3157714de7
file types to requiring all file types to properly implement fo_stat. This makes any new file type additions much easier as this code no longer has to be modified to accomodate it. o Instead of using curproc in fdesc_allocvp, pass a `struct proc' pointer as a new fifth parameter.
575 lines
13 KiB
C
575 lines
13 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)fdesc_vnops.c 8.9 (Berkeley) 1/21/94
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*
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* $FreeBSD$
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*/
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/*
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* /dev/fd Filesystem
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/kernel.h> /* boottime */
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#include <sys/filedesc.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/dirent.h>
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#include <sys/conf.h>
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#include <miscfs/fdesc/fdesc.h>
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#define FDL_WANT 0x01
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#define FDL_LOCKED 0x02
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static int fdcache_lock;
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static vop_t **fdesc_vnodeop_p;
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#define NFDCACHE 4
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#define FD_NHASH(ix) \
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(&fdhashtbl[(ix) & fdhash])
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static LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
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static u_long fdhash;
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static int fdesc_badop __P((void));
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static int fdesc_getattr __P((struct vop_getattr_args *ap));
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static int fdesc_inactive __P((struct vop_inactive_args *ap));
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static int fdesc_lookup __P((struct vop_lookup_args *ap));
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static int fdesc_open __P((struct vop_open_args *ap));
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static int fdesc_print __P((struct vop_print_args *ap));
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static int fdesc_readdir __P((struct vop_readdir_args *ap));
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static int fdesc_reclaim __P((struct vop_reclaim_args *ap));
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static int fdesc_poll __P((struct vop_poll_args *ap));
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static int fdesc_setattr __P((struct vop_setattr_args *ap));
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/*
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* Initialise cache headers
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*/
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int
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fdesc_init(vfsp)
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struct vfsconf *vfsp;
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{
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fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
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return (0);
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}
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int
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fdesc_allocvp(ftype, ix, mp, vpp, p)
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fdntype ftype;
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int ix;
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struct mount *mp;
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struct vnode **vpp;
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struct proc *p;
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{
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struct fdhashhead *fc;
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struct fdescnode *fd;
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int error = 0;
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fc = FD_NHASH(ix);
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loop:
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for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) {
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if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
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if (vget(fd->fd_vnode, 0, p))
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goto loop;
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*vpp = fd->fd_vnode;
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return (error);
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}
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}
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/*
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* otherwise lock the array while we call getnewvnode
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* since that can block.
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*/
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if (fdcache_lock & FDL_LOCKED) {
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fdcache_lock |= FDL_WANT;
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(void) tsleep((caddr_t) &fdcache_lock, PINOD, "fdalvp", 0);
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goto loop;
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}
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fdcache_lock |= FDL_LOCKED;
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/*
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* Do the MALLOC before the getnewvnode since doing so afterward
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* might cause a bogus v_data pointer to get dereferenced
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* elsewhere if MALLOC should block.
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*/
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MALLOC(fd, struct fdescnode *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
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error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
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if (error) {
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FREE(fd, M_TEMP);
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goto out;
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}
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(*vpp)->v_data = fd;
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fd->fd_vnode = *vpp;
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fd->fd_type = ftype;
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fd->fd_fd = -1;
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fd->fd_ix = ix;
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LIST_INSERT_HEAD(fc, fd, fd_hash);
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out:
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fdcache_lock &= ~FDL_LOCKED;
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if (fdcache_lock & FDL_WANT) {
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fdcache_lock &= ~FDL_WANT;
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wakeup((caddr_t) &fdcache_lock);
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}
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return (error);
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}
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/*
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* vp is the current namei directory
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* ndp is the name to locate in that directory...
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*/
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static int
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fdesc_lookup(ap)
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struct vop_lookup_args /* {
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struct vnode * a_dvp;
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struct vnode ** a_vpp;
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struct componentname * a_cnp;
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} */ *ap;
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{
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struct vnode **vpp = ap->a_vpp;
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struct vnode *dvp = ap->a_dvp;
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struct componentname *cnp = ap->a_cnp;
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char *pname = cnp->cn_nameptr;
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struct proc *p = cnp->cn_proc;
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int nlen = cnp->cn_namelen;
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int nfiles = p->p_fd->fd_nfiles;
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u_int fd;
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int error;
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struct vnode *fvp;
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if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) {
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error = EROFS;
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goto bad;
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}
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VOP_UNLOCK(dvp, 0, p);
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if (cnp->cn_namelen == 1 && *pname == '.') {
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*vpp = dvp;
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VREF(dvp);
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vn_lock(dvp, LK_SHARED | LK_RETRY, p);
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return (0);
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}
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if (VTOFDESC(dvp)->fd_type != Froot) {
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error = ENOTDIR;
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goto bad;
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}
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fd = 0;
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/* the only time a leading 0 is acceptable is if it's "0" */
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if (*pname == '0' && nlen != 1) {
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error = ENOENT;
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goto bad;
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}
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while (nlen--) {
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if (*pname < '0' || *pname > '9') {
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error = ENOENT;
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goto bad;
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}
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fd = 10 * fd + *pname++ - '0';
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}
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if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
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error = EBADF;
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goto bad;
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}
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error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, p);
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if (error)
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goto bad;
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VTOFDESC(fvp)->fd_fd = fd;
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vn_lock(fvp, LK_SHARED | LK_RETRY, p);
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*vpp = fvp;
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return (0);
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bad:
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vn_lock(dvp, LK_SHARED | LK_RETRY, p);
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*vpp = NULL;
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return (error);
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}
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static int
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fdesc_open(ap)
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struct vop_open_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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if (VTOFDESC(vp)->fd_type == Froot)
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return (0);
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/*
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* XXX Kludge: set p->p_dupfd to contain the value of the the file
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* descriptor being sought for duplication. The error return ensures
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* that the vnode for this device will be released by vn_open. Open
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* will detect this special error and take the actions in dupfdopen.
