0f281bd3eb
cdp_maxdirent in struct:cdev_priv is of type u_int. Use the same type for the corresponding index in devfs_revoke(). MFC after: 1 week
1928 lines
44 KiB
C
1928 lines
44 KiB
C
/*-
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* Copyright (c) 2000-2004
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* Poul-Henning Kamp. All rights reserved.
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* Copyright (c) 1989, 1992-1993, 1995
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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. 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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* @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95
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* From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43
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*
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* $FreeBSD$
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*/
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/*
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* TODO:
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* mkdir: want it ?
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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/conf.h>
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#include <sys/dirent.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/filio.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/ttycom.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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static struct vop_vector devfs_vnodeops;
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static struct vop_vector devfs_specops;
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static struct fileops devfs_ops_f;
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#include <fs/devfs/devfs.h>
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#include <fs/devfs/devfs_int.h>
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#include <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_object.h>
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static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data");
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struct mtx devfs_de_interlock;
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MTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF);
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struct sx clone_drain_lock;
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SX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock");
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struct mtx cdevpriv_mtx;
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MTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF);
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SYSCTL_DECL(_vfs_devfs);
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static int devfs_dotimes;
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SYSCTL_INT(_vfs_devfs, OID_AUTO, dotimes, CTLFLAG_RW,
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&devfs_dotimes, 0, "Update timestamps on DEVFS with default precision");
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/*
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* Update devfs node timestamp. Note that updates are unlocked and
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* stat(2) could see partially updated times.
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*/
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static void
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devfs_timestamp(struct timespec *tsp)
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{
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time_t ts;
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if (devfs_dotimes) {
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vfs_timestamp(tsp);
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} else {
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ts = time_second;
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if (tsp->tv_sec != ts) {
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tsp->tv_sec = ts;
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tsp->tv_nsec = 0;
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}
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}
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}
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static int
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devfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp,
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int *ref)
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{
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*dswp = devvn_refthread(fp->f_vnode, devp, ref);
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if (*devp != fp->f_data) {
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if (*dswp != NULL)
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dev_relthread(*devp, *ref);
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return (ENXIO);
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}
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KASSERT((*devp)->si_refcount > 0,
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("devfs: un-referenced struct cdev *(%s)", devtoname(*devp)));
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if (*dswp == NULL)
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return (ENXIO);
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curthread->td_fpop = fp;
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return (0);
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}
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int
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devfs_get_cdevpriv(void **datap)
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{
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struct file *fp;
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struct cdev_privdata *p;
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int error;
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fp = curthread->td_fpop;
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if (fp == NULL)
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return (EBADF);
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p = fp->f_cdevpriv;
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if (p != NULL) {
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error = 0;
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*datap = p->cdpd_data;
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} else
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error = ENOENT;
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return (error);
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}
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int
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devfs_set_cdevpriv(void *priv, d_priv_dtor_t *priv_dtr)
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{
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struct file *fp;
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struct cdev_priv *cdp;
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struct cdev_privdata *p;
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int error;
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fp = curthread->td_fpop;
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if (fp == NULL)
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return (ENOENT);
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cdp = cdev2priv((struct cdev *)fp->f_data);
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p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK);
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p->cdpd_data = priv;
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p->cdpd_dtr = priv_dtr;
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p->cdpd_fp = fp;
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mtx_lock(&cdevpriv_mtx);
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if (fp->f_cdevpriv == NULL) {
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LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list);
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fp->f_cdevpriv = p;
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mtx_unlock(&cdevpriv_mtx);
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error = 0;
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} else {
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mtx_unlock(&cdevpriv_mtx);
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free(p, M_CDEVPDATA);
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error = EBUSY;
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}
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return (error);
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}
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void
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devfs_destroy_cdevpriv(struct cdev_privdata *p)
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{
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mtx_assert(&cdevpriv_mtx, MA_OWNED);
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KASSERT(p->cdpd_fp->f_cdevpriv == p,
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("devfs_destoy_cdevpriv %p != %p", p->cdpd_fp->f_cdevpriv, p));
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p->cdpd_fp->f_cdevpriv = NULL;
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LIST_REMOVE(p, cdpd_list);
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mtx_unlock(&cdevpriv_mtx);
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(p->cdpd_dtr)(p->cdpd_data);
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free(p, M_CDEVPDATA);
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}
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static void
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devfs_fpdrop(struct file *fp)
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{
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struct cdev_privdata *p;
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mtx_lock(&cdevpriv_mtx);
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if ((p = fp->f_cdevpriv) == NULL) {
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mtx_unlock(&cdevpriv_mtx);
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return;
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}
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devfs_destroy_cdevpriv(p);
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}
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void
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devfs_clear_cdevpriv(void)
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{
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struct file *fp;
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fp = curthread->td_fpop;
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if (fp == NULL)
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return;
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devfs_fpdrop(fp);
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}
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/*
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* On success devfs_populate_vp() returns with dmp->dm_lock held.
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*/
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static int
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devfs_populate_vp(struct vnode *vp)
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{
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struct devfs_dirent *de;
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struct devfs_mount *dmp;
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int locked;
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ASSERT_VOP_LOCKED(vp, "devfs_populate_vp");
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dmp = VFSTODEVFS(vp->v_mount);
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locked = VOP_ISLOCKED(vp);
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sx_xlock(&dmp->dm_lock);
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DEVFS_DMP_HOLD(dmp);
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/* Can't call devfs_populate() with the vnode lock held. */
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VOP_UNLOCK(vp, 0);
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devfs_populate(dmp);
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sx_xunlock(&dmp->dm_lock);
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vn_lock(vp, locked | LK_RETRY);
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sx_xlock(&dmp->dm_lock);
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if (DEVFS_DMP_DROP(dmp)) {
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sx_xunlock(&dmp->dm_lock);
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devfs_unmount_final(dmp);
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return (ERESTART);
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}
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if ((vp->v_iflag & VI_DOOMED) != 0) {
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sx_xunlock(&dmp->dm_lock);
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return (ERESTART);
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}
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de = vp->v_data;
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KASSERT(de != NULL,
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("devfs_populate_vp: vp->v_data == NULL but vnode not doomed"));
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if ((de->de_flags & DE_DOOMED) != 0) {
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sx_xunlock(&dmp->dm_lock);
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return (ERESTART);
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}
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return (0);
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}
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static int
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devfs_vptocnp(struct vop_vptocnp_args *ap)
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{
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struct vnode *vp = ap->a_vp;
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struct vnode **dvp = ap->a_vpp;
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struct devfs_mount *dmp;
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char *buf = ap->a_buf;
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int *buflen = ap->a_buflen;
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struct devfs_dirent *dd, *de;
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int i, error;
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dmp = VFSTODEVFS(vp->v_mount);
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error = devfs_populate_vp(vp);
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if (error != 0)
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return (error);
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i = *buflen;
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dd = vp->v_data;
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if (vp->v_type == VCHR) {
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i -= strlen(dd->de_cdp->cdp_c.si_name);
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if (i < 0) {
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error = ENOMEM;
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goto finished;
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}
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bcopy(dd->de_cdp->cdp_c.si_name, buf + i,
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strlen(dd->de_cdp->cdp_c.si_name));
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de = dd->de_dir;
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} else if (vp->v_type == VDIR) {
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if (dd == dmp->dm_rootdir) {
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*dvp = vp;
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vref(*dvp);
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goto finished;
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}
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i -= dd->de_dirent->d_namlen;
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if (i < 0) {
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error = ENOMEM;
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goto finished;
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}
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bcopy(dd->de_dirent->d_name, buf + i,
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dd->de_dirent->d_namlen);
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de = dd;
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} else {
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error = ENOENT;
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goto finished;
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}
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*buflen = i;
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de = devfs_parent_dirent(de);
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if (de == NULL) {
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error = ENOENT;
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goto finished;
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}
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mtx_lock(&devfs_de_interlock);
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*dvp = de->de_vnode;
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if (*dvp != NULL) {
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VI_LOCK(*dvp);
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mtx_unlock(&devfs_de_interlock);
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vholdl(*dvp);
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VI_UNLOCK(*dvp);
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vref(*dvp);
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vdrop(*dvp);
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} else {
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mtx_unlock(&devfs_de_interlock);
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error = ENOENT;
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}
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finished:
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sx_xunlock(&dmp->dm_lock);
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return (error);
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}
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/*
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* Construct the fully qualified path name relative to the mountpoint.
