b03412ca14
are opened (was always done for block devices). This means that fstat will report the partition size and hence newfs needn't grovel into the disklabel to find the filesystem size.
826 lines
20 KiB
C
826 lines
20 KiB
C
/* $NetBSD: spec_vnops.c,v 1.70 2003/10/15 08:41:26 dsl Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)spec_vnops.c 8.15 (Berkeley) 7/14/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: spec_vnops.c,v 1.70 2003/10/15 08:41:26 dsl Exp $");
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/buf.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/stat.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/file.h>
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#include <sys/disklabel.h>
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#include <sys/lockf.h>
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#include <miscfs/genfs/genfs.h>
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#include <miscfs/specfs/specdev.h>
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/* symbolic sleep message strings for devices */
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const char devopn[] = "devopn";
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const char devio[] = "devio";
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const char devwait[] = "devwait";
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const char devin[] = "devin";
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const char devout[] = "devout";
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const char devioc[] = "devioc";
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const char devcls[] = "devcls";
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struct vnode *speclisth[SPECHSZ];
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/*
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* This vnode operations vector is used for two things only:
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* - special device nodes created from whole cloth by the kernel.
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* - as a temporary vnodeops replacement for vnodes which were found to
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* be aliased by callers of checkalias().
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* For the ops vector for vnodes built from special devices found in a
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* filesystem, see (e.g) ffs_specop_entries[] in ffs_vnops.c or the
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* equivalent for other filesystems.
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*/
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int (**spec_vnodeop_p) __P((void *));
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const struct vnodeopv_entry_desc spec_vnodeop_entries[] = {
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{ &vop_default_desc, vn_default_error },
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{ &vop_lookup_desc, spec_lookup }, /* lookup */
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{ &vop_create_desc, spec_create }, /* create */
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{ &vop_mknod_desc, spec_mknod }, /* mknod */
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{ &vop_open_desc, spec_open }, /* open */
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{ &vop_close_desc, spec_close }, /* close */
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{ &vop_access_desc, spec_access }, /* access */
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{ &vop_getattr_desc, spec_getattr }, /* getattr */
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{ &vop_setattr_desc, spec_setattr }, /* setattr */
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{ &vop_read_desc, spec_read }, /* read */
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{ &vop_write_desc, spec_write }, /* write */
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{ &vop_lease_desc, spec_lease_check }, /* lease */
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{ &vop_fcntl_desc, spec_fcntl }, /* fcntl */
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{ &vop_ioctl_desc, spec_ioctl }, /* ioctl */
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{ &vop_poll_desc, spec_poll }, /* poll */
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{ &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */
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{ &vop_revoke_desc, spec_revoke }, /* revoke */
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{ &vop_mmap_desc, spec_mmap }, /* mmap */
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{ &vop_fsync_desc, spec_fsync }, /* fsync */
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{ &vop_seek_desc, spec_seek }, /* seek */
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{ &vop_remove_desc, spec_remove }, /* remove */
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{ &vop_link_desc, spec_link }, /* link */
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{ &vop_rename_desc, spec_rename }, /* rename */
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{ &vop_mkdir_desc, spec_mkdir }, /* mkdir */
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{ &vop_rmdir_desc, spec_rmdir }, /* rmdir */
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{ &vop_symlink_desc, spec_symlink }, /* symlink */
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{ &vop_readdir_desc, spec_readdir }, /* readdir */
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{ &vop_readlink_desc, spec_readlink }, /* readlink */
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{ &vop_abortop_desc, spec_abortop }, /* abortop */
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{ &vop_inactive_desc, spec_inactive }, /* inactive */
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{ &vop_reclaim_desc, spec_reclaim }, /* reclaim */
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{ &vop_lock_desc, spec_lock }, /* lock */
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{ &vop_unlock_desc, spec_unlock }, /* unlock */
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{ &vop_bmap_desc, spec_bmap }, /* bmap */
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{ &vop_strategy_desc, spec_strategy }, /* strategy */
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{ &vop_print_desc, spec_print }, /* print */
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{ &vop_islocked_desc, spec_islocked }, /* islocked */
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{ &vop_pathconf_desc, spec_pathconf }, /* pathconf */
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{ &vop_advlock_desc, spec_advlock }, /* advlock */
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{ &vop_blkatoff_desc, spec_blkatoff }, /* blkatoff */
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{ &vop_valloc_desc, spec_valloc }, /* valloc */
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{ &vop_vfree_desc, spec_vfree }, /* vfree */
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{ &vop_truncate_desc, spec_truncate }, /* truncate */
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{ &vop_update_desc, spec_update }, /* update */
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{ &vop_bwrite_desc, spec_bwrite }, /* bwrite */
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{ &vop_getpages_desc, spec_getpages }, /* getpages */
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{ &vop_putpages_desc, spec_putpages }, /* putpages */
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{ NULL, NULL }
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};
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const struct vnodeopv_desc spec_vnodeop_opv_desc =
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{ &spec_vnodeop_p, spec_vnodeop_entries };
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/*
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* Trivial lookup routine that always fails.
