670 lines
15 KiB
C
670 lines
15 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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. 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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/*
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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/capsicum.h>
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#include <sys/conf.h>
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#include <sys/dirent.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h> /* boottime */
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/malloc.h>
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#include <sys/file.h> /* Must come after sys/malloc.h */
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/syscallsubr.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <fs/fdescfs/fdesc.h>
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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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struct mtx fdesc_hashmtx;
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static vop_getattr_t fdesc_getattr;
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static vop_lookup_t fdesc_lookup;
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static vop_open_t fdesc_open;
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static vop_pathconf_t fdesc_pathconf;
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static vop_readdir_t fdesc_readdir;
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static vop_readlink_t fdesc_readlink;
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static vop_reclaim_t fdesc_reclaim;
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static vop_setattr_t fdesc_setattr;
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static struct vop_vector fdesc_vnodeops = {
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.vop_default = &default_vnodeops,
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.vop_access = VOP_NULL,
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.vop_getattr = fdesc_getattr,
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.vop_lookup = fdesc_lookup,
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.vop_open = fdesc_open,
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.vop_pathconf = fdesc_pathconf,
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.vop_readdir = fdesc_readdir,
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.vop_readlink = fdesc_readlink,
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.vop_reclaim = fdesc_reclaim,
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.vop_setattr = fdesc_setattr,
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};
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VFS_VOP_VECTOR_REGISTER(fdesc_vnodeops);
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static void fdesc_remove_entry(struct fdescnode *);
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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(struct vfsconf *vfsp)
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{
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mtx_init(&fdesc_hashmtx, "fdescfs_hash", NULL, MTX_DEF);
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fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
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return (0);
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}
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/*
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* Uninit ready for unload.
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*/
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int
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fdesc_uninit(struct vfsconf *vfsp)
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{
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hashdestroy(fdhashtbl, M_CACHE, fdhash);
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mtx_destroy(&fdesc_hashmtx);
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return (0);
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}
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/*
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* Remove an entry from the hash if it exists.
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*/
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static void
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fdesc_remove_entry(struct fdescnode *fd)
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{
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struct fdhashhead *fc;
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struct fdescnode *fd2;
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fc = FD_NHASH(fd->fd_ix);
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mtx_lock(&fdesc_hashmtx);
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LIST_FOREACH(fd2, fc, fd_hash) {
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if (fd == fd2) {
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LIST_REMOVE(fd, fd_hash);
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break;
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}
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}
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mtx_unlock(&fdesc_hashmtx);
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}
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int
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fdesc_allocvp(fdntype ftype, unsigned fd_fd, int ix, struct mount *mp,
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struct vnode **vpp)
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{
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struct fdescmount *fmp;
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struct fdhashhead *fc;
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struct fdescnode *fd, *fd2;
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struct vnode *vp, *vp2;
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enum vgetstate vgs;
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int error;
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fc = FD_NHASH(ix);
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loop:
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mtx_lock(&fdesc_hashmtx);
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/*
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* If a forced unmount is progressing, we need to drop it. The flags are
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* protected by the hashmtx.
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*/
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fmp = mp->mnt_data;
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if (fmp == NULL || fmp->flags & FMNT_UNMOUNTF) {
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mtx_unlock(&fdesc_hashmtx);
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return (-1);
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}
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LIST_FOREACH(fd, fc, fd_hash) {
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if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
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/* Get reference to vnode in case it's being free'd */
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vp = fd->fd_vnode;
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vgs = vget_prep(vp);
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mtx_unlock(&fdesc_hashmtx);
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if (vget_finish(vp, LK_EXCLUSIVE, vgs) != 0)
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goto loop;
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*vpp = vp;
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return (0);
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}
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}
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mtx_unlock(&fdesc_hashmtx);
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fd = malloc(sizeof(struct fdescnode), M_TEMP, M_WAITOK);
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error = getnewvnode("fdescfs", mp, &fdesc_vnodeops, &vp);
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if (error) {
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free(fd, M_TEMP);
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return (error);
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}
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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vp->v_data = fd;
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fd->fd_vnode = vp;
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fd->fd_type = ftype;
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fd->fd_fd = fd_fd;
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fd->fd_ix = ix;
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if (ftype == Fdesc) {
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if ((fmp->flags & FMNT_RDLNKF) != 0)
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vp->v_type = VLNK;
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else if ((fmp->flags & FMNT_LINRDLNKF) != 0)
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vp->v_vflag |= VV_READLINK;
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}
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error = insmntque1(vp, mp);
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if (error != 0) {
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vgone(vp);
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vput(vp);
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*vpp = NULLVP;
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return (error);
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}
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/* Make sure that someone didn't beat us when inserting the vnode. */
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mtx_lock(&fdesc_hashmtx);
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/*
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* If a forced unmount is progressing, we need to drop it. The flags are
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* protected by the hashmtx.