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* If a NULL cnp is provided, no '/' is appended to the resulting path.
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*/
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char *
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devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd,
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struct componentname *cnp)
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{
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int i;
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struct devfs_dirent *de;
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sx_assert(&dmp->dm_lock, SA_LOCKED);
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i = SPECNAMELEN;
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buf[i] = '\0';
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if (cnp != NULL)
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i -= cnp->cn_namelen;
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if (i < 0)
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return (NULL);
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if (cnp != NULL)
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bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
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de = dd;
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while (de != dmp->dm_rootdir) {
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if (cnp != NULL || i < SPECNAMELEN) {
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i--;
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if (i < 0)
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return (NULL);
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buf[i] = '/';
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}
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i -= de->de_dirent->d_namlen;
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if (i < 0)
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return (NULL);
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bcopy(de->de_dirent->d_name, buf + i,
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de->de_dirent->d_namlen);
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de = devfs_parent_dirent(de);
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if (de == NULL)
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return (NULL);
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}
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return (buf + i);
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}
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static int
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devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp,
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struct devfs_dirent *de)
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{
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int not_found;
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not_found = 0;
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if (de->de_flags & DE_DOOMED)
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not_found = 1;
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if (DEVFS_DE_DROP(de)) {
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KASSERT(not_found == 1, ("DEVFS de dropped but not doomed"));
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devfs_dirent_free(de);
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}
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if (DEVFS_DMP_DROP(dmp)) {
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KASSERT(not_found == 1,
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("DEVFS mount struct freed before dirent"));
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not_found = 2;
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sx_xunlock(&dmp->dm_lock);
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devfs_unmount_final(dmp);
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}
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if (not_found == 1 || (drop_dm_lock && not_found != 2))
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sx_unlock(&dmp->dm_lock);
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return (not_found);
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}
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|
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static void
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devfs_insmntque_dtr(struct vnode *vp, void *arg)
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{
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struct devfs_dirent *de;
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de = (struct devfs_dirent *)arg;
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mtx_lock(&devfs_de_interlock);
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vp->v_data = NULL;
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de->de_vnode = NULL;
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mtx_unlock(&devfs_de_interlock);
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vgone(vp);
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vput(vp);
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}
|
|
|
|
/*
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* devfs_allocv shall be entered with dmp->dm_lock held, and it drops
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* it on return.
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*/
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int
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devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode,
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struct vnode **vpp)
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{
|
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int error;
|
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struct vnode *vp;
|
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struct cdev *dev;
|
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struct devfs_mount *dmp;
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struct cdevsw *dsw;
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|
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dmp = VFSTODEVFS(mp);
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if (de->de_flags & DE_DOOMED) {
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sx_xunlock(&dmp->dm_lock);
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return (ENOENT);
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}
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loop:
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DEVFS_DE_HOLD(de);
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DEVFS_DMP_HOLD(dmp);
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mtx_lock(&devfs_de_interlock);
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vp = de->de_vnode;
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if (vp != NULL) {
|
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VI_LOCK(vp);
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mtx_unlock(&devfs_de_interlock);
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sx_xunlock(&dmp->dm_lock);
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vget(vp, lockmode | LK_INTERLOCK | LK_RETRY, curthread);
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sx_xlock(&dmp->dm_lock);
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if (devfs_allocv_drop_refs(0, dmp, de)) {
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vput(vp);
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return (ENOENT);
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}
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else if ((vp->v_iflag & VI_DOOMED) != 0) {
|
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mtx_lock(&devfs_de_interlock);
|
|
if (de->de_vnode == vp) {
|
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de->de_vnode = NULL;
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vp->v_data = NULL;
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}
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mtx_unlock(&devfs_de_interlock);
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vput(vp);
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goto loop;
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|
}
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sx_xunlock(&dmp->dm_lock);
|
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*vpp = vp;
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return (0);
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}
|
|
mtx_unlock(&devfs_de_interlock);
|
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if (de->de_dirent->d_type == DT_CHR) {
|
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if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) {
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|
devfs_allocv_drop_refs(1, dmp, de);
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return (ENOENT);
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}
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dev = &de->de_cdp->cdp_c;
|
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} else {
|
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dev = NULL;
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}
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error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp);
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if (error != 0) {
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devfs_allocv_drop_refs(1, dmp, de);
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printf("devfs_allocv: failed to allocate new vnode\n");
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return (error);
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}
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|
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if (de->de_dirent->d_type == DT_CHR) {
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vp->v_type = VCHR;
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VI_LOCK(vp);
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|
dev_lock();
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|
dev_refl(dev);
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|
/* XXX: v_rdev should be protect by vnode lock */
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vp->v_rdev = dev;
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KASSERT(vp->v_usecount == 1,
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("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount));
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|
dev->si_usecount += vp->v_usecount;
|
|
/* Special casing of ttys for deadfs. Probably redundant. */
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|
dsw = dev->si_devsw;
|
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if (dsw != NULL && (dsw->d_flags & D_TTY) != 0)
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|
vp->v_vflag |= VV_ISTTY;
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|
dev_unlock();
|
|
VI_UNLOCK(vp);
|
|
if ((dev->si_flags & SI_ETERNAL) != 0)
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|
vp->v_vflag |= VV_ETERNALDEV;
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|
vp->v_op = &devfs_specops;
|
|
} else if (de->de_dirent->d_type == DT_DIR) {
|
|
vp->v_type = VDIR;
|
|
} else if (de->de_dirent->d_type == DT_LNK) {
|
|
vp->v_type = VLNK;
|
|
} else {
|
|
vp->v_type = VBAD;
|
|
}
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS);
|
|
VN_LOCK_ASHARE(vp);
|
|
mtx_lock(&devfs_de_interlock);
|
|
vp->v_data = de;
|
|
de->de_vnode = vp;
|
|
mtx_unlock(&devfs_de_interlock);
|
|
error = insmntque1(vp, mp, devfs_insmntque_dtr, de);
|
|
if (error != 0) {
|
|
(void) devfs_allocv_drop_refs(1, dmp, de);
|
|
return (error);
|
|
}
|
|
if (devfs_allocv_drop_refs(0, dmp, de)) {
|
|
vput(vp);
|
|
return (ENOENT);
|
|
}
|
|
#ifdef MAC
|
|
mac_devfs_vnode_associate(mp, de, vp);
|
|
#endif
|
|
sx_xunlock(&dmp->dm_lock);
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
devfs_access(struct vop_access_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct devfs_dirent *de;
|
|
struct proc *p;
|
|
int error;
|
|
|
|
de = vp->v_data;
|
|
if (vp->v_type == VDIR)
|
|
de = de->de_dir;
|
|
|
|
error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
|
|
ap->a_accmode, ap->a_cred, NULL);
|
|
if (error == 0)
|
|
return (0);
|
|
if (error != EACCES)
|
|
return (error);
|
|
p = ap->a_td->td_proc;
|
|
/* We do, however, allow access to the controlling terminal */
|
|
PROC_LOCK(p);
|
|
if (!(p->p_flag & P_CONTROLT)) {
|
|
PROC_UNLOCK(p);
|
|
return (error);
|
|
}
|
|
if (p->p_session->s_ttydp == de->de_cdp)
|
|
error = 0;
|
|
PROC_UNLOCK(p);
|
|
return (error);
|
|
}
|
|
|
|
_Static_assert(((FMASK | FCNTLFLAGS) & (FLASTCLOSE | FREVOKE)) == 0,
|
|
"devfs-only flag reuse failed");
|
|
|
|
static int
|
|
devfs_close(struct vop_close_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp, *oldvp;
|
|
struct thread *td = ap->a_td;
|
|
struct proc *p;
|
|
struct cdev *dev = vp->v_rdev;
|
|
struct cdevsw *dsw;
|
|
int dflags, error, ref, vp_locked;
|
|
|
|
/*
|
|
* XXX: Don't call d_close() if we were called because of
|
|
* XXX: insmntque1() failure.
