e18fda9e89
fcntl() and EOPNOTSUPP for flock(). POSIX specifies the weaker EINVAL errno and the man page agrees. Not fixed: deadfs: always returns wrong EBADF devfs, msdosfs: always return sometimes-wrong EINVAL cd9660, fdesc, kernfs, portal: always return sometimes-wrong EOPNOTSUPP procfs: always returns wrong EIO mfs: panic?! nfs: fudged NetBSD uses a generic file system genfs to do return the sometimes-wrong EOPNOTSUPP more consistently :-)(. Found by: NIST-PCTS
898 lines
21 KiB
C
898 lines
21 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)spec_vnops.c 8.6 (Berkeley) 4/9/94
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* $Id: spec_vnops.c,v 1.33 1996/10/06 21:19:33 dyson Exp $
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*/
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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/unistd.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/fcntl.h>
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#include <sys/disklabel.h>
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#include <sys/vmmeter.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/vnode_pager.h>
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#include <vm/vm_extern.h>
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#include <miscfs/specfs/specdev.h>
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static int spec_ebadf __P((void));
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static int spec_getattr __P((struct vop_getattr_args *));
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struct vnode *speclisth[SPECHSZ];
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vop_t **spec_vnodeop_p;
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static struct vnodeopv_entry_desc spec_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *)vn_default_error },
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{ &vop_lookup_desc, (vop_t *)spec_lookup }, /* lookup */
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{ &vop_create_desc, (vop_t *)spec_create }, /* create */
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{ &vop_mknod_desc, (vop_t *)spec_mknod }, /* mknod */
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{ &vop_open_desc, (vop_t *)spec_open }, /* open */
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{ &vop_close_desc, (vop_t *)spec_close }, /* close */
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{ &vop_access_desc, (vop_t *)spec_access }, /* access */
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{ &vop_getattr_desc, (vop_t *)spec_getattr }, /* getattr */
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{ &vop_setattr_desc, (vop_t *)spec_setattr }, /* setattr */
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{ &vop_read_desc, (vop_t *)spec_read }, /* read */
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{ &vop_write_desc, (vop_t *)spec_write }, /* write */
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{ &vop_ioctl_desc, (vop_t *)spec_ioctl }, /* ioctl */
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{ &vop_select_desc, (vop_t *)spec_select }, /* select */
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{ &vop_mmap_desc, (vop_t *)spec_mmap }, /* mmap */
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{ &vop_fsync_desc, (vop_t *)spec_fsync }, /* fsync */
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{ &vop_seek_desc, (vop_t *)spec_seek }, /* seek */
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{ &vop_remove_desc, (vop_t *)spec_remove }, /* remove */
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{ &vop_link_desc, (vop_t *)spec_link }, /* link */
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{ &vop_rename_desc, (vop_t *)spec_rename }, /* rename */
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{ &vop_mkdir_desc, (vop_t *)spec_mkdir }, /* mkdir */
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{ &vop_rmdir_desc, (vop_t *)spec_rmdir }, /* rmdir */
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{ &vop_symlink_desc, (vop_t *)spec_symlink }, /* symlink */
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{ &vop_readdir_desc, (vop_t *)spec_readdir }, /* readdir */
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{ &vop_readlink_desc, (vop_t *)spec_readlink }, /* readlink */
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{ &vop_abortop_desc, (vop_t *)spec_abortop }, /* abortop */
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{ &vop_inactive_desc, (vop_t *)spec_inactive }, /* inactive */
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{ &vop_reclaim_desc, (vop_t *)spec_reclaim }, /* reclaim */
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{ &vop_lock_desc, (vop_t *)spec_lock }, /* lock */
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{ &vop_unlock_desc, (vop_t *)spec_unlock }, /* unlock */
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{ &vop_bmap_desc, (vop_t *)spec_bmap }, /* bmap */
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{ &vop_strategy_desc, (vop_t *)spec_strategy }, /* strategy */
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{ &vop_print_desc, (vop_t *)spec_print }, /* print */
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{ &vop_islocked_desc, (vop_t *)spec_islocked }, /* islocked */
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{ &vop_pathconf_desc, (vop_t *)spec_pathconf }, /* pathconf */
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{ &vop_advlock_desc, (vop_t *)spec_advlock }, /* advlock */
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{ &vop_blkatoff_desc, (vop_t *)spec_blkatoff }, /* blkatoff */
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{ &vop_valloc_desc, (vop_t *)spec_valloc }, /* valloc */
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{ &vop_vfree_desc, (vop_t *)spec_vfree }, /* vfree */
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{ &vop_truncate_desc, (vop_t *)spec_truncate }, /* truncate */
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{ &vop_update_desc, (vop_t *)spec_update }, /* update */
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{ &vop_bwrite_desc, (vop_t *)vn_bwrite }, /* bwrite */
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{ &vop_getpages_desc, (vop_t *)spec_getpages}, /* getpages */
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{ NULL, NULL }
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};
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static struct vnodeopv_desc spec_vnodeop_opv_desc =
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{ &spec_vnodeop_p, spec_vnodeop_entries };
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VNODEOP_SET(spec_vnodeop_opv_desc);
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static void spec_getpages_iodone __P((struct buf *bp));
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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(ap)
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struct vop_lookup_args /* {
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struct vnode *a_dvp;
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struct vnode **a_vpp;
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struct componentname *a_cnp;
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} */ *ap;
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{
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*ap->a_vpp = NULL;
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return (ENOTDIR);
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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(ap)
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struct vop_open_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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struct vnode *bvp, *vp = ap->a_vp;
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dev_t bdev, dev = (dev_t)vp->v_rdev;
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register int maj = major(dev);
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int error;
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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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if ((u_int)maj >= nchrdev)
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return (ENXIO);
