2 * Copyright (c) 1992, 1993
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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 $
45 #include <sys/param.h>
46 #include <sys/systm.h>
48 #include <sys/dirent.h>
49 #include <sys/filedesc.h>
50 #include <sys/kernel.h> /* boottime */
52 #include <sys/malloc.h>
53 #include <sys/file.h> /* Must come after sys/malloc.h */
54 #include <sys/mount.h>
55 #include <sys/namei.h>
57 #include <sys/socket.h>
59 #include <sys/vnode.h>
61 #include <miscfs/fdesc/fdesc.h>
64 #define FDL_LOCKED 0x02
65 static int fdcache_lock;
67 static vop_t **fdesc_vnodeop_p;
70 #define FD_NHASH(ix) \
71 (&fdhashtbl[(ix) & fdhash])
72 static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
75 static int fdesc_getattr __P((struct vop_getattr_args *ap));
76 static int fdesc_inactive __P((struct vop_inactive_args *ap));
77 static int fdesc_lookup __P((struct vop_lookup_args *ap));
78 static int fdesc_open __P((struct vop_open_args *ap));
79 static int fdesc_print __P((struct vop_print_args *ap));
80 static int fdesc_readdir __P((struct vop_readdir_args *ap));
81 static int fdesc_reclaim __P((struct vop_reclaim_args *ap));
82 static int fdesc_poll __P((struct vop_poll_args *ap));
83 static int fdesc_setattr __P((struct vop_setattr_args *ap));
86 * Initialise cache headers
93 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
98 fdesc_allocvp(ftype, ix, mp, vpp, p)
105 struct fdhashhead *fc;
106 struct fdescnode *fd;
111 LIST_FOREACH(fd, fc, fd_hash) {
112 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
113 if (vget(fd->fd_vnode, 0, p))
121 * otherwise lock the array while we call getnewvnode
122 * since that can block.
124 if (fdcache_lock & FDL_LOCKED) {
125 fdcache_lock |= FDL_WANT;
126 (void) tsleep((caddr_t) &fdcache_lock, PINOD, "fdalvp", 0);
129 fdcache_lock |= FDL_LOCKED;
132 * Do the MALLOC before the getnewvnode since doing so afterward
133 * might cause a bogus v_data pointer to get dereferenced
134 * elsewhere if MALLOC should block.
136 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
138 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
148 LIST_INSERT_HEAD(fc, fd, fd_hash);
151 fdcache_lock &= ~FDL_LOCKED;
153 if (fdcache_lock & FDL_WANT) {
154 fdcache_lock &= ~FDL_WANT;
155 wakeup((caddr_t) &fdcache_lock);
162 * vp is the current namei directory
163 * ndp is the name to locate in that directory...
167 struct vop_lookup_args /* {
168 struct vnode * a_dvp;
169 struct vnode ** a_vpp;
170 struct componentname * a_cnp;
173 struct vnode **vpp = ap->a_vpp;
174 struct vnode *dvp = ap->a_dvp;
175 struct componentname *cnp = ap->a_cnp;
176 char *pname = cnp->cn_nameptr;
177 struct proc *p = cnp->cn_proc;
178 int nlen = cnp->cn_namelen;
179 int nfiles = p->p_fd->fd_nfiles;
184 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) {
189 VOP_UNLOCK(dvp, 0, p);
190 if (cnp->cn_namelen == 1 && *pname == '.') {
193 vn_lock(dvp, LK_SHARED | LK_RETRY, p);
197 if (VTOFDESC(dvp)->fd_type != Froot) {
203 /* the only time a leading 0 is acceptable is if it's "0" */
204 if (*pname == '0' && nlen != 1) {
209 if (*pname < '0' || *pname > '9') {
213 fd = 10 * fd + *pname++ - '0';
216 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
221 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, p);
224 VTOFDESC(fvp)->fd_fd = fd;
225 vn_lock(fvp, LK_SHARED | LK_RETRY, p);
230 vn_lock(dvp, LK_SHARED | LK_RETRY, p);
237 struct vop_open_args /* {
240 struct ucred *a_cred;
244 struct vnode *vp = ap->a_vp;
246 if (VTOFDESC(vp)->fd_type == Froot)
250 * XXX Kludge: set p->p_dupfd to contain the value of the the file
251 * descriptor being sought for duplication. The error return ensures
252 * that the vnode for this device will be released by vn_open. Open
253 * will detect this special error and take the actions in dupfdopen.
