2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
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 $
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>
56 #include <sys/namei.h>
57 #include <sys/socket.h>
59 #include <sys/vnode.h>
60 #include <sys/file2.h>
62 #include <machine/limits.h>
67 #define FDL_LOCKED 0x02
68 static int fdcache_lock;
71 #define FD_NHASH(ix) \
72 (&fdhashtbl[(ix) & fdhash])
73 static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
76 static int fdesc_getattr (struct vop_getattr_args *ap);
77 static int fdesc_inactive (struct vop_inactive_args *ap);
78 static int fdesc_lookup (struct vop_old_lookup_args *ap);
79 static int fdesc_open (struct vop_open_args *ap);
80 static int fdesc_print (struct vop_print_args *ap);
81 static int fdesc_readdir (struct vop_readdir_args *ap);
82 static int fdesc_reclaim (struct vop_reclaim_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_uninit(struct vfsconf *vfsp)
100 hashdestroy(fdhashtbl, M_CACHE, fdhash);
104 fdesc_allocvp(fdntype ftype, int ix, struct mount *mp, struct vnode **vpp)
106 struct fdhashhead *fc;
107 struct fdescnode *fd;
112 LIST_FOREACH(fd, fc, fd_hash) {
113 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
114 if (vget(fd->fd_vnode, LK_EXCLUSIVE|LK_SLEEPFAIL))
122 * otherwise lock the array while we call getnewvnode
123 * since that can block.
125 if (fdcache_lock & FDL_LOCKED) {
126 fdcache_lock |= FDL_WANT;
127 tsleep((caddr_t) &fdcache_lock, 0, "fdalvp", 0);
130 fdcache_lock |= FDL_LOCKED;
133 * Do the MALLOC before the getnewvnode since doing so afterward
134 * might cause a bogus v_data pointer to get dereferenced
135 * elsewhere if MALLOC should block.
137 fd = kmalloc(sizeof(struct fdescnode), M_TEMP, M_WAITOK);
139 error = getnewvnode(VT_FDESC, mp, vpp, 0, 0);
149 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...
167 * fdesc_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
168 * struct componentname *a_cnp)
171 fdesc_lookup(struct vop_old_lookup_args *ap)
173 struct componentname *cnp = ap->a_cnp;
174 struct thread *td = cnp->cn_td;
175 struct proc *p = td->td_proc;
176 struct vnode **vpp = ap->a_vpp;
177 struct vnode *dvp = ap->a_dvp;
178 char *pname = cnp->cn_nameptr;
179 int nlen = cnp->cn_namelen;
186 nfiles = p->p_fd->fd_nfiles;
187 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME) {
193 if (cnp->cn_namelen == 1 && *pname == '.') {
196 vn_lock(dvp, LK_SHARED | LK_RETRY);
200 if (VTOFDESC(dvp)->fd_type != Froot) {
206 /* the only time a leading 0 is acceptable is if it's "0" */
207 if (*pname == '0' && nlen != 1) {
212 if (*pname < '0' || *pname > '9') {
216 fd = 10 * fd + *pname++ - '0';
219 if (fd >= nfiles || p->p_fd->fd_files[fd].fp == NULL) {
224 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp);
227 VTOFDESC(fvp)->fd_fd = fd;
228 vn_lock(fvp, LK_SHARED | LK_RETRY);
233 vn_lock(dvp, LK_SHARED | LK_RETRY);
239 * fdesc_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
243 fdesc_open(struct vop_open_args *ap)
245 struct vnode *vp = ap->a_vp;
246 struct lwp *lp = curthread->td_lwp;
250 if (VTOFDESC(vp)->fd_type == Froot)
251 return (vop_stdopen(ap));
254 * XXX Kludge: set lp->lwp_dupfd to contain the value of the the file
255 * descriptor being sought for duplication. The error return ensures
256 * that the vnode for this device will be released by vn_open. Open
257 * will detect this special error and take the actions in dupfdopen.
258 * Other callers of vn_open or VOP_OPEN will simply report the
261 lp->lwp_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
266 * fdesc_getattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred)
269 fdesc_getattr(struct vop_getattr_args *ap)
271 struct proc *p = curproc;
272 struct vnode *vp = ap->a_vp;
273 struct vattr *vap = ap->a_vap;
281 switch (VTOFDESC(vp)->fd_type) {
285 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
288 vap->va_size = DEV_BSIZE;
289 vap->va_fileid = VTOFDESC(vp)->fd_ix;
292 vap->va_blocksize = DEV_BSIZE;
293 vap->va_atime.tv_sec = boottime.tv_sec;
294 vap->va_atime.tv_nsec = 0;
295 vap->va_mtime = vap->va_atime;
296 vap->va_ctime = vap->va_mtime;
299 vap->va_rmajor = VNOVAL;
300 vap->va_rminor = VNOVAL;
305 fd = VTOFDESC(vp)->fd_fd;
307 fp = holdfp(p->p_fd, fd, -1);
311 bzero(&stb, sizeof(stb));
312 error = fo_stat(fp, &stb, curproc->p_ucred);
317 vap->va_type = IFTOVT(stb.st_mode);
318 vap->va_mode = stb.st_mode;
319 #define FDRX (VREAD|VEXEC)
320 if (vap->va_type == VDIR)
321 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
325 vap->va_bytes = stb.st_blocks * stb.st_blksize;
326 vap->va_fileid = VTOFDESC(vp)->fd_ix;
327 vap->va_size = stb.st_size;
328 vap->va_blocksize = stb.st_blksize;
329 vap->va_rmajor = umajor(stb.st_rdev);
330 vap->va_rminor = uminor(stb.st_rdev);
333 * If no time data is provided, use the current time.
