2 * Copyright (c) 1992, 1993
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5 * This code is derived from software donated to Berkeley by
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32 * @(#)fdesc_vnops.c 8.9 (Berkeley) 1/21/94
34 * $FreeBSD: src/sys/miscfs/fdesc/fdesc_vnops.c,v 1.47.2.1 2001/10/22 22:49:26 chris Exp $
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/dirent.h>
45 #include <sys/filedesc.h>
46 #include <sys/kernel.h> /* boottime */
48 #include <sys/malloc.h>
49 #include <sys/file.h> /* Must come after sys/malloc.h */
50 #include <sys/mount.h>
52 #include <sys/namei.h>
53 #include <sys/socket.h>
55 #include <sys/vnode.h>
56 #include <sys/file2.h>
58 #include <machine/limits.h>
63 #define FDL_LOCKED 0x02
64 static int fdcache_lock;
67 #define FD_NHASH(ix) \
68 (&fdhashtbl[(ix) & fdhash])
69 static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
72 static int fdesc_getattr (struct vop_getattr_args *ap);
73 static int fdesc_inactive (struct vop_inactive_args *ap);
74 static int fdesc_lookup (struct vop_old_lookup_args *ap);
75 static int fdesc_open (struct vop_open_args *ap);
76 static int fdesc_print (struct vop_print_args *ap);
77 static int fdesc_readdir (struct vop_readdir_args *ap);
78 static int fdesc_reclaim (struct vop_reclaim_args *ap);
79 static int fdesc_setattr (struct vop_setattr_args *ap);
82 * Initialise cache headers
85 fdesc_init(struct vfsconf *vfsp)
88 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
93 fdesc_uninit(struct vfsconf *vfsp)
96 hashdestroy(fdhashtbl, M_CACHE, fdhash);
100 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, LK_EXCLUSIVE|LK_SLEEPFAIL))
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 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 fd = kmalloc(sizeof(struct fdescnode), M_TEMP, M_WAITOK);
135 error = getnewvnode(VT_FDESC, mp, vpp, 0, 0);
145 LIST_INSERT_HEAD(fc, fd, fd_hash);
149 fdcache_lock &= ~FDL_LOCKED;
151 if (fdcache_lock & FDL_WANT) {
152 fdcache_lock &= ~FDL_WANT;
153 wakeup((caddr_t) &fdcache_lock);
160 * vp is the current namei directory
161 * ndp is the name to locate in that directory...
163 * fdesc_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
164 * struct componentname *a_cnp)
167 fdesc_lookup(struct vop_old_lookup_args *ap)
169 struct componentname *cnp = ap->a_cnp;
170 struct thread *td = cnp->cn_td;
171 struct proc *p = td->td_proc;
172 struct vnode **vpp = ap->a_vpp;
173 struct vnode *dvp = ap->a_dvp;
174 char *pname = cnp->cn_nameptr;
175 int nlen = cnp->cn_namelen;
182 nfiles = p->p_fd->fd_nfiles;
183 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME) {
189 if (cnp->cn_namelen == 1 && *pname == '.') {
192 vn_lock(dvp, LK_SHARED | LK_RETRY);
196 if (VTOFDESC(dvp)->fd_type != Froot) {
202 /* the only time a leading 0 is acceptable is if it's "0" */
203 if (*pname == '0' && nlen != 1) {
208 if (*pname < '0' || *pname > '9') {
212 fd = 10 * fd + *pname++ - '0';
215 if (fd >= nfiles || p->p_fd->fd_files[fd].fp == NULL) {
220 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp);
223 VTOFDESC(fvp)->fd_fd = fd;
224 vn_lock(fvp, LK_SHARED | LK_RETRY);
229 vn_lock(dvp, LK_SHARED | LK_RETRY);
235 * fdesc_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
239 fdesc_open(struct vop_open_args *ap)
241 struct vnode *vp = ap->a_vp;
242 struct lwp *lp = curthread->td_lwp;
246 if (VTOFDESC(vp)->fd_type == Froot)
247 return (vop_stdopen(ap));
250 * XXX Kludge: set lp->lwp_dupfd to contain the value of the the file
251 * descriptor being sought for duplication. The error return ensures
252 * that the vnode for this device will be released by vn_open. Open
253 * will detect this special error and take the actions in dupfdopen.
254 * Other callers of vn_open or VOP_OPEN will simply report the
257 lp->lwp_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
262 * fdesc_getattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred)
265 fdesc_getattr(struct vop_getattr_args *ap)
267 struct proc *p = curproc;
268 struct vnode *vp = ap->a_vp;
269 struct vattr *vap = ap->a_vap;
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;
295 vap->va_rmajor = VNOVAL;
296 vap->va_rminor = VNOVAL;
301 fd = VTOFDESC(vp)->fd_fd;
303 fp = holdfp(p->p_fd, fd, -1);
307 bzero(&stb, sizeof(stb));
308 error = fo_stat(fp, &stb, curproc->p_ucred);
313 vap->va_type = IFTOVT(stb.st_mode);
314 vap->va_mode = stb.st_mode;
315 #define FDRX (VREAD|VEXEC)
316 if (vap->va_type == VDIR)
317 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
321 vap->va_bytes = stb.st_blocks * stb.st_blksize;
322 vap->va_fileid = VTOFDESC(vp)->fd_ix;
323 vap->va_size = stb.st_size;
324 vap->va_blocksize = stb.st_blksize;
325 vap->va_rmajor = umajor(stb.st_rdev);
326 vap->va_rminor = uminor(stb.st_rdev);
329 * If no time data is provided, use the current time.