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*/
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fmp = mp->mnt_data;
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if (fmp == NULL || fmp->flags & FMNT_UNMOUNTF) {
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mtx_unlock(&fdesc_hashmtx);
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vgone(vp);
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vput(vp);
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*vpp = NULLVP;
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return (-1);
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}
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LIST_FOREACH(fd2, fc, fd_hash) {
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if (fd2->fd_ix == ix && fd2->fd_vnode->v_mount == mp) {
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/* Get reference to vnode in case it's being free'd */
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vp2 = fd2->fd_vnode;
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vgs = vget_prep(vp2);
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mtx_unlock(&fdesc_hashmtx);
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error = vget_finish(vp2, LK_EXCLUSIVE, vgs);
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/* Someone beat us, dec use count and wait for reclaim */
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vgone(vp);
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vput(vp);
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/* If we didn't get it, return no vnode. */
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if (error)
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vp2 = NULLVP;
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*vpp = vp2;
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return (error);
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}
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}
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/* If we came here, we can insert it safely. */
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LIST_INSERT_HEAD(fc, fd, fd_hash);
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mtx_unlock(&fdesc_hashmtx);
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vn_set_state(vp, VSTATE_CONSTRUCTED);
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*vpp = vp;
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return (0);
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}
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struct fdesc_get_ino_args {
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fdntype ftype;
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unsigned fd_fd;
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int ix;
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struct file *fp;
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struct thread *td;
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bool fdropped;
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};
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static int
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fdesc_get_ino_alloc(struct mount *mp, void *arg, int lkflags,
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struct vnode **rvp)
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{
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struct fdesc_get_ino_args *a;
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struct fdescmount *fdm;
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struct vnode *vp;
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int error;
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a = arg;
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fdm = VFSTOFDESC(mp);
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if ((fdm->flags & FMNT_NODUP) != 0 && a->fp->f_type == DTYPE_VNODE) {
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vp = a->fp->f_vnode;
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vget(vp, lkflags | LK_RETRY);
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*rvp = vp;
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error = 0;
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} else {
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error = fdesc_allocvp(a->ftype, a->fd_fd, a->ix, mp, rvp);
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}
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fdrop(a->fp, a->td);
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a->fdropped = true;
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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(struct vop_lookup_args *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 thread *td = curthread;
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struct file *fp;
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struct fdesc_get_ino_args arg;
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int nlen = cnp->cn_namelen;
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u_int fd, fd1;
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int error;
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struct vnode *fvp;
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if ((cnp->cn_flags & ISLASTCN) &&
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(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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if (cnp->cn_namelen == 1 && *pname == '.') {
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*vpp = dvp;
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VREF(dvp);
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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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fd1 = 10 * fd + *pname++ - '0';
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if (fd1 < fd) {
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error = ENOENT;
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goto bad;
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}
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fd = fd1;
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}
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/*
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* No rights to check since 'fp' isn't actually used.
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*/
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if ((error = fget(td, fd, &cap_no_rights, &fp)) != 0)
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goto bad;
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/*
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* Make sure we do not deadlock looking up the dvp itself.
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*
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* Unlock our root node (dvp) when doing this, since we might
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* deadlock since the vnode might be locked by another thread
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* and the root vnode lock will be obtained afterwards (in case
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* we're looking up the fd of the root vnode), which will be the
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* opposite lock order.
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*/
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arg.ftype = Fdesc;
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arg.fd_fd = fd;
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arg.ix = FD_DESC + fd;
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arg.fp = fp;
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arg.td = td;
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arg.fdropped = false;
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error = vn_vget_ino_gen(dvp, fdesc_get_ino_alloc, &arg,
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LK_EXCLUSIVE, &fvp);
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if (!arg.fdropped) {
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/*
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* In case we're holding the last reference to the file, the dvp
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* will be re-acquired.
