7077c42623
logic is now placed in the mmap hook implementation rather than requiring it to be placed in sys/vm/vm_mmap.c. This hook allows new file types to support mmap() as well as potentially allowing mmap() for existing file types that do not currently support any mapping. The vm_mmap() function is now split up into two functions. A new vm_mmap_object() function handles the "back half" of vm_mmap() and accepts a referenced VM object to map rather than a (handle, handle_type) tuple. vm_mmap() is now reduced to converting a (handle, handle_type) tuple to a a VM object and then calling vm_mmap_object() to handle the actual mapping. The vm_mmap() function remains for use by other parts of the kernel (e.g. device drivers and exec) but now only supports mapping vnodes, character devices, and anonymous memory. The mmap() system call invokes vm_mmap_object() directly with a NULL object for anonymous mappings. For mappings using a file descriptor, the descriptors fo_mmap() hook is invoked instead. The fo_mmap() hook is responsible for performing type-specific checks and adjustments to arguments as well as possibly modifying mapping parameters such as flags or the object offset. The fo_mmap() hook routines then call vm_mmap_object() to handle the actual mapping. The fo_mmap() hook is optional. If it is not set, then fo_mmap() will fail with ENODEV. A fo_mmap() hook is implemented for regular files, character devices, and shared memory objects (created via shm_open()). While here, consistently use the VM_PROT_* constants for the vm_prot_t type for the 'prot' variable passed to vm_mmap() and vm_mmap_object() as well as the vm_mmap_vnode() and vm_mmap_cdev() helper routines. Previously some places were using the mmap()-specific PROT_* constants instead. While this happens to work because PROT_xx == VM_PROT_xx, using VM_PROT_* is more correct. Differential Revision: https://reviews.freebsd.org/D2658 Reviewed by: alc (glanced over), kib MFC after: 1 month Sponsored by: Chelsio
1901 lines
43 KiB
C
1901 lines
43 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 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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/*
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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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|
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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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|
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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, cdevpriv_dtr_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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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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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 (EBADF);
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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 (EBADF);
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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 (EBADF);
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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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|
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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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|
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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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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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|
}
|
|
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;
|
|
goto finished;
|
|
}
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*buflen = i;
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de = devfs_parent_dirent(de);
|
|
if (de == NULL) {
|
|
error = ENOENT;
|
|
goto finished;
|
|
}
|
|
mtx_lock(&devfs_de_interlock);
|
|
*dvp = de->de_vnode;
|
|
if (*dvp != NULL) {
|
|
VI_LOCK(*dvp);
|
|
mtx_unlock(&devfs_de_interlock);
|
|
vholdl(*dvp);
|
|
VI_UNLOCK(*dvp);
|
|
vref(*dvp);
|
|
vdrop(*dvp);
|
|
} else {
|
|
mtx_unlock(&devfs_de_interlock);
|
|
error = ENOENT;
|
|
}
|
|
finished:
|
|
sx_xunlock(&dmp->dm_lock);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Construct the fully qualified path name relative to the mountpoint.
|
|
* If a NULL cnp is provided, no '/' is appended to the resulting path.
|
|
*/
|
|
char *
|
|
devfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd,
|
|
struct componentname *cnp)
|
|
{
|
|
int i;
|
|
struct devfs_dirent *de;
|
|
|
|
sx_assert(&dmp->dm_lock, SA_LOCKED);
|
|
|
|
i = SPECNAMELEN;
|
|
buf[i] = '\0';
|
|
if (cnp != NULL)
|
|
i -= cnp->cn_namelen;
|
|
if (i < 0)
|
|
return (NULL);
|
|
if (cnp != NULL)
|
|
bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
|
|
de = dd;
|
|
while (de != dmp->dm_rootdir) {
|
|
if (cnp != NULL || i < SPECNAMELEN) {
|
|
i--;
|
|
if (i < 0)
|
|
return (NULL);
|
|
buf[i] = '/';
|
|
}
|
|
i -= de->de_dirent->d_namlen;
|
|
if (i < 0)
|
|
return (NULL);
|
|
bcopy(de->de_dirent->d_name, buf + i,
|
|
de->de_dirent->d_namlen);
|
|
de = devfs_parent_dirent(de);
|
|
if (de == NULL)
|
|
return (NULL);
|
|
}
|
|
return (buf + i);
|
|
}
|
|
|
|
static int
|
|
devfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp,
|
|
struct devfs_dirent *de)
|
|
{
|
|
int not_found;
|
|
|
|
not_found = 0;
|
|
if (de->de_flags & DE_DOOMED)
|
|
not_found = 1;
|
|
if (DEVFS_DE_DROP(de)) {
|
|
KASSERT(not_found == 1, ("DEVFS de dropped but not doomed"));
|
|
devfs_dirent_free(de);
|
|
}
|
|
if (DEVFS_DMP_DROP(dmp)) {
|
|
KASSERT(not_found == 1,
|
|
("DEVFS mount struct freed before dirent"));
|
|
not_found = 2;
|
|
sx_xunlock(&dmp->dm_lock);
|
|
devfs_unmount_final(dmp);
|
|
}
|
|
if (not_found == 1 || (drop_dm_lock && not_found != 2))
|
|
sx_unlock(&dmp->dm_lock);
|
|
return (not_found);
|
|
}
|
|
|
|
static void
|
|
devfs_insmntque_dtr(struct vnode *vp, void *arg)
|
|
{
|
|
struct devfs_dirent *de;
|
|
|
|
de = (struct devfs_dirent *)arg;
|
|
mtx_lock(&devfs_de_interlock);
|
|
vp->v_data = NULL;
|
|
de->de_vnode = NULL;
|
|
mtx_unlock(&devfs_de_interlock);
|
|
vgone(vp);
|
|
vput(vp);
|
|
}
|
|
|
|
/*
|
|
* devfs_allocv shall be entered with dmp->dm_lock held, and it drops
|
|
* it on return.
