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 1.14 2004/08/28 19:02:10 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;
70 #define FD_NHASH(ix) \
71 (&fdhashtbl[(ix) & fdhash])
72 static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
75 static int fdesc_getattr (struct vop_getattr_args *ap);
76 static int fdesc_inactive (struct vop_inactive_args *ap);
77 static int fdesc_lookup (struct vop_lookup_args *ap);
78 static int fdesc_open (struct vop_open_args *ap);
79 static int fdesc_print (struct vop_print_args *ap);
80 static int fdesc_readdir (struct vop_readdir_args *ap);
81 static int fdesc_reclaim (struct vop_reclaim_args *ap);
82 static int fdesc_poll (struct vop_poll_args *ap);
83 static int fdesc_setattr (struct vop_setattr_args *ap);
86 * Initialise cache headers
89 fdesc_init(struct vfsconf *vfsp)
92 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
97 fdesc_allocvp(fdntype ftype, int ix, struct mount *mp, struct vnode **vpp,
100 struct fdhashhead *fc;
101 struct fdescnode *fd;
106 LIST_FOREACH(fd, fc, fd_hash) {
107 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
108 if (vget(fd->fd_vnode, NULL, 0, td))
116 * otherwise lock the array while we call getnewvnode
117 * since that can block.
119 if (fdcache_lock & FDL_LOCKED) {
120 fdcache_lock |= FDL_WANT;
121 (void) tsleep((caddr_t) &fdcache_lock, 0, "fdalvp", 0);
124 fdcache_lock |= FDL_LOCKED;
127 * Do the MALLOC before the getnewvnode since doing so afterward
128 * might cause a bogus v_data pointer to get dereferenced
129 * elsewhere if MALLOC should block.
131 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
133 error = getnewvnode(VT_FDESC, mp, mp->mnt_vn_ops, vpp, 0, 0);
143 LIST_INSERT_HEAD(fc, fd, fd_hash);
146 fdcache_lock &= ~FDL_LOCKED;
148 if (fdcache_lock & FDL_WANT) {
149 fdcache_lock &= ~FDL_WANT;
150 wakeup((caddr_t) &fdcache_lock);
157 * vp is the current namei directory
158 * ndp is the name to locate in that directory...
160 * fdesc_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
161 * struct componentname *a_cnp)
164 fdesc_lookup(struct vop_lookup_args *ap)
166 struct componentname *cnp = ap->a_cnp;
167 struct thread *td = cnp->cn_td;
168 struct proc *p = td->td_proc;
169 struct vnode **vpp = ap->a_vpp;
170 struct vnode *dvp = ap->a_dvp;
171 char *pname = cnp->cn_nameptr;
172 int nlen = cnp->cn_namelen;
179 nfiles = p->p_fd->fd_nfiles;
180 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME) {
185 VOP_UNLOCK(dvp, NULL, 0, td);
186 if (cnp->cn_namelen == 1 && *pname == '.') {
189 vn_lock(dvp, NULL, LK_SHARED | LK_RETRY, td);
193 if (VTOFDESC(dvp)->fd_type != Froot) {
199 /* the only time a leading 0 is acceptable is if it's "0" */
200 if (*pname == '0' && nlen != 1) {
205 if (*pname < '0' || *pname > '9') {
209 fd = 10 * fd + *pname++ - '0';
212 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
217 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, td);
220 VTOFDESC(fvp)->fd_fd = fd;
221 vn_lock(fvp, NULL, LK_SHARED | LK_RETRY, td);
226 vn_lock(dvp, NULL, LK_SHARED | LK_RETRY, td);
232 * fdesc_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
233 * struct thread *a_td)
236 fdesc_open(struct vop_open_args *ap)
238 struct vnode *vp = ap->a_vp;
239 struct proc *p = ap->a_td->td_proc;
243 if (VTOFDESC(vp)->fd_type == Froot)
247 * XXX Kludge: set p->p_dupfd to contain the value of the the file
248 * descriptor being sought for duplication. The error return ensures
249 * that the vnode for this device will be released by vn_open. Open
250 * will detect this special error and take the actions in dupfdopen.
251 * Other callers of vn_open or VOP_OPEN will simply report the
254 p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
259 * fdesc_getattr(struct vnode *a_vp, struct vattr *a_vap,
260 * struct ucred *a_cred, struct thread *a_td)
263 fdesc_getattr(struct vop_getattr_args *ap)
265 struct proc *p = ap->a_td->td_proc;
266 struct vnode *vp = ap->a_vp;
267 struct vattr *vap = ap->a_vap;
268 struct filedesc *fdp;
276 switch (VTOFDESC(vp)->fd_type) {
280 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
283 vap->va_size = DEV_BSIZE;
284 vap->va_fileid = VTOFDESC(vp)->fd_ix;
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;
299 fd = VTOFDESC(vp)->fd_fd;
301 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL)
304 bzero(&stb, sizeof(stb));
305 error = fo_stat(fp, &stb, ap->a_td);
308 vap->va_type = IFTOVT(stb.st_mode);
309 vap->va_mode = stb.st_mode;
310 #define FDRX (VREAD|VEXEC)
311 if (vap->va_type == VDIR)
312 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
316 vap->va_bytes = stb.st_blocks * stb.st_blksize;
317 vap->va_fileid = VTOFDESC(vp)->fd_ix;
318 vap->va_size = stb.st_size;
319 vap->va_blocksize = stb.st_blksize;
320 vap->va_rdev = stb.st_rdev;
323 * If no time data is provided, use the current time.
