2 * Copyright (c) 1992, 1993
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5 * This code is derived from software donated to Berkeley by
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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 1.17 2005/02/15 08:32:18 joerg 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, LK_EXCLUSIVE|LK_SLEEPFAIL, 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, vpp, 0, 0);
143 LIST_INSERT_HEAD(fc, fd, fd_hash);
147 fdcache_lock &= ~FDL_LOCKED;
149 if (fdcache_lock & FDL_WANT) {
150 fdcache_lock &= ~FDL_WANT;
151 wakeup((caddr_t) &fdcache_lock);
158 * vp is the current namei directory
159 * ndp is the name to locate in that directory...
161 * fdesc_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
162 * struct componentname *a_cnp)
165 fdesc_lookup(struct vop_lookup_args *ap)
167 struct componentname *cnp = ap->a_cnp;
168 struct thread *td = cnp->cn_td;
169 struct proc *p = td->td_proc;
170 struct vnode **vpp = ap->a_vpp;
171 struct vnode *dvp = ap->a_dvp;
172 char *pname = cnp->cn_nameptr;
173 int nlen = cnp->cn_namelen;
180 nfiles = p->p_fd->fd_nfiles;
181 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME) {
186 VOP_UNLOCK(dvp, 0, td);
187 if (cnp->cn_namelen == 1 && *pname == '.') {
190 vn_lock(dvp, LK_SHARED | LK_RETRY, td);
194 if (VTOFDESC(dvp)->fd_type != Froot) {
200 /* the only time a leading 0 is acceptable is if it's "0" */
201 if (*pname == '0' && nlen != 1) {
206 if (*pname < '0' || *pname > '9') {
210 fd = 10 * fd + *pname++ - '0';
213 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
218 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, td);
221 VTOFDESC(fvp)->fd_fd = fd;
222 vn_lock(fvp, LK_SHARED | LK_RETRY, td);
227 vn_lock(dvp, LK_SHARED | LK_RETRY, td);
233 * fdesc_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
234 * struct thread *a_td)
237 fdesc_open(struct vop_open_args *ap)
239 struct vnode *vp = ap->a_vp;
240 struct proc *p = ap->a_td->td_proc;
244 if (VTOFDESC(vp)->fd_type == Froot)
248 * XXX Kludge: set p->p_dupfd to contain the value of the the file
249 * descriptor being sought for duplication. The error return ensures
250 * that the vnode for this device will be released by vn_open. Open
251 * will detect this special error and take the actions in dupfdopen.
252 * Other callers of vn_open or VOP_OPEN will simply report the
255 p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
260 * fdesc_getattr(struct vnode *a_vp, struct vattr *a_vap,
261 * struct ucred *a_cred, struct thread *a_td)
264 fdesc_getattr(struct vop_getattr_args *ap)
266 struct proc *p = ap->a_td->td_proc;
267 struct vnode *vp = ap->a_vp;
268 struct vattr *vap = ap->a_vap;
269 struct filedesc *fdp;
277 switch (VTOFDESC(vp)->fd_type) {
281 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
284 vap->va_size = DEV_BSIZE;
285 vap->va_fileid = VTOFDESC(vp)->fd_ix;
288 vap->va_blocksize = DEV_BSIZE;
289 vap->va_atime.tv_sec = boottime.tv_sec;
290 vap->va_atime.tv_nsec = 0;
291 vap->va_mtime = vap->va_atime;
292 vap->va_ctime = vap->va_mtime;
300 fd = VTOFDESC(vp)->fd_fd;
302 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL)
305 bzero(&stb, sizeof(stb));
306 error = fo_stat(fp, &stb, ap->a_td);
309 vap->va_type = IFTOVT(stb.st_mode);
310 vap->va_mode = stb.st_mode;
311 #define FDRX (VREAD|VEXEC)
312 if (vap->va_type == VDIR)
313 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
317 vap->va_bytes = stb.st_blocks * stb.st_blksize;
318 vap->va_fileid = VTOFDESC(vp)->fd_ix;
319 vap->va_size = stb.st_size;
320 vap->va_blocksize = stb.st_blksize;
321 vap->va_rdev = stb.st_rdev;
324 * If no time data is provided, use the current time.