|
|
*/
|
|
int
|
|
devfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode,
|
|
struct vnode **vpp)
|
|
{
|
|
int error;
|
|
struct vnode *vp;
|
|
struct cdev *dev;
|
|
struct devfs_mount *dmp;
|
|
struct cdevsw *dsw;
|
|
|
|
dmp = VFSTODEVFS(mp);
|
|
if (de->de_flags & DE_DOOMED) {
|
|
sx_xunlock(&dmp->dm_lock);
|
|
return (ENOENT);
|
|
}
|
|
loop:
|
|
DEVFS_DE_HOLD(de);
|
|
DEVFS_DMP_HOLD(dmp);
|
|
mtx_lock(&devfs_de_interlock);
|
|
vp = de->de_vnode;
|
|
if (vp != NULL) {
|
|
VI_LOCK(vp);
|
|
mtx_unlock(&devfs_de_interlock);
|
|
sx_xunlock(&dmp->dm_lock);
|
|
vget(vp, lockmode | LK_INTERLOCK | LK_RETRY, curthread);
|
|
sx_xlock(&dmp->dm_lock);
|
|
if (devfs_allocv_drop_refs(0, dmp, de)) {
|
|
vput(vp);
|
|
return (ENOENT);
|
|
}
|
|
else if ((vp->v_iflag & VI_DOOMED) != 0) {
|
|
mtx_lock(&devfs_de_interlock);
|
|
if (de->de_vnode == vp) {
|
|
de->de_vnode = NULL;
|
|
vp->v_data = NULL;
|
|
}
|
|
mtx_unlock(&devfs_de_interlock);
|
|
vput(vp);
|
|
goto loop;
|
|
}
|
|
sx_xunlock(&dmp->dm_lock);
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
mtx_unlock(&devfs_de_interlock);
|
|
if (de->de_dirent->d_type == DT_CHR) {
|
|
if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) {
|
|
devfs_allocv_drop_refs(1, dmp, de);
|
|
return (ENOENT);
|
|
}
|
|
dev = &de->de_cdp->cdp_c;
|
|
} else {
|
|
dev = NULL;
|
|
}
|
|
error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp);
|
|
if (error != 0) {
|
|
devfs_allocv_drop_refs(1, dmp, de);
|
|
printf("devfs_allocv: failed to allocate new vnode\n");
|
|
return (error);
|
|
}
|
|
|
|
if (de->de_dirent->d_type == DT_CHR) {
|
|
vp->v_type = VCHR;
|
|
VI_LOCK(vp);
|
|
dev_lock();
|
|
dev_refl(dev);
|
|
/* XXX: v_rdev should be protect by vnode lock */
|
|
vp->v_rdev = dev;
|
|
KASSERT(vp->v_usecount == 1,
|
|
("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount));
|
|
dev->si_usecount += vp->v_usecount;
|
|
/* Special casing of ttys for deadfs. Probably redundant. */
|
|
dsw = dev->si_devsw;
|
|
if (dsw != NULL && (dsw->d_flags & D_TTY) != 0)
|
|
vp->v_vflag |= VV_ISTTY;
|
|
dev_unlock();
|
|
VI_UNLOCK(vp);
|
|
if ((dev->si_flags & SI_ETERNAL) != 0)
|
|
vp->v_vflag |= VV_ETERNALDEV;
|
|
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);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
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 vp_locked, error, ref;
|
|
|
|
/*
|
|
* 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);
|
|
VI_LOCK(vp);
|
|
if (vp->v_iflag & VI_DOOMED) {
|
|
/* Forced close. */
|
|
} 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);
|
|
}
|
|
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, 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);
|
|
/* cleanup 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;
|
|
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);
|
|
}
|
|
|
|
de = vp->v_data;
|
|
if (vp->v_type == VDIR)
|
|
de = de->de_dir;
|
|
|
|
error = 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)
|
|
return (error);
|
|
}
|
|
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)
|
|
return (error);
|
|
}
|
|
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)
|
|
return (error);
|
|
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);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#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);
|
|
|
|
/*
|
|
* Character devices always share mappings, so
|
|
* require a writable fd for writable mappings.
|
|
*/
|
|
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,
|
|
};
|
|
|
|
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);
|