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if ( (cdevsw[maj] == NULL) || (cdevsw[maj]->d_open == 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 && isdisk(dev, VCHR))
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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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if ((bdev = chrtoblk(dev)) != NODEV &&
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vfinddev(bdev, VBLK, &bvp) &&
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bvp->v_usecount > 0 &&
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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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VOP_UNLOCK(vp);
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error = (*cdevsw[maj]->d_open)(dev, ap->a_mode, S_IFCHR, ap->a_p);
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VOP_LOCK(vp);
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return (error);
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case VBLK:
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if ((u_int)maj >= nblkdev)
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return (ENXIO);
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if ( (bdevsw[maj] == NULL) || (bdevsw[maj]->d_open == 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) && isdisk(dev, VBLK))
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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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error = vfs_mountedon(vp);
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if (error)
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return (error);
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return ((*bdevsw[maj]->d_open)(dev, ap->a_mode, S_IFBLK, ap->a_p));
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default:
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break;
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}
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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(ap)
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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;
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{
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register struct vnode *vp = ap->a_vp;
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register 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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daddr_t bn, nextbn;
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long bsize, bscale;
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struct partinfo dpart;
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int n, on, majordev;
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d_ioctl_t *ioctl;
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int error = 0;
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dev_t dev;
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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);
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error = (*cdevsw[major(vp->v_rdev)]->d_read)
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(vp->v_rdev, uio, ap->a_ioflag);
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VOP_LOCK(vp);
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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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dev = vp->v_rdev;
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if ((majordev = major(dev)) < nblkdev &&
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(ioctl = bdevsw[majordev]->d_ioctl) != NULL &&
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(*ioctl)(dev, DIOCGPART, (caddr_t)&dpart, FREAD, p) == 0 &&
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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 * dpart.part->p_fsize;
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bscale = btodb(bsize);
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do {
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bn = btodb(uio->uio_offset) & ~(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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if (vp->v_lastr + bscale == bn) {
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nextbn = bn + bscale;
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error = breadn(vp, bn, (int)bsize, &nextbn,
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(int *)&bsize, 1, NOCRED, &bp);
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} else
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error = bread(vp, bn, (int)bsize, NOCRED, &bp);
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vp->v_lastr = bn;
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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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* Vnode op for write
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*/
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/* ARGSUSED */
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int
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spec_write(ap)
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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;
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{
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register struct vnode *vp = ap->a_vp;
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register 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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daddr_t bn;
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int bsize, blkmask;
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struct partinfo dpart;
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register 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");
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#endif
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switch (vp->v_type) {
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case VCHR:
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VOP_UNLOCK(vp);
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error = (*cdevsw[major(vp->v_rdev)]->d_write)
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(vp->v_rdev, uio, ap->a_ioflag);
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VOP_LOCK(vp);
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return (error);
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case VBLK:
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if (uio->uio_resid == 0)
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return (0);
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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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if ((*bdevsw[major(vp->v_rdev)]->d_ioctl)(vp->v_rdev, DIOCGPART,
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(caddr_t)&dpart, 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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blkmask = btodb(bsize) - 1;
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do {
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bn = btodb(uio->uio_offset) & ~blkmask;
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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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if (n == bsize)
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bp = getblk(vp, bn, bsize, 0, 0);
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else
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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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if (n + on == bsize) {
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/* bawrite(bp); */
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cluster_write(bp, 0);
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} else
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bdwrite(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_write type");
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}
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/* NOTREACHED */
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}
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/*
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* Device ioctl operation.
