938 lines
22 KiB
C
938 lines
22 KiB
C
/*
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* Copyright (c) 1989, 1993, 1995
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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 8.14 (Berkeley) 5/21/95
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* $Id: spec_vnops.c,v 1.73 1998/09/05 14:13:12 phk 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/vnode.h>
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#include <sys/stat.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_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_advlock __P((struct vop_advlock_args *));
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static int spec_badop __P((void));
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static int spec_bmap __P((struct vop_bmap_args *));
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static int spec_close __P((struct vop_close_args *));
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static int spec_freeblks __P((struct vop_freeblks_args *));
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static int spec_fsync __P((struct vop_fsync_args *));
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static int spec_getattr __P((struct vop_getattr_args *));
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static int spec_getpages __P((struct vop_getpages_args *));
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static int spec_inactive __P((struct vop_inactive_args *));
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static int spec_ioctl __P((struct vop_ioctl_args *));
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static int spec_lookup __P((struct vop_lookup_args *));
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static int spec_open __P((struct vop_open_args *));
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static int spec_poll __P((struct vop_poll_args *));
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static int spec_print __P((struct vop_print_args *));
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static int spec_read __P((struct vop_read_args *));
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static int spec_strategy __P((struct vop_strategy_args *));
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static int spec_write __P((struct vop_write_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 *) vop_defaultop },
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{ &vop_access_desc, (vop_t *) vop_ebadf },
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{ &vop_advlock_desc, (vop_t *) spec_advlock },
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{ &vop_bmap_desc, (vop_t *) spec_bmap },
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{ &vop_close_desc, (vop_t *) spec_close },
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{ &vop_create_desc, (vop_t *) spec_badop },
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{ &vop_freeblks_desc, (vop_t *) spec_freeblks },
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{ &vop_fsync_desc, (vop_t *) spec_fsync },
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{ &vop_getattr_desc, (vop_t *) spec_getattr },
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{ &vop_getpages_desc, (vop_t *) spec_getpages },
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{ &vop_inactive_desc, (vop_t *) spec_inactive },
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{ &vop_ioctl_desc, (vop_t *) spec_ioctl },
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{ &vop_lease_desc, (vop_t *) vop_null },
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{ &vop_link_desc, (vop_t *) spec_badop },
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{ &vop_lookup_desc, (vop_t *) spec_lookup },
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{ &vop_mkdir_desc, (vop_t *) spec_badop },
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{ &vop_mknod_desc, (vop_t *) spec_badop },
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{ &vop_open_desc, (vop_t *) spec_open },
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{ &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
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{ &vop_poll_desc, (vop_t *) spec_poll },
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{ &vop_print_desc, (vop_t *) spec_print },
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{ &vop_read_desc, (vop_t *) spec_read },
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{ &vop_readdir_desc, (vop_t *) spec_badop },
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{ &vop_readlink_desc, (vop_t *) spec_badop },
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{ &vop_reallocblks_desc, (vop_t *) spec_badop },
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{ &vop_reclaim_desc, (vop_t *) vop_null },
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{ &vop_remove_desc, (vop_t *) spec_badop },
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{ &vop_rename_desc, (vop_t *) spec_badop },
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{ &vop_rmdir_desc, (vop_t *) spec_badop },
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{ &vop_setattr_desc, (vop_t *) vop_ebadf },
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{ &vop_strategy_desc, (vop_t *) spec_strategy },
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{ &vop_symlink_desc, (vop_t *) spec_badop },
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{ &vop_write_desc, (vop_t *) spec_write },
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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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int
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spec_vnoperate(ap)
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struct vop_generic_args /* {
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struct vnodeop_desc *a_desc;
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<other random data follows, presumably>
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} */ *ap;
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{
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return (VOCALL(spec_vnodeop_p, ap->a_desc->vdesc_offset, ap));
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}
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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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static 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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static 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 proc *p = ap->a_p;
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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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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
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&& cdevsw[maj]->d_bmaj != -1
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&& (cdevsw[maj]->d_flags & D_TYPEMASK) == 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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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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if ((cdevsw[maj]->d_flags & D_TYPEMASK) == D_TTY)
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vp->v_flag |= VISTTY;
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VOP_UNLOCK(vp, 0, p);
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error = (*cdevsw[maj]->d_open)(dev, ap->a_mode, S_IFCHR, p);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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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) &&
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(bdevsw[maj]->d_flags & D_TYPEMASK) == 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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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, p));
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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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static 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, 0, p);
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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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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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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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static 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, 0, p);
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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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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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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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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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/*
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* Device ioctl operation.
