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 1.27 2006/05/06 02:43:13 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>
63 #include <machine/limits.h>
68 #define FDL_LOCKED 0x02
69 static int fdcache_lock;
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_old_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_uninit(struct vfsconf *vfsp)
102 free(fdhashtbl, M_CACHE);
106 fdesc_allocvp(fdntype ftype, int ix, struct mount *mp, struct vnode **vpp,
109 struct fdhashhead *fc;
110 struct fdescnode *fd;
115 LIST_FOREACH(fd, fc, fd_hash) {
116 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
117 if (vget(fd->fd_vnode, LK_EXCLUSIVE|LK_SLEEPFAIL))
125 * otherwise lock the array while we call getnewvnode
126 * since that can block.
128 if (fdcache_lock & FDL_LOCKED) {
129 fdcache_lock |= FDL_WANT;
130 tsleep((caddr_t) &fdcache_lock, 0, "fdalvp", 0);
133 fdcache_lock |= FDL_LOCKED;
136 * Do the MALLOC before the getnewvnode since doing so afterward
137 * might cause a bogus v_data pointer to get dereferenced
138 * elsewhere if MALLOC should block.
140 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
142 error = getnewvnode(VT_FDESC, mp, vpp, 0, 0);
152 LIST_INSERT_HEAD(fc, fd, fd_hash);
156 fdcache_lock &= ~FDL_LOCKED;
158 if (fdcache_lock & FDL_WANT) {
159 fdcache_lock &= ~FDL_WANT;
160 wakeup((caddr_t) &fdcache_lock);
167 * vp is the current namei directory
168 * ndp is the name to locate in that directory...
170 * fdesc_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
171 * struct componentname *a_cnp)
174 fdesc_lookup(struct vop_old_lookup_args *ap)
176 struct componentname *cnp = ap->a_cnp;
177 struct thread *td = cnp->cn_td;
178 struct proc *p = td->td_proc;
179 struct vnode **vpp = ap->a_vpp;
180 struct vnode *dvp = ap->a_dvp;
181 char *pname = cnp->cn_nameptr;
182 int nlen = cnp->cn_namelen;
189 nfiles = p->p_fd->fd_nfiles;
190 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME) {
196 if (cnp->cn_namelen == 1 && *pname == '.') {
199 vn_lock(dvp, LK_SHARED | LK_RETRY);
203 if (VTOFDESC(dvp)->fd_type != Froot) {
209 /* the only time a leading 0 is acceptable is if it's "0" */
210 if (*pname == '0' && nlen != 1) {
215 if (*pname < '0' || *pname > '9') {
219 fd = 10 * fd + *pname++ - '0';
222 if (fd >= nfiles || p->p_fd->fd_files[fd].fp == NULL) {
227 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, td);
230 VTOFDESC(fvp)->fd_fd = fd;
231 vn_lock(fvp, LK_SHARED | LK_RETRY);
236 vn_lock(dvp, LK_SHARED | LK_RETRY);
242 * fdesc_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
245 fdesc_open(struct vop_open_args *ap)
247 struct vnode *vp = ap->a_vp;
248 struct lwp *lp = curthread->td_lwp;
252 if (VTOFDESC(vp)->fd_type == Froot)
253 return (vop_stdopen(ap));
256 * XXX Kludge: set lp->lwp_dupfd to contain the value of the the file
257 * descriptor being sought for duplication. The error return ensures
258 * that the vnode for this device will be released by vn_open. Open
259 * will detect this special error and take the actions in dupfdopen.
260 * Other callers of vn_open or VOP_OPEN will simply report the
263 lp->lwp_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
268 * fdesc_getattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred)
271 fdesc_getattr(struct vop_getattr_args *ap)
273 struct proc *p = curproc;
274 struct vnode *vp = ap->a_vp;
275 struct vattr *vap = ap->a_vap;
276 struct filedesc *fdp;
284 switch (VTOFDESC(vp)->fd_type) {
288 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
291 vap->va_size = DEV_BSIZE;
292 vap->va_fileid = VTOFDESC(vp)->fd_ix;
295 vap->va_blocksize = DEV_BSIZE;
296 vap->va_atime.tv_sec = boottime.tv_sec;
297 vap->va_atime.tv_nsec = 0;
298 vap->va_mtime = vap->va_atime;
299 vap->va_ctime = vap->va_mtime;
307 fd = VTOFDESC(vp)->fd_fd;
309 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_files[fd].fp) == NULL)
312 bzero(&stb, sizeof(stb));
313 error = fo_stat(fp, &stb, curproc->p_ucred);
316 vap->va_type = IFTOVT(stb.st_mode);
317 vap->va_mode = stb.st_mode;
318 #define FDRX (VREAD|VEXEC)
319 if (vap->va_type == VDIR)
320 vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
324 vap->va_bytes = stb.st_blocks * stb.st_blksize;
325 vap->va_fileid = VTOFDESC(vp)->fd_ix;
326 vap->va_size = stb.st_size;
327 vap->va_blocksize = stb.st_blksize;
328 vap->va_rdev = stb.st_rdev;
331 * If no time data is provided, use the current time.