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*/
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/* ARGSUSED */
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int
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spec_ioctl(ap)
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struct vop_ioctl_args /* {
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struct vnode *a_vp;
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int a_command;
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caddr_t a_data;
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int a_fflag;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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dev_t dev = ap->a_vp->v_rdev;
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switch (ap->a_vp->v_type) {
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case VCHR:
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return ((*cdevsw[major(dev)]->d_ioctl)(dev, ap->a_command, ap->a_data,
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ap->a_fflag, ap->a_p));
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case VBLK:
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if (ap->a_command == 0 && (int)ap->a_data == B_TAPE)
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if (bdevsw[major(dev)]->d_flags & B_TAPE)
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return (0);
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else
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return (1);
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return ((*bdevsw[major(dev)]->d_ioctl)(dev, ap->a_command, ap->a_data,
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ap->a_fflag, ap->a_p));
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default:
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panic("spec_ioctl");
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/* NOTREACHED */
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}
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}
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/* ARGSUSED */
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int
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spec_select(ap)
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struct vop_select_args /* {
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struct vnode *a_vp;
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int a_which;
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int a_fflags;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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register dev_t dev;
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switch (ap->a_vp->v_type) {
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default:
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return (1); /* XXX */
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case VCHR:
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dev = ap->a_vp->v_rdev;
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return (*cdevsw[major(dev)]->d_select)(dev, ap->a_which, ap->a_p);
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}
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}
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/*
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* Synch buffers associated with a block device
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*/
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/* ARGSUSED */
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int
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spec_fsync(ap)
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struct vop_fsync_args /* {
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struct vnode *a_vp;
|
|
struct ucred *a_cred;
|
|
int a_waitfor;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
register struct vnode *vp = ap->a_vp;
|
|
register struct buf *bp;
|
|
struct buf *nbp;
|
|
int s;
|
|
|
|
if (vp->v_type == VCHR)
|
|
return (0);
|
|
/*
|
|
* Flush all dirty buffers associated with a block device.
|
|
*/
|
|
loop:
|
|
s = splbio();
|
|
for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = nbp) {
|
|
nbp = bp->b_vnbufs.le_next;
|
|
if ((bp->b_flags & B_BUSY))
|
|
continue;
|
|
if ((bp->b_flags & B_DELWRI) == 0)
|
|
panic("spec_fsync: not dirty");
|
|
bremfree(bp);
|
|
bp->b_flags |= B_BUSY;
|
|
splx(s);
|
|
bawrite(bp);
|
|
goto loop;
|
|
}
|
|
if (ap->a_waitfor == MNT_WAIT) {
|
|
while (vp->v_numoutput) {
|
|
vp->v_flag |= VBWAIT;
|
|
(void) tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "spfsyn", 0);
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
if (vp->v_dirtyblkhd.lh_first) {
|
|
vprint("spec_fsync: dirty", vp);
|
|
splx(s);
|
|
goto loop;
|
|
}
|
|
#endif
|
|
}
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Just call the device strategy routine
|
|
*/
|
|
int
|
|
spec_strategy(ap)
|
|
struct vop_strategy_args /* {
|
|
struct buf *a_bp;
|
|
} */ *ap;
|
|
{
|
|
|
|
(*bdevsw[major(ap->a_bp->b_dev)]->d_strategy)(ap->a_bp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This is a noop, simply returning what one has been given.