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*/
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int
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spec_lookup(v)
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void *v;
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{
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struct vop_lookup_args /* {
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struct vnode *a_dvp;
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struct vnode **a_vpp;
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struct componentname *a_cnp;
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} */ *ap = v;
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*ap->a_vpp = NULL;
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return (ENOTDIR);
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}
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/*
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* Returns true if dev is /dev/mem or /dev/kmem.
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*/
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static int
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iskmemdev(dev_t dev)
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{
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/* mem_no is emitted by config(8) to generated devsw.c */
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extern const int mem_no;
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/* minor 14 is /dev/io on i386 with COMPAT_10 */
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return (major(dev) == mem_no && (minor(dev) < 2 || minor(dev) == 14));
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}
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/*
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* Open a special file.
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*/
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/* ARGSUSED */
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int
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spec_open(v)
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void *v;
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{
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struct vop_open_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap = v;
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struct proc *p = ap->a_p;
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struct vnode *bvp, *vp = ap->a_vp;
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const struct bdevsw *bdev;
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const struct cdevsw *cdev;
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dev_t blkdev, dev = (dev_t)vp->v_rdev;
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int error;
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struct partinfo pi;
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int (*d_ioctl)(dev_t, u_long, caddr_t, int, struct proc *);
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/*
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* Don't allow open if fs is mounted -nodev.
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*/
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if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV))
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return (ENXIO);
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switch (vp->v_type) {
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case VCHR:
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cdev = cdevsw_lookup(dev);
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if (cdev == NULL)
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return (ENXIO);
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if (ap->a_cred != FSCRED && (ap->a_mode & FWRITE)) {
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/*
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* When running in very secure mode, do not allow
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* opens for writing of any disk character devices.
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*/
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if (securelevel >= 2 && cdev->d_type == D_DISK)
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return (EPERM);
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/*
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* When running in secure mode, do not allow opens
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* for writing of /dev/mem, /dev/kmem, or character
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* devices whose corresponding block devices are
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* currently mounted.
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*/
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if (securelevel >= 1) {
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blkdev = devsw_chr2blk(dev);
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if (blkdev != (dev_t)NODEV &&
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vfinddev(blkdev, VBLK, &bvp) &&
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(error = vfs_mountedon(bvp)))
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return (error);
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if (iskmemdev(dev))
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return (EPERM);
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}
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}
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if (cdev->d_type == D_TTY)
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vp->v_flag |= VISTTY;
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VOP_UNLOCK(vp, 0);
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error = (*cdev->d_open)(dev, ap->a_mode, S_IFCHR, p);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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if (cdev->d_type != D_DISK)
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return error;
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d_ioctl = cdev->d_ioctl;
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break;
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case VBLK:
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bdev = bdevsw_lookup(dev);
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if (bdev == NULL)
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return (ENXIO);
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/*
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* When running in very secure mode, do not allow
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* opens for writing of any disk block devices.
