesc_readdir: not dir");
437
438 off = (int)uio->uio_offset;
439 if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
440 uio->uio_resid < UIO_MX)
441 return (EINVAL);
442 i = (u_int)off / UIO_MX;
443 fdp = uio->uio_td->td_proc->p_fd;
444 error = 0;
445
446 fcnt = i - 2; /* The first two nodes are `.' and `..' */
447
448 FILEDESC_LOCK(fdp);
449 while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
450 switch (i) {
451 case 0: /* `.' */
452 case 1: /* `..' */
453 bzero((caddr_t)dp, UIO_MX);
454
455 dp->d_fileno = i + FD_ROOT;
456 dp->d_namlen = i + 1;
457 dp->d_reclen = UIO_MX;
458 bcopy("..", dp->d_name, dp->d_namlen);
459 dp->d_name[i + 1] = '\0';
460 dp->d_type = DT_DIR;
461 break;
462 default:
463 if (fdp->fd_ofiles[fcnt] == NULL) {
464 FILEDESC_UNLOCK(fdp);
465 goto done;
466 }
467
468 bzero((caddr_t) dp, UIO_MX);
469 dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
470 dp->d_reclen = UIO_MX;
471 dp->d_type = DT_UNKNOWN;
472 dp->d_fileno = i + FD_DESC;
473 break;
474 }
475 /*
476 * And ship to userland
477 */
478 FILEDESC_UNLOCK(fdp);
|
479 error = uiomove((caddr_t) dp, UIO_MX, uio);
| 479 error = uiomove(dp, UIO_MX, uio);
|
480 if (error)
481 goto done;
482 FILEDESC_LOCK(fdp);
483 i++;
484 fcnt++;
485 }
486 FILEDESC_UNLOCK(fdp);
487
488done:
489 uio->uio_offset = i * UIO_MX;
490 return (error);
491}
492
493static int
494fdesc_poll(ap)
495 struct vop_poll_args /* {
496 struct vnode *a_vp;
497 int a_events;
498 struct ucred *a_cred;
499 struct thread *a_td;
500 } */ *ap;
501{
502 return seltrue(0, ap->a_events, ap->a_td);
503}
504
505static int
506fdesc_inactive(ap)
507 struct vop_inactive_args /* {
508 struct vnode *a_vp;
509 struct thread *a_td;
510 } */ *ap;
511{
512 struct vnode *vp = ap->a_vp;
513
514 /*
515 * Clear out the v_type field to avoid
516 * nasty things happening in vgone().
517 */
518 VOP_UNLOCK(vp, 0, ap->a_td);
519 vp->v_type = VNON;
520 return (0);
521}
522
523static int
524fdesc_reclaim(ap)
525 struct vop_reclaim_args /* {
526 struct vnode *a_vp;
527 } */ *ap;
528{
529 struct vnode *vp = ap->a_vp;
530 struct fdescnode *fd = VTOFDESC(vp);
531
532 LIST_REMOVE(fd, fd_hash);
533 FREE(vp->v_data, M_TEMP);
534 vp->v_data = 0;
535
536 return (0);
537}
538
539static struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
540 { &vop_default_desc, (vop_t *) vop_defaultop },
541 { &vop_access_desc, (vop_t *) vop_null },
542 { &vop_getattr_desc, (vop_t *) fdesc_getattr },
543 { &vop_inactive_desc, (vop_t *) fdesc_inactive },
544 { &vop_lookup_desc, (vop_t *) fdesc_lookup },
545 { &vop_open_desc, (vop_t *) fdesc_open },
546 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
547 { &vop_poll_desc, (vop_t *) fdesc_poll },
548 { &vop_print_desc, (vop_t *) vop_null },
549 { &vop_readdir_desc, (vop_t *) fdesc_readdir },
550 { &vop_reclaim_desc, (vop_t *) fdesc_reclaim },
551 { &vop_setattr_desc, (vop_t *) fdesc_setattr },
552 { NULL, NULL }
553};
554static struct vnodeopv_desc fdesc_vnodeop_opv_desc =
555 { &fdesc_vnodeop_p, fdesc_vnodeop_entries };
556
557VNODEOP_SET(fdesc_vnodeop_opv_desc);
| 480 if (error)
481 goto done;
482 FILEDESC_LOCK(fdp);
483 i++;
484 fcnt++;
485 }
486 FILEDESC_UNLOCK(fdp);
487
488done:
489 uio->uio_offset = i * UIO_MX;
490 return (error);
491}
492
493static int
494fdesc_poll(ap)
495 struct vop_poll_args /* {
496 struct vnode *a_vp;
497 int a_events;
498 struct ucred *a_cred;
499 struct thread *a_td;
500 } */ *ap;
501{
502 return seltrue(0, ap->a_events, ap->a_td);
503}
504
505static int
506fdesc_inactive(ap)
507 struct vop_inactive_args /* {
508 struct vnode *a_vp;
509 struct thread *a_td;
510 } */ *ap;
511{
512 struct vnode *vp = ap->a_vp;
513
514 /*
515 * Clear out the v_type field to avoid
516 * nasty things happening in vgone().
517 */
518 VOP_UNLOCK(vp, 0, ap->a_td);
519 vp->v_type = VNON;
520 return (0);
521}
522
523static int
524fdesc_reclaim(ap)
525 struct vop_reclaim_args /* {
526 struct vnode *a_vp;
527 } */ *ap;
528{
529 struct vnode *vp = ap->a_vp;
530 struct fdescnode *fd = VTOFDESC(vp);
531
532 LIST_REMOVE(fd, fd_hash);
533 FREE(vp->v_data, M_TEMP);
534 vp->v_data = 0;
535
536 return (0);
537}
538
539static struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
540 { &vop_default_desc, (vop_t *) vop_defaultop },
541 { &vop_access_desc, (vop_t *) vop_null },
542 { &vop_getattr_desc, (vop_t *) fdesc_getattr },
543 { &vop_inactive_desc, (vop_t *) fdesc_inactive },
544 { &vop_lookup_desc, (vop_t *) fdesc_lookup },
545 { &vop_open_desc, (vop_t *) fdesc_open },
546 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
547 { &vop_poll_desc, (vop_t *) fdesc_poll },
548 { &vop_print_desc, (vop_t *) vop_null },
549 { &vop_readdir_desc, (vop_t *) fdesc_readdir },
550 { &vop_reclaim_desc, (vop_t *) fdesc_reclaim },
551 { &vop_setattr_desc, (vop_t *) fdesc_setattr },
552 { NULL, NULL }
553};
554static struct vnodeopv_desc fdesc_vnodeop_opv_desc =
555 { &fdesc_vnodeop_p, fdesc_vnodeop_entries };
556
557VNODEOP_SET(fdesc_vnodeop_opv_desc);
|