333 if (stb.st_atimespec.tv_sec == 0 &&
334 stb.st_atimespec.tv_nsec == 0)
335 nanotime(&stb.st_atimespec);
337 if (stb.st_ctimespec.tv_sec == 0 &&
338 stb.st_ctimespec.tv_nsec == 0)
339 nanotime(&stb.st_ctimespec);
341 if (stb.st_mtimespec.tv_sec == 0 &&
342 stb.st_mtimespec.tv_nsec == 0)
343 nanotime(&stb.st_mtimespec);
345 vap->va_atime = stb.st_atimespec;
346 vap->va_mtime = stb.st_mtimespec;
347 vap->va_ctime = stb.st_ctimespec;
348 vap->va_uid = stb.st_uid;
349 vap->va_gid = stb.st_gid;
354 panic("fdesc_getattr");
359 vp->v_type = vap->va_type;
364 * fdesc_setattr(struct vnode *a_vp, struct vattr *a_vap,
365 * struct ucred *a_cred, struct thread *a_td)
368 fdesc_setattr(struct vop_setattr_args *ap)
370 struct proc *p = curproc;
371 struct vattr *vap = ap->a_vap;
377 * Can't mess with the root vnode
379 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
382 fd = VTOFDESC(ap->a_vp)->fd_fd;
386 * Allow setattr where there is an underlying vnode.
388 error = getvnode(p->p_fd, fd, &fp);
391 * getvnode() returns EINVAL if the file descriptor is not
392 * backed by a vnode. Silently drop all changes except
393 * chflags(2) in this case.
395 if (error == EINVAL) {
396 if (vap->va_flags != VNOVAL)
409 * fdesc_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
410 * int *a_eofflag, u_long *a_cookies, int a_ncookies)
413 fdesc_readdir(struct vop_readdir_args *ap)
415 struct uio *uio = ap->a_uio;
416 struct filedesc *fdp;
419 char name[20]; /* enough for %d */
422 * We don't allow exporting fdesc mounts, and currently local
423 * requests do not need cookies.
426 panic("fdesc_readdir: not hungry");
428 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
429 panic("fdesc_readdir: not dir");
431 if (uio->uio_offset < 0 || uio->uio_offset > INT_MAX ||
435 KKASSERT(uio->uio_td->td_proc);
436 fdp = uio->uio_td->td_proc->p_fd;
439 fcnt = i - 2; /* The first two nodes are `.' and `..' */
441 while (fcnt < fdp->fd_nfiles && uio->uio_resid > 0 && !error) {
444 if (vop_write_dirent(&error, uio, FD_ROOT + i, DT_DIR,
451 if (vop_write_dirent(&error, uio, FD_ROOT + i, DT_DIR,
458 if (fdp->fd_files[fcnt].fp == NULL) {
463 namelen = snprintf(name, sizeof(name), "%d", fcnt);
464 if (vop_write_dirent(&error, uio, FD_ROOT + i,
465 DT_UNKNOWN, namelen, name))
477 uio->uio_offset = fcnt + 2;
484 * fdesc_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred,
485 * struct thread *a_td)
488 fdesc_poll(struct vop_poll_args *ap)
490 return seltrue(0, ap->a_events, curthread);
494 * fdesc_inactive(struct vnode *a_vp, struct thread *a_td)
497 fdesc_inactive(struct vop_inactive_args *ap)
499 struct vnode *vp = ap->a_vp;
502 * Clear out the v_type field to avoid
503 * nasty things happening in vgone().
510 * fdesc_reclaim(struct vnode *a_vp)
513 fdesc_reclaim(struct vop_reclaim_args *ap)
515 struct vnode *vp = ap->a_vp;
516 struct fdescnode *fd = VTOFDESC(vp);
518 LIST_REMOVE(fd, fd_hash);
519 FREE(vp->v_data, M_TEMP);
526 * Print out the contents of a /dev/fd vnode.
528 * fdesc_print(struct vnode *a_vp)
532 fdesc_print(struct vop_print_args *ap)
534 printf("tag VT_NON, fdesc vnode\n");
538 struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
539 { &vop_default_desc, vop_defaultop },
540 { &vop_access_desc, vop_null },
541 { &vop_getattr_desc, (vnodeopv_entry_t) fdesc_getattr },
542 { &vop_inactive_desc, (vnodeopv_entry_t) fdesc_inactive },
543 { &vop_old_lookup_desc, (vnodeopv_entry_t) fdesc_lookup },
544 { &vop_open_desc, (vnodeopv_entry_t) fdesc_open },
545 { &vop_pathconf_desc, (vnodeopv_entry_t) vop_stdpathconf },
546 { &vop_poll_desc, (vnodeopv_entry_t) fdesc_poll },
547 { &vop_print_desc, (vnodeopv_entry_t) fdesc_print },
548 { &vop_readdir_desc, (vnodeopv_entry_t) fdesc_readdir },
549 { &vop_reclaim_desc, (vnodeopv_entry_t) fdesc_reclaim },
550 { &vop_setattr_desc, (vnodeopv_entry_t) fdesc_setattr },