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36 * @(#)fdesc_vnops.c 8.9 (Berkeley) 1/21/94
38 * $FreeBSD: src/sys/miscfs/fdesc/fdesc_vnops.c,v 1.47.2.1 2001/10/22 22:49:26 chris Exp $
39 * $DragonFly: src/sys/vfs/fdesc/fdesc_vnops.c,v 1.3 2003/06/23 17:55:43 dillon Exp $
46 #include <sys/param.h>
47 #include <sys/systm.h>
49 #include <sys/dirent.h>
50 #include <sys/filedesc.h>
51 #include <sys/kernel.h> /* boottime */
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>
58 #include <sys/socket.h>
60 #include <sys/vnode.h>
62 #include <miscfs/fdesc/fdesc.h>
65 #define FDL_LOCKED 0x02
66 static int fdcache_lock;
68 static vop_t **fdesc_vnodeop_p;
71 #define FD_NHASH(ix) \
72 (&fdhashtbl[(ix) & fdhash])
73 static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
76 static int fdesc_getattr __P((struct vop_getattr_args *ap));
77 static int fdesc_inactive __P((struct vop_inactive_args *ap));
78 static int fdesc_lookup __P((struct vop_lookup_args *ap));
79 static int fdesc_open __P((struct vop_open_args *ap));
80 static int fdesc_print __P((struct vop_print_args *ap));
81 static int fdesc_readdir __P((struct vop_readdir_args *ap));
82 static int fdesc_reclaim __P((struct vop_reclaim_args *ap));
83 static int fdesc_poll __P((struct vop_poll_args *ap));
84 static int fdesc_setattr __P((struct vop_setattr_args *ap));
87 * Initialise cache headers
94 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
99 fdesc_allocvp(ftype, ix, mp, vpp, p)
106 struct fdhashhead *fc;
107 struct fdescnode *fd;
112 LIST_FOREACH(fd, fc, fd_hash) {
113 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
114 if (vget(fd->fd_vnode, 0, p))
122 * otherwise lock the array while we call getnewvnode
123 * since that can block.
125 if (fdcache_lock & FDL_LOCKED) {
126 fdcache_lock |= FDL_WANT;
127 (void) tsleep((caddr_t) &fdcache_lock, PINOD, "fdalvp", 0);
130 fdcache_lock |= FDL_LOCKED;
133 * Do the MALLOC before the getnewvnode since doing so afterward
134 * might cause a bogus v_data pointer to get dereferenced
135 * elsewhere if MALLOC should block.
137 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
139 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
149 LIST_INSERT_HEAD(fc, fd, fd_hash);
152 fdcache_lock &= ~FDL_LOCKED;
154 if (fdcache_lock & FDL_WANT) {
155 fdcache_lock &= ~FDL_WANT;
156 wakeup((caddr_t) &fdcache_lock);
163 * vp is the current namei directory
164 * ndp is the name to locate in that directory...
168 struct vop_lookup_args /* {
169 struct vnode * a_dvp;
170 struct vnode ** a_vpp;
171 struct componentname * a_cnp;
174 struct vnode **vpp = ap->a_vpp;
175 struct vnode *dvp = ap->a_dvp;
176 struct componentname *cnp = ap->a_cnp;
177 char *pname = cnp->cn_nameptr;
178 struct proc *p = cnp->cn_proc;
179 int nlen = cnp->cn_namelen;
180 int nfiles = p->p_fd->fd_nfiles;
185 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) {
190 VOP_UNLOCK(dvp, 0, p);
191 if (cnp->cn_namelen == 1 && *pname == '.') {
194 vn_lock(dvp, LK_SHARED | LK_RETRY, p);
198 if (VTOFDESC(dvp)->fd_type != Froot) {
204 /* the only time a leading 0 is acceptable is if it's "0" */
205 if (*pname == '0' && nlen != 1) {
210 if (*pname < '0' || *pname > '9') {
214 fd = 10 * fd + *pname++ - '0';
217 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
222 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, p);
225 VTOFDESC(fvp)->fd_fd = fd;
226 vn_lock(fvp, LK_SHARED | LK_RETRY, p);
231 vn_lock(dvp, LK_SHARED | LK_RETRY, p);
238 struct vop_open_args /* {
241 struct ucred *a_cred;
245 struct vnode *vp = ap->a_vp;
247 if (VTOFDESC(vp)->fd_type == Froot)
251 * XXX Kludge: set p->p_dupfd to contain the value of the the file
252 * descriptor being sought for duplication. The error return ensures
253 * that the vnode for this device will be released by vn_open. Open
254 * will detect this special error and take the actions in dupfdopen.
255 * Other callers of vn_open or VOP_OPEN will simply report the
258 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
264 struct vop_getattr_args /* {
267 struct ucred *a_cred;
271 struct vnode *vp = ap->a_vp;
272 struct vattr *vap = ap->a_vap;
273 struct filedesc *fdp = ap->a_p->p_fd;
279 switch (VTOFDESC(vp)->fd_type) {
283 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
286 vap->va_size = DEV_BSIZE;
287 vap->va_fileid = VTOFDESC(vp)->fd_ix;
290 vap->va_blocksize = DEV_BSIZE;
291 vap->va_atime.tv_sec = boottime.tv_sec;
292 vap->va_atime.tv_nsec = 0;
293 vap->va_mtime = vap->va_atime;
294 vap->va_ctime = vap->va_mtime;
302 fd = VTOFDESC(vp)->fd_fd;
304 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL)
307 bzero(&stb, sizeof(stb));
308 error = fo_stat(fp, &stb, ap->a_p);
311 vap->va_type = IFTOVT(stb.st_mode);
312 vap->va_mode = stb.st_mode;
313 #define FDRX (VREAD|VEXEC)
314 if (vap->va_type == VDIR)
315 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
319 vap->va_bytes = stb.st_blocks * stb.st_blksize;
320 vap->va_fileid = VTOFDESC(vp)->fd_ix;
321 vap->va_size = stb.st_size;
322 vap->va_blocksize = stb.st_blksize;
323 vap->va_rdev = stb.st_rdev;
326 * If no time data is provided, use the current time.
