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 1.10 2004/04/01 19:08:15 cpressey 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 (struct vop_getattr_args *ap);
78 static int fdesc_inactive (struct vop_inactive_args *ap);
79 static int fdesc_lookup (struct vop_lookup_args *ap);
80 static int fdesc_open (struct vop_open_args *ap);
81 static int fdesc_print (struct vop_print_args *ap);
82 static int fdesc_readdir (struct vop_readdir_args *ap);
83 static int fdesc_reclaim (struct vop_reclaim_args *ap);
84 static int fdesc_poll (struct vop_poll_args *ap);
85 static int fdesc_setattr (struct vop_setattr_args *ap);
88 * Initialise cache headers
91 fdesc_init(struct vfsconf *vfsp)
94 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
99 fdesc_allocvp(fdntype ftype, int ix, struct mount *mp, struct vnode **vpp,
102 struct fdhashhead *fc;
103 struct fdescnode *fd;
108 LIST_FOREACH(fd, fc, fd_hash) {
109 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
110 if (vget(fd->fd_vnode, NULL, 0, td))
118 * otherwise lock the array while we call getnewvnode
119 * since that can block.
121 if (fdcache_lock & FDL_LOCKED) {
122 fdcache_lock |= FDL_WANT;
123 (void) tsleep((caddr_t) &fdcache_lock, 0, "fdalvp", 0);
126 fdcache_lock |= FDL_LOCKED;
129 * Do the MALLOC before the getnewvnode since doing so afterward
130 * might cause a bogus v_data pointer to get dereferenced
131 * elsewhere if MALLOC should block.
133 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
135 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
145 LIST_INSERT_HEAD(fc, fd, fd_hash);
148 fdcache_lock &= ~FDL_LOCKED;
150 if (fdcache_lock & FDL_WANT) {
151 fdcache_lock &= ~FDL_WANT;
152 wakeup((caddr_t) &fdcache_lock);
159 * vp is the current namei directory
160 * ndp is the name to locate in that directory...
162 * fdesc_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
163 * struct componentname *a_cnp)
166 fdesc_lookup(struct vop_lookup_args *ap)
168 struct componentname *cnp = ap->a_cnp;
169 struct thread *td = cnp->cn_td;
170 struct proc *p = td->td_proc;
171 struct vnode **vpp = ap->a_vpp;
172 struct vnode *dvp = ap->a_dvp;
173 char *pname = cnp->cn_nameptr;
174 int nlen = cnp->cn_namelen;
181 nfiles = p->p_fd->fd_nfiles;
182 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME) {
187 VOP_UNLOCK(dvp, NULL, 0, td);
188 if (cnp->cn_namelen == 1 && *pname == '.') {
191 vn_lock(dvp, NULL, LK_SHARED | LK_RETRY, td);
195 if (VTOFDESC(dvp)->fd_type != Froot) {
201 /* the only time a leading 0 is acceptable is if it's "0" */
202 if (*pname == '0' && nlen != 1) {
207 if (*pname < '0' || *pname > '9') {
211 fd = 10 * fd + *pname++ - '0';
214 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
219 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, td);
222 VTOFDESC(fvp)->fd_fd = fd;
223 vn_lock(fvp, NULL, LK_SHARED | LK_RETRY, td);
228 vn_lock(dvp, NULL, LK_SHARED | LK_RETRY, td);
234 * fdesc_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
235 * struct thread *a_td)
238 fdesc_open(struct vop_open_args *ap)
240 struct vnode *vp = ap->a_vp;
241 struct proc *p = ap->a_td->td_proc;
245 if (VTOFDESC(vp)->fd_type == Froot)
249 * XXX Kludge: set p->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
256 p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
261 * fdesc_getattr(struct vnode *a_vp, struct vattr *a_vap,
262 * struct ucred *a_cred, struct thread *a_td)
265 fdesc_getattr(struct vop_getattr_args *ap)
267 struct proc *p = ap->a_td->td_proc;
268 struct vnode *vp = ap->a_vp;
269 struct vattr *vap = ap->a_vap;
270 struct filedesc *fdp;
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_td);
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;
358 * fdesc_setattr(struct vnode *a_vp, struct vattr *a_vap,
359 * struct ucred *a_cred, struct thread *a_td)
362 fdesc_setattr(struct vop_setattr_args *ap)
364 struct proc *p = ap->a_td->td_proc;
365 struct vattr *vap = ap->a_vap;
371 * Can't mess with the root vnode
373 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
376 fd = VTOFDESC(ap->a_vp)->fd_fd;
380 * Allow setattr where there is an underlying vnode.