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*/
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VOP_UNLOCK(dvp);
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fdrop(fp, td);
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vn_lock(dvp, LK_RETRY | LK_EXCLUSIVE);
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fvp = dvp;
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if (error == 0 && VN_IS_DOOMED(dvp))
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error = ENOENT;
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}
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if (error)
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goto bad;
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*vpp = fvp;
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return (0);
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bad:
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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(struct vop_open_args *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 td->td_proc->p_dupfd to contain the value of 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_td->td_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_pathconf(struct vop_pathconf_args *ap)
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{
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struct vnode *vp = ap->a_vp;
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int error;
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switch (ap->a_name) {
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case _PC_NAME_MAX:
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*ap->a_retval = NAME_MAX;
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return (0);
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case _PC_LINK_MAX:
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if (VTOFDESC(vp)->fd_type == Froot)
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*ap->a_retval = 2;
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else
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*ap->a_retval = 1;
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return (0);
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default:
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if (VTOFDESC(vp)->fd_type == Froot)
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return (vop_stdpathconf(ap));
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vref(vp);
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VOP_UNLOCK(vp);
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error = kern_fpathconf(curthread, VTOFDESC(vp)->fd_fd,
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ap->a_name, ap->a_retval);
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vn_lock(vp, LK_SHARED | LK_RETRY);
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vunref(vp);
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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_getattr(struct vop_getattr_args *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 timeval boottime;
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getboottime(&boottime);
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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_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_bytes = 0;
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vap->va_filerev = 0;
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switch (VTOFDESC(vp)->fd_type) {
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case Froot:
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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_rdev = NODEV;
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break;
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case Fdesc:
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vap->va_type = (VFSTOFDESC(vp->v_mount)->flags &
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(FMNT_RDLNKF | FMNT_LINRDLNKF)) == 0 ? VCHR : VLNK;
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vap->va_nlink = 1;
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vap->va_size = 0;
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vap->va_rdev = makedev(0, vap->va_fileid);
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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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vp->v_type = vap->va_type;
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return (0);
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}
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static int
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fdesc_setattr(struct vop_setattr_args *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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struct thread *td = curthread;