|
|
*/
|
|
int
|
|
spec_bmap(ap)
|
|
struct vop_bmap_args /* {
|
|
struct vnode *a_vp;
|
|
daddr_t a_bn;
|
|
struct vnode **a_vpp;
|
|
daddr_t *a_bnp;
|
|
int *a_runp;
|
|
int *a_runb;
|
|
} */ *ap;
|
|
{
|
|
|
|
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 = 0;
|
|
if (ap->a_runb != NULL)
|
|
*ap->a_runb = 0;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* At the moment we do not do any locking.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_lock(ap)
|
|
struct vop_lock_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
spec_unlock(ap)
|
|
struct vop_unlock_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Device close routine
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_close(ap)
|
|
struct vop_close_args /* {
|
|
struct vnode *a_vp;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
register struct vnode *vp = ap->a_vp;
|
|
dev_t dev = vp->v_rdev;
|
|
d_close_t *devclose;
|
|
int mode, error;
|
|
|
|
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 (vcount(vp) == 2 && ap->a_p &&
|
|
vp == ap->a_p->p_session->s_ttyvp) {
|
|
vrele(vp);
|
|
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 (vcount(vp) > 1 && (vp->v_flag & VXLOCK) == 0)
|
|
return (0);
|
|
devclose = cdevsw[major(dev)]->d_close;
|
|
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 ((vcount(vp) > (vp->v_object?2:1)) &&
|
|
(vp->v_flag & VXLOCK) == 0)
|
|
return (0);
|
|
|
|
if (vp->v_object)
|
|
vnode_pager_uncache(vp);
|
|
|
|
devclose = bdevsw[major(dev)]->d_close;
|
|
mode = S_IFBLK;
|
|
break;
|
|
|
|
default:
|
|
panic("spec_close: not special");
|
|
}
|
|
|
|
return ((*devclose)(dev, ap->a_fflag, mode, ap->a_p));
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a special device vnode.
|
|
*/
|
|
int
|
|
spec_print(ap)
|
|
struct vop_print_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
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(ap)
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
int *a_retval;
|
|
} */ *ap;
|
|
{
|
|
|
|
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);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Special device advisory byte-level locks.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_advlock(ap)
|
|
struct vop_advlock_args /* {
|
|
struct vnode *a_vp;
|
|
caddr_t a_id;
|
|
int a_op;
|
|
struct flock *a_fl;
|
|
int a_flags;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Special device failed operation
|
|
*/
|
|
static int
|
|
spec_ebadf()
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
/*
|
|
* Special device bad operation
|
|
*/
|
|
int
|
|
spec_badop()
|
|
{
|
|
|
|
panic("spec_badop called");
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void
|
|
spec_getpages_iodone(bp)
|
|
struct buf *bp;
|
|
{
|
|
|
|
bp->b_flags |= B_DONE;
|
|
wakeup(bp);
|
|
}
|
|
|
|
int
|
|
spec_getpages(ap)
|
|
struct vop_getpages_args *ap;
|
|
{
|
|
vm_offset_t kva;
|
|
int error;
|
|
int i, pcount, size, s;
|
|
daddr_t blkno;
|
|
struct buf *bp;
|
|
vm_ooffset_t offset;
|
|
|
|
error = 0;
|
|
pcount = round_page(ap->a_count) / PAGE_SIZE;
|
|
|
|
/*
|
|
* Calculate the offset of the transfer.
|
|
*/
|
|
offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset;
|
|
|
|
/* XXX sanity check before we go into details. */
|
|
/* XXX limits should be defined elsewhere. */
|
|
#define DADDR_T_BIT 32
|
|
#define OFFSET_MAX ((1LL << (DADDR_T_BIT + DEV_BSHIFT)) - 1)
|
|
if (offset < 0 || offset > OFFSET_MAX) {
|
|
/* XXX still no %q in kernel. */
|
|
printf("spec_getpages: preposterous offset 0x%x%08x\n",
|
|
(u_int)((u_quad_t)offset >> 32),
|
|
(u_int)(offset & 0xffffffff));
|
|
return (VM_PAGER_ERROR);
|
|
}
|
|
|
|
blkno = btodb(offset);
|
|
|
|
/*
|
|
* Round up physical size for real devices.
|
|
*/
|
|
size = (ap->a_count + DEV_BSIZE - 1) & ~(DEV_BSIZE - 1);
|
|
|
|
bp = getpbuf();
|
|
kva = (vm_offset_t)bp->b_data;
|
|
|
|
/*
|
|
* Map the pages to be read into the kva.
