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 $
39 * $DragonFly: src/sys/vfs/fdesc/fdesc_vnops.c,v 1.6 2003/08/07 21:17:40 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>
57 #include <sys/namei.h>
58 #include <sys/socket.h>
60 #include <sys/vnode.h>
61 #include <sys/file2.h>
66 #define FDL_LOCKED 0x02
67 static int fdcache_lock;
69 static vop_t **fdesc_vnodeop_p;
72 #define FD_NHASH(ix) \
73 (&fdhashtbl[(ix) & fdhash])
74 static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
77 static int fdesc_getattr __P((struct vop_getattr_args *ap));
78 static int fdesc_inactive __P((struct vop_inactive_args *ap));
79 static int fdesc_lookup __P((struct vop_lookup_args *ap));
80 static int fdesc_open __P((struct vop_open_args *ap));
81 static int fdesc_print __P((struct vop_print_args *ap));
82 static int fdesc_readdir __P((struct vop_readdir_args *ap));
83 static int fdesc_reclaim __P((struct vop_reclaim_args *ap));
84 static int fdesc_poll __P((struct vop_poll_args *ap));
85 static int fdesc_setattr __P((struct vop_setattr_args *ap));
88 * Initialise cache headers
95 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
100 fdesc_allocvp(ftype, ix, mp, vpp, td)
107 struct fdhashhead *fc;
108 struct fdescnode *fd;
113 LIST_FOREACH(fd, fc, fd_hash) {
114 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
115 if (vget(fd->fd_vnode, 0, td))
123 * otherwise lock the array while we call getnewvnode
124 * since that can block.
126 if (fdcache_lock & FDL_LOCKED) {
127 fdcache_lock |= FDL_WANT;
128 (void) tsleep((caddr_t) &fdcache_lock, 0, "fdalvp", 0);
131 fdcache_lock |= FDL_LOCKED;
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.
138 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
140 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
150 LIST_INSERT_HEAD(fc, fd, fd_hash);
153 fdcache_lock &= ~FDL_LOCKED;
155 if (fdcache_lock & FDL_WANT) {
156 fdcache_lock &= ~FDL_WANT;
157 wakeup((caddr_t) &fdcache_lock);
164 * vp is the current namei directory
165 * ndp is the name to locate in that directory...
169 struct vop_lookup_args /* {
170 struct vnode * a_dvp;
171 struct vnode ** a_vpp;
172 struct componentname * a_cnp;
175 struct componentname *cnp = ap->a_cnp;
176 struct thread *td = cnp->cn_td;
177 struct proc *p = td->td_proc;
178 struct vnode **vpp = ap->a_vpp;
179 struct vnode *dvp = ap->a_dvp;
180 char *pname = cnp->cn_nameptr;
181 int nlen = cnp->cn_namelen;
188 nfiles = p->p_fd->fd_nfiles;
189 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) {
194 VOP_UNLOCK(dvp, 0, td);
195 if (cnp->cn_namelen == 1 && *pname == '.') {
198 vn_lock(dvp, LK_SHARED | LK_RETRY, td);
202 if (VTOFDESC(dvp)->fd_type != Froot) {
208 /* the only time a leading 0 is acceptable is if it's "0" */
209 if (*pname == '0' && nlen != 1) {
214 if (*pname < '0' || *pname > '9') {
218 fd = 10 * fd + *pname++ - '0';
221 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
226 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, td);
229 VTOFDESC(fvp)->fd_fd = fd;
230 vn_lock(fvp, LK_SHARED | LK_RETRY, td);
235 vn_lock(dvp, LK_SHARED | LK_RETRY, td);
242 struct vop_open_args /* {
245 struct ucred *a_cred;
249 struct vnode *vp = ap->a_vp;
250 struct proc *p = ap->a_td->td_proc;
254 if (VTOFDESC(vp)->fd_type == Froot)
258 * XXX Kludge: set p->p_dupfd to contain the value of the the file
259 * descriptor being sought for duplication. The error return ensures
260 * that the vnode for this device will be released by vn_open. Open
261 * will detect this special error and take the actions in dupfdopen.
262 * Other callers of vn_open or VOP_OPEN will simply report the
265 p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
271 struct vop_getattr_args /* {
274 struct ucred *a_cred;
278 struct proc *p = ap->a_td->td_proc;
279 struct vnode *vp = ap->a_vp;
280 struct vattr *vap = ap->a_vap;
281 struct filedesc *fdp;
289 switch (VTOFDESC(vp)->fd_type) {
293 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
296 vap->va_size = DEV_BSIZE;
297 vap->va_fileid = VTOFDESC(vp)->fd_ix;
300 vap->va_blocksize = DEV_BSIZE;
301 vap->va_atime.tv_sec = boottime.tv_sec;
302 vap->va_atime.tv_nsec = 0;
303 vap->va_mtime = vap->va_atime;
304 vap->va_ctime = vap->va_mtime;
312 fd = VTOFDESC(vp)->fd_fd;
314 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL)
317 bzero(&stb, sizeof(stb));
318 error = fo_stat(fp, &stb, ap->a_td);
321 vap->va_type = IFTOVT(stb.st_mode);
322 vap->va_mode = stb.st_mode;
323 #define FDRX (VREAD|VEXEC)
324 if (vap->va_type == VDIR)
325 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
329 vap->va_bytes = stb.st_blocks * stb.st_blksize;
330 vap->va_fileid = VTOFDESC(vp)->fd_ix;
331 vap->va_size = stb.st_size;
332 vap->va_blocksize = stb.st_blksize;
333 vap->va_rdev = stb.st_rdev;
336 * If no time data is provided, use the current time.