335 if (stb.st_atimespec.tv_sec == 0 &&
336 stb.st_atimespec.tv_nsec == 0)
337 nanotime(&stb.st_atimespec);
339 if (stb.st_ctimespec.tv_sec == 0 &&
340 stb.st_ctimespec.tv_nsec == 0)
341 nanotime(&stb.st_ctimespec);
343 if (stb.st_mtimespec.tv_sec == 0 &&
344 stb.st_mtimespec.tv_nsec == 0)
345 nanotime(&stb.st_mtimespec);
347 vap->va_atime = stb.st_atimespec;
348 vap->va_mtime = stb.st_mtimespec;
349 vap->va_ctime = stb.st_ctimespec;
350 vap->va_uid = stb.st_uid;
351 vap->va_gid = stb.st_gid;
356 panic("fdesc_getattr");
361 vp->v_type = vap->va_type;
366 * fdesc_setattr(struct vnode *a_vp, struct vattr *a_vap,
367 * struct ucred *a_cred)
370 fdesc_setattr(struct vop_setattr_args *ap)
372 struct proc *p = curproc;
373 struct vattr *vap = ap->a_vap;
379 * Can't mess with the root vnode
381 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
384 fd = VTOFDESC(ap->a_vp)->fd_fd;
388 * Allow setattr where there is an underlying vnode.
390 error = holdvnode(p->p_fd, fd, &fp);
393 * holdvnode() returns EINVAL if the file descriptor is not
394 * backed by a vnode. Silently drop all changes except
395 * chflags(2) in this case.
397 if (error == EINVAL) {
398 if (vap->va_flags != VNOVAL)
412 * fdesc_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
413 * int *a_eofflag, off_t *a_cookies, int a_ncookies)
416 fdesc_readdir(struct vop_readdir_args *ap)
418 struct uio *uio = ap->a_uio;
419 struct filedesc *fdp;
422 char name[20]; /* enough for %d */
425 * We don't allow exporting fdesc mounts, and currently local
426 * requests do not need cookies.
429 panic("fdesc_readdir: not hungry");
431 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
432 panic("fdesc_readdir: not dir");
434 if (uio->uio_offset < 0 || uio->uio_offset > INT_MAX)
436 i = (int)uio->uio_offset;
437 KKASSERT(uio->uio_td->td_proc);
438 fdp = uio->uio_td->td_proc->p_fd;
441 fcnt = i - 2; /* The first two nodes are `.' and `..' */
443 while (fcnt < fdp->fd_nfiles && uio->uio_resid > 0 && !error) {
446 if (vop_write_dirent(&error, uio, FD_ROOT + i, DT_DIR,
453 if (vop_write_dirent(&error, uio, FD_ROOT + i, DT_DIR,
460 if (fdp->fd_files[fcnt].fp == NULL) {
465 namelen = ksnprintf(name, sizeof(name), "%d", fcnt);
466 if (vop_write_dirent(&error, uio, FD_ROOT + i,
467 DT_UNKNOWN, namelen, name))
479 uio->uio_offset = fcnt + 2;
486 * fdesc_inactive(struct vnode *a_vp)
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().
502 * fdesc_reclaim(struct vnode *a_vp)
505 fdesc_reclaim(struct vop_reclaim_args *ap)
507 struct vnode *vp = ap->a_vp;
508 struct fdescnode *fd = VTOFDESC(vp);
510 LIST_REMOVE(fd, fd_hash);
511 kfree(vp->v_data, M_TEMP);
518 * Print out the contents of a /dev/fd vnode.
520 * fdesc_print(struct vnode *a_vp)
524 fdesc_print(struct vop_print_args *ap)
526 kprintf("tag VT_NON, fdesc vnode\n");
530 struct vop_ops fdesc_vnode_vops = {
531 .vop_default = vop_defaultop,
532 .vop_access = (void *)vop_null,
533 .vop_getattr = fdesc_getattr,
534 .vop_inactive = fdesc_inactive,
535 .vop_old_lookup = fdesc_lookup,
536 .vop_open = fdesc_open,
537 .vop_pathconf = vop_stdpathconf,
538 .vop_print = fdesc_print,
539 .vop_readdir = fdesc_readdir,
540 .vop_reclaim = fdesc_reclaim,
541 .vop_setattr = fdesc_setattr