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 1.36 2006/12/23 00:41:29 swildner 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 kfree(fdhashtbl, M_CACHE);
106 fdesc_allocvp(fdntype ftype, int ix, struct mount *mp, struct vnode **vpp)
108 struct fdhashhead *fc;
109 struct fdescnode *fd;
114 LIST_FOREACH(fd, fc, fd_hash) {
115 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
116 if (vget(fd->fd_vnode, LK_EXCLUSIVE|LK_SLEEPFAIL))
124 * otherwise lock the array while we call getnewvnode
125 * since that can block.
127 if (fdcache_lock & FDL_LOCKED) {
128 fdcache_lock |= FDL_WANT;
129 tsleep((caddr_t) &fdcache_lock, 0, "fdalvp", 0);
132 fdcache_lock |= FDL_LOCKED;
135 * Do the MALLOC before the getnewvnode since doing so afterward
136 * might cause a bogus v_data pointer to get dereferenced
137 * elsewhere if MALLOC should block.
139 MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
141 error = getnewvnode(VT_FDESC, mp, vpp, 0, 0);
151 LIST_INSERT_HEAD(fc, fd, fd_hash);
155 fdcache_lock &= ~FDL_LOCKED;
157 if (fdcache_lock & FDL_WANT) {
158 fdcache_lock &= ~FDL_WANT;
159 wakeup((caddr_t) &fdcache_lock);
166 * vp is the current namei directory
167 * ndp is the name to locate in that directory...
169 * fdesc_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
170 * struct componentname *a_cnp)
173 fdesc_lookup(struct vop_old_lookup_args *ap)
175 struct componentname *cnp = ap->a_cnp;
176 struct thread *td = cnp->cn_td;
177 struct proc *p = td->td_proc;
178 struct vnode **vpp = ap->a_vpp;
179 struct vnode *dvp = ap->a_dvp;
180 char *pname = cnp->cn_nameptr;
181 int nlen = cnp->cn_namelen;
188 nfiles = p->p_fd->fd_nfiles;
189 if (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME) {
195 if (cnp->cn_namelen == 1 && *pname == '.') {
198 vn_lock(dvp, LK_SHARED | LK_RETRY);
202 if (VTOFDESC(dvp)->fd_type != Froot) {
208 /* the only time a leading 0 is acceptable is if it's "0" */
209 if (*pname == '0' && nlen != 1) {
214 if (*pname < '0' || *pname > '9') {
218 fd = 10 * fd + *pname++ - '0';
221 if (fd >= nfiles || p->p_fd->fd_files[fd].fp == NULL) {
226 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp);
229 VTOFDESC(fvp)->fd_fd = fd;
230 vn_lock(fvp, LK_SHARED | LK_RETRY);
235 vn_lock(dvp, LK_SHARED | LK_RETRY);
241 * fdesc_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred)
244 fdesc_open(struct vop_open_args *ap)
246 struct vnode *vp = ap->a_vp;
247 struct lwp *lp = curthread->td_lwp;
251 if (VTOFDESC(vp)->fd_type == Froot)
252 return (vop_stdopen(ap));
255 * XXX Kludge: set lp->lwp_dupfd to contain the value of the the file
256 * descriptor being sought for duplication. The error return ensures
257 * that the vnode for this device will be released by vn_open. Open
258 * will detect this special error and take the actions in dupfdopen.
259 * Other callers of vn_open or VOP_OPEN will simply report the
262 lp->lwp_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
267 * fdesc_getattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred)
270 fdesc_getattr(struct vop_getattr_args *ap)
272 struct proc *p = curproc;
273 struct vnode *vp = ap->a_vp;
274 struct vattr *vap = ap->a_vap;
282 switch (VTOFDESC(vp)->fd_type) {
286 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
289 vap->va_size = DEV_BSIZE;
290 vap->va_fileid = VTOFDESC(vp)->fd_ix;
293 vap->va_blocksize = DEV_BSIZE;
294 vap->va_atime.tv_sec = boottime.tv_sec;
295 vap->va_atime.tv_nsec = 0;
296 vap->va_mtime = vap->va_atime;
297 vap->va_ctime = vap->va_mtime;
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_rdev = stb.st_rdev;
332 * If no time data is provided, use the current time.