382 error = getvnode(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)
403 * fdesc_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
404 * int *a_eofflag, u_long *a_cookies, int a_ncookies)
407 fdesc_readdir(struct vop_readdir_args *ap)
409 struct uio *uio = ap->a_uio;
410 struct filedesc *fdp;
412 struct dirent *dp = &d;
413 int error, i, off, fcnt;
416 * We don't allow exporting fdesc mounts, and currently local
417 * requests do not need cookies.
420 panic("fdesc_readdir: not hungry");
422 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
423 panic("fdesc_readdir: not dir");
425 off = (int)uio->uio_offset;
426 if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
427 uio->uio_resid < UIO_MX)
429 i = (u_int)off / UIO_MX;
430 KKASSERT(uio->uio_td->td_proc);
431 fdp = uio->uio_td->td_proc->p_fd;
434 fcnt = i - 2; /* The first two nodes are `.' and `..' */
436 while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
440 bzero((caddr_t)dp, UIO_MX);
442 dp->d_fileno = i + FD_ROOT;
443 dp->d_namlen = i + 1;
444 dp->d_reclen = UIO_MX;
445 bcopy("..", dp->d_name, dp->d_namlen);
446 dp->d_name[i + 1] = '\0';
450 if (fdp->fd_ofiles[fcnt] == NULL)
453 bzero((caddr_t) dp, UIO_MX);
454 dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
455 dp->d_reclen = UIO_MX;
456 dp->d_type = DT_UNKNOWN;
457 dp->d_fileno = i + FD_DESC;
461 * And ship to userland
463 error = uiomove((caddr_t) dp, UIO_MX, uio);
471 uio->uio_offset = i * UIO_MX;
476 * fdesc_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred,
477 * struct thread *a_td)
480 fdesc_poll(struct vop_poll_args *ap)
482 return seltrue(0, ap->a_events, ap->a_td);
486 * fdesc_inactive(struct vnode *a_vp, struct thread *a_td)
489 fdesc_inactive(struct vop_inactive_args *ap)
491 struct vnode *vp = ap->a_vp;
494 * Clear out the v_type field to avoid
495 * nasty things happening in vgone().
497 VOP_UNLOCK(vp, NULL, 0, ap->a_td);
503 * fdesc_reclaim(struct vnode *a_vp)
506 fdesc_reclaim(struct vop_reclaim_args *ap)
508 struct vnode *vp = ap->a_vp;
509 struct fdescnode *fd = VTOFDESC(vp);
511 LIST_REMOVE(fd, fd_hash);
512 FREE(vp->v_data, M_TEMP);
519 * Print out the contents of a /dev/fd vnode.
521 * fdesc_print(struct vnode *a_vp)
525 fdesc_print(struct vop_print_args *ap)
527 printf("tag VT_NON, fdesc vnode\n");
531 static struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
532 { &vop_default_desc, (vop_t *) vop_defaultop },
533 { &vop_access_desc, (vop_t *) vop_null },
534 { &vop_getattr_desc, (vop_t *) fdesc_getattr },
535 { &vop_inactive_desc, (vop_t *) fdesc_inactive },
536 { &vop_lookup_desc, (vop_t *) fdesc_lookup },
537 { &vop_open_desc, (vop_t *) fdesc_open },
538 { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
539 { &vop_poll_desc, (vop_t *) fdesc_poll },
540 { &vop_print_desc, (vop_t *) fdesc_print },
541 { &vop_readdir_desc, (vop_t *) fdesc_readdir },
542 { &vop_reclaim_desc, (vop_t *) fdesc_reclaim },
543 { &vop_setattr_desc, (vop_t *) fdesc_setattr },
546 static struct vnodeopv_desc fdesc_vnodeop_opv_desc =
547 { &fdesc_vnodeop_p, fdesc_vnodeop_entries };
549 VNODEOP_SET(fdesc_vnodeop_opv_desc);