325 if (stb.st_atimespec.tv_sec == 0 &&
326 stb.st_atimespec.tv_nsec == 0)
327 nanotime(&stb.st_atimespec);
329 if (stb.st_ctimespec.tv_sec == 0 &&
330 stb.st_ctimespec.tv_nsec == 0)
331 nanotime(&stb.st_ctimespec);
333 if (stb.st_mtimespec.tv_sec == 0 &&
334 stb.st_mtimespec.tv_nsec == 0)
335 nanotime(&stb.st_mtimespec);
337 vap->va_atime = stb.st_atimespec;
338 vap->va_mtime = stb.st_mtimespec;
339 vap->va_ctime = stb.st_ctimespec;
340 vap->va_uid = stb.st_uid;
341 vap->va_gid = stb.st_gid;
346 panic("fdesc_getattr");
351 vp->v_type = vap->va_type;
356 * fdesc_setattr(struct vnode *a_vp, struct vattr *a_vap,
357 * struct ucred *a_cred, struct thread *a_td)
360 fdesc_setattr(struct vop_setattr_args *ap)
362 struct proc *p = ap->a_td->td_proc;
363 struct vattr *vap = ap->a_vap;
369 * Can't mess with the root vnode
371 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
374 fd = VTOFDESC(ap->a_vp)->fd_fd;
378 * Allow setattr where there is an underlying vnode.
380 error = getvnode(p->p_fd, fd, &fp);
383 * getvnode() returns EINVAL if the file descriptor is not
384 * backed by a vnode. Silently drop all changes except
385 * chflags(2) in this case.
387 if (error == EINVAL) {
388 if (vap->va_flags != VNOVAL)
401 * fdesc_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
402 * int *a_eofflag, u_long *a_cookies, int a_ncookies)
405 fdesc_readdir(struct vop_readdir_args *ap)
407 struct uio *uio = ap->a_uio;
408 struct filedesc *fdp;
410 struct dirent *dp = &d;
411 int error, i, off, fcnt;
414 * We don't allow exporting fdesc mounts, and currently local
415 * requests do not need cookies.
418 panic("fdesc_readdir: not hungry");
420 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
421 panic("fdesc_readdir: not dir");
423 off = (int)uio->uio_offset;
424 if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
425 uio->uio_resid < UIO_MX)
427 i = (u_int)off / UIO_MX;
428 KKASSERT(uio->uio_td->td_proc);
429 fdp = uio->uio_td->td_proc->p_fd;
432 fcnt = i - 2; /* The first two nodes are `.' and `..' */
434 while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
438 bzero((caddr_t)dp, UIO_MX);
440 dp->d_fileno = i + FD_ROOT;
441 dp->d_namlen = i + 1;
442 dp->d_reclen = UIO_MX;
443 bcopy("..", dp->d_name, dp->d_namlen);
444 dp->d_name[i + 1] = '\0';
448 if (fdp->fd_ofiles[fcnt] == NULL)
451 bzero((caddr_t) dp, UIO_MX);
452 dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
453 dp->d_reclen = UIO_MX;
454 dp->d_type = DT_UNKNOWN;
455 dp->d_fileno = i + FD_DESC;
459 * And ship to userland
461 error = uiomove((caddr_t) dp, UIO_MX, uio);
469 uio->uio_offset = i * UIO_MX;
474 * fdesc_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred,
475 * struct thread *a_td)
478 fdesc_poll(struct vop_poll_args *ap)
480 return seltrue(0, ap->a_events, ap->a_td);
484 * fdesc_inactive(struct vnode *a_vp, struct thread *a_td)
487 fdesc_inactive(struct vop_inactive_args *ap)
489 struct vnode *vp = ap->a_vp;
492 * Clear out the v_type field to avoid
493 * nasty things happening in vgone().
495 VOP_UNLOCK(vp, NULL, 0, ap->a_td);
501 * fdesc_reclaim(struct vnode *a_vp)
504 fdesc_reclaim(struct vop_reclaim_args *ap)
506 struct vnode *vp = ap->a_vp;
507 struct fdescnode *fd = VTOFDESC(vp);
509 LIST_REMOVE(fd, fd_hash);
510 FREE(vp->v_data, M_TEMP);
517 * Print out the contents of a /dev/fd vnode.
519 * fdesc_print(struct vnode *a_vp)
523 fdesc_print(struct vop_print_args *ap)
525 printf("tag VT_NON, fdesc vnode\n");
529 struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
530 { &vop_default_desc, (void *) vop_defaultop },
531 { &vop_access_desc, (void *) vop_null },
532 { &vop_getattr_desc, (void *) fdesc_getattr },
533 { &vop_inactive_desc, (void *) fdesc_inactive },
534 { &vop_lookup_desc, (void *) fdesc_lookup },
535 { &vop_open_desc, (void *) fdesc_open },
536 { &vop_pathconf_desc, (void *) vop_stdpathconf },
537 { &vop_poll_desc, (void *) fdesc_poll },
538 { &vop_print_desc, (void *) fdesc_print },
539 { &vop_readdir_desc, (void *) fdesc_readdir },
540 { &vop_reclaim_desc, (void *) fdesc_reclaim },
541 { &vop_setattr_desc, (void *) fdesc_setattr },