326 if (stb.st_atimespec.tv_sec == 0 &&
327 stb.st_atimespec.tv_nsec == 0)
328 nanotime(&stb.st_atimespec);
330 if (stb.st_ctimespec.tv_sec == 0 &&
331 stb.st_ctimespec.tv_nsec == 0)
332 nanotime(&stb.st_ctimespec);
334 if (stb.st_mtimespec.tv_sec == 0 &&
335 stb.st_mtimespec.tv_nsec == 0)
336 nanotime(&stb.st_mtimespec);
338 vap->va_atime = stb.st_atimespec;
339 vap->va_mtime = stb.st_mtimespec;
340 vap->va_ctime = stb.st_ctimespec;
341 vap->va_uid = stb.st_uid;
342 vap->va_gid = stb.st_gid;
347 panic("fdesc_getattr");
352 vp->v_type = vap->va_type;
357 * fdesc_setattr(struct vnode *a_vp, struct vattr *a_vap,
358 * struct ucred *a_cred, struct thread *a_td)
361 fdesc_setattr(struct vop_setattr_args *ap)
363 struct proc *p = ap->a_td->td_proc;
364 struct vattr *vap = ap->a_vap;
370 * Can't mess with the root vnode
372 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
375 fd = VTOFDESC(ap->a_vp)->fd_fd;
379 * Allow setattr where there is an underlying vnode.
381 error = getvnode(p->p_fd, fd, &fp);
384 * getvnode() returns EINVAL if the file descriptor is not
385 * backed by a vnode. Silently drop all changes except
386 * chflags(2) in this case.
388 if (error == EINVAL) {
389 if (vap->va_flags != VNOVAL)
402 * fdesc_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
403 * int *a_eofflag, u_long *a_cookies, int a_ncookies)
406 fdesc_readdir(struct vop_readdir_args *ap)
408 struct uio *uio = ap->a_uio;
409 struct filedesc *fdp;
411 struct dirent *dp = &d;
412 int error, i, off, fcnt;
415 * We don't allow exporting fdesc mounts, and currently local
416 * requests do not need cookies.
419 panic("fdesc_readdir: not hungry");
421 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
422 panic("fdesc_readdir: not dir");
424 off = (int)uio->uio_offset;
425 if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
426 uio->uio_resid < UIO_MX)
428 i = (u_int)off / UIO_MX;
429 KKASSERT(uio->uio_td->td_proc);
430 fdp = uio->uio_td->td_proc->p_fd;
433 fcnt = i - 2; /* The first two nodes are `.' and `..' */
435 while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
439 bzero((caddr_t)dp, UIO_MX);
441 dp->d_fileno = i + FD_ROOT;
442 dp->d_namlen = i + 1;
443 dp->d_reclen = UIO_MX;
444 bcopy("..", dp->d_name, dp->d_namlen);
445 dp->d_name[i + 1] = '\0';
449 if (fdp->fd_ofiles[fcnt] == NULL)
452 bzero((caddr_t) dp, UIO_MX);
453 dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
454 dp->d_reclen = UIO_MX;
455 dp->d_type = DT_UNKNOWN;
456 dp->d_fileno = i + FD_DESC;
460 * And ship to userland
462 error = uiomove((caddr_t) dp, UIO_MX, uio);
470 uio->uio_offset = i * UIO_MX;
475 * fdesc_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred,
476 * struct thread *a_td)
479 fdesc_poll(struct vop_poll_args *ap)
481 return seltrue(0, ap->a_events, ap->a_td);
485 * fdesc_inactive(struct vnode *a_vp, struct thread *a_td)
488 fdesc_inactive(struct vop_inactive_args *ap)
490 struct vnode *vp = ap->a_vp;
493 * Clear out the v_type field to avoid
494 * nasty things happening in vgone().
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, vop_defaultop },
531 { &vop_access_desc, vop_null },
532 { &vop_getattr_desc, (vnodeopv_entry_t) fdesc_getattr },
533 { &vop_inactive_desc, (vnodeopv_entry_t) fdesc_inactive },
534 { &vop_lookup_desc, (vnodeopv_entry_t) fdesc_lookup },
535 { &vop_open_desc, (vnodeopv_entry_t) fdesc_open },
536 { &vop_pathconf_desc, (vnodeopv_entry_t) vop_stdpathconf },
537 { &vop_poll_desc, (vnodeopv_entry_t) fdesc_poll },
538 { &vop_print_desc, (vnodeopv_entry_t) fdesc_print },
539 { &vop_readdir_desc, (vnodeopv_entry_t) fdesc_readdir },
540 { &vop_reclaim_desc, (vnodeopv_entry_t) fdesc_reclaim },
541 { &vop_setattr_desc, (vnodeopv_entry_t) fdesc_setattr },