334 if (stb.st_atimespec.tv_sec == 0 &&
335 stb.st_atimespec.tv_nsec == 0)
336 nanotime(&stb.st_atimespec);
338 if (stb.st_ctimespec.tv_sec == 0 &&
339 stb.st_ctimespec.tv_nsec == 0)
340 nanotime(&stb.st_ctimespec);
342 if (stb.st_mtimespec.tv_sec == 0 &&
343 stb.st_mtimespec.tv_nsec == 0)
344 nanotime(&stb.st_mtimespec);
346 vap->va_atime = stb.st_atimespec;
347 vap->va_mtime = stb.st_mtimespec;
348 vap->va_ctime = stb.st_ctimespec;
349 vap->va_uid = stb.st_uid;
350 vap->va_gid = stb.st_gid;
355 panic("fdesc_getattr");
360 vp->v_type = vap->va_type;
365 * fdesc_setattr(struct vnode *a_vp, struct vattr *a_vap,
366 * struct ucred *a_cred, struct thread *a_td)
369 fdesc_setattr(struct vop_setattr_args *ap)
371 struct proc *p = curproc;
372 struct vattr *vap = ap->a_vap;
378 * Can't mess with the root vnode
380 if (VTOFDESC(ap->a_vp)->fd_type == Froot)
383 fd = VTOFDESC(ap->a_vp)->fd_fd;
387 * Allow setattr where there is an underlying vnode.
389 error = holdvnode(p->p_fd, fd, &fp);
392 * holdvnode() returns EINVAL if the file descriptor is not
393 * backed by a vnode. Silently drop all changes except
394 * chflags(2) in this case.
396 if (error == EINVAL) {
397 if (vap->va_flags != VNOVAL)
411 * fdesc_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
412 * int *a_eofflag, u_long *a_cookies, int a_ncookies)
415 fdesc_readdir(struct vop_readdir_args *ap)
417 struct uio *uio = ap->a_uio;
418 struct filedesc *fdp;
421 char name[20]; /* enough for %d */
424 * We don't allow exporting fdesc mounts, and currently local
425 * requests do not need cookies.
428 panic("fdesc_readdir: not hungry");
430 if (VTOFDESC(ap->a_vp)->fd_type != Froot)
431 panic("fdesc_readdir: not dir");
433 if (uio->uio_offset < 0 || uio->uio_offset > INT_MAX ||
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_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred,
487 * struct thread *a_td)
490 fdesc_poll(struct vop_poll_args *ap)
492 return seltrue(0, ap->a_events);
496 * fdesc_inactive(struct vnode *a_vp, struct thread *a_td)
499 fdesc_inactive(struct vop_inactive_args *ap)
501 struct vnode *vp = ap->a_vp;
504 * Clear out the v_type field to avoid
505 * nasty things happening in vgone().
512 * fdesc_reclaim(struct vnode *a_vp)
515 fdesc_reclaim(struct vop_reclaim_args *ap)
517 struct vnode *vp = ap->a_vp;
518 struct fdescnode *fd = VTOFDESC(vp);
520 LIST_REMOVE(fd, fd_hash);
521 FREE(vp->v_data, M_TEMP);
528 * Print out the contents of a /dev/fd vnode.
530 * fdesc_print(struct vnode *a_vp)
534 fdesc_print(struct vop_print_args *ap)
536 kprintf("tag VT_NON, fdesc vnode\n");
540 struct vop_ops fdesc_vnode_vops = {
541 .vop_default = vop_defaultop,
542 .vop_access = (void *)vop_null,
543 .vop_getattr = fdesc_getattr,
544 .vop_inactive = fdesc_inactive,
545 .vop_old_lookup = fdesc_lookup,
546 .vop_open = fdesc_open,
547 .vop_pathconf = vop_stdpathconf,
548 .vop_poll = fdesc_poll,
549 .vop_print = fdesc_print,
550 .vop_readdir = fdesc_readdir,
551 .vop_reclaim = fdesc_reclaim,
552 .vop_setattr = fdesc_setattr