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*/
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if (securelevel >= 2 && ap->a_cred != FSCRED &&
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(ap->a_mode & FWRITE) && bdev->d_type == D_DISK)
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return (EPERM);
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/*
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* Do not allow opens of block devices that are
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* currently mounted.
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*/
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if ((error = vfs_mountedon(vp)) != 0)
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return (error);
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error = (*bdev->d_open)(dev, ap->a_mode, S_IFBLK, p);
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d_ioctl = bdev->d_ioctl;
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break;
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case VNON:
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case VLNK:
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case VDIR:
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case VREG:
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case VBAD:
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case VFIFO:
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case VSOCK:
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default:
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return 0;
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}
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if (error)
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return error;
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if (!(*d_ioctl)(vp->v_rdev, DIOCGPART, (caddr_t)&pi, FREAD, curproc))
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vp->v_size = (voff_t)pi.disklab->d_secsize * pi.part->p_size;
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return 0;
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}
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/*
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* Vnode op for read
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*/
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/* ARGSUSED */
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int
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spec_read(v)
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void *v;
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{
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struct vop_read_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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struct ucred *a_cred;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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struct uio *uio = ap->a_uio;
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struct proc *p = uio->uio_procp;
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struct buf *bp;
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const struct bdevsw *bdev;
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const struct cdevsw *cdev;
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daddr_t bn;
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int bsize, bscale;
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struct partinfo dpart;
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int n, on;
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int error = 0;
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#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_READ)
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panic("spec_read mode");
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if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
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panic("spec_read proc");
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#endif
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if (uio->uio_resid == 0)
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return (0);
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switch (vp->v_type) {
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case VCHR:
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VOP_UNLOCK(vp, 0);
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cdev = cdevsw_lookup(vp->v_rdev);
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if (cdev != NULL)
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error = (*cdev->d_read)(vp->v_rdev, uio, ap->a_ioflag);
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else
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error = ENXIO;
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vn_lock(vp, LK_SHARED | LK_RETRY);
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return (error);
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case VBLK:
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if (uio->uio_offset < 0)
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return (EINVAL);
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bsize = BLKDEV_IOSIZE;
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bdev = bdevsw_lookup(vp->v_rdev);
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if (bdev != NULL &&
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(*bdev->d_ioctl)(vp->v_rdev, DIOCGPART, (caddr_t)&dpart,
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FREAD, p) == 0) {
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if (dpart.part->p_fstype == FS_BSDFFS &&
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dpart.part->p_frag != 0 && dpart.part->p_fsize != 0)
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bsize = dpart.part->p_frag *
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dpart.part->p_fsize;
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}
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bscale = bsize >> DEV_BSHIFT;
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do {
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bn = (uio->uio_offset >> DEV_BSHIFT) &~ (bscale - 1);
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on = uio->uio_offset % bsize;
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n = min((unsigned)(bsize - on), uio->uio_resid);
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error = bread(vp, bn, bsize, NOCRED, &bp);