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* Other callers of vn_open or VOP_OPEN will simply report the
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* error.
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*/
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ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
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return (ENODEV);
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}
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static int
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fdesc_getattr(ap)
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struct vop_getattr_args /* {
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struct vnode *a_vp;
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struct vattr *a_vap;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct vattr *vap = ap->a_vap;
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struct filedesc *fdp = ap->a_p->p_fd;
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struct file *fp;
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struct stat stb;
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u_int fd;
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int error = 0;
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switch (VTOFDESC(vp)->fd_type) {
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case Froot:
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VATTR_NULL(vap);
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vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
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vap->va_type = VDIR;
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vap->va_nlink = 2;
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vap->va_size = DEV_BSIZE;
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vap->va_fileid = VTOFDESC(vp)->fd_ix;
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vap->va_uid = 0;
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vap->va_gid = 0;
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vap->va_blocksize = DEV_BSIZE;
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vap->va_atime.tv_sec = boottime.tv_sec;
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vap->va_atime.tv_nsec = 0;
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vap->va_mtime = vap->va_atime;
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vap->va_ctime = vap->va_mtime;
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vap->va_gen = 0;
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vap->va_flags = 0;
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vap->va_rdev = 0;
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vap->va_bytes = 0;
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break;
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case Fdesc:
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fd = VTOFDESC(vp)->fd_fd;
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if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL)
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return (EBADF);
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bzero(&stb, sizeof(stb));
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error = fo_stat(fp, &stb, ap->a_p);
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if (error == 0) {
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VATTR_NULL(vap);
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vap->va_type = IFTOVT(stb.st_mode);
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vap->va_mode = stb.st_mode;
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#define FDRX (VREAD|VEXEC)
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if (vap->va_type == VDIR)
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vap->va_mode &= ~((FDRX)|(FDRX>>3)|(FDRX>>6));
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#undef FDRX
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vap->va_nlink = 1;
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vap->va_flags = 0;
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vap->va_bytes = stb.st_blocks * stb.st_blksize;
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vap->va_fileid = VTOFDESC(vp)->fd_ix;
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vap->va_size = stb.st_size;
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vap->va_blocksize = stb.st_blksize;
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vap->va_rdev = stb.st_rdev;
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/*
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* If no time data is provided, use the current time.
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*/
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if (stb.st_atimespec.tv_sec == 0 &&
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stb.st_atimespec.tv_nsec == 0)
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nanotime(&stb.st_atimespec);
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if (stb.st_ctimespec.tv_sec == 0 &&
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stb.st_ctimespec.tv_nsec == 0)
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nanotime(&stb.st_ctimespec);
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if (stb.st_mtimespec.tv_sec == 0 &&
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stb.st_mtimespec.tv_nsec == 0)
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nanotime(&stb.st_mtimespec);
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vap->va_atime = stb.st_atimespec;
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vap->va_mtime = stb.st_mtimespec;
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vap->va_ctime = stb.st_ctimespec;
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vap->va_uid = stb.st_uid;
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vap->va_gid = stb.st_gid;
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}
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break;
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default:
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panic("fdesc_getattr");
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break;
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}
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if (error == 0)
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vp->v_type = vap->va_type;
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return (error);
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}
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static int
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fdesc_setattr(ap)
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struct vop_setattr_args /* {
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struct vnode *a_vp;
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struct vattr *a_vap;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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struct vattr *vap = ap->a_vap;
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struct vnode *vp;
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struct mount *mp;
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struct file *fp;
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unsigned fd;
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int error;
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/*
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* Can't mess with the root vnode
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*/
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if (VTOFDESC(ap->a_vp)->fd_type == Froot)
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return (EACCES);
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fd = VTOFDESC(ap->a_vp)->fd_fd;
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/*
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* Allow setattr where there is an underlying vnode.
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*/
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error = getvnode(ap->a_p->p_fd, fd, &fp);
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if (error) {
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/*
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* getvnode() returns EINVAL if the file descriptor is not
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* backed by a vnode. Silently drop all changes except
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* chflags(2) in this case.