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*/
|
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/* ARGSUSED */
|
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static 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;
|
|
} */ *ap;
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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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|
|
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case VCHR:
|
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return ((*cdevsw[major(dev)]->d_ioctl)(dev, ap->a_command,
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ap->a_data, ap->a_fflag, ap->a_p));
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case VBLK:
|
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return ((*bdevsw[major(dev)]->d_ioctl)(dev, ap->a_command,
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ap->a_data, 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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|
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/* ARGSUSED */
|
|
static int
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spec_poll(ap)
|
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struct vop_poll_args /* {
|
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struct vnode *a_vp;
|
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int a_events;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
register dev_t dev;
|
|
|
|
switch (ap->a_vp->v_type) {
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|
|
|
case VCHR:
|
|
dev = ap->a_vp->v_rdev;
|
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return (*cdevsw[major(dev)]->d_poll)(dev, ap->a_events, ap->a_p);
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|
default:
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return (vop_defaultop((struct vop_generic_args *)ap));
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|
|
|
}
|
|
}
|
|
/*
|
|
* Synch buffers associated with a block device
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
spec_fsync(ap)
|
|
struct vop_fsync_args /* {
|
|
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");
|
|
if ((vp->v_flag & VOBJBUF) && (bp->b_flags & B_CLUSTEROK)) {
|
|
vfs_bio_awrite(bp);
|
|
splx(s);
|
|
} else {
|
|
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);
|
|
}
|
|
|
|
static int
|
|
spec_inactive(ap)
|
|
struct vop_inactive_args /* {
|
|
struct vnode *a_vp;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
|
|
VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Just call the device strategy routine
|
|
*/
|
|
static int
|
|
spec_strategy(ap)
|
|
struct vop_strategy_args /* {
|
|
struct buf *a_bp;
|
|
} */ *ap;
|
|
{
|
|
struct buf *bp;
|
|
|
|
bp = ap->a_bp;
|
|
if (((bp->b_flags & B_READ) == 0) &&
|
|
(LIST_FIRST(&bp->b_dep)) != NULL && bioops.io_start)
|
|
(*bioops.io_start)(bp);
|
|
(*bdevsw[major(bp->b_dev)]->d_strategy)(bp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
spec_freeblks(ap)
|
|
struct vop_freeblks_args /* {
|
|
struct vnode *a_vp;
|
|
daddr_t a_addr;
|
|
daddr_t a_length;
|
|
} */ *ap;
|
|
{
|
|
struct cdevsw *bsw;
|
|
struct buf *bp;
|
|
|
|
bsw = bdevsw[major(ap->a_vp->v_rdev)];
|
|
if ((bsw->d_flags & D_CANFREE) == 0)
|
|
return (0);
|
|
bp = geteblk(ap->a_length);
|
|
bp->b_flags |= B_FREEBUF | B_BUSY;
|
|
bp->b_dev = ap->a_vp->v_rdev;
|
|
bp->b_blkno = ap->a_addr;
|
|
bp->b_offset = dbtob(ap->a_addr);
|
|
bp->b_bcount = ap->a_length;
|
|
(*bsw->d_strategy)(bp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This is a noop, simply returning what one has been given.
|
|
*/
|
|
static 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);
|
|
}
|
|
|
|
/*
|
|
* Device close routine
|
|
*/
|
|
/* ARGSUSED */
|
|
static 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;
|
|
struct proc *p = ap->a_p;
|
|
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->v_flag & VXLOCK) == 0 &&
|
|
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.
|
|
*/
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_p);
|
|
error = vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 0, 0);
|
|
VOP_UNLOCK(vp, 0, ap->a_p);
|
|
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) > 1) && (vp->v_flag & VXLOCK) == 0)
|
|
return (0);
|
|
|
|
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.
|
|
*/
|
|
static 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);
|
|
}
|
|
|
|
/*
|
|
* Special device advisory byte-level locks.