328 if (stb.st_atimespec.tv_sec == 0 &&
329 stb.st_atimespec.tv_nsec == 0)
330 nanotime(&stb.st_atimespec);
332 if (stb.st_ctimespec.tv_sec == 0 &&
333 stb.st_ctimespec.tv_nsec == 0)
334 nanotime(&stb.st_ctimespec);
336 if (stb.st_mtimespec.tv_sec == 0 &&
337 stb.st_mtimespec.tv_nsec == 0)
338 nanotime(&stb.st_mtimespec);
340 vap->va_atime = stb.st_atimespec;
341 vap->va_mtime = stb.st_mtimespec;
342 vap->va_ctime = stb.st_ctimespec;
343 vap->va_uid = stb.st_uid;
344 vap->va_gid = stb.st_gid;
349 panic("fdesc_getattr");
354 vp->v_type = vap->va_type;
360 struct vop_setattr_args /* {
363 struct ucred *a_cred;
367 struct vattr *vap = ap->a_vap;
373 * Can't mess with the root vnode
375 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
378 fd = VTOFDESC(ap->a_vp)->fd_fd;
381 * Allow setattr where there is an underlying vnode.
383 error = getvnode(ap->a_p->p_fd, fd, &fp);
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.
390 if (error == EINVAL) {
391 if (vap->va_flags != VNOVAL)
405 struct vop_readdir_args /* {
408 struct ucred *a_cred;
414 struct uio *uio = ap->a_uio;
415 struct filedesc *fdp;
417 struct dirent *dp = &d;
418 int error, i, off, fcnt;
421 * We don't allow exporting fdesc mounts, and currently local
422 * requests do not need cookies.
425 panic("fdesc_readdir: not hungry");
427 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
428 panic("fdesc_readdir: not dir");
430 off = (int)uio->uio_offset;
431 if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
432 uio->uio_resid < UIO_MX)
434 i = (u_int)off / UIO_MX;
435 fdp = uio->uio_procp->p_fd;
438 fcnt = i - 2; /* The first two nodes are `.' and `..' */
440 while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
444 bzero((caddr_t)dp, UIO_MX);
446 dp->d_fileno = i + FD_ROOT;
447 dp->d_namlen = i + 1;
448 dp->d_reclen = UIO_MX;
449 bcopy("..", dp->d_name, dp->d_namlen);
450 dp->d_name[i + 1] = '\0';
454 if (fdp->fd_ofiles[fcnt] == NULL)
457 bzero((caddr_t) dp, UIO_MX);
458 dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
459 dp->d_reclen = UIO_MX;
460 dp->d_type = DT_UNKNOWN;
461 dp->d_fileno = i + FD_DESC;
465 * And ship to userland
467 error = uiomove((caddr_t) dp, UIO_MX, uio);
475 uio->uio_offset = i * UIO_MX;
481 struct vop_poll_args /* {
484 struct ucred *a_cred;
488 return seltrue(0, ap->a_events, ap->a_p->p_thread);
493 struct vop_inactive_args /* {
498 struct vnode *vp = ap->a_vp;
501 * Clear out the v_type field to avoid
502 * nasty things happening in vgone().
504 VOP_UNLOCK(vp, 0, ap->a_p);
511 struct vop_reclaim_args /* {
515 struct vnode *vp = ap->a_vp;
516 struct fdescnode *fd = VTOFDESC(vp);
518 LIST_REMOVE(fd, fd_hash);
519 FREE(vp->v_data, M_TEMP);
526 * Print out the contents of a /dev/fd vnode.
531 struct vop_print_args /* {
536 printf("tag VT_NON, fdesc vnode\n");
540 static struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
541 { &vop_default_desc, (vop_t *) vop_defaultop },
542 { &vop_access_desc, (vop_t *) vop_null },
543 { &vop_getattr_desc, (vop_t *) fdesc_getattr },
544 { &vop_inactive_desc, (vop_t *) fdesc_inactive },
545 { &vop_lookup_desc, (vop_t *) fdesc_lookup },
546 { &vop_open_desc, (vop_t *) fdesc_open },
547 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
548 { &vop_poll_desc, (vop_t *) fdesc_poll },
549 { &vop_print_desc, (vop_t *) fdesc_print },
550 { &vop_readdir_desc, (vop_t *) fdesc_readdir },
551 { &vop_reclaim_desc, (vop_t *) fdesc_reclaim },
552 { &vop_setattr_desc, (vop_t *) fdesc_setattr },
555 static struct vnodeopv_desc fdesc_vnodeop_opv_desc =
556 { &fdesc_vnodeop_p, fdesc_vnodeop_entries };
558 VNODEOP_SET(fdesc_vnodeop_opv_desc);