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n = min(n, bsize - bp->b_resid);
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if (error) {
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brelse(bp);
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return (error);
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}
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error = uiomove((char *)bp->b_data + on, n, uio);
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brelse(bp);
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} while (error == 0 && uio->uio_resid > 0 && n != 0);
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return (error);
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default:
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panic("spec_read type");
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}
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/* NOTREACHED */
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}
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|
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/*
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* Vnode op for write
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*/
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/* ARGSUSED */
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int
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spec_write(v)
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void *v;
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{
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struct vop_write_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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struct ucred *a_cred;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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struct uio *uio = ap->a_uio;
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struct proc *p = uio->uio_procp;
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struct buf *bp;
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const struct bdevsw *bdev;
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const struct cdevsw *cdev;
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daddr_t bn;
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int bsize, bscale;
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struct partinfo dpart;
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int n, on;
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int error = 0;
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|
|
#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_WRITE)
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panic("spec_write mode");
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|
if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
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|
panic("spec_write proc");
|
|
#endif
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VCHR:
|
|
VOP_UNLOCK(vp, 0);
|
|
cdev = cdevsw_lookup(vp->v_rdev);
|
|
if (cdev != NULL)
|
|
error = (*cdev->d_write)(vp->v_rdev, uio, ap->a_ioflag);
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|
else
|
|
error = ENXIO;
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
return (error);
|
|
|
|
case VBLK:
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
bsize = BLKDEV_IOSIZE;
|
|
bdev = bdevsw_lookup(vp->v_rdev);
|
|
if (bdev != NULL &&
|
|
(*bdev->d_ioctl)(vp->v_rdev, DIOCGPART, (caddr_t)&dpart,
|
|
FREAD, p) == 0) {
|
|
if (dpart.part->p_fstype == FS_BSDFFS &&
|
|
dpart.part->p_frag != 0 && dpart.part->p_fsize != 0)
|
|
bsize = dpart.part->p_frag *
|
|
dpart.part->p_fsize;
|
|
}
|
|
bscale = bsize >> DEV_BSHIFT;
|
|
do {
|
|
bn = (uio->uio_offset >> DEV_BSHIFT) &~ (bscale - 1);
|
|
on = uio->uio_offset % bsize;
|
|
n = min((unsigned)(bsize - on), uio->uio_resid);
|
|
if (n == bsize)
|
|
bp = getblk(vp, bn, bsize, 0, 0);
|
|
else
|
|
error = bread(vp, bn, bsize, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
n = min(n, bsize - bp->b_resid);
|
|
error = uiomove((char *)bp->b_data + on, n, uio);
|
|
if (error)
|
|
brelse(bp);
|
|
else {
|
|
if (n + on == bsize)
|
|
bawrite(bp);
|
|
else
|
|
bdwrite(bp);
|
|
if (bp->b_flags & B_ERROR)
|
|
error = bp->b_error;
|
|
}
|
|
} while (error == 0 && uio->uio_resid > 0 && n != 0);
|
|
return (error);
|
|
|
|
default:
|
|
panic("spec_write type");
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Device ioctl operation.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_ioctl(v)
|
|
void *v;
|
|
{
|
|
struct vop_ioctl_args /* {
|
|
struct vnode *a_vp;
|
|
u_long a_command;
|
|
caddr_t a_data;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap = v;
|
|
const struct bdevsw *bdev;
|
|
const struct cdevsw *cdev;
|
|
dev_t dev = ap->a_vp->v_rdev;
|
|
|
|
switch (ap->a_vp->v_type) {
|
|
|
|
case VCHR:
|
|
cdev = cdevsw_lookup(dev);
|
|
if (cdev == NULL)
|
|
return (ENXIO);
|
|
return ((*cdev->d_ioctl)(dev, ap->a_command, ap->a_data,
|
|
ap->a_fflag, ap->a_p));
|
|
|
|
case VBLK:
|
|
bdev = bdevsw_lookup(dev);
|
|
if (bdev == NULL)
|
|
return (ENXIO);
|
|
if (ap->a_command == 0 && (long)ap->a_data == B_TAPE) {
|
|
if (bdev->d_type == D_TAPE)
|
|
return (0);
|
|
else
|
|
return (1);
|
|
}
|
|
return ((*bdev->d_ioctl)(dev, ap->a_command, ap->a_data,
|
|
ap->a_fflag, ap->a_p));
|
|
|
|
default:
|
|
panic("spec_ioctl");
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
spec_poll(v)
|
|
void *v;
|
|
{
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct proc *a_p;
|
|
} */ *ap = v;
|
|
const struct cdevsw *cdev;
|
|
dev_t dev;
|
|
|
|
switch (ap->a_vp->v_type) {
|
|
|
|
case VCHR:
|
|
dev = ap->a_vp->v_rdev;
|
|
cdev = cdevsw_lookup(dev);
|
|
if (cdev == NULL)
|
|
return (ENXIO);
|
|
return (*cdev->d_poll)(dev, ap->a_events, ap->a_p);
|
|
|
|
default:
|
|
return (genfs_poll(v));
|
|
}
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
spec_kqfilter(v)
|
|
void *v;
|
|
{
|
|
struct vop_kqfilter_args /* {
|
|
struct vnode *a_vp;
|
|
struct proc *a_kn;
|
|
} */ *ap = v;
|
|
const struct cdevsw *cdev;
|
|
dev_t dev;
|
|
|
|
switch (ap->a_vp->v_type) {
|
|
|
|
case VCHR:
|
|
dev = ap->a_vp->v_rdev;
|
|
cdev = cdevsw_lookup(dev);
|
|
if (cdev == NULL)
|
|
return (ENXIO);
|
|
return (*cdev->d_kqfilter)(dev, ap->a_kn);
|
|
default:
|
|
/*
|
|
* Block devices don't support kqfilter, and refuse it
|
|
* for any other files (like those vflush()ed) too.