|
|
*/
|
|
if (vp->v_data == NULL)
|
|
return (0);
|
|
|
|
/*
|
|
* Hack: a tty device that is a controlling terminal
|
|
* has a reference from the session structure.
|
|
* We cannot easily tell that a character device is
|
|
* a controlling terminal, unless it is the closing
|
|
* process' controlling terminal. In that case,
|
|
* if the reference count is 2 (this last descriptor
|
|
* plus the session), release the reference from the session.
|
|
*/
|
|
if (td != NULL) {
|
|
p = td->td_proc;
|
|
PROC_LOCK(p);
|
|
if (vp == p->p_session->s_ttyvp) {
|
|
PROC_UNLOCK(p);
|
|
oldvp = NULL;
|
|
sx_xlock(&proctree_lock);
|
|
if (vp == p->p_session->s_ttyvp) {
|
|
SESS_LOCK(p->p_session);
|
|
VI_LOCK(vp);
|
|
if (count_dev(dev) == 2 &&
|
|
(vp->v_iflag & VI_DOOMED) == 0) {
|
|
p->p_session->s_ttyvp = NULL;
|
|
p->p_session->s_ttydp = NULL;
|
|
oldvp = vp;
|
|
}
|
|
VI_UNLOCK(vp);
|
|
SESS_UNLOCK(p->p_session);
|
|
}
|
|
sx_xunlock(&proctree_lock);
|
|
if (oldvp != NULL)
|
|
vrele(oldvp);
|
|
} else
|
|
PROC_UNLOCK(p);
|
|
}
|
|
/*
|
|
* We do not want to really close the device if it
|
|
* is still in use unless we are trying to close it
|
|
* forcibly. Since every use (buffer, vnode, swap, cmap)
|
|
* holds a reference to the vnode, and because we mark
|
|
* any other vnodes that alias this device, when the
|
|
* sum of the reference counts on all the aliased
|
|
* vnodes descends to one, we are on last close.
|
|
*/
|
|
dsw = dev_refthread(dev, &ref);
|
|
if (dsw == NULL)
|
|
return (ENXIO);
|
|
dflags = 0;
|
|
VI_LOCK(vp);
|
|
if (vp->v_iflag & VI_DOOMED) {
|
|
/* Forced close. */
|
|
dflags |= FREVOKE | FNONBLOCK;
|
|
} else if (dsw->d_flags & D_TRACKCLOSE) {
|
|
/* Keep device updated on status. */
|
|
} else if (count_dev(dev) > 1) {
|
|
VI_UNLOCK(vp);
|
|
dev_relthread(dev, ref);
|
|
return (0);
|
|
}
|
|
if (count_dev(dev) == 1)
|
|
dflags |= FLASTCLOSE;
|
|
vholdl(vp);
|
|
VI_UNLOCK(vp);
|
|
vp_locked = VOP_ISLOCKED(vp);
|
|
VOP_UNLOCK(vp, 0);
|
|
KASSERT(dev->si_refcount > 0,
|
|
("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev)));
|
|
error = dsw->d_close(dev, ap->a_fflag | dflags, S_IFCHR, td);
|
|
dev_relthread(dev, ref);
|
|
vn_lock(vp, vp_locked | LK_RETRY);
|
|
vdrop(vp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_close_f(struct file *fp, struct thread *td)
|
|
{
|
|
int error;
|
|
struct file *fpop;
|
|
|
|
/*
|
|
* NB: td may be NULL if this descriptor is closed due to
|
|
* garbage collection from a closed UNIX domain socket.
|
|
*/
|
|
fpop = curthread->td_fpop;
|
|
curthread->td_fpop = fp;
|
|
error = vnops.fo_close(fp, td);
|
|
curthread->td_fpop = fpop;
|
|
|
|
/*
|
|
* The f_cdevpriv cannot be assigned non-NULL value while we
|
|
* are destroying the file.
|
|
*/
|
|
if (fp->f_cdevpriv != NULL)
|
|
devfs_fpdrop(fp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_fsync(struct vop_fsync_args *ap)
|
|
{
|
|
int error;
|
|
struct bufobj *bo;
|
|
struct devfs_dirent *de;
|
|
|
|
if (!vn_isdisk(ap->a_vp, &error)) {
|
|
bo = &ap->a_vp->v_bufobj;
|
|
de = ap->a_vp->v_data;
|
|
if (error == ENXIO && bo->bo_dirty.bv_cnt > 0) {
|
|
printf("Device %s went missing before all of the data "
|
|
"could be written to it; expect data loss.\n",
|
|
de->de_dirent->d_name);
|
|
|
|
error = vop_stdfsync(ap);
|
|
if (bo->bo_dirty.bv_cnt != 0 || error != 0)
|
|
panic("devfs_fsync: vop_stdfsync failed.");
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
return (vop_stdfsync(ap));
|
|
}
|
|
|
|
static int
|
|
devfs_getattr(struct vop_getattr_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vattr *vap = ap->a_vap;
|
|
int error;
|
|
struct devfs_dirent *de;
|
|
struct devfs_mount *dmp;
|
|
struct cdev *dev;
|
|
|
|
error = devfs_populate_vp(vp);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
dmp = VFSTODEVFS(vp->v_mount);
|
|
sx_xunlock(&dmp->dm_lock);
|
|
|
|
de = vp->v_data;
|
|
KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp));
|
|
if (vp->v_type == VDIR) {
|
|
de = de->de_dir;
|
|
KASSERT(de != NULL,
|
|
("Null dir dirent in devfs_getattr vp=%p", vp));
|
|
}
|
|
vap->va_uid = de->de_uid;
|
|
vap->va_gid = de->de_gid;
|
|
vap->va_mode = de->de_mode;
|
|
if (vp->v_type == VLNK)
|
|
vap->va_size = strlen(de->de_symlink);
|
|
else if (vp->v_type == VDIR)
|
|
vap->va_size = vap->va_bytes = DEV_BSIZE;
|
|
else
|
|
vap->va_size = 0;
|
|
if (vp->v_type != VDIR)
|
|
vap->va_bytes = 0;
|
|
vap->va_blocksize = DEV_BSIZE;
|
|
vap->va_type = vp->v_type;
|
|
|
|
#define fix(aa) \
|
|
do { \
|
|
if ((aa).tv_sec <= 3600) { \
|
|
(aa).tv_sec = boottime.tv_sec; \
|
|
(aa).tv_nsec = boottime.tv_usec * 1000; \
|
|
} \
|
|
} while (0)
|
|
|
|
if (vp->v_type != VCHR) {
|
|
fix(de->de_atime);
|
|
vap->va_atime = de->de_atime;
|
|
fix(de->de_mtime);
|
|
vap->va_mtime = de->de_mtime;
|
|
fix(de->de_ctime);
|
|
vap->va_ctime = de->de_ctime;
|
|
} else {
|
|
dev = vp->v_rdev;
|
|
fix(dev->si_atime);
|
|
vap->va_atime = dev->si_atime;
|
|