254 * Other callers of vn_open or VOP_OPEN will simply report the
257 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
263 struct vop_getattr_args /* {
266 struct ucred *a_cred;
270 struct vnode *vp = ap->a_vp;
271 struct vattr *vap = ap->a_vap;
272 struct filedesc *fdp = ap->a_p->p_fd;
278 switch (VTOFDESC(vp)->fd_type) {
282 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
285 vap->va_size = DEV_BSIZE;
286 vap->va_fileid = VTOFDESC(vp)->fd_ix;
289 vap->va_blocksize = DEV_BSIZE;
290 vap->va_atime.tv_sec = boottime.tv_sec;
291 vap->va_atime.tv_nsec = 0;
292 vap->va_mtime = vap->va_atime;
293 vap->va_ctime = vap->va_mtime;
301 fd = VTOFDESC(vp)->fd_fd;
303 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL)
306 bzero(&stb, sizeof(stb));
307 error = fo_stat(fp, &stb, ap->a_p);
310 vap->va_type = IFTOVT(stb.st_mode);
311 vap->va_mode = stb.st_mode;
312 #define FDRX (VREAD|VEXEC)
313 if (vap->va_type == VDIR)
314 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
318 vap->va_bytes = stb.st_blocks * stb.st_blksize;
319 vap->va_fileid = VTOFDESC(vp)->fd_ix;
320 vap->va_size = stb.st_size;
321 vap->va_blocksize = stb.st_blksize;
322 vap->va_rdev = stb.st_rdev;
325 * If no time data is provided, use the current time.
327 if (stb.st_atimespec.tv_sec == 0 &&
328 stb.st_atimespec.tv_nsec == 0)
329 nanotime(&stb.st_atimespec);
331 if (stb.st_ctimespec.tv_sec == 0 &&
332 stb.st_ctimespec.tv_nsec == 0)
333 nanotime(&stb.st_ctimespec);
335 if (stb.st_mtimespec.tv_sec == 0 &&
336 stb.st_mtimespec.tv_nsec == 0)
337 nanotime(&stb.st_mtimespec);
339 vap->va_atime = stb.st_atimespec;
340 vap->va_mtime = stb.st_mtimespec;
341 vap->va_ctime = stb.st_ctimespec;
342 vap->va_uid = stb.st_uid;
343 vap->va_gid = stb.st_gid;
348 panic("fdesc_getattr");
353 vp->v_type = vap->va_type;
359 struct vop_setattr_args /* {
362 struct ucred *a_cred;
366 struct vattr *vap = ap->a_vap;
372 * Can't mess with the root vnode
374 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
377 fd = VTOFDESC(ap->a_vp)->fd_fd;
380 * Allow setattr where there is an underlying vnode.
382 error = getvnode(ap->a_p->p_fd, fd, &fp);
385 * getvnode() returns EINVAL if the file descriptor is not
386 * backed by a vnode. Silently drop all changes except
387 * chflags(2) in this case.
389 if (error == EINVAL) {
390 if (vap->va_flags != VNOVAL)
404 struct vop_readdir_args /* {
407 struct ucred *a_cred;
413 struct uio *uio = ap->a_uio;
414 struct filedesc *fdp;
416 struct dirent *dp = &d;
417 int error, i, off, fcnt;
420 * We don't allow exporting fdesc mounts, and currently local
421 * requests do not need cookies.
424 panic("fdesc_readdir: not hungry");
426 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
427 panic("fdesc_readdir: not dir");
429 off = (int)uio->uio_offset;
430 if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
431 uio->uio_resid < UIO_MX)
433 i = (u_int)off / UIO_MX;
434 fdp = uio->uio_procp->p_fd;
437 fcnt = i - 2; /* The first two nodes are `.' and `..' */
439 while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
443 bzero((caddr_t)dp, UIO_MX);
445 dp->d_fileno = i + FD_ROOT;
446 dp->d_namlen = i + 1;
447 dp->d_reclen = UIO_MX;
448 bcopy("..", dp->d_name, dp->d_namlen);
449 dp->d_name[i + 1] = '\0';
453 if (fdp->fd_ofiles[fcnt] == NULL)
456 bzero((caddr_t) dp, UIO_MX);
457 dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
458 dp->d_reclen = UIO_MX;
459 dp->d_type = DT_UNKNOWN;
460 dp->d_fileno = i + FD_DESC;
464 * And ship to userland
466 error = uiomove((caddr_t) dp, UIO_MX, uio);
474 uio->uio_offset = i * UIO_MX;
480 struct vop_poll_args /* {
483 struct ucred *a_cred;
487 return seltrue(0, ap->a_events, ap->a_p);
492 struct vop_inactive_args /* {
497 struct vnode *vp = ap->a_vp;
500 * Clear out the v_type field to avoid
501 * nasty things happening in vgone().
503 VOP_UNLOCK(vp, 0, ap->a_p);
510 struct vop_reclaim_args /* {
514 struct vnode *vp = ap->a_vp;
515 struct fdescnode *fd = VTOFDESC(vp);
517 LIST_REMOVE(fd, fd_hash);
518 FREE(vp->v_data, M_TEMP);
525 * Print out the contents of a /dev/fd vnode.
530 struct vop_print_args /* {
535 printf("tag VT_NON, fdesc vnode\n");
539 static 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 *) fdesc_print },
549 { &vop_readdir_desc, (vop_t *) fdesc_readdir },
550 { &vop_reclaim_desc, (vop_t *) fdesc_reclaim },
551 { &vop_setattr_desc, (vop_t *) fdesc_setattr },
554 static struct vnodeopv_desc fdesc_vnodeop_opv_desc =
555 { &fdesc_vnodeop_p, fdesc_vnodeop_entries };
557 VNODEOP_SET(fdesc_vnodeop_opv_desc);