|
|
*/
|
|
return (EOPNOTSUPP);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Synch buffers associated with a block device
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_fsync(v)
|
|
void *v;
|
|
{
|
|
struct vop_fsync_args /* {
|
|
struct vnode *a_vp;
|
|
struct ucred *a_cred;
|
|
int a_flags;
|
|
off_t offlo;
|
|
off_t offhi;
|
|
struct proc *a_p;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
if (vp->v_type == VBLK)
|
|
vflushbuf(vp, (ap->a_flags & FSYNC_WAIT) != 0);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Just call the device strategy routine
|
|
*/
|
|
int
|
|
spec_strategy(v)
|
|
void *v;
|
|
{
|
|
struct vop_strategy_args /* {
|
|
struct buf *a_bp;
|
|
} */ *ap = v;
|
|
struct buf *bp;
|
|
const struct bdevsw *bdev;
|
|
|
|
bp = ap->a_bp;
|
|
if (!(bp->b_flags & B_READ) &&
|
|
(LIST_FIRST(&bp->b_dep)) != NULL && bioops.io_start)
|
|
(*bioops.io_start)(bp);
|
|
bdev = bdevsw_lookup(bp->b_dev);
|
|
if (bdev != NULL)
|
|
(*bdev->d_strategy)(bp);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
spec_inactive(v)
|
|
void *v;
|
|
{
|
|
struct vop_inactive_args /* {
|
|
struct vnode *a_vp;
|
|
struct proc *a_p;
|
|
} */ *ap = v;
|
|
|
|
VOP_UNLOCK(ap->a_vp, 0);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This is a noop, simply returning what one has been given.
|
|
*/
|
|
int
|
|
spec_bmap(v)
|
|
void *v;
|
|
{
|
|
struct vop_bmap_args /* {
|
|
struct vnode *a_vp;
|
|
daddr_t a_bn;
|
|
struct vnode **a_vpp;
|
|
daddr_t *a_bnp;
|
|
int *a_runp;
|
|
} */ *ap = v;
|
|
|
|
if (ap->a_vpp != NULL)
|
|
*ap->a_vpp = ap->a_vp;
|
|
if (ap->a_bnp != NULL)
|
|
*ap->a_bnp = ap->a_bn;
|
|
if (ap->a_runp != NULL)
|
|
*ap->a_runp = (MAXBSIZE >> DEV_BSHIFT) - 1;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Device close routine
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_close(v)
|
|
void *v;
|
|
{
|
|
struct vop_close_args /* {
|
|
struct vnode *a_vp;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
const struct bdevsw *bdev;
|
|
const struct cdevsw *cdev;
|
|
dev_t dev = vp->v_rdev;
|
|
int (*devclose) __P((dev_t, int, int, struct proc *));
|
|
int mode, error, count, flags, flags1;
|
|
|
|
count = vcount(vp);
|
|
simple_lock(&vp->v_interlock);
|
|
flags = vp->v_flag;
|
|
simple_unlock(&vp->v_interlock);
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VCHR:
|
|
/*
|
|
* 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 (count == 2 && ap->a_p &&
|
|
vp == ap->a_p->p_session->s_ttyvp) {
|
|
vrele(vp);
|
|
count--;
|
|
ap->a_p->p_session->s_ttyvp = NULL;
|
|
}
|
|
/*
|
|
* If the vnode is locked, then we are in the midst
|
|
* of forcably closing the device, otherwise we only
|
|
* close on last reference.
