f7ea2f55d1
There is only cdevsw (which should be renamed in a later edit to deventry or something). cdevsw contains the union of what were in both bdevsw an cdevsw entries. The bdevsw[] table stiff exists and is a second pointer to the cdevsw entry of the device. it's major is in d_bmaj rather than d_maj. some cleanup still to happen (e.g. dsopen now gets two pointers to the same cdevsw struct instead of one to a bdevsw and one to a cdevsw). rawread()/rawwrite() went away as part of this though it's not strictly the same patch, just that it involves all the same lines in the drivers. cdroms no longer have write() entries (they did have rawwrite (?)). tapes no longer have support for bdev operations. Reviewed by: Eivind Eklund and Mike Smith Changes suggested by eivind.
925 lines
22 KiB
C
925 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 1.64 1998/07/04 20:45:33 julian 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_getattr __P((struct vop_getattr_args *));
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static int spec_badop __P((void));
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static int spec_strategy __P((struct vop_strategy_args *));
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static int spec_print __P((struct vop_print_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_close __P((struct vop_close_args *));
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static int spec_read __P((struct vop_read_args *));
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static int spec_write __P((struct vop_write_args *));
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static int spec_ioctl __P((struct vop_ioctl_args *));
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static int spec_poll __P((struct vop_poll_args *));
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static int spec_inactive __P((struct vop_inactive_args *));
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static int spec_fsync __P((struct vop_fsync_args *));
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static int spec_bmap __P((struct vop_bmap_args *));
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static int spec_advlock __P((struct vop_advlock_args *));
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static int spec_getpages __P((struct vop_getpages_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_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 0
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/*
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* Lite2 stuff. We will almost certainly do this
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* differently with devfs. The only use of this flag
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* is in dead_read to make ttys return EOF instead of
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* EIO when they are dead. Pre-lite2 FreeBSD returns
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* EOF for all character devices.
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*/
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if (cdevsw[maj]->d_type == D_TTY)
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vp->v_flag |= VISTTY;
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#endif
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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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* 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;
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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 && (long)ap->a_data == B_TAPE)
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if ((bdevsw[major(dev)]->d_flags & D_TYPEMASK) ==
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D_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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static int
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spec_poll(ap)
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
register dev_t dev;
|
|
|
|
switch (ap->a_vp->v_type) {
|
|
|
|
case VCHR:
|
|
dev = ap->a_vp->v_rdev;
|
|
return (*cdevsw[major(dev)]->d_poll)(dev, ap->a_events, ap->a_p);
|
|
default:
|
|
return (vop_defaultop((struct vop_generic_args *)ap));
|
|
|
|
}
|
|
}
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
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: %d, a_count: %d, valid: 0x%x\n",
|
|
size, bp->b_resid, ap->a_count, m->valid);
|
|
printf(" nread: %d, reqpage: %d, pindex: %d, pcount: %d\n",
|
|
nread, ap->a_reqpage, 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);
|
|
}
|