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cap_rights_t rights;
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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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* For O_PATH descriptors, disallow truncate.
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*/
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if (vap->va_size != VNOVAL) {
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error = getvnode(td, fd,
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cap_rights_init_one(&rights, CAP_EXTATTR_SET), &fp);
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} else {
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error = getvnode_path(td, fd,
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cap_rights_init_one(&rights, CAP_EXTATTR_SET), &fp);
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}
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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
|
|
* chflags(2) in this case.
|
|
*/
|
|
if (error == EINVAL) {
|
|
if (vap->va_flags != VNOVAL)
|
|
error = EOPNOTSUPP;
|
|
else
|
|
error = 0;
|
|
}
|
|
return (error);
|
|
}
|
|
vp = fp->f_vnode;
|
|
if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) == 0) {
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
error = VOP_SETATTR(vp, ap->a_vap, ap->a_cred);
|
|
VOP_UNLOCK(vp);
|
|
vn_finished_write(mp);
|
|
}
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
#define UIO_MX _GENERIC_DIRLEN(10) /* number of symbols in INT_MAX printout */
|
|
|
|
static int
|
|
fdesc_readdir(struct vop_readdir_args *ap)
|
|
{
|
|
struct fdescmount *fmp;
|
|
struct uio *uio = ap->a_uio;
|
|
struct filedesc *fdp;
|
|
struct dirent d;
|
|
struct dirent *dp = &d;
|
|
int error, i, off, fcnt;
|
|
|
|
if (VTOFDESC(ap->a_vp)->fd_type != Froot)
|
|
panic("fdesc_readdir: not dir");
|
|
|
|
fmp = VFSTOFDESC(ap->a_vp->v_mount);
|
|
if (ap->a_ncookies != NULL)
|
|
*ap->a_ncookies = 0;
|
|
|
|
off = (int)uio->uio_offset;
|
|
if (off != uio->uio_offset || off < 0 || (u_int)off % UIO_MX != 0 ||
|
|
uio->uio_resid < UIO_MX)
|
|
return (EINVAL);
|
|
i = (u_int)off / UIO_MX;
|
|
fdp = uio->uio_td->td_proc->p_fd;
|
|
error = 0;
|
|
|
|
fcnt = i - 2; /* The first two nodes are `.' and `..' */
|
|
|
|
FILEDESC_SLOCK(fdp);
|
|
while (i < fdp->fd_nfiles + 2 && uio->uio_resid >= UIO_MX) {
|
|
bzero((caddr_t)dp, UIO_MX);
|
|
switch (i) {
|
|
case 0: /* `.' */
|
|
case 1: /* `..' */
|
|
dp->d_fileno = i + FD_ROOT;
|
|
dp->d_namlen = i + 1;
|
|
dp->d_reclen = UIO_MX;
|
|
bcopy("..", dp->d_name, dp->d_namlen);
|
|
dp->d_type = DT_DIR;
|
|
dirent_terminate(dp);
|
|
break;
|
|
default:
|
|
if (fdp->fd_ofiles[fcnt].fde_file == NULL)
|
|
break;
|
|
dp->d_namlen = sprintf(dp->d_name, "%d", fcnt);
|
|
dp->d_reclen = UIO_MX;
|
|
dp->d_type = (fmp->flags & (FMNT_RDLNKF |
|
|
FMNT_LINRDLNKF)) == 0 ? DT_CHR : DT_LNK;
|
|
dp->d_fileno = i + FD_DESC;
|
|
dirent_terminate(dp);
|
|
break;
|
|
}
|
|
/* NOTE: d_off is the offset of the *next* entry. */
|
|
dp->d_off = UIO_MX * (i + 1);
|
|
if (dp->d_namlen != 0) {
|
|
/*
|
|
* And ship to userland
|
|
*/
|
|
FILEDESC_SUNLOCK(fdp);
|
|
error = uiomove(dp, UIO_MX, uio);
|
|
if (error)
|
|
goto done;
|
|
FILEDESC_SLOCK(fdp);
|
|
}
|
|
i++;
|
|
fcnt++;
|
|
}
|
|
FILEDESC_SUNLOCK(fdp);
|
|
|
|
done:
|
|
uio->uio_offset = i * UIO_MX;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
fdesc_reclaim(struct vop_reclaim_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct fdescnode *fd;
|
|
|
|
vp = ap->a_vp;
|
|
fd = VTOFDESC(vp);
|
|
fdesc_remove_entry(fd);
|
|
free(vp->v_data, M_TEMP);
|
|
vp->v_data = NULL;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
fdesc_readlink(struct vop_readlink_args *va)
|
|
{
|
|
struct vnode *vp, *vn;
|
|
struct thread *td;
|
|
struct uio *uio;
|
|
struct file *fp;
|
|
char *freepath, *fullpath;
|
|
size_t pathlen;
|
|
int lockflags, fd_fd;
|
|
int error;
|
|
|
|
freepath = NULL;
|
|
vn = va->a_vp;
|
|
if (VTOFDESC(vn)->fd_type != Fdesc)
|
|
panic("fdesc_readlink: not fdescfs link");
|
|
fd_fd = ((struct fdescnode *)vn->v_data)->fd_fd;
|
|
lockflags = VOP_ISLOCKED(vn);
|
|
VOP_UNLOCK(vn);
|
|
|
|
td = curthread;
|
|
error = fget_cap(td, fd_fd, &cap_no_rights, &fp, NULL);
|
|
if (error != 0)
|
|
goto out;
|
|
|
|
switch (fp->f_type) {
|
|
case DTYPE_VNODE:
|
|
vp = fp->f_vnode;
|
|
error = vn_fullpath(vp, &fullpath, &freepath);
|
|
break;
|
|
default:
|
|
fullpath = "anon_inode:[unknown]";
|
|
break;
|
|
}
|
|
if (error == 0) {
|
|
uio = va->a_uio;
|
|
pathlen = strlen(fullpath);
|
|
error = uiomove(fullpath, pathlen, uio);
|
|
}
|
|
if (freepath != NULL)
|
|
free(freepath, M_TEMP);
|
|
fdrop(fp, td);
|
|
|
|
out:
|
|
vn_lock(vn, lockflags | LK_RETRY);
|
|
return (error);
|
|
}
|