|
|
*/
|
|
if (count > 1 && (flags & VXLOCK) == 0)
|
|
return (0);
|
|
cdev = cdevsw_lookup(dev);
|
|
if (cdev != NULL)
|
|
devclose = cdev->d_close;
|
|
else
|
|
devclose = NULL;
|
|
mode = S_IFCHR;
|
|
break;
|
|
|
|
case VBLK:
|
|
/*
|
|
* On last close of a block device (that isn't mounted)
|
|
* we must invalidate any in core blocks, so that
|
|
* we can, for instance, change floppy disks.
|
|
*/
|
|
error = vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 0, 0);
|
|
if (error)
|
|
return (error);
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (count > 1 && (flags & VXLOCK) == 0)
|
|
return (0);
|
|
bdev = bdevsw_lookup(dev);
|
|
if (bdev != NULL)
|
|
devclose = bdev->d_close;
|
|
else
|
|
devclose = NULL;
|
|
mode = S_IFBLK;
|
|
break;
|
|
|
|
default:
|
|
panic("spec_close: not special");
|
|
}
|
|
|
|
flags1 = ap->a_fflag;
|
|
|
|
/*
|
|
* if VXLOCK is set, then we're going away soon, so make this
|
|
* non-blocking. Also ensures that we won't wedge in vn_lock below.
|
|
*/
|
|
if (flags & VXLOCK)
|
|
flags1 |= FNONBLOCK;
|
|
|
|
/*
|
|
* If we're able to block, release the vnode lock & reacquire. We
|
|
* might end up sleaping for someone else who wants our queues. They
|
|
* won't get them if we hold the vnode locked. Also, if VXLOCK is set,
|
|
* don't release the lock as we won't be able to regain it.
|
|
*/
|
|
if (!(flags1 & FNONBLOCK))
|
|
VOP_UNLOCK(vp, 0);
|
|
|
|
if (devclose != NULL)
|
|
error = (*devclose)(dev, flags1, mode, ap->a_p);
|
|
else
|
|
error = ENXIO;
|
|
|
|
if (!(flags1 & FNONBLOCK))
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a special device vnode.
|
|
*/
|
|
int
|
|
spec_print(v)
|
|
void *v;
|
|
{
|
|
struct vop_print_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap = v;
|
|
|
|
printf("tag VT_NON, dev %d, %d\n", major(ap->a_vp->v_rdev),
|
|
minor(ap->a_vp->v_rdev));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return POSIX pathconf information applicable to special devices.
|
|
*/
|
|
int
|
|
spec_pathconf(v)
|
|
void *v;
|
|
{
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
register_t *a_retval;
|
|
} */ *ap = v;
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_LINK_MAX:
|
|
*ap->a_retval = LINK_MAX;
|
|
return (0);
|
|
case _PC_MAX_CANON:
|
|
*ap->a_retval = MAX_CANON;
|
|
return (0);
|
|
case _PC_MAX_INPUT:
|
|
*ap->a_retval = MAX_INPUT;
|
|
return (0);
|
|
case _PC_PIPE_BUF:
|
|
*ap->a_retval = PIPE_BUF;
|
|
return (0);
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
case _PC_VDISABLE:
|
|
*ap->a_retval = _POSIX_VDISABLE;
|
|
return (0);
|
|
case _PC_SYNC_IO:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Advisory record locking support.
|
|
*/
|
|
int
|
|
spec_advlock(v)
|
|
void *v;
|
|
{
|
|
struct vop_advlock_args /* {
|
|
struct vnode *a_vp;
|
|
caddr_t a_id;
|
|
int a_op;
|
|
struct flock *a_fl;
|
|
int a_flags;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
return lf_advlock(ap, &vp->v_speclockf, (off_t)0);
|
|
}
|