|
|
*/
|
|
/* ARGSUSED */
|
|
static 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 bad operation
|
|
*/
|
|
static int
|
|
spec_badop()
|
|
{
|
|
|
|
panic("spec_badop called");
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void
|
|
spec_getpages_iodone(bp)
|
|
struct buf *bp;
|
|
{
|
|
|
|
bp->b_flags |= B_DONE;
|
|
wakeup(bp);
|
|
}
|
|
|
|
static 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_page_t m;
|
|
vm_ooffset_t offset;
|
|
int toff, nextoff, nread;
|
|
struct vnode *vp = ap->a_vp;
|
|
int blksiz;
|
|
int gotreqpage;
|
|
|
|
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, use the
|
|
* fundamental blocksize of the fs if possible.
|
|
*/
|
|
if (vp && vp->v_mount) {
|
|
if (vp->v_type != VBLK) {
|
|
vprint("Non VBLK", vp);
|
|
}
|
|
blksiz = vp->v_mount->mnt_stat.f_bsize;
|
|
if (blksiz < DEV_BSIZE) {
|
|
blksiz = DEV_BSIZE;
|
|
}
|
|
}
|
|
else
|
|
blksiz = DEV_BSIZE;
|
|
size = (ap->a_count + blksiz - 1) & ~(blksiz - 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;
|
|
bp->b_resid = 0;
|
|
|
|
cnt.v_vnodein++;
|
|
cnt.v_vnodepgsin += pcount;
|
|
|
|
/* Do the input. */
|
|
VOP_STRATEGY(bp->b_vp, bp);
|
|
|
|
s = splbio();
|
|
|
|
/* We definitely need to be at splbio here. */
|
|
while ((bp->b_flags & B_DONE) == 0)
|
|
tsleep(bp, PVM, "spread", 0);
|
|
|
|
splx(s);
|
|
|
|
if ((bp->b_flags & B_ERROR) != 0) {
|
|
if (bp->b_error)
|
|
error = bp->b_error;
|
|
else
|
|
error = EIO;
|
|
}
|
|
|
|
nread = size - bp->b_resid;
|
|
|
|
if (nread < ap->a_count) {
|
|
bzero((caddr_t)kva + nread,
|
|
ap->a_count - nread);
|
|
}
|
|
pmap_qremove(kva, pcount);
|
|
|
|
|
|
gotreqpage = 0;
|
|
for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) {
|
|
nextoff = toff + PAGE_SIZE;
|
|
m = ap->a_m[i];
|
|
|
|
m->flags &= ~PG_ZERO;
|
|
|
|
if (nextoff <= nread) {
|
|
m->valid = VM_PAGE_BITS_ALL;
|
|
m->dirty = 0;
|
|
} else if (toff < nread) {
|
|
int nvalid = ((nread + DEV_BSIZE - 1) - toff) & ~(DEV_BSIZE - 1);
|
|
vm_page_set_validclean(m, 0, nvalid);
|
|
} else {
|
|
m->valid = 0;
|
|
m->dirty = 0;
|
|
}
|
|
|
|
if (i != ap->a_reqpage) {
|
|
/*
|
|
* Just in case someone was asking for this page we
|
|
* now tell them that it is ok to use.
|
|
*/
|
|
if (!error || (m->valid == VM_PAGE_BITS_ALL)) {
|
|
if (m->valid) {
|
|
if (m->flags & PG_WANTED) {
|
|
vm_page_activate(m);
|
|
} else {
|
|
vm_page_deactivate(m);
|
|
}
|
|
vm_page_wakeup(m);
|
|
} else {
|
|
vm_page_free(m);
|
|
}
|
|
} else {
|
|
vm_page_free(m);
|
|
}
|
|
} else if (m->valid) {
|
|
gotreqpage = 1;
|
|
}
|
|
}
|
|
if (!gotreqpage) {
|
|
m = ap->a_m[ap->a_reqpage];
|
|
#ifndef MAX_PERF
|
|
printf(
|
|
"spec_getpages: I/O read failure: (error code=%d)\n",
|
|
error);
|
|
printf(
|
|
" size: %d, resid: %ld, a_count: %d, valid: 0x%x\n",
|
|
size, bp->b_resid, ap->a_count, m->valid);
|
|
printf(
|
|
" nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n",
|
|
nread, ap->a_reqpage, (u_long)m->pindex, pcount);
|
|
#endif
|
|
/*
|
|
* Free the buffer header back to the swap buffer pool.
|
|
*/
|
|
relpbuf(bp);
|
|
return VM_PAGER_ERROR;
|
|
}
|
|
/*
|
|
* Free the buffer header back to the swap buffer pool.
|
|
*/
|
|
relpbuf(bp);
|
|
return 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);
|
|
}
|