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*/
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if (error == EINVAL) {
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if (vap->va_flags != VNOVAL)
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error = EOPNOTSUPP;
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else
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error = 0;
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}
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return (error);
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}
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vp = (struct vnode *)fp->f_data;
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if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
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return (error);
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error = VOP_SETATTR(vp, ap->a_vap, ap->a_cred, ap->a_p);
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vn_finished_write(mp);
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return (error);
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}
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#define UIO_MX 16
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static int
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fdesc_readdir(ap)
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struct vop_readdir_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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struct ucred *a_cred;
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int *a_eofflag;
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u_long *a_cookies;
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int a_ncookies;
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} */ *ap;
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{
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struct uio *uio = ap->a_uio;
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struct filedesc *fdp;
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struct dirent d;
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struct dirent *dp = &d;
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int error, i, off, fcnt;
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/*
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* We don't allow exporting fdesc mounts, and currently local
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* requests do not need cookies.
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*/
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if (ap->a_ncookies)
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panic("fdesc_readdir: not hungry");
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if (VTOFDESC(ap->a_vp)->fd_type != Froot)
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panic("fdesc_readdir: not dir");
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off = (int)uio->uio_offset;
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if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
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uio->uio_resid < UIO_MX)
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return (EINVAL);
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i = (u_int)off / UIO_MX;
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fdp = uio->uio_procp->p_fd;
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error = 0;
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fcnt = i - 2; /* The first two nodes are `.' and `..' */
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|
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while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
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switch (i) {
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case 0: /* `.' */
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case 1: /* `..' */
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bzero((caddr_t)dp, UIO_MX);
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dp->d_fileno = i + FD_ROOT;
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dp->d_namlen = i + 1;
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dp->d_reclen = UIO_MX;
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bcopy("..", dp->d_name, dp->d_namlen);
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dp->d_name[i + 1] = '\0';
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dp->d_type = DT_DIR;
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break;
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default:
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if (fdp->fd_ofiles[fcnt] == NULL)
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goto done;
|
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bzero((caddr_t) dp, UIO_MX);
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dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
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dp->d_reclen = UIO_MX;
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dp->d_type = DT_UNKNOWN;
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dp->d_fileno = i + FD_DESC;
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break;
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}
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/*
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* And ship to userland
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*/
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error = uiomove((caddr_t) dp, UIO_MX, uio);
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if (error)
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break;
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i++;
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fcnt++;
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}
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done:
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uio->uio_offset = i * UIO_MX;
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return (error);
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}
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|
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static int
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fdesc_poll(ap)
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struct vop_poll_args /* {
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struct vnode *a_vp;
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int a_events;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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return seltrue(0, ap->a_events, ap->a_p);
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}
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static int
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fdesc_inactive(ap)
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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struct proc *a_p;
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} */ *ap;
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{
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|
struct vnode *vp = ap->a_vp;
|
|
|
|
/*
|
|
* Clear out the v_type field to avoid
|
|
* nasty things happening in vgone().
|
|
*/
|
|
VOP_UNLOCK(vp, 0, ap->a_p);
|
|
vp->v_type = VNON;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
fdesc_reclaim(ap)
|
|
struct vop_reclaim_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct fdescnode *fd = VTOFDESC(vp);
|
|
|
|
LIST_REMOVE(fd, fd_hash);
|
|
FREE(vp->v_data, M_TEMP);
|
|
vp->v_data = 0;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a /dev/fd vnode.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
fdesc_print(ap)
|
|
struct vop_print_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
printf("tag VT_NON, fdesc vnode\n");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* /dev/fd "should never get here" operation
|
|
*/
|
|
static int
|
|
fdesc_badop()
|
|
{
|
|
|
|
panic("fdesc: bad op");
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
|
|
{ &vop_default_desc, (vop_t *) vop_defaultop },
|
|
{ &vop_access_desc, (vop_t *) vop_null },
|
|
{ &vop_bmap_desc, (vop_t *) fdesc_badop },
|
|
{ &vop_getattr_desc, (vop_t *) fdesc_getattr },
|
|
{ &vop_inactive_desc, (vop_t *) fdesc_inactive },
|
|
{ &vop_lookup_desc, (vop_t *) fdesc_lookup },
|
|
{ &vop_open_desc, (vop_t *) fdesc_open },
|
|
{ &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
|
|
{ &vop_poll_desc, (vop_t *) fdesc_poll },
|
|
{ &vop_print_desc, (vop_t *) fdesc_print },
|
|
{ &vop_readdir_desc, (vop_t *) fdesc_readdir },
|
|
{ &vop_reclaim_desc, (vop_t *) fdesc_reclaim },
|
|
{ &vop_setattr_desc, (vop_t *) fdesc_setattr },
|
|
{ NULL, NULL }
|
|
};
|
|
static struct vnodeopv_desc fdesc_vnodeop_opv_desc =
|
|
{ &fdesc_vnodeop_p, fdesc_vnodeop_entries };
|
|
|
|
VNODEOP_SET(fdesc_vnodeop_opv_desc);
|