338 if (stb.st_atimespec.tv_sec == 0 &&
339 stb.st_atimespec.tv_nsec == 0)
340 nanotime(&stb.st_atimespec);
342 if (stb.st_ctimespec.tv_sec == 0 &&
343 stb.st_ctimespec.tv_nsec == 0)
344 nanotime(&stb.st_ctimespec);
346 if (stb.st_mtimespec.tv_sec == 0 &&
347 stb.st_mtimespec.tv_nsec == 0)
348 nanotime(&stb.st_mtimespec);
350 vap->va_atime = stb.st_atimespec;
351 vap->va_mtime = stb.st_mtimespec;
352 vap->va_ctime = stb.st_ctimespec;
353 vap->va_uid = stb.st_uid;
354 vap->va_gid = stb.st_gid;
359 panic("fdesc_getattr");
364 vp->v_type = vap->va_type;
370 struct vop_setattr_args /* {
373 struct ucred *a_cred;
377 struct proc *p = ap->a_td->td_proc;
378 struct vattr *vap = ap->a_vap;
384 * Can't mess with the root vnode
386 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
389 fd = VTOFDESC(ap->a_vp)->fd_fd;
393 * Allow setattr where there is an underlying vnode.
395 error = getvnode(p->p_fd, fd, &fp);
398 * getvnode() returns EINVAL if the file descriptor is not
399 * backed by a vnode. Silently drop all changes except
400 * chflags(2) in this case.
402 if (error == EINVAL) {
403 if (vap->va_flags != VNOVAL)
417 struct vop_readdir_args /* {
420 struct ucred *a_cred;
426 struct uio *uio = ap->a_uio;
427 struct filedesc *fdp;
429 struct dirent *dp = &d;
430 int error, i, off, fcnt;
433 * We don't allow exporting fdesc mounts, and currently local
434 * requests do not need cookies.
437 panic("fdesc_readdir: not hungry");
439 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
440 panic("fdesc_readdir: not dir");
442 off = (int)uio->uio_offset;
443 if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
444 uio->uio_resid < UIO_MX)
446 i = (u_int)off / UIO_MX;
447 KKASSERT(uio->uio_td->td_proc);
448 fdp = uio->uio_td->td_proc->p_fd;
451 fcnt = i - 2; /* The first two nodes are `.' and `..' */
453 while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
457 bzero((caddr_t)dp, UIO_MX);
459 dp->d_fileno = i + FD_ROOT;
460 dp->d_namlen = i + 1;
461 dp->d_reclen = UIO_MX;
462 bcopy("..", dp->d_name, dp->d_namlen);
463 dp->d_name[i + 1] = '\0';
467 if (fdp->fd_ofiles[fcnt] == NULL)
470 bzero((caddr_t) dp, UIO_MX);
471 dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
472 dp->d_reclen = UIO_MX;
473 dp->d_type = DT_UNKNOWN;
474 dp->d_fileno = i + FD_DESC;
478 * And ship to userland
480 error = uiomove((caddr_t) dp, UIO_MX, uio);
488 uio->uio_offset = i * UIO_MX;
494 struct vop_poll_args /* {
497 struct ucred *a_cred;
501 return seltrue(0, ap->a_events, ap->a_td);
506 struct vop_inactive_args /* {
511 struct vnode *vp = ap->a_vp;
514 * Clear out the v_type field to avoid
515 * nasty things happening in vgone().
517 VOP_UNLOCK(vp, 0, ap->a_td);
524 struct vop_reclaim_args /* {
528 struct vnode *vp = ap->a_vp;
529 struct fdescnode *fd = VTOFDESC(vp);
531 LIST_REMOVE(fd, fd_hash);
532 FREE(vp->v_data, M_TEMP);
539 * Print out the contents of a /dev/fd vnode.
544 struct vop_print_args /* {
549 printf("tag VT_NON, fdesc vnode\n");
553 static struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
554 { &vop_default_desc, (vop_t *) vop_defaultop },
555 { &vop_access_desc, (vop_t *) vop_null },
556 { &vop_getattr_desc, (vop_t *) fdesc_getattr },
557 { &vop_inactive_desc, (vop_t *) fdesc_inactive },
558 { &vop_lookup_desc, (vop_t *) fdesc_lookup },
559 { &vop_open_desc, (vop_t *) fdesc_open },
560 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
561 { &vop_poll_desc, (vop_t *) fdesc_poll },
562 { &vop_print_desc, (vop_t *) fdesc_print },
563 { &vop_readdir_desc, (vop_t *) fdesc_readdir },
564 { &vop_reclaim_desc, (vop_t *) fdesc_reclaim },
565 { &vop_setattr_desc, (vop_t *) fdesc_setattr },
568 static struct vnodeopv_desc fdesc_vnodeop_opv_desc =
569 { &fdesc_vnodeop_p, fdesc_vnodeop_entries };
571 VNODEOP_SET(fdesc_vnodeop_opv_desc);