fix(dev->si_mtime);
|
|
vap->va_mtime = dev->si_mtime;
|
|
fix(dev->si_ctime);
|
|
vap->va_ctime = dev->si_ctime;
|
|
|
|
vap->va_rdev = cdev2priv(dev)->cdp_inode;
|
|
}
|
|
vap->va_gen = 0;
|
|
vap->va_flags = 0;
|
|
vap->va_filerev = 0;
|
|
vap->va_nlink = de->de_links;
|
|
vap->va_fileid = de->de_inode;
|
|
|
|
return (error);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
devfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td)
|
|
{
|
|
struct cdev *dev;
|
|
struct cdevsw *dsw;
|
|
struct vnode *vp;
|
|
struct vnode *vpold;
|
|
int error, i, ref;
|
|
const char *p;
|
|
struct fiodgname_arg *fgn;
|
|
struct file *fpop;
|
|
|
|
fpop = td->td_fpop;
|
|
error = devfs_fp_check(fp, &dev, &dsw, &ref);
|
|
if (error != 0) {
|
|
error = vnops.fo_ioctl(fp, com, data, cred, td);
|
|
return (error);
|
|
}
|
|
|
|
if (com == FIODTYPE) {
|
|
*(int *)data = dsw->d_flags & D_TYPEMASK;
|
|
td->td_fpop = fpop;
|
|
dev_relthread(dev, ref);
|
|
return (0);
|
|
} else if (com == FIODGNAME) {
|
|
fgn = data;
|
|
p = devtoname(dev);
|
|
i = strlen(p) + 1;
|
|
if (i > fgn->len)
|
|
error = EINVAL;
|
|
else
|
|
error = copyout(p, fgn->buf, i);
|
|
td->td_fpop = fpop;
|
|
dev_relthread(dev, ref);
|
|
return (error);
|
|
}
|
|
error = dsw->d_ioctl(dev, com, data, fp->f_flag, td);
|
|
td->td_fpop = NULL;
|
|
dev_relthread(dev, ref);
|
|
if (error == ENOIOCTL)
|
|
error = ENOTTY;
|
|
if (error == 0 && com == TIOCSCTTY) {
|
|
vp = fp->f_vnode;
|
|
|
|
/* Do nothing if reassigning same control tty */
|
|
sx_slock(&proctree_lock);
|
|
if (td->td_proc->p_session->s_ttyvp == vp) {
|
|
sx_sunlock(&proctree_lock);
|
|
return (0);
|
|
}
|
|
|
|
vpold = td->td_proc->p_session->s_ttyvp;
|
|
VREF(vp);
|
|
SESS_LOCK(td->td_proc->p_session);
|
|
td->td_proc->p_session->s_ttyvp = vp;
|
|
td->td_proc->p_session->s_ttydp = cdev2priv(dev);
|
|
SESS_UNLOCK(td->td_proc->p_session);
|
|
|
|
sx_sunlock(&proctree_lock);
|
|
|
|
/* Get rid of reference to old control tty */
|
|
if (vpold)
|
|
vrele(vpold);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
devfs_kqfilter_f(struct file *fp, struct knote *kn)
|
|
{
|
|
struct cdev *dev;
|
|
struct cdevsw *dsw;
|
|
int error, ref;
|
|
struct file *fpop;
|
|
struct thread *td;
|
|
|
|
td = curthread;
|
|
fpop = td->td_fpop;
|
|
error = devfs_fp_check(fp, &dev, &dsw, &ref);
|
|
if (error)
|
|
return (error);
|
|
error = dsw->d_kqfilter(dev, kn);
|
|
td->td_fpop = fpop;
|
|
dev_relthread(dev, ref);
|
|
return (error);
|
|
}
|
|
|
|
static inline int
|
|
devfs_prison_check(struct devfs_dirent *de, struct thread *td)
|
|
{
|
|
struct cdev_priv *cdp;
|
|
struct ucred *dcr;
|
|
struct proc *p;
|
|
int error;
|
|
|
|
cdp = de->de_cdp;
|
|
if (cdp == NULL)
|
|
return (0);
|
|
dcr = cdp->cdp_c.si_cred;
|
|
if (dcr == NULL)
|
|
return (0);
|
|
|
|
error = prison_check(td->td_ucred, dcr);
|
|
if (error == 0)
|
|
return (0);
|
|
/* We do, however, allow access to the controlling terminal */
|
|
p = td->td_proc;
|
|
PROC_LOCK(p);
|
|
if (!(p->p_flag & P_CONTROLT)) {
|
|
PROC_UNLOCK(p);
|
|
return (error);
|
|
}
|
|
if (p->p_session->s_ttydp == cdp)
|
|
error = 0;
|
|
PROC_UNLOCK(p);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock)
|
|
{
|
|
struct componentname *cnp;
|
|
struct vnode *dvp, **vpp;
|
|
struct thread *td;
|
|
struct devfs_dirent *de, *dd;
|
|
struct devfs_dirent **dde;
|
|
struct devfs_mount *dmp;
|
|
struct cdev *cdev;
|
|
int error, flags, nameiop, dvplocked;
|
|
char specname[SPECNAMELEN + 1], *pname;
|
|
|
|
cnp = ap->a_cnp;
|
|
vpp = ap->a_vpp;
|
|
dvp = ap->a_dvp;
|
|
pname = cnp->cn_nameptr;
|
|
td = cnp->cn_thread;
|
|
flags = cnp->cn_flags;
|
|
nameiop = cnp->cn_nameiop;
|
|
dmp = VFSTODEVFS(dvp->v_mount);
|
|
dd = dvp->v_data;
|
|
*vpp = NULLVP;
|
|
|
|
if ((flags & ISLASTCN) && nameiop == RENAME)
|
|
return (EOPNOTSUPP);
|
|
|
|
if (dvp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
|
|
if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
|
|
return (EIO);
|
|
|
|
error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (cnp->cn_namelen == 1 && *pname == '.') {
|
|
if ((flags & ISLASTCN) && nameiop != LOOKUP)
|
|
return (EINVAL);
|
|
*vpp = dvp;
|
|
VREF(dvp);
|
|
return (0);
|
|
}
|
|
|
|
if (flags & ISDOTDOT) {
|
|
if ((flags & ISLASTCN) && nameiop != LOOKUP)
|
|
return (EINVAL);
|
|
de = devfs_parent_dirent(dd);
|
|
if (de == NULL)
|
|
return (ENOENT);
|
|
dvplocked = VOP_ISLOCKED(dvp);
|
|
VOP_UNLOCK(dvp, 0);
|
|
error = devfs_allocv(de, dvp->v_mount,
|
|
cnp->cn_lkflags & LK_TYPE_MASK, vpp);
|
|
*dm_unlock = 0;
|
|
vn_lock(dvp, dvplocked | LK_RETRY);
|
|
return (error);
|
|
}
|
|
|
|
dd = dvp->v_data;
|
|
de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0);
|
|
while (de == NULL) { /* While(...) so we can use break */
|
|
|
|
if (nameiop == DELETE)
|
|
return (ENOENT);
|
|
|
|
/*
|
|
* OK, we didn't have an entry for the name we were asked for
|
|
* so we try to see if anybody can create it on demand.