|
|
*/
|
|
pmap_qenter(kva, ap->a_m, pcount);
|
|
|
|
/* Build a minimal buffer header. */
|
|
bp->b_flags = B_BUSY | B_READ | B_CALL;
|
|
bp->b_iodone = spec_getpages_iodone;
|
|
|
|
/* B_PHYS is not set, but it is nice to fill this in. */
|
|
bp->b_proc = curproc;
|
|
bp->b_rcred = bp->b_wcred = bp->b_proc->p_ucred;
|
|
if (bp->b_rcred != NOCRED)
|
|
crhold(bp->b_rcred);
|
|
if (bp->b_wcred != NOCRED)
|
|
crhold(bp->b_wcred);
|
|
bp->b_blkno = blkno;
|
|
bp->b_lblkno = blkno;
|
|
pbgetvp(ap->a_vp, bp);
|
|
bp->b_bcount = size;
|
|
bp->b_bufsize = size;
|
|
|
|
cnt.v_vnodein++;
|
|
cnt.v_vnodepgsin += pcount;
|
|
|
|
/* Do the input. */
|
|
VOP_STRATEGY(bp);
|
|
if (bp->b_flags & B_ASYNC)
|
|
return (VM_PAGER_PEND);
|
|
|
|
s = splbio();
|
|
|
|
/* We definitely need to be at splbio here. */
|
|
while ((bp->b_flags & B_DONE) == 0)
|
|
tsleep(bp, PVM, "vnread", 0);
|
|
|
|
splx(s);
|
|
|
|
if ((bp->b_flags & B_ERROR) != 0)
|
|
error = EIO;
|
|
|
|
if (!error && ap->a_count != pcount * PAGE_SIZE)
|
|
bzero((caddr_t)kva + ap->a_count,
|
|
PAGE_SIZE * pcount - ap->a_count);
|
|
pmap_qremove(kva, pcount);
|
|
|
|
/*
|
|
* Free the buffer header back to the swap buffer pool.
|
|
*/
|
|
relpbuf(bp);
|
|
|
|
for (i = 0; i < pcount; i++) {
|
|
ap->a_m[i]->dirty = 0;
|
|
ap->a_m[i]->valid = VM_PAGE_BITS_ALL;
|
|
ap->a_m[i]->flags &= ~PG_ZERO;
|
|
if (i != ap->a_reqpage) {
|
|
/*
|
|
* Whether or not to leave the page activated is up in
|
|
* the air, but we should put the page on a page queue
|
|
* somewhere (it already is in the object). Result:
|
|
* It appears that emperical results show that
|
|
* deactivating pages is best.
|
|
*/
|
|
|
|
/*
|
|
* Just in case someone was asking for this page we
|
|
* now tell them that it is ok to use.
|
|
*/
|
|
if (!error) {
|
|
vm_page_deactivate(ap->a_m[i]);
|
|
PAGE_WAKEUP(ap->a_m[i]);
|
|
} else
|
|
vnode_pager_freepage(ap->a_m[i]);
|
|
}
|
|
}
|
|
if (error)
|
|
printf("spec_getpages: I/O read error\n");
|
|
return (error ? VM_PAGER_ERROR : VM_PAGER_OK);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
spec_getattr(ap)
|
|
struct vop_getattr_args /* {
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
register struct vnode *vp = ap->a_vp;
|
|
register struct vattr *vap = ap->a_vap;
|
|
struct partinfo dpart;
|
|
|
|
bzero(vap, sizeof (*vap));
|
|
|
|
if (vp->v_type == VBLK)
|
|
vap->va_blocksize = BLKDEV_IOSIZE;
|
|
else if (vp->v_type == VCHR)
|
|
vap->va_blocksize = MAXBSIZE;
|
|
|
|
if ((*bdevsw[major(vp->v_rdev)]->d_ioctl)(vp->v_rdev, DIOCGPART,
|
|
(caddr_t)&dpart, FREAD, ap->a_p) == 0) {
|
|
vap->va_bytes = dbtob(dpart.disklab->d_partitions
|
|
[minor(vp->v_rdev)].p_size);
|
|
vap->va_size = vap->va_bytes;
|
|
}
|
|
return (0);
|
|
}
|