331 if (stb.st_atimespec.tv_sec == 0 &&
332 stb.st_atimespec.tv_nsec == 0)
333 nanotime(&stb.st_atimespec);
335 if (stb.st_ctimespec.tv_sec == 0 &&
336 stb.st_ctimespec.tv_nsec == 0)
337 nanotime(&stb.st_ctimespec);
339 if (stb.st_mtimespec.tv_sec == 0 &&
340 stb.st_mtimespec.tv_nsec == 0)
341 nanotime(&stb.st_mtimespec);
343 vap->va_atime = stb.st_atimespec;
344 vap->va_mtime = stb.st_mtimespec;
345 vap->va_ctime = stb.st_ctimespec;
346 vap->va_uid = stb.st_uid;
347 vap->va_gid = stb.st_gid;
352 panic("fdesc_getattr");
357 vp->v_type = vap->va_type;
362 * fdesc_setattr(struct vnode *a_vp, struct vattr *a_vap,
363 * struct ucred *a_cred)
366 fdesc_setattr(struct vop_setattr_args *ap)
368 struct proc *p = curproc;
369 struct vattr *vap = ap->a_vap;
375 * Can't mess with the root vnode
377 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
380 fd = VTOFDESC(ap->a_vp)->fd_fd;
384 * Allow setattr where there is an underlying vnode.
386 error = holdvnode(p->p_fd, fd, &fp);
389 * holdvnode() returns EINVAL if the file descriptor is not
390 * backed by a vnode. Silently drop all changes except
391 * chflags(2) in this case.
393 if (error == EINVAL) {
394 if (vap->va_flags != VNOVAL)
408 * fdesc_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
409 * int *a_eofflag, off_t *a_cookies, int a_ncookies)
412 fdesc_readdir(struct vop_readdir_args *ap)
414 struct uio *uio = ap->a_uio;
415 struct filedesc *fdp;
418 char name[20]; /* enough for %d */
421 * We don't allow exporting fdesc mounts, and currently local
422 * requests do not need cookies.
425 panic("fdesc_readdir: not hungry");
427 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
428 panic("fdesc_readdir: not dir");
430 if (uio->uio_offset < 0 || uio->uio_offset > INT_MAX)
432 i = (int)uio->uio_offset;
433 KKASSERT(uio->uio_td->td_proc);
434 fdp = uio->uio_td->td_proc->p_fd;
437 fcnt = i - 2; /* The first two nodes are `.' and `..' */
439 while (fcnt < fdp->fd_nfiles && uio->uio_resid > 0 && !error) {
442 if (vop_write_dirent(&error, uio, FD_ROOT + i, DT_DIR,
449 if (vop_write_dirent(&error, uio, FD_ROOT + i, DT_DIR,
456 if (fdp->fd_files[fcnt].fp == NULL) {
461 namelen = ksnprintf(name, sizeof(name), "%d", fcnt);
462 if (vop_write_dirent(&error, uio, FD_ROOT + i,
463 DT_UNKNOWN, namelen, name))
475 uio->uio_offset = fcnt + 2;
482 * fdesc_inactive(struct vnode *a_vp)
485 fdesc_inactive(struct vop_inactive_args *ap)
487 struct vnode *vp = ap->a_vp;
490 * Clear out the v_type field to avoid
491 * nasty things happening in vgone().
498 * fdesc_reclaim(struct vnode *a_vp)
501 fdesc_reclaim(struct vop_reclaim_args *ap)
503 struct vnode *vp = ap->a_vp;
504 struct fdescnode *fd = VTOFDESC(vp);
506 LIST_REMOVE(fd, fd_hash);
507 kfree(vp->v_data, M_TEMP);
514 * Print out the contents of a /dev/fd vnode.
516 * fdesc_print(struct vnode *a_vp)
520 fdesc_print(struct vop_print_args *ap)
522 kprintf("tag VT_NON, fdesc vnode\n");
526 struct vop_ops fdesc_vnode_vops = {
527 .vop_default = vop_defaultop,
528 .vop_access = (void *)vop_null,
529 .vop_getattr = fdesc_getattr,
530 .vop_inactive = fdesc_inactive,
531 .vop_old_lookup = fdesc_lookup,
532 .vop_open = fdesc_open,
533 .vop_pathconf = vop_stdpathconf,
534 .vop_print = fdesc_print,
535 .vop_readdir = fdesc_readdir,
536 .vop_reclaim = fdesc_reclaim,
537 .vop_setattr = fdesc_setattr