|
|
*/
|
|
pname = devfs_fqpn(specname, dmp, dd, cnp);
|
|
if (pname == NULL)
|
|
break;
|
|
|
|
cdev = NULL;
|
|
DEVFS_DMP_HOLD(dmp);
|
|
sx_xunlock(&dmp->dm_lock);
|
|
sx_slock(&clone_drain_lock);
|
|
EVENTHANDLER_INVOKE(dev_clone,
|
|
td->td_ucred, pname, strlen(pname), &cdev);
|
|
sx_sunlock(&clone_drain_lock);
|
|
|
|
if (cdev == NULL)
|
|
sx_xlock(&dmp->dm_lock);
|
|
else if (devfs_populate_vp(dvp) != 0) {
|
|
*dm_unlock = 0;
|
|
sx_xlock(&dmp->dm_lock);
|
|
if (DEVFS_DMP_DROP(dmp)) {
|
|
sx_xunlock(&dmp->dm_lock);
|
|
devfs_unmount_final(dmp);
|
|
} else
|
|
sx_xunlock(&dmp->dm_lock);
|
|
dev_rel(cdev);
|
|
return (ENOENT);
|
|
}
|
|
if (DEVFS_DMP_DROP(dmp)) {
|
|
*dm_unlock = 0;
|
|
sx_xunlock(&dmp->dm_lock);
|
|
devfs_unmount_final(dmp);
|
|
if (cdev != NULL)
|
|
dev_rel(cdev);
|
|
return (ENOENT);
|
|
}
|
|
|
|
if (cdev == NULL)
|
|
break;
|
|
|
|
dev_lock();
|
|
dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx];
|
|
if (dde != NULL && *dde != NULL)
|
|
de = *dde;
|
|
dev_unlock();
|
|
dev_rel(cdev);
|
|
break;
|
|
}
|
|
|
|
if (de == NULL || de->de_flags & DE_WHITEOUT) {
|
|
if ((nameiop == CREATE || nameiop == RENAME) &&
|
|
(flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
|
|
cnp->cn_flags |= SAVENAME;
|
|
return (EJUSTRETURN);
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
|
|
if (devfs_prison_check(de, td))
|
|
return (ENOENT);
|
|
|
|
if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
|
|
error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
|
|
if (error)
|
|
return (error);
|
|
if (*vpp == dvp) {
|
|
VREF(dvp);
|
|
*vpp = dvp;
|
|
return (0);
|
|
}
|
|
}
|
|
error = devfs_allocv(de, dvp->v_mount, cnp->cn_lkflags & LK_TYPE_MASK,
|
|
vpp);
|
|
*dm_unlock = 0;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_lookup(struct vop_lookup_args *ap)
|
|
{
|
|
int j;
|
|
struct devfs_mount *dmp;
|
|
int dm_unlock;
|
|
|
|
if (devfs_populate_vp(ap->a_dvp) != 0)
|
|
return (ENOTDIR);
|
|
|
|
dmp = VFSTODEVFS(ap->a_dvp->v_mount);
|
|
dm_unlock = 1;
|
|
j = devfs_lookupx(ap, &dm_unlock);
|
|
if (dm_unlock == 1)
|
|
sx_xunlock(&dmp->dm_lock);
|
|
return (j);
|
|
}
|
|
|
|
static int
|
|
devfs_mknod(struct vop_mknod_args *ap)
|
|
{
|
|
struct componentname *cnp;
|
|
struct vnode *dvp, **vpp;
|
|
struct devfs_dirent *dd, *de;
|
|
struct devfs_mount *dmp;
|
|
int error;
|
|
|
|
/*
|
|
* The only type of node we should be creating here is a
|
|
* character device, for anything else return EOPNOTSUPP.
|
|
*/
|
|
if (ap->a_vap->va_type != VCHR)
|
|
return (EOPNOTSUPP);
|
|
dvp = ap->a_dvp;
|
|
dmp = VFSTODEVFS(dvp->v_mount);
|
|
|
|
cnp = ap->a_cnp;
|
|
vpp = ap->a_vpp;
|
|
dd = dvp->v_data;
|
|
|
|
error = ENOENT;
|
|
sx_xlock(&dmp->dm_lock);
|
|
TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
|
|
if (cnp->cn_namelen != de->de_dirent->d_namlen)
|
|
continue;
|
|
if (de->de_dirent->d_type == DT_CHR &&
|
|
(de->de_cdp->cdp_flags & CDP_ACTIVE) == 0)
|
|
continue;
|
|
if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
|
|
de->de_dirent->d_namlen) != 0)
|
|
continue;
|
|
if (de->de_flags & DE_WHITEOUT)
|
|
break;
|
|
goto notfound;
|
|
}
|
|
if (de == NULL)
|
|
goto notfound;
|
|
de->de_flags &= ~DE_WHITEOUT;
|
|
error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp);
|
|
return (error);
|
|
notfound:
|
|
sx_xunlock(&dmp->dm_lock);
|
|
return (error);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
devfs_open(struct vop_open_args *ap)
|
|
{
|
|
struct thread *td = ap->a_td;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct cdev *dev = vp->v_rdev;
|
|
struct file *fp = ap->a_fp;
|
|
int error, ref, vlocked;
|
|
struct cdevsw *dsw;
|
|
struct file *fpop;
|
|
struct mtx *mtxp;
|
|
|
|
if (vp->v_type == VBLK)
|
|
return (ENXIO);
|
|
|
|
if (dev == NULL)
|
|
return (ENXIO);
|
|
|
|
/* Make this field valid before any I/O in d_open. */
|
|
if (dev->si_iosize_max == 0)
|
|
dev->si_iosize_max = DFLTPHYS;
|
|
|
|
dsw = dev_refthread(dev, &ref);
|
|
if (dsw == NULL)
|
|
return (ENXIO);
|
|
if (fp == NULL && dsw->d_fdopen != NULL) {
|
|
dev_relthread(dev, ref);
|
|
return (ENXIO);
|
|
}
|
|
|
|
vlocked = VOP_ISLOCKED(vp);
|
|
VOP_UNLOCK(vp, 0);
|
|
|
|
fpop = td->td_fpop;
|
|
td->td_fpop = fp;
|
|
if (fp != NULL) {
|
|
fp->f_data = dev;
|
|
fp->f_vnode = vp;
|
|
}
|
|
if (dsw->d_fdopen != NULL)
|
|
error = dsw->d_fdopen(dev, ap->a_mode, td, fp);
|
|
else
|
|
error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
|
|
/* Clean up any cdevpriv upon error. */
|
|
if (error != 0)
|
|
devfs_clear_cdevpriv();
|
|
td->td_fpop = fpop;
|
|
|
|
vn_lock(vp, vlocked | LK_RETRY);
|
|
dev_relthread(dev, ref);
|
|
if (error != 0) {
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
return (error);
|
|
}
|
|
|
|
#if 0 /* /dev/console */
|
|
KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp"));
|
|
#else
|
|
if (fp == NULL)
|
|
return (error);
|
|
#endif
|
|
if (fp->f_ops == &badfileops)
|
|
finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
|
|
mtxp = mtx_pool_find(mtxpool_sleep, fp);
|
|
|
|
/*
|
|
* Hint to the dofilewrite() to not force the buffer draining
|
|
* on the writer to the file. Most likely, the write would
|
|
* not need normal buffers.
|
|
*/
|
|
mtx_lock(mtxp);
|
|
fp->f_vnread_flags |= FDEVFS_VNODE;
|
|
mtx_unlock(mtxp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_pathconf(struct vop_pathconf_args *ap)
|
|
{
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_MAC_PRESENT:
|
|
#ifdef MAC
|
|
/*
|
|
* If MAC is enabled, devfs automatically supports
|
|
* trivial non-persistant label storage.
|
|
*/
|
|
*ap->a_retval = 1;
|
|
#else
|
|
*ap->a_retval = 0;
|
|
#endif
|
|
return (0);
|
|
default:
|
|
return (vop_stdpathconf(ap));
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
devfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td)
|
|
{
|
|
struct cdev *dev;
|
|
struct cdevsw *dsw;
|
|
int error, ref;
|
|
struct file *fpop;
|
|
|
|
fpop = td->td_fpop;
|
|
error = devfs_fp_check(fp, &dev, &dsw, &ref);
|
|
if (error != 0) {
|
|
error = vnops.fo_poll(fp, events, cred, td);
|
|
return (error);
|
|
}
|
|
error = dsw->d_poll(dev, events, td);
|
|
td->td_fpop = fpop;
|
|
dev_relthread(dev, ref);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a special device vnode.
|
|
*/
|
|
static int
|
|
devfs_print(struct vop_print_args *ap)
|
|
{
|
|
|
|
printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev));
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
devfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred,
|
|
int flags, struct thread *td)
|
|
{
|
|
struct cdev *dev;
|
|
int ioflag, error, ref;
|
|
ssize_t resid;
|
|
struct cdevsw *dsw;
|
|
struct file *fpop;
|
|
|
|
if (uio->uio_resid > DEVFS_IOSIZE_MAX)
|
|
return (EINVAL);
|
|
fpop = td->td_fpop;
|
|
error = devfs_fp_check(fp, &dev, &dsw, &ref);
|
|
if (error != 0) {
|
|
error = vnops.fo_read(fp, uio, cred, flags, td);
|
|
return (error);
|
|
}
|
|
resid = uio->uio_resid;
|
|
ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT);
|
|
if (ioflag & O_DIRECT)
|
|
ioflag |= IO_DIRECT;
|
|
|
|
foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
|
|
error = dsw->d_read(dev, uio, ioflag);
|
|
if (uio->uio_resid != resid || (error == 0 && resid != 0))
|
|
devfs_timestamp(&dev->si_atime);
|
|
td->td_fpop = fpop;
|
|
dev_relthread(dev, ref);
|
|
|
|
foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_readdir(struct vop_readdir_args *ap)
|
|
{
|
|
int error;
|
|
struct uio *uio;
|
|
struct dirent *dp;
|
|
struct devfs_dirent *dd;
|
|
struct devfs_dirent *de;
|
|
struct devfs_mount *dmp;
|
|
off_t off;
|
|
int *tmp_ncookies = NULL;
|
|
|
|
if (ap->a_vp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
|
|
uio = ap->a_uio;
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* XXX: This is a temporary hack to get around this filesystem not
|
|
* supporting cookies. We store the location of the ncookies pointer
|
|
* in a temporary variable before calling vfs_subr.c:vfs_read_dirent()
|
|
* and set the number of cookies to 0. We then set the pointer to
|
|
* NULL so that vfs_read_dirent doesn't try to call realloc() on
|
|
* ap->a_cookies. Later in this function, we restore the ap->a_ncookies
|
|
* pointer to its original location before returning to the caller.
|
|
*/
|
|
if (ap->a_ncookies != NULL) {
|
|
tmp_ncookies = ap->a_ncookies;
|
|
*ap->a_ncookies = 0;
|
|
ap->a_ncookies = NULL;
|
|
}
|
|
|
|
dmp = VFSTODEVFS(ap->a_vp->v_mount);
|
|
if (devfs_populate_vp(ap->a_vp) != 0) {
|
|
if (tmp_ncookies != NULL)
|
|
ap->a_ncookies = tmp_ncookies;
|
|
return (EIO);
|
|
}
|
|
error = 0;
|
|
de = ap->a_vp->v_data;
|
|
off = 0;
|
|
TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
|
|
KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__));
|
|
if (dd->de_flags & (DE_COVERED | DE_WHITEOUT))
|
|
continue;
|
|
if (devfs_prison_check(dd, uio->uio_td))
|
|
continue;
|
|
if (dd->de_dirent->d_type == DT_DIR)
|
|
de = dd->de_dir;
|
|
else
|
|
de = dd;
|
|
dp = dd->de_dirent;
|
|
if (dp->d_reclen > uio->uio_resid)
|
|
break;
|
|
dp->d_fileno = de->de_inode;
|
|
if (off >= uio->uio_offset) {
|
|
error = vfs_read_dirent(ap, dp, off);
|
|
if (error)
|
|
break;
|
|
}
|
|
off += dp->d_reclen;
|
|
}
|
|
sx_xunlock(&dmp->dm_lock);
|
|
uio->uio_offset = off;
|
|
|
|
/*
|
|
* Restore ap->a_ncookies if it wasn't originally NULL in the first
|
|
* place.
|
|
*/
|
|
if (tmp_ncookies != NULL)
|
|
ap->a_ncookies = tmp_ncookies;
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_readlink(struct vop_readlink_args *ap)
|
|
{
|
|
struct devfs_dirent *de;
|
|
|
|
de = ap->a_vp->v_data;
|
|
return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio));
|
|
}
|
|
|
|
static int
|
|
devfs_reclaim(struct vop_reclaim_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct devfs_dirent *de;
|
|
struct cdev *dev;
|
|
|
|
mtx_lock(&devfs_de_interlock);
|
|
de = vp->v_data;
|
|
if (de != NULL) {
|
|
de->de_vnode = NULL;
|
|
vp->v_data = NULL;
|
|
}
|
|
mtx_unlock(&devfs_de_interlock);
|
|
|
|
vnode_destroy_vobject(vp);
|
|
|
|
VI_LOCK(vp);
|
|
dev_lock();
|
|
dev = vp->v_rdev;
|
|
vp->v_rdev = NULL;
|
|
|
|
if (dev == NULL) {
|
|
dev_unlock();
|
|
VI_UNLOCK(vp);
|
|
return (0);
|
|
}
|
|
|
|
dev->si_usecount -= vp->v_usecount;
|
|
dev_unlock();
|
|
VI_UNLOCK(vp);
|
|
dev_rel(dev);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
devfs_remove(struct vop_remove_args *ap)
|
|
{
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct devfs_dirent *dd;
|
|
struct devfs_dirent *de, *de_covered;
|
|
struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
|
|
|
|
ASSERT_VOP_ELOCKED(dvp, "devfs_remove");
|
|
ASSERT_VOP_ELOCKED(vp, "devfs_remove");
|
|
|
|
sx_xlock(&dmp->dm_lock);
|
|
dd = ap->a_dvp->v_data;
|
|
de = vp->v_data;
|
|
if (de->de_cdp == NULL) {
|
|
TAILQ_REMOVE(&dd->de_dlist, de, de_list);
|
|
if (de->de_dirent->d_type == DT_LNK) {
|
|
de_covered = devfs_find(dd, de->de_dirent->d_name,
|
|
de->de_dirent->d_namlen, 0);
|
|
if (de_covered != NULL)
|
|
de_covered->de_flags &= ~DE_COVERED;
|
|
}
|
|
/* We need to unlock dvp because devfs_delete() may lock it. */
|
|
VOP_UNLOCK(vp, 0);
|
|
if (dvp != vp)
|
|
VOP_UNLOCK(dvp, 0);
|
|
devfs_delete(dmp, de, 0);
|
|
sx_xunlock(&dmp->dm_lock);
|
|
if (dvp != vp)
|
|
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
} else {
|
|
de->de_flags |= DE_WHITEOUT;
|
|
sx_xunlock(&dmp->dm_lock);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Revoke is called on a tty when a terminal session ends. The vnode
|
|
* is orphaned by setting v_op to deadfs so we need to let go of it
|
|
* as well so that we create a new one next time around.
|
|
*
|
|
*/
|
|
static int
|
|
devfs_revoke(struct vop_revoke_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp, *vp2;
|
|
struct cdev *dev;
|
|
struct cdev_priv *cdp;
|
|
struct devfs_dirent *de;
|
|
u_int i;
|
|
|
|
KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL"));
|
|
|
|
dev = vp->v_rdev;
|
|
cdp = cdev2priv(dev);
|
|
|
|
dev_lock();
|
|
cdp->cdp_inuse++;
|
|
dev_unlock();
|
|
|
|
vhold(vp);
|
|
vgone(vp);
|
|
vdrop(vp);
|
|
|
|
VOP_UNLOCK(vp,0);
|
|
loop:
|
|
for (;;) {
|
|
mtx_lock(&devfs_de_interlock);
|
|
dev_lock();
|
|
vp2 = NULL;
|
|
for (i = 0; i <= cdp->cdp_maxdirent; i++) {
|
|
de = cdp->cdp_dirents[i];
|
|
if (de == NULL)
|
|
continue;
|
|
|
|
vp2 = de->de_vnode;
|
|
if (vp2 != NULL) {
|
|
dev_unlock();
|
|
VI_LOCK(vp2);
|
|
mtx_unlock(&devfs_de_interlock);
|
|
if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK,
|
|
curthread))
|
|
goto loop;
|
|
vhold(vp2);
|
|
vgone(vp2);
|
|
vdrop(vp2);
|
|
vput(vp2);
|
|
break;
|
|
}
|
|
}
|
|
if (vp2 != NULL) {
|
|
continue;
|
|
}
|
|
dev_unlock();
|
|
mtx_unlock(&devfs_de_interlock);
|
|
break;
|
|
}
|
|
dev_lock();
|
|
cdp->cdp_inuse--;
|
|
if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) {
|
|
TAILQ_REMOVE(&cdevp_list, cdp, cdp_list);
|
|
dev_unlock();
|
|
dev_rel(&cdp->cdp_c);
|
|
} else
|
|
dev_unlock();
|
|
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
devfs_rioctl(struct vop_ioctl_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct devfs_mount *dmp;
|
|
int error;
|
|
|
|
vp = ap->a_vp;
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
if (vp->v_iflag & VI_DOOMED) {
|
|
VOP_UNLOCK(vp, 0);
|
|
return (EBADF);
|
|
}
|
|
dmp = VFSTODEVFS(vp->v_mount);
|
|
sx_xlock(&dmp->dm_lock);
|
|
VOP_UNLOCK(vp, 0);
|
|
DEVFS_DMP_HOLD(dmp);
|
|
devfs_populate(dmp);
|
|
if (DEVFS_DMP_DROP(dmp)) {
|
|
sx_xunlock(&dmp->dm_lock);
|
|
devfs_unmount_final(dmp);
|
|
return (ENOENT);
|
|
}
|
|
error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td);
|
|
sx_xunlock(&dmp->dm_lock);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_rread(struct vop_read_args *ap)
|
|
{
|
|
|
|
if (ap->a_vp->v_type != VDIR)
|
|
return (EINVAL);
|
|
return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
|
|
}
|
|
|
|
static int
|
|
devfs_setattr(struct vop_setattr_args *ap)
|
|
{
|
|
struct devfs_dirent *de;
|
|
struct vattr *vap;
|
|
struct vnode *vp;
|
|
struct thread *td;
|
|
int c, error;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
|
|
vap = ap->a_vap;
|
|
vp = ap->a_vp;
|
|
td = curthread;
|
|
if ((vap->va_type != VNON) ||
|
|
(vap->va_nlink != VNOVAL) ||
|
|
(vap->va_fsid != VNOVAL) ||
|
|
(vap->va_fileid != VNOVAL) ||
|
|
(vap->va_blocksize != VNOVAL) ||
|
|
(vap->va_flags != VNOVAL && vap->va_flags != 0) ||
|
|
(vap->va_rdev != VNOVAL) ||
|
|
((int)vap->va_bytes != VNOVAL) ||
|
|
(vap->va_gen != VNOVAL)) {
|
|
return (EINVAL);
|
|
}
|
|
|
|
error = devfs_populate_vp(vp);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
de = vp->v_data;
|
|
if (vp->v_type == VDIR)
|
|
de = de->de_dir;
|
|
|
|
c = 0;
|
|
if (vap->va_uid == (uid_t)VNOVAL)
|
|
uid = de->de_uid;
|
|
else
|
|
uid = vap->va_uid;
|
|
if (vap->va_gid == (gid_t)VNOVAL)
|
|
gid = de->de_gid;
|
|
else
|
|
gid = vap->va_gid;
|
|
if (uid != de->de_uid || gid != de->de_gid) {
|
|
if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
|
|
(gid != de->de_gid && !groupmember(gid, ap->a_cred))) {
|
|
error = priv_check(td, PRIV_VFS_CHOWN);
|
|
if (error != 0)
|
|
goto ret;
|
|
}
|
|
de->de_uid = uid;
|
|
de->de_gid = gid;
|
|
c = 1;
|
|
}
|
|
|
|
if (vap->va_mode != (mode_t)VNOVAL) {
|
|
if (ap->a_cred->cr_uid != de->de_uid) {
|
|
error = priv_check(td, PRIV_VFS_ADMIN);
|
|
if (error != 0)
|
|
goto ret;
|
|
}
|
|
de->de_mode = vap->va_mode;
|
|
c = 1;
|
|
}
|
|
|
|
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
|
|
error = vn_utimes_perm(vp, vap, ap->a_cred, td);
|
|
if (error != 0)
|
|
goto ret;
|
|
if (vap->va_atime.tv_sec != VNOVAL) {
|
|
if (vp->v_type == VCHR)
|
|
vp->v_rdev->si_atime = vap->va_atime;
|
|
else
|
|
de->de_atime = vap->va_atime;
|
|
}
|
|
if (vap->va_mtime.tv_sec != VNOVAL) {
|
|
if (vp->v_type == VCHR)
|
|
vp->v_rdev->si_mtime = vap->va_mtime;
|
|
else
|
|
de->de_mtime = vap->va_mtime;
|
|
}
|
|
c = 1;
|
|
}
|
|
|
|
if (c) {
|
|
if (vp->v_type == VCHR)
|
|
vfs_timestamp(&vp->v_rdev->si_ctime);
|
|
else
|
|
vfs_timestamp(&de->de_mtime);
|
|
}
|
|
|
|
ret:
|
|
sx_xunlock(&VFSTODEVFS(vp->v_mount)->dm_lock);
|
|
return (error);
|
|
}
|
|
|
|
#ifdef MAC
|
|
static int
|
|
devfs_setlabel(struct vop_setlabel_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct devfs_dirent *de;
|
|
|
|
vp = ap->a_vp;
|
|
de = vp->v_data;
|
|
|
|
mac_vnode_relabel(ap->a_cred, vp, ap->a_label);
|
|
mac_devfs_update(vp->v_mount, de, vp);
|
|
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
devfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td)
|
|
{
|
|
|
|
return (vnops.fo_stat(fp, sb, cred, td));
|
|
}
|
|
|
|
static int
|
|
devfs_symlink(struct vop_symlink_args *ap)
|
|
{
|
|
int i, error;
|
|
struct devfs_dirent *dd;
|
|
struct devfs_dirent *de, *de_covered, *de_dotdot;
|
|
struct devfs_mount *dmp;
|
|
|
|
error = priv_check(curthread, PRIV_DEVFS_SYMLINK);
|
|
if (error)
|
|
return(error);
|
|
dmp = VFSTODEVFS(ap->a_dvp->v_mount);
|
|
if (devfs_populate_vp(ap->a_dvp) != 0)
|
|
return (ENOENT);
|
|
|
|
dd = ap->a_dvp->v_data;
|
|
de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
|
|
de->de_flags = DE_USER;
|
|
de->de_uid = 0;
|
|
de->de_gid = 0;
|
|
de->de_mode = 0755;
|
|
de->de_inode = alloc_unr(devfs_inos);
|
|
de->de_dir = dd;
|
|
de->de_dirent->d_type = DT_LNK;
|
|
i = strlen(ap->a_target) + 1;
|
|
de->de_symlink = malloc(i, M_DEVFS, M_WAITOK);
|
|
bcopy(ap->a_target, de->de_symlink, i);
|
|
#ifdef MAC
|
|
mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
|
|
#endif
|
|
de_covered = devfs_find(dd, de->de_dirent->d_name,
|
|
de->de_dirent->d_namlen, 0);
|
|
if (de_covered != NULL) {
|
|
if ((de_covered->de_flags & DE_USER) != 0) {
|
|
devfs_delete(dmp, de, DEVFS_DEL_NORECURSE);
|
|
sx_xunlock(&dmp->dm_lock);
|
|
return (EEXIST);
|
|
}
|
|
KASSERT((de_covered->de_flags & DE_COVERED) == 0,
|
|
("devfs_symlink: entry %p already covered", de_covered));
|
|
de_covered->de_flags |= DE_COVERED;
|
|
}
|
|
|
|
de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */
|
|
de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */
|
|
TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list);
|
|
devfs_dir_ref_de(dmp, dd);
|
|
devfs_rules_apply(dmp, de);
|
|
|
|
return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp));
|
|
}
|
|
|
|
static int
|
|
devfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td)
|
|
{
|
|
|
|
return (vnops.fo_truncate(fp, length, cred, td));
|
|
}
|
|
|
|
static int
|
|
devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred,
|
|
int flags, struct thread *td)
|
|
{
|
|
struct cdev *dev;
|
|
int error, ioflag, ref;
|
|
ssize_t resid;
|
|
struct cdevsw *dsw;
|
|
struct file *fpop;
|
|
|
|
if (uio->uio_resid > DEVFS_IOSIZE_MAX)
|
|
return (EINVAL);
|
|
fpop = td->td_fpop;
|
|
error = devfs_fp_check(fp, &dev, &dsw, &ref);
|
|
if (error != 0) {
|
|
error = vnops.fo_write(fp, uio, cred, flags, td);
|
|
return (error);
|
|
}
|
|
KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td));
|
|
ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC);
|
|
if (ioflag & O_DIRECT)
|
|
ioflag |= IO_DIRECT;
|
|
foffset_lock_uio(fp, uio, flags | FOF_NOLOCK);
|
|
|
|
resid = uio->uio_resid;
|
|
|
|
error = dsw->d_write(dev, uio, ioflag);
|
|
if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
|
|
devfs_timestamp(&dev->si_ctime);
|
|
dev->si_mtime = dev->si_ctime;
|
|
}
|
|
td->td_fpop = fpop;
|
|
dev_relthread(dev, ref);
|
|
|
|
foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
|
|
vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
|
|
struct thread *td)
|
|
{
|
|
struct cdev *dev;
|
|
struct cdevsw *dsw;
|
|
struct mount *mp;
|
|
struct vnode *vp;
|
|
struct file *fpop;
|
|
vm_object_t object;
|
|
vm_prot_t maxprot;
|
|
int error, ref;
|
|
|
|
vp = fp->f_vnode;
|
|
|
|
/*
|
|
* Ensure that file and memory protections are
|
|
* compatible.
|
|
*/
|
|
mp = vp->v_mount;
|
|
if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0)
|
|
maxprot = VM_PROT_NONE;
|
|
else
|
|
maxprot = VM_PROT_EXECUTE;
|
|
if ((fp->f_flag & FREAD) != 0)
|
|
maxprot |= VM_PROT_READ;
|
|
else if ((prot & VM_PROT_READ) != 0)
|
|
return (EACCES);
|
|
|
|
/*
|
|
* If we are sharing potential changes via MAP_SHARED and we
|
|
* are trying to get write permission although we opened it
|
|
* without asking for it, bail out.
|
|
*
|
|
* Note that most character devices always share mappings.
|
|
* The one exception is that D_MMAP_ANON devices
|
|
* (i.e. /dev/zero) permit private writable mappings.
|
|
*
|
|
* Rely on vm_mmap_cdev() to fail invalid MAP_PRIVATE requests
|
|
* as well as updating maxprot to permit writing for
|
|
* D_MMAP_ANON devices rather than doing that here.
|
|
*/
|
|
if ((flags & MAP_SHARED) != 0) {
|
|
if ((fp->f_flag & FWRITE) != 0)
|
|
maxprot |= VM_PROT_WRITE;
|
|
else if ((prot & VM_PROT_WRITE) != 0)
|
|
return (EACCES);
|
|
}
|
|
maxprot &= cap_maxprot;
|
|
|
|
fpop = td->td_fpop;
|
|
error = devfs_fp_check(fp, &dev, &dsw, &ref);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff,
|
|
&object);
|
|
td->td_fpop = fpop;
|
|
dev_relthread(dev, ref);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
|
|
foff, FALSE, td);
|
|
if (error != 0)
|
|
vm_object_deallocate(object);
|
|
return (error);
|
|
}
|
|
|
|
dev_t
|
|
dev2udev(struct cdev *x)
|
|
{
|
|
if (x == NULL)
|
|
return (NODEV);
|
|
return (cdev2priv(x)->cdp_inode);
|
|
}
|
|
|
|
static struct fileops devfs_ops_f = {
|
|
.fo_read = devfs_read_f,
|
|
.fo_write = devfs_write_f,
|
|
.fo_truncate = devfs_truncate_f,
|
|
.fo_ioctl = devfs_ioctl_f,
|
|
.fo_poll = devfs_poll_f,
|
|
.fo_kqfilter = devfs_kqfilter_f,
|
|
.fo_stat = devfs_stat_f,
|
|
.fo_close = devfs_close_f,
|
|
.fo_chmod = vn_chmod,
|
|
.fo_chown = vn_chown,
|
|
.fo_sendfile = vn_sendfile,
|
|
.fo_seek = vn_seek,
|
|
.fo_fill_kinfo = vn_fill_kinfo,
|
|
.fo_mmap = devfs_mmap_f,
|
|
.fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
|
|
};
|
|
|
|
static struct vop_vector devfs_vnodeops = {
|
|
.vop_default = &default_vnodeops,
|
|
|
|
.vop_access = devfs_access,
|
|
.vop_getattr = devfs_getattr,
|
|
.vop_ioctl = devfs_rioctl,
|
|
.vop_lookup = devfs_lookup,
|
|
.vop_mknod = devfs_mknod,
|
|
.vop_pathconf = devfs_pathconf,
|
|
.vop_read = devfs_rread,
|
|
.vop_readdir = devfs_readdir,
|
|
.vop_readlink = devfs_readlink,
|
|
.vop_reclaim = devfs_reclaim,
|
|
.vop_remove = devfs_remove,
|
|
.vop_revoke = devfs_revoke,
|
|
.vop_setattr = devfs_setattr,
|
|
#ifdef MAC
|
|
.vop_setlabel = devfs_setlabel,
|
|
#endif
|
|
.vop_symlink = devfs_symlink,
|
|
.vop_vptocnp = devfs_vptocnp,
|
|
};
|
|
|
|
static struct vop_vector devfs_specops = {
|
|
.vop_default = &default_vnodeops,
|
|
|
|
.vop_access = devfs_access,
|
|
.vop_bmap = VOP_PANIC,
|
|
.vop_close = devfs_close,
|
|
.vop_create = VOP_PANIC,
|
|
.vop_fsync = devfs_fsync,
|
|
.vop_getattr = devfs_getattr,
|
|
.vop_link = VOP_PANIC,
|
|
.vop_mkdir = VOP_PANIC,
|
|
.vop_mknod = VOP_PANIC,
|
|
.vop_open = devfs_open,
|
|
.vop_pathconf = devfs_pathconf,
|
|
.vop_poll = dead_poll,
|
|
.vop_print = devfs_print,
|
|
.vop_read = dead_read,
|
|
.vop_readdir = VOP_PANIC,
|
|
.vop_readlink = VOP_PANIC,
|
|
.vop_reallocblks = VOP_PANIC,
|
|
.vop_reclaim = devfs_reclaim,
|
|
.vop_remove = devfs_remove,
|
|
.vop_rename = VOP_PANIC,
|
|
.vop_revoke = devfs_revoke,
|
|
.vop_rmdir = VOP_PANIC,
|
|
.vop_setattr = devfs_setattr,
|
|
#ifdef MAC
|
|
.vop_setlabel = devfs_setlabel,
|
|
#endif
|
|
.vop_strategy = VOP_PANIC,
|
|
.vop_symlink = VOP_PANIC,
|
|
.vop_vptocnp = devfs_vptocnp,
|
|
.vop_write = dead_write,
|
|
};
|
|
|
|
/*
|
|
* Our calling convention to the device drivers used to be that we passed
|
|
* vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_
|
|
* flags instead since that's what open(), close() and ioctl() takes and
|
|
* we don't really want vnode.h in device drivers.
|
|
* We solved the source compatibility by redefining some vnode flags to
|
|
* be the same as the fcntl ones and by sending down the bitwise OR of
|
|
* the respective fcntl/vnode flags. These CTASSERTS make sure nobody
|
|
* pulls the rug out under this.
|
|
*/
|
|
CTASSERT(O_NONBLOCK == IO_NDELAY);
|
|
CTASSERT(O_